var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function getDefaultExportFromCjs (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

function getAugmentedNamespace(n) {
  var f = n.default;
	if (typeof f == "function") {
		var a = function () {
			return f.apply(this, arguments);
		};
		a.prototype = f.prototype;
  } else a = {};
  Object.defineProperty(a, '__esModule', {value: true});
	Object.keys(n).forEach(function (k) {
		var d = Object.getOwnPropertyDescriptor(n, k);
		Object.defineProperty(a, k, d.get ? d : {
			enumerable: true,
			get: function () {
				return n[k];
			}
		});
	});
	return a;
}

var cleanCss = {exports: {}};

var global$1 = (typeof global !== "undefined" ? global :
  typeof self !== "undefined" ? self :
  typeof window !== "undefined" ? window : {});

// shim for using process in browser
// based off https://github.com/defunctzombie/node-process/blob/master/browser.js

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
var cachedSetTimeout = defaultSetTimout;
var cachedClearTimeout = defaultClearTimeout;
if (typeof global$1.setTimeout === 'function') {
    cachedSetTimeout = setTimeout;
}
if (typeof global$1.clearTimeout === 'function') {
    cachedClearTimeout = clearTimeout;
}

function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}
function nextTick(fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
}
// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
var title = 'browser';
var platform$1 = 'browser';
var browser = true;
var env = {};
var argv = [];
var version = ''; // empty string to avoid regexp issues
var versions = {};
var release$1 = {};
var config = {};

function noop$2() {}

var on = noop$2;
var addListener = noop$2;
var once = noop$2;
var off = noop$2;
var removeListener = noop$2;
var removeAllListeners = noop$2;
var emit = noop$2;

function binding(name) {
    throw new Error('process.binding is not supported');
}

function cwd () { return '/' }
function chdir (dir) {
    throw new Error('process.chdir is not supported');
}function umask() { return 0; }

// from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js
var performance = global$1.performance || {};
var performanceNow =
  performance.now        ||
  performance.mozNow     ||
  performance.msNow      ||
  performance.oNow       ||
  performance.webkitNow  ||
  function(){ return (new Date()).getTime() };

// generate timestamp or delta
// see http://nodejs.org/api/process.html#process_process_hrtime
function hrtime(previousTimestamp){
  var clocktime = performanceNow.call(performance)*1e-3;
  var seconds = Math.floor(clocktime);
  var nanoseconds = Math.floor((clocktime%1)*1e9);
  if (previousTimestamp) {
    seconds = seconds - previousTimestamp[0];
    nanoseconds = nanoseconds - previousTimestamp[1];
    if (nanoseconds<0) {
      seconds--;
      nanoseconds += 1e9;
    }
  }
  return [seconds,nanoseconds]
}

var startTime = new Date();
function uptime$1() {
  var currentTime = new Date();
  var dif = currentTime - startTime;
  return dif / 1000;
}

var browser$1 = {
  nextTick: nextTick,
  title: title,
  browser: browser,
  env: env,
  argv: argv,
  version: version,
  versions: versions,
  on: on,
  addListener: addListener,
  once: once,
  off: off,
  removeListener: removeListener,
  removeAllListeners: removeAllListeners,
  emit: emit,
  binding: binding,
  cwd: cwd,
  chdir: chdir,
  umask: umask,
  hrtime: hrtime,
  platform: platform$1,
  release: release$1,
  config: config,
  uptime: uptime$1
};

var clean$1 = {exports: {}};

function level0Optimize$1(tokens) {
  // noop as level 0 means no optimizations!
  return tokens;
}

var optimize$4 = level0Optimize$1;

// adapted from http://nedbatchelder.com/blog/200712.html#e20071211T054956

var NUMBER_PATTERN = /([0-9]+)/;

function naturalCompare$1(value1, value2) {
  var keys1 = ('' + value1).split(NUMBER_PATTERN).map(tryParseInt);
  var keys2 = ('' + value2).split(NUMBER_PATTERN).map(tryParseInt);
  var key1;
  var key2;
  var compareFirst = Math.min(keys1.length, keys2.length);
  var i, l;

  for (i = 0, l = compareFirst; i < l; i++) {
    key1 = keys1[i];
    key2 = keys2[i];

    if (key1 != key2) {
      return key1 > key2 ? 1 : -1;
    }
  }

  return keys1.length > keys2.length ? 1 : (keys1.length == keys2.length ? 0 : -1);
}

function tryParseInt(value) {
  return ('' + parseInt(value)) == value ?
    parseInt(value) :
    value;
}

var naturalCompare_1 = naturalCompare$1;

var naturalCompare = naturalCompare_1;

function naturalSorter$1(scope1, scope2) {
  return naturalCompare(scope1[1], scope2[1]);
}

function standardSorter(scope1, scope2) {
  return scope1[1] > scope2[1] ? 1 : -1;
}

function sortSelectors$3(selectors, method) {
  switch (method) {
    case 'natural':
      return selectors.sort(naturalSorter$1);
    case 'standard':
      return selectors.sort(standardSorter);
    case 'none':
    case false:
      return selectors;
  }
}

var sortSelectors_1 = sortSelectors$3;

/*
The MIT License (MIT)

Copyright (c) 2016 CoderPuppy

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/
var _endianness;
function endianness() {
  if (typeof _endianness === 'undefined') {
    var a = new ArrayBuffer(2);
    var b = new Uint8Array(a);
    var c = new Uint16Array(a);
    b[0] = 1;
    b[1] = 2;
    if (c[0] === 258) {
      _endianness = 'BE';
    } else if (c[0] === 513){
      _endianness = 'LE';
    } else {
      throw new Error('unable to figure out endianess');
    }
  }
  return _endianness;
}

function hostname() {
  if (typeof global$1.location !== 'undefined') {
    return global$1.location.hostname
  } else return '';
}

function loadavg() {
  return [];
}

function uptime() {
  return 0;
}

function freemem() {
  return Number.MAX_VALUE;
}

function totalmem() {
  return Number.MAX_VALUE;
}

function cpus() {
  return [];
}

function type() {
  return 'Browser';
}

function release () {
  if (typeof global$1.navigator !== 'undefined') {
    return global$1.navigator.appVersion;
  }
  return '';
}

function networkInterfaces () {
  return {};
}

function getNetworkInterfaces () {
  return {};
}

function arch() {
  return 'javascript';
}

function platform() {
  return 'browser';
}

function tmpDir() {
  return '/tmp';
}
var tmpdir = tmpDir;

var EOL = '\n';

function homedir(){
  return '$HOME'
}

var _polyfillNode_os = {
  homedir: homedir,
  EOL: EOL,
  arch: arch,
  platform: platform,
  tmpdir: tmpdir,
  tmpDir: tmpDir,
  networkInterfaces:networkInterfaces,
  getNetworkInterfaces: getNetworkInterfaces,
  release: release,
  type: type,
  cpus: cpus,
  totalmem: totalmem,
  freemem: freemem,
  uptime: uptime,
  loadavg: loadavg,
  hostname: hostname,
  endianness: endianness,
};

var _polyfillNode_os$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	endianness: endianness,
	hostname: hostname,
	loadavg: loadavg,
	uptime: uptime,
	freemem: freemem,
	totalmem: totalmem,
	cpus: cpus,
	type: type,
	release: release,
	networkInterfaces: networkInterfaces,
	getNetworkInterfaces: getNetworkInterfaces,
	arch: arch,
	platform: platform,
	tmpDir: tmpDir,
	tmpdir: tmpdir,
	EOL: EOL,
	homedir: homedir,
	default: _polyfillNode_os
});

var require$$0$3 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_os$1);

function override$7(source1, source2) {
  var target = {};
  var key1;
  var key2;
  var item;

  for (key1 in source1) {
    item = source1[key1];

    if (Array.isArray(item)) {
      target[key1] = item.slice(0);
    } else if (typeof item == 'object' && item !== null) {
      target[key1] = override$7(item, {});
    } else {
      target[key1] = item;
    }
  }

  for (key2 in source2) {
    item = source2[key2];

    if (key2 in target && Array.isArray(item)) {
      target[key2] = item.slice(0);
    } else if (key2 in target && typeof item == 'object' && item !== null) {
      target[key2] = override$7(target[key2], item);
    } else {
      target[key2] = item;
    }
  }

  return target;
}

var override_1 = override$7;

var systemLineBreak = require$$0$3.EOL;

var override$6 = override_1;

var Breaks$1 = {
  AfterAtRule: 'afterAtRule',
  AfterBlockBegins: 'afterBlockBegins',
  AfterBlockEnds: 'afterBlockEnds',
  AfterComment: 'afterComment',
  AfterProperty: 'afterProperty',
  AfterRuleBegins: 'afterRuleBegins',
  AfterRuleEnds: 'afterRuleEnds',
  BeforeBlockEnds: 'beforeBlockEnds',
  BetweenSelectors: 'betweenSelectors'
};

var BreakWith = {
  CarriageReturnLineFeed: '\r\n',
  LineFeed: '\n',
  System: systemLineBreak
};

var IndentWith = {
  Space: ' ',
  Tab: '\t'
};

var Spaces$2 = {
  AroundSelectorRelation: 'aroundSelectorRelation',
  BeforeBlockBegins: 'beforeBlockBegins',
  BeforeValue: 'beforeValue'
};

var DEFAULTS$2 = {
  breaks: breaks(false),
  breakWith: BreakWith.System,
  indentBy: 0,
  indentWith: IndentWith.Space,
  spaces: spaces(false),
  wrapAt: false,
  semicolonAfterLastProperty: false
};

var BEAUTIFY_ALIAS = 'beautify';
var KEEP_BREAKS_ALIAS = 'keep-breaks';

var OPTION_SEPARATOR$1 = ';';
var OPTION_NAME_VALUE_SEPARATOR = ':';
var HASH_VALUES_OPTION_SEPARATOR = ',';
var HASH_VALUES_NAME_VALUE_SEPARATOR = '=';

var FALSE_KEYWORD_1$1 = 'false';
var FALSE_KEYWORD_2$1 = 'off';
var TRUE_KEYWORD_1$1 = 'true';
var TRUE_KEYWORD_2$1 = 'on';

function breaks(value) {
  var breakOptions = {};

  breakOptions[Breaks$1.AfterAtRule] = value;
  breakOptions[Breaks$1.AfterBlockBegins] = value;
  breakOptions[Breaks$1.AfterBlockEnds] = value;
  breakOptions[Breaks$1.AfterComment] = value;
  breakOptions[Breaks$1.AfterProperty] = value;
  breakOptions[Breaks$1.AfterRuleBegins] = value;
  breakOptions[Breaks$1.AfterRuleEnds] = value;
  breakOptions[Breaks$1.BeforeBlockEnds] = value;
  breakOptions[Breaks$1.BetweenSelectors] = value;

  return breakOptions;
}

function spaces(value) {
  var spaceOptions = {};

  spaceOptions[Spaces$2.AroundSelectorRelation] = value;
  spaceOptions[Spaces$2.BeforeBlockBegins] = value;
  spaceOptions[Spaces$2.BeforeValue] = value;

  return spaceOptions;
}

function formatFrom$1(source) {
  if (source === undefined || source === false) {
    return false;
  }

  if (typeof source == 'object' && 'breakWith' in source) {
    source = override$6(source, { breakWith: mapBreakWith(source.breakWith) });
  }

  if (typeof source == 'object' && 'indentBy' in source) {
    source = override$6(source, { indentBy: parseInt(source.indentBy) });
  }

  if (typeof source == 'object' && 'indentWith' in source) {
    source = override$6(source, { indentWith: mapIndentWith(source.indentWith) });
  }

  if (typeof source == 'object') {
    return remapBreaks(override$6(DEFAULTS$2, source));
  }

  if (typeof source == 'string' && source == BEAUTIFY_ALIAS) {
    return remapBreaks(
      override$6(DEFAULTS$2, {
        breaks: breaks(true),
        indentBy: 2,
        spaces: spaces(true)
      })
    );
  }

  if (typeof source == 'string' && source == KEEP_BREAKS_ALIAS) {
    return remapBreaks(
      override$6(DEFAULTS$2, {
        breaks: {
          afterAtRule: true,
          afterBlockBegins: true,
          afterBlockEnds: true,
          afterComment: true,
          afterRuleEnds: true,
          beforeBlockEnds: true
        }
      })
    );
  }

  if (typeof source == 'string') {
    return remapBreaks(override$6(DEFAULTS$2, toHash(source)));
  }

  return DEFAULTS$2;
}

function toHash(string) {
  return string
    .split(OPTION_SEPARATOR$1)
    .reduce(function (accumulator, directive) {
      var parts = directive.split(OPTION_NAME_VALUE_SEPARATOR);
      var name = parts[0];
      var value = parts[1];

      if (name == 'breaks' || name == 'spaces') {
        accumulator[name] = hashValuesToHash(value);
      } else if (name == 'indentBy' || name == 'wrapAt') {
        accumulator[name] = parseInt(value);
      } else if (name == 'indentWith') {
        accumulator[name] = mapIndentWith(value);
      } else if (name == 'breakWith') {
        accumulator[name] = mapBreakWith(value);
      }

      return accumulator;
    }, {});
}

function hashValuesToHash(string) {
  return string
    .split(HASH_VALUES_OPTION_SEPARATOR)
    .reduce(function (accumulator, directive) {
      var parts = directive.split(HASH_VALUES_NAME_VALUE_SEPARATOR);
      var name = parts[0];
      var value = parts[1];

      accumulator[name] = normalizeValue$1(value);

      return accumulator;
    }, {});
}


function normalizeValue$1(value) {
  switch (value) {
    case FALSE_KEYWORD_1$1:
    case FALSE_KEYWORD_2$1:
      return false;
    case TRUE_KEYWORD_1$1:
    case TRUE_KEYWORD_2$1:
      return true;
    default:
      return value;
  }
}

function mapBreakWith(value) {
  switch (value) {
    case 'windows':
    case 'crlf':
    case BreakWith.CarriageReturnLineFeed:
      return BreakWith.CarriageReturnLineFeed;
    case 'unix':
    case 'lf':
    case BreakWith.LineFeed:
      return BreakWith.LineFeed;
    default:
      return systemLineBreak;
  }
}

function mapIndentWith(value) {
  switch (value) {
    case 'space':
      return IndentWith.Space;
    case 'tab':
      return IndentWith.Tab;
    default:
      return value;
  }
}

function remapBreaks(source) {
  for (var key in Breaks$1) {
    var breakName = Breaks$1[key];
    var breakValue = source.breaks[breakName];

    if (breakValue === true) {
      source.breaks[breakName] = source.breakWith;
    } else if (breakValue === false) {
      source.breaks[breakName] = '';
    } else {
      source.breaks[breakName] = source.breakWith.repeat(parseInt(breakValue));
    }
  }

  return source;
}

var format$3 = {
  Breaks: Breaks$1,
  Spaces: Spaces$2,
  formatFrom: formatFrom$1
};

var Marker$g = {
  ASTERISK: '*',
  AT: '@',
  BACK_SLASH: '\\',
  CARRIAGE_RETURN: '\r',
  CLOSE_CURLY_BRACKET: '}',
  CLOSE_ROUND_BRACKET: ')',
  CLOSE_SQUARE_BRACKET: ']',
  COLON: ':',
  COMMA: ',',
  DOUBLE_QUOTE: '"',
  EXCLAMATION: '!',
  FORWARD_SLASH: '/',
  INTERNAL: '-clean-css-',
  NEW_LINE_NIX: '\n',
  OPEN_CURLY_BRACKET: '{',
  OPEN_ROUND_BRACKET: '(',
  OPEN_SQUARE_BRACKET: '[',
  SEMICOLON: ';',
  SINGLE_QUOTE: '\'',
  SPACE: ' ',
  TAB: '\t',
  UNDERSCORE: '_'
};

var marker = Marker$g;

function formatPosition$4(metadata) {
  var line = metadata[0];
  var column = metadata[1];
  var source = metadata[2];

  return source ?
    source + ':' + line + ':' + column :
    line + ':' + column;
}

var formatPosition_1 = formatPosition$4;

var Spaces$1 = format$3.Spaces;
var Marker$f = marker;
var formatPosition$3 = formatPosition_1;

var CASE_ATTRIBUTE_PATTERN = /[\s"'][iI]\s*\]/;
var CASE_RESTORE_PATTERN = /([\d\w])([iI])\]/g;
var DOUBLE_QUOTE_CASE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"([iI])/g;
var DOUBLE_QUOTE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"(\s|\])/g;
var HTML_COMMENT_PATTERN = /^(?:(?:<!--|-->)\s*)+/;
var SINGLE_QUOTE_CASE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'([iI])/g;
var SINGLE_QUOTE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'(\s|\])/g;
var RELATION_PATTERN$1 = /[>\+~]/;
var WHITESPACE_PATTERN$2 = /\s/;

var ASTERISK_PLUS_HTML_HACK = '*+html ';
var ASTERISK_FIRST_CHILD_PLUS_HTML_HACK = '*:first-child+html ';
var LESS_THAN = '<';

var PSEUDO_CLASSES_WITH_SELECTORS = [
  ':current',
  ':future',
  ':has',
  ':host',
  ':host-context',
  ':is',
  ':not',
  ':past',
  ':where'
];

function hasInvalidCharacters(value) {
  var isEscaped;
  var isInvalid = false;
  var character;
  var isQuote = false;
  var i, l;

  for (i = 0, l = value.length; i < l; i++) {
    character = value[i];

    if (isEscaped) ; else if (character == Marker$f.SINGLE_QUOTE || character == Marker$f.DOUBLE_QUOTE) {
      isQuote = !isQuote;
    } else if (!isQuote && (character == Marker$f.CLOSE_CURLY_BRACKET || character == Marker$f.EXCLAMATION || character == LESS_THAN || character == Marker$f.SEMICOLON)) {
      isInvalid = true;
      break;
    } else if (!isQuote && i === 0 && RELATION_PATTERN$1.test(character)) {
      isInvalid = true;
      break;
    }

    isEscaped = character == Marker$f.BACK_SLASH;
  }

  return isInvalid;
}

function removeWhitespace(value, format) {
  var stripped = [];
  var character;
  var isNewLineNix;
  var isNewLineWin;
  var isEscaped;
  var wasEscaped;
  var isQuoted;
  var isSingleQuoted;
  var isDoubleQuoted;
  var isAttribute;
  var isRelation;
  var isWhitespace;
  var isSpaceAwarePseudoClass;
  var roundBracketLevel = 0;
  var wasComma = false;
  var wasRelation = false;
  var wasWhitespace = false;
  var withCaseAttribute = CASE_ATTRIBUTE_PATTERN.test(value);
  var spaceAroundRelation = format && format.spaces[Spaces$1.AroundSelectorRelation];
  var i, l;

  for (i = 0, l = value.length; i < l; i++) {
    character = value[i];

    isNewLineNix = character == Marker$f.NEW_LINE_NIX;
    isNewLineWin = character == Marker$f.NEW_LINE_NIX && value[i - 1] == Marker$f.CARRIAGE_RETURN;
    isQuoted = isSingleQuoted || isDoubleQuoted;
    isRelation = !isAttribute && !isEscaped && roundBracketLevel === 0 && RELATION_PATTERN$1.test(character);
    isWhitespace = WHITESPACE_PATTERN$2.test(character);
    isSpaceAwarePseudoClass = roundBracketLevel == 1 && character == Marker$f.CLOSE_ROUND_BRACKET ?
      false :
      isSpaceAwarePseudoClass || (roundBracketLevel === 0 && character == Marker$f.COLON && isPseudoClassWithSelectors(value, i));

    if (wasEscaped && isQuoted && isNewLineWin) {
      // swallow escaped new windows lines in comments
      stripped.pop();
      stripped.pop();
    } else if (isEscaped && isQuoted && isNewLineNix) {
      // swallow escaped new *nix lines in comments
      stripped.pop();
    } else if (isEscaped) {
      stripped.push(character);
    } else if (character == Marker$f.OPEN_SQUARE_BRACKET && !isQuoted) {
      stripped.push(character);
      isAttribute = true;
    } else if (character == Marker$f.CLOSE_SQUARE_BRACKET && !isQuoted) {
      stripped.push(character);
      isAttribute = false;
    } else if (character == Marker$f.OPEN_ROUND_BRACKET && !isQuoted) {
      stripped.push(character);
      roundBracketLevel++;
    } else if (character == Marker$f.CLOSE_ROUND_BRACKET && !isQuoted) {
      stripped.push(character);
      roundBracketLevel--;
    } else if (character == Marker$f.SINGLE_QUOTE && !isQuoted) {
      stripped.push(character);
      isSingleQuoted = true;
    } else if (character == Marker$f.DOUBLE_QUOTE && !isQuoted) {
      stripped.push(character);
      isDoubleQuoted = true;
    } else if (character == Marker$f.SINGLE_QUOTE && isQuoted) {
      stripped.push(character);
      isSingleQuoted = false;
    } else if (character == Marker$f.DOUBLE_QUOTE && isQuoted) {
      stripped.push(character);
      isDoubleQuoted = false;
    } else if (isWhitespace && wasRelation && !spaceAroundRelation) {
      continue;
    } else if (!isWhitespace && wasRelation && spaceAroundRelation) {
      stripped.push(Marker$f.SPACE);
      stripped.push(character);
    } else if (isWhitespace && !wasWhitespace && wasComma && roundBracketLevel > 0 && isSpaceAwarePseudoClass) ; else if (isWhitespace && !wasWhitespace && roundBracketLevel > 0 && isSpaceAwarePseudoClass) {
      stripped.push(character);
    } else if (isWhitespace && (isAttribute || roundBracketLevel > 0) && !isQuoted) ; else if (isWhitespace && wasWhitespace && !isQuoted) ; else if ((isNewLineWin || isNewLineNix) && (isAttribute || roundBracketLevel > 0) && isQuoted) ; else if (isRelation && wasWhitespace && !spaceAroundRelation) {
      stripped.pop();
      stripped.push(character);
    } else if (isRelation && !wasWhitespace && spaceAroundRelation) {
      stripped.push(Marker$f.SPACE);
      stripped.push(character);
    } else if (isWhitespace) {
      stripped.push(Marker$f.SPACE);
    } else {
      stripped.push(character);
    }

    wasEscaped = isEscaped;
    isEscaped = character == Marker$f.BACK_SLASH;
    wasRelation = isRelation;
    wasWhitespace = isWhitespace;
    wasComma = character == Marker$f.COMMA;
  }

  return withCaseAttribute ?
    stripped.join('').replace(CASE_RESTORE_PATTERN, '$1 $2]') :
    stripped.join('');
}

function isPseudoClassWithSelectors(value, colonPosition) {
  var pseudoClass = value.substring(colonPosition, value.indexOf(Marker$f.OPEN_ROUND_BRACKET, colonPosition));

  return PSEUDO_CLASSES_WITH_SELECTORS.indexOf(pseudoClass) > -1;
}

function removeQuotes(value) {
  if (value.indexOf('\'') == -1 && value.indexOf('"') == -1) {
    return value;
  }

  return value
    .replace(SINGLE_QUOTE_CASE_PATTERN, '=$1 $2')
    .replace(SINGLE_QUOTE_PATTERN, '=$1$2')
    .replace(DOUBLE_QUOTE_CASE_PATTERN, '=$1 $2')
    .replace(DOUBLE_QUOTE_PATTERN, '=$1$2');
}

function tidyRules$3(rules, removeUnsupported, adjacentSpace, format, warnings) {
  var list = [];
  var repeated = [];

  function removeHTMLComment(rule, match) {
    warnings.push('HTML comment \'' + match + '\' at ' + formatPosition$3(rule[2][0]) + '. Removing.');
    return '';
  }

  for (var i = 0, l = rules.length; i < l; i++) {
    var rule = rules[i];
    var reduced = rule[1];

    reduced = reduced.replace(HTML_COMMENT_PATTERN, removeHTMLComment.bind(null, rule));

    if (hasInvalidCharacters(reduced)) {
      warnings.push('Invalid selector \'' + rule[1] + '\' at ' + formatPosition$3(rule[2][0]) + '. Ignoring.');
      continue;
    }

    reduced = removeWhitespace(reduced, format);
    reduced = removeQuotes(reduced);

    if (adjacentSpace && reduced.indexOf('nav') > 0) {
      reduced = reduced.replace(/\+nav(\S|$)/, '+ nav$1');
    }

    if (removeUnsupported && reduced.indexOf(ASTERISK_PLUS_HTML_HACK) > -1) {
      continue;
    }

    if (removeUnsupported && reduced.indexOf(ASTERISK_FIRST_CHILD_PLUS_HTML_HACK) > -1) {
      continue;
    }

    if (reduced.indexOf('*') > -1) {
      reduced = reduced
        .replace(/\*([:#\.\[])/g, '$1')
        .replace(/^(\:first\-child)?\+html/, '*$1+html');
    }

    if (repeated.indexOf(reduced) > -1) {
      continue;
    }

    rule[1] = reduced;
    repeated.push(reduced);
    list.push(rule);
  }

  if (list.length == 1 && list[0][1].length === 0) {
    warnings.push('Empty selector \'' + list[0][1] + '\' at ' + formatPosition$3(list[0][2][0]) + '. Ignoring.');
    list = [];
  }

  return list;
}

var tidyRules_1 = tidyRules$3;

var SUPPORTED_COMPACT_BLOCK_MATCHER = /^@media\W/;
var SUPPORTED_QUOTE_REMOVAL_MATCHER = /^@(?:keyframes|-moz-keyframes|-o-keyframes|-webkit-keyframes)\W/;

function tidyBlock$1(values, spaceAfterClosingBrace) {
  var withoutSpaceAfterClosingBrace;
  var withoutQuotes;
  var i;

  for (i = values.length - 1; i >= 0; i--) {
    withoutSpaceAfterClosingBrace = !spaceAfterClosingBrace && SUPPORTED_COMPACT_BLOCK_MATCHER.test(values[i][1]);
    withoutQuotes = SUPPORTED_QUOTE_REMOVAL_MATCHER.test(values[i][1]);

    values[i][1] = values[i][1]
      .replace(/\n|\r\n/g, ' ')
      .replace(/\s+/g, ' ')
      .replace(/(,|:|\() /g, '$1')
      .replace(/ \)/g, ')');

    if (withoutQuotes) {
      values[i][1] = values[i][1]
        .replace(/'([a-zA-Z][a-zA-Z\d\-_]+)'/, '$1')
        .replace(/"([a-zA-Z][a-zA-Z\d\-_]+)"/, '$1');
    }

    if (withoutSpaceAfterClosingBrace) {
      values[i][1] = values[i][1]
        .replace(/\) /g, ')');
    }
  }

  return values;
}

var tidyBlock_1 = tidyBlock$1;

function tidyAtRule$1(value) {
  return value
    .replace(/\s+/g, ' ')
    .replace(/url\(\s+/g, 'url(')
    .replace(/\s+\)/g, ')')
    .trim();
}

var tidyAtRule_1 = tidyAtRule$1;

var Hack$3 = {
  ASTERISK: 'asterisk',
  BANG: 'bang',
  BACKSLASH: 'backslash',
  UNDERSCORE: 'underscore'
};

var hack = Hack$3;

function removeUnused$2(properties) {
  for (var i = properties.length - 1; i >= 0; i--) {
    var property = properties[i];

    if (property.unused) {
      property.all.splice(property.position, 1);
    }
  }
}

var removeUnused_1 = removeUnused$2;

var Hack$2 = hack;

var Marker$e = marker;

var ASTERISK_HACK = '*';
var BACKSLASH_HACK = '\\';
var IMPORTANT_TOKEN = '!important';
var UNDERSCORE_HACK = '_';
var BANG_HACK = '!ie';

function restoreFromOptimizing$5(properties, restoreCallback) {
  var property;
  var restored;
  var current;
  var i;

  for (i = properties.length - 1; i >= 0; i--) {
    property = properties[i];

    if (property.dynamic && property.important) {
      restoreImportant(property);
      continue;
    }

    if (property.dynamic) {
      continue;
    }

    if (property.unused) {
      continue;
    }

    if (!property.dirty && !property.important && !property.hack) {
      continue;
    }

    if (property.optimizable && restoreCallback) {
      restored = restoreCallback(property);
      property.value = restored;
    } else {
      restored = property.value;
    }

    if (property.important) {
      restoreImportant(property);
    }

    if (property.hack) {
      restoreHack(property);
    }

    if ('all' in property) {
      current = property.all[property.position];
      current[1][1] = property.name;

      current.splice(2, current.length - 1);
      Array.prototype.push.apply(current, restored);
    }
  }
}

function restoreImportant(property) {
  property.value[property.value.length - 1][1] += IMPORTANT_TOKEN;
}

function restoreHack(property) {
  if (property.hack[0] == Hack$2.UNDERSCORE) {
    property.name = UNDERSCORE_HACK + property.name;
  } else if (property.hack[0] == Hack$2.ASTERISK) {
    property.name = ASTERISK_HACK + property.name;
  } else if (property.hack[0] == Hack$2.BACKSLASH) {
    property.value[property.value.length - 1][1] += BACKSLASH_HACK + property.hack[1];
  } else if (property.hack[0] == Hack$2.BANG) {
    property.value[property.value.length - 1][1] += Marker$e.SPACE + BANG_HACK;
  }
}

var restoreFromOptimizing_1 = restoreFromOptimizing$5;

var Token$o = {
  AT_RULE: 'at-rule', // e.g. `@import`, `@charset`
  AT_RULE_BLOCK: 'at-rule-block', // e.g. `@font-face{...}`
  AT_RULE_BLOCK_SCOPE: 'at-rule-block-scope', // e.g. `@font-face`
  COMMENT: 'comment', // e.g. `/* comment */`
  NESTED_BLOCK: 'nested-block', // e.g. `@media screen{...}`, `@keyframes animation {...}`
  NESTED_BLOCK_SCOPE: 'nested-block-scope', // e.g. `@media`, `@keyframes`
  PROPERTY: 'property', // e.g. `color:red`
  PROPERTY_BLOCK: 'property-block', // e.g. `--var:{color:red}`
  PROPERTY_NAME: 'property-name', // e.g. `color`
  PROPERTY_VALUE: 'property-value', // e.g. `red`
  RAW: 'raw', // e.g. anything between /* clean-css ignore:start */ and /* clean-css ignore:end */ comments
  RULE: 'rule', // e.g `div > a{...}`
  RULE_SCOPE: 'rule-scope' // e.g `div > a`
};

var token = Token$o;

var Hack$1 = hack;

var Marker$d = marker;
var Token$n = token;

var Match = {
  ASTERISK: '*',
  BACKSLASH: '\\',
  BANG: '!',
  BANG_SUFFIX_PATTERN: /!\w+$/,
  IMPORTANT_TOKEN: '!important',
  IMPORTANT_TOKEN_PATTERN: new RegExp('!important$', 'i'),
  IMPORTANT_WORD: 'important',
  IMPORTANT_WORD_PATTERN: new RegExp('important$', 'i'),
  SUFFIX_BANG_PATTERN: /!$/,
  UNDERSCORE: '_',
  VARIABLE_REFERENCE_PATTERN: /var\(--.+\)$/
};

function wrapAll(properties, skipProperties) {
  var wrapped = [];
  var single;
  var property;
  var i;

  for (i = properties.length - 1; i >= 0; i--) {
    property = properties[i];

    if (property[0] != Token$n.PROPERTY) {
      continue;
    }

    if (skipProperties && skipProperties.indexOf(property[1][1]) > -1) {
      continue;
    }

    single = wrapSingle$3(property);
    single.all = properties;
    single.position = i;
    wrapped.unshift(single);
  }

  return wrapped;
}

function someVariableReferences(property) {
  var i, l;
  var value;

  // skipping `property` and property name tokens
  for (i = 2, l = property.length; i < l; i++) {
    value = property[i];

    if (value[0] != Token$n.PROPERTY_VALUE) {
      continue;
    }

    if (isVariableReference(value[1])) {
      return true;
    }
  }

  return false;
}

function isVariableReference(value) {
  return Match.VARIABLE_REFERENCE_PATTERN.test(value);
}

function isMultiplex(property) {
  var value;
  var i, l;

  for (i = 3, l = property.length; i < l; i++) {
    value = property[i];

    if (value[0] == Token$n.PROPERTY_VALUE && (value[1] == Marker$d.COMMA || value[1] == Marker$d.FORWARD_SLASH)) {
      return true;
    }
  }

  return false;
}

function hackFrom(property) {
  var match = false;
  var name = property[1][1];
  var lastValue = property[property.length - 1];

  if (name[0] == Match.UNDERSCORE) {
    match = [Hack$1.UNDERSCORE];
  } else if (name[0] == Match.ASTERISK) {
    match = [Hack$1.ASTERISK];
  } else if (lastValue[1][0] == Match.BANG && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN)) {
    match = [Hack$1.BANG];
  } else if (lastValue[1].indexOf(Match.BANG) > 0 && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN) && Match.BANG_SUFFIX_PATTERN.test(lastValue[1])) {
    match = [Hack$1.BANG];
  } else if (lastValue[1].indexOf(Match.BACKSLASH) > 0 && lastValue[1].indexOf(Match.BACKSLASH) == lastValue[1].length - Match.BACKSLASH.length - 1) {
    match = [Hack$1.BACKSLASH, lastValue[1].substring(lastValue[1].indexOf(Match.BACKSLASH) + 1)];
  } else if (lastValue[1].indexOf(Match.BACKSLASH) === 0 && lastValue[1].length == 2) {
    match = [Hack$1.BACKSLASH, lastValue[1].substring(1)];
  }

  return match;
}

function isImportant(property) {
  if (property.length < 3)
    return false;

  var lastValue = property[property.length - 1];
  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
    return true;
  } else if (Match.IMPORTANT_WORD_PATTERN.test(lastValue[1]) && Match.SUFFIX_BANG_PATTERN.test(property[property.length - 2][1])) {
    return true;
  }

  return false;
}

function stripImportant(property) {
  var lastValue = property[property.length - 1];
  var oneButLastValue = property[property.length - 2];

  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_TOKEN_PATTERN, '');
  } else {
    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_WORD_PATTERN, '');
    oneButLastValue[1] = oneButLastValue[1].replace(Match.SUFFIX_BANG_PATTERN, '');
  }

  if (lastValue[1].length === 0) {
    property.pop();
  }

  if (oneButLastValue[1].length === 0) {
    property.pop();
  }
}

function stripPrefixHack(property) {
  property[1][1] = property[1][1].substring(1);
}

function stripSuffixHack(property, hackFrom) {
  var lastValue = property[property.length - 1];
  lastValue[1] = lastValue[1]
    .substring(0, lastValue[1].indexOf(hackFrom[0] == Hack$1.BACKSLASH ? Match.BACKSLASH : Match.BANG))
    .trim();

  if (lastValue[1].length === 0) {
    property.pop();
  }
}

function wrapSingle$3(property) {
  var importantProperty = isImportant(property);
  if (importantProperty) {
    stripImportant(property);
  }

  var whichHack = hackFrom(property);
  if (whichHack[0] == Hack$1.ASTERISK || whichHack[0] == Hack$1.UNDERSCORE) {
    stripPrefixHack(property);
  } else if (whichHack[0] == Hack$1.BACKSLASH || whichHack[0] == Hack$1.BANG) {
    stripSuffixHack(property, whichHack);
  }

  return {
    block: property[2] && property[2][0] == Token$n.PROPERTY_BLOCK,
    components: [],
    dirty: false,
    dynamic: someVariableReferences(property),
    hack: whichHack,
    important: importantProperty,
    name: property[1][1],
    multiplex: property.length > 3 ? isMultiplex(property) : false,
    optimizable: true,
    position: 0,
    shorthand: false,
    unused: false,
    value: property.slice(2)
  };
}

var wrapForOptimizing$3 = {
  all: wrapAll,
  single: wrapSingle$3
};

function InvalidPropertyError$2(message) {
  this.name = 'InvalidPropertyError';
  this.message = message;
  this.stack = (new Error()).stack;
}

InvalidPropertyError$2.prototype = Object.create(Error.prototype);
InvalidPropertyError$2.prototype.constructor = InvalidPropertyError$2;

var invalidPropertyError = InvalidPropertyError$2;

var InvalidPropertyError$1 = invalidPropertyError;

var wrapSingle$2 = wrapForOptimizing$3.single;

var Token$m = token;
var Marker$c = marker;

var formatPosition$2 = formatPosition_1;

function _anyIsInherit(values) {
  var i, l;

  for (i = 0, l = values.length; i < l; i++) {
    if (values[i][1] == 'inherit') {
      return true;
    }
  }

  return false;
}

function _colorFilter(validator) {
  return function (value) {
    return value[1] == 'invert' || validator.isColor(value[1]) || validator.isPrefixed(value[1]);
  };
}

function _styleFilter(validator) {
  return function (value) {
    return value[1] != 'inherit' && validator.isStyleKeyword(value[1]) && !validator.isColorFunction(value[1]);
  };
}

function _wrapDefault(name, property, configuration) {
  var descriptor = configuration[name];
  if (descriptor.doubleValues && descriptor.defaultValue.length == 2) {
    return wrapSingle$2([
      Token$m.PROPERTY,
      [Token$m.PROPERTY_NAME, name],
      [Token$m.PROPERTY_VALUE, descriptor.defaultValue[0]],
      [Token$m.PROPERTY_VALUE, descriptor.defaultValue[1]]
    ]);
  } else if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
    return wrapSingle$2([
      Token$m.PROPERTY,
      [Token$m.PROPERTY_NAME, name],
      [Token$m.PROPERTY_VALUE, descriptor.defaultValue[0]]
    ]);
  } else {
    return wrapSingle$2([
      Token$m.PROPERTY,
      [Token$m.PROPERTY_NAME, name],
      [Token$m.PROPERTY_VALUE, descriptor.defaultValue]
    ]);
  }
}

function _widthFilter(validator) {
  return function (value) {
    return value[1] != 'inherit' &&
      (validator.isWidth(value[1]) || validator.isUnit(value[1]) || validator.isDynamicUnit(value[1])) &&
      !validator.isStyleKeyword(value[1]) &&
      !validator.isColorFunction(value[1]);
  };
}

function animation(property, configuration, validator) {
  var duration = _wrapDefault(property.name + '-duration', property, configuration);
  var timing = _wrapDefault(property.name + '-timing-function', property, configuration);
  var delay = _wrapDefault(property.name + '-delay', property, configuration);
  var iteration = _wrapDefault(property.name + '-iteration-count', property, configuration);
  var direction = _wrapDefault(property.name + '-direction', property, configuration);
  var fill = _wrapDefault(property.name + '-fill-mode', property, configuration);
  var play = _wrapDefault(property.name + '-play-state', property, configuration);
  var name = _wrapDefault(property.name + '-name', property, configuration);
  var components = [duration, timing, delay, iteration, direction, fill, play, name];
  var values = property.value;
  var value;
  var durationSet = false;
  var timingSet = false;
  var delaySet = false;
  var iterationSet = false;
  var directionSet = false;
  var fillSet = false;
  var playSet = false;
  var nameSet = false;
  var i;
  var l;

  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
    duration.value = timing.value = delay.value = iteration.value = direction.value = fill.value = play.value = name.value = property.value;
    return components;
  }

  if (values.length > 1 && _anyIsInherit(values)) {
    throw new InvalidPropertyError$1('Invalid animation values at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  for (i = 0, l = values.length; i < l; i++) {
    value = values[i];

    if (validator.isTime(value[1]) && !durationSet) {
      duration.value = [value];
      durationSet = true;
    } else if (validator.isTime(value[1]) && !delaySet) {
      delay.value = [value];
      delaySet = true;
    } else if ((validator.isGlobal(value[1]) || validator.isTimingFunction(value[1])) && !timingSet) {
      timing.value = [value];
      timingSet = true;
    } else if ((validator.isAnimationIterationCountKeyword(value[1]) || validator.isPositiveNumber(value[1])) && !iterationSet) {
      iteration.value = [value];
      iterationSet = true;
    } else if (validator.isAnimationDirectionKeyword(value[1]) && !directionSet) {
      direction.value = [value];
      directionSet = true;
    } else if (validator.isAnimationFillModeKeyword(value[1]) && !fillSet) {
      fill.value = [value];
      fillSet = true;
    } else if (validator.isAnimationPlayStateKeyword(value[1]) && !playSet) {
      play.value = [value];
      playSet = true;
    } else if ((validator.isAnimationNameKeyword(value[1]) || validator.isIdentifier(value[1])) && !nameSet) {
      name.value = [value];
      nameSet = true;
    } else {
      throw new InvalidPropertyError$1('Invalid animation value at ' + formatPosition$2(value[2][0]) + '. Ignoring.');
    }
  }

  return components;
}

function background$2(property, configuration, validator) {
  var image = _wrapDefault('background-image', property, configuration);
  var position = _wrapDefault('background-position', property, configuration);
  var size = _wrapDefault('background-size', property, configuration);
  var repeat = _wrapDefault('background-repeat', property, configuration);
  var attachment = _wrapDefault('background-attachment', property, configuration);
  var origin = _wrapDefault('background-origin', property, configuration);
  var clip = _wrapDefault('background-clip', property, configuration);
  var color = _wrapDefault('background-color', property, configuration);
  var components = [image, position, size, repeat, attachment, origin, clip, color];
  var values = property.value;

  var positionSet = false;
  var clipSet = false;
  var originSet = false;
  var repeatSet = false;

  var anyValueSet = false;

  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
    // NOTE: 'inherit' is not a valid value for background-attachment
    color.value = image.value =  repeat.value = position.value = size.value = origin.value = clip.value = property.value;
    return components;
  }

  if (property.value.length == 1 && property.value[0][1] == '0 0') {
    return components;
  }

  for (var i = values.length - 1; i >= 0; i--) {
    var value = values[i];

    if (validator.isBackgroundAttachmentKeyword(value[1])) {
      attachment.value = [value];
      anyValueSet = true;
    } else if (validator.isBackgroundClipKeyword(value[1]) || validator.isBackgroundOriginKeyword(value[1])) {
      if (clipSet) {
        origin.value = [value];
        originSet = true;
      } else {
        clip.value = [value];
        clipSet = true;
      }
      anyValueSet = true;
    } else if (validator.isBackgroundRepeatKeyword(value[1])) {
      if (repeatSet) {
        repeat.value.unshift(value);
      } else {
        repeat.value = [value];
        repeatSet = true;
      }
      anyValueSet = true;
    } else if (validator.isBackgroundPositionKeyword(value[1]) || validator.isBackgroundSizeKeyword(value[1]) || validator.isUnit(value[1]) || validator.isDynamicUnit(value[1])) {
      if (i > 0) {
        var previousValue = values[i - 1];

        if (previousValue[1] == Marker$c.FORWARD_SLASH) {
          size.value = [value];
        } else if (i > 1 && values[i - 2][1] == Marker$c.FORWARD_SLASH) {
          size.value = [previousValue, value];
          i -= 2;
        } else {
          if (!positionSet)
            position.value = [];

          position.value.unshift(value);
          positionSet = true;
        }
      } else {
        if (!positionSet)
          position.value = [];

        position.value.unshift(value);
        positionSet = true;
      }
      anyValueSet = true;
    } else if ((color.value[0][1] == configuration[color.name].defaultValue || color.value[0][1] == 'none') && (validator.isColor(value[1]) || validator.isPrefixed(value[1]))) {
      color.value = [value];
      anyValueSet = true;
    } else if (validator.isUrl(value[1]) || validator.isFunction(value[1])) {
      image.value = [value];
      anyValueSet = true;
    }
  }

  if (clipSet && !originSet)
    origin.value = clip.value.slice(0);

  if (!anyValueSet) {
    throw new InvalidPropertyError$1('Invalid background value at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  return components;
}

function borderRadius$2(property, configuration) {
  var values = property.value;
  var splitAt = -1;

  for (var i = 0, l = values.length; i < l; i++) {
    if (values[i][1] == Marker$c.FORWARD_SLASH) {
      splitAt = i;
      break;
    }
  }

  if (splitAt === 0 || splitAt === values.length - 1) {
    throw new InvalidPropertyError$1('Invalid border-radius value at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  var target = _wrapDefault(property.name, property, configuration);
  target.value = splitAt > -1 ?
    values.slice(0, splitAt) :
    values.slice(0);
  target.components = fourValues$1(target, configuration);

  var remainder = _wrapDefault(property.name, property, configuration);
  remainder.value = splitAt > -1 ?
    values.slice(splitAt + 1) :
    values.slice(0);
  remainder.components = fourValues$1(remainder, configuration);

  for (var j = 0; j < 4; j++) {
    target.components[j].multiplex = true;
    target.components[j].value = target.components[j].value.concat(remainder.components[j].value);
  }

  return target.components;
}

function font$1(property, configuration, validator) {
  var style = _wrapDefault('font-style', property, configuration);
  var variant = _wrapDefault('font-variant', property, configuration);
  var weight = _wrapDefault('font-weight', property, configuration);
  var stretch = _wrapDefault('font-stretch', property, configuration);
  var size = _wrapDefault('font-size', property, configuration);
  var height = _wrapDefault('line-height', property, configuration);
  var family = _wrapDefault('font-family', property, configuration);
  var components = [style, variant, weight, stretch, size, height, family];
  var values = property.value;
  var fuzzyMatched = 4; // style, variant, weight, and stretch
  var index = 0;
  var isStretchSet = false;
  var isStretchValid;
  var isStyleSet = false;
  var isStyleValid;
  var isVariantSet = false;
  var isVariantValid;
  var isWeightSet = false;
  var isWeightValid;
  var appendableFamilyName = false;

  if (!values[index]) {
    throw new InvalidPropertyError$1('Missing font values at ' + formatPosition$2(property.all[property.position][1][2][0]) + '. Ignoring.');
  }

  if (values.length == 1 && values[0][1] == 'inherit') {
    style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
    return components;
  }

  if (values.length == 1 && (validator.isFontKeyword(values[0][1]) || validator.isGlobal(values[0][1]) || validator.isPrefixed(values[0][1]))) {
    values[0][1] = Marker$c.INTERNAL + values[0][1];
    style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
    return components;
  }

  if (values.length < 2 || !_anyIsFontSize(values, validator) || !_anyIsFontFamily(values, validator)) {
    throw new InvalidPropertyError$1('Invalid font values at ' + formatPosition$2(property.all[property.position][1][2][0]) + '. Ignoring.');
  }

  if (values.length > 1 && _anyIsInherit(values)) {
    throw new InvalidPropertyError$1('Invalid font values at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  // fuzzy match style, variant, weight, and stretch on first elements
  while (index < fuzzyMatched) {
    isStretchValid = validator.isFontStretchKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
    isStyleValid = validator.isFontStyleKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
    isVariantValid = validator.isFontVariantKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
    isWeightValid = validator.isFontWeightKeyword(values[index][1]) || validator.isGlobal(values[index][1]);

    if (isStyleValid && !isStyleSet) {
      style.value = [values[index]];
      isStyleSet = true;
    } else if (isVariantValid && !isVariantSet) {
      variant.value = [values[index]];
      isVariantSet = true;
    } else if (isWeightValid && !isWeightSet) {
      weight.value = [values[index]];
      isWeightSet = true;
    } else if (isStretchValid && !isStretchSet) {
      stretch.value = [values[index]];
      isStretchSet = true;
    } else if (isStyleValid && isStyleSet || isVariantValid && isVariantSet || isWeightValid && isWeightSet || isStretchValid && isStretchSet) {
      throw new InvalidPropertyError$1('Invalid font style / variant / weight / stretch value at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
    } else {
      break;
    }

    index++;
  }

  // now comes font-size ...
  if (validator.isFontSizeKeyword(values[index][1]) || validator.isUnit(values[index][1]) && !validator.isDynamicUnit(values[index][1])) {
    size.value = [values[index]];
    index++;
  } else {
    throw new InvalidPropertyError$1('Missing font size at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  if (!values[index]) {
    throw new InvalidPropertyError$1('Missing font family at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  // ... and perhaps line-height
  if (values[index] && values[index][1] == Marker$c.FORWARD_SLASH && values[index + 1] && (validator.isLineHeightKeyword(values[index + 1][1]) || validator.isUnit(values[index + 1][1]) || validator.isNumber(values[index + 1][1]))) {
    height.value = [values[index + 1]];
    index++;
    index++;
  }

  // ... and whatever comes next is font-family
  family.value = [];

  while (values[index]) {
    if (values[index][1] == Marker$c.COMMA) {
      appendableFamilyName = false;
    } else {
      if (appendableFamilyName) {
        family.value[family.value.length - 1][1] += Marker$c.SPACE + values[index][1];
      } else {
        family.value.push(values[index]);
      }

      appendableFamilyName = true;
    }

    index++;
  }

  if (family.value.length === 0) {
    throw new InvalidPropertyError$1('Missing font family at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  return components;
}

function _anyIsFontSize(values, validator) {
  var value;
  var i, l;

  for (i = 0, l = values.length; i < l; i++) {
    value = values[i];

    if (validator.isFontSizeKeyword(value[1]) || validator.isUnit(value[1]) && !validator.isDynamicUnit(value[1]) || validator.isFunction(value[1])) {
      return true;
    }
  }

  return false;
}

function _anyIsFontFamily(values, validator) {
  var value;
  var i, l;

  for (i = 0, l = values.length; i < l; i++) {
    value = values[i];

    if (validator.isIdentifier(value[1]) || validator.isQuotedText(value[1])) {
      return true;
    }
  }

  return false;
}

function fourValues$1(property, configuration) {
  var componentNames = configuration[property.name].components;
  var components = [];
  var value = property.value;

  if (value.length < 1)
    return [];

  if (value.length < 2)
    value[1] = value[0].slice(0);
  if (value.length < 3)
    value[2] = value[0].slice(0);
  if (value.length < 4)
    value[3] = value[1].slice(0);

  for (var i = componentNames.length - 1; i >= 0; i--) {
    var component = wrapSingle$2([
      Token$m.PROPERTY,
      [Token$m.PROPERTY_NAME, componentNames[i]]
    ]);
    component.value = [value[i]];
    components.unshift(component);
  }

  return components;
}

function multiplex$1(splitWith) {
  return function (property, configuration, validator) {
    var splitsAt = [];
    var values = property.value;
    var i, j, l, m;

    // find split commas
    for (i = 0, l = values.length; i < l; i++) {
      if (values[i][1] == ',')
        splitsAt.push(i);
    }

    if (splitsAt.length === 0)
      return splitWith(property, configuration, validator);

    var splitComponents = [];

    // split over commas, and into components
    for (i = 0, l = splitsAt.length; i <= l; i++) {
      var from = i === 0 ? 0 : splitsAt[i - 1] + 1;
      var to = i < l ? splitsAt[i] : values.length;

      var _property = _wrapDefault(property.name, property, configuration);
      _property.value = values.slice(from, to);

      if (_property.value.length > 0) {
        splitComponents.push(splitWith(_property, configuration, validator));
      }
    }

    var components = splitComponents[0];

    // group component values from each split
    for (i = 0, l = components.length; i < l; i++) {
      components[i].multiplex = true;

      for (j = 1, m = splitComponents.length; j < m; j++) {
        components[i].value.push([Token$m.PROPERTY_VALUE, Marker$c.COMMA]);
        Array.prototype.push.apply(components[i].value, splitComponents[j][i].value);
      }
    }

    return components;
  };
}

function listStyle(property, configuration, validator) {
  var type = _wrapDefault('list-style-type', property, configuration);
  var position = _wrapDefault('list-style-position', property, configuration);
  var image = _wrapDefault('list-style-image', property, configuration);
  var components = [type, position, image];

  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
    type.value = position.value = image.value = [property.value[0]];
    return components;
  }

  var values = property.value.slice(0);
  var total = values.length;
  var index = 0;

  // `image` first...
  for (index = 0, total = values.length; index < total; index++) {
    if (validator.isUrl(values[index][1]) || values[index][1] == '0') {
      image.value = [values[index]];
      values.splice(index, 1);
      break;
    }
  }

  // ... then `position`
  for (index = 0, total = values.length; index < total; index++) {
    if (validator.isListStylePositionKeyword(values[index][1])) {
      position.value = [values[index]];
      values.splice(index, 1);
      break;
    }
  }

  // ... and what's left is a `type`
  if (values.length > 0 && (validator.isListStyleTypeKeyword(values[0][1]) || validator.isIdentifier(values[0][1]))) {
    type.value = [values[0]];
  }

  return components;
}

function transition(property, configuration, validator) {
  var prop = _wrapDefault(property.name + '-property', property, configuration);
  var duration = _wrapDefault(property.name + '-duration', property, configuration);
  var timing = _wrapDefault(property.name + '-timing-function', property, configuration);
  var delay = _wrapDefault(property.name + '-delay', property, configuration);
  var components = [prop, duration, timing, delay];
  var values = property.value;
  var value;
  var durationSet = false;
  var delaySet = false;
  var propSet = false;
  var timingSet = false;
  var i;
  var l;

  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
    prop.value = duration.value = timing.value = delay.value = property.value;
    return components;
  }

  if (values.length > 1 && _anyIsInherit(values)) {
    throw new InvalidPropertyError$1('Invalid animation values at ' + formatPosition$2(values[0][2][0]) + '. Ignoring.');
  }

  for (i = 0, l = values.length; i < l; i++) {
    value = values[i];

    if (validator.isTime(value[1]) && !durationSet) {
      duration.value = [value];
      durationSet = true;
    } else if (validator.isTime(value[1]) && !delaySet) {
      delay.value = [value];
      delaySet = true;
    } else if ((validator.isGlobal(value[1]) || validator.isTimingFunction(value[1])) && !timingSet) {
      timing.value = [value];
      timingSet = true;
    } else if (validator.isIdentifier(value[1]) && !propSet) {
      prop.value = [value];
      propSet = true;
    } else {
      throw new InvalidPropertyError$1('Invalid animation value at ' + formatPosition$2(value[2][0]) + '. Ignoring.');
    }
  }

  return components;
}

function widthStyleColor(property, configuration, validator) {
  var descriptor = configuration[property.name];
  var components = [
    _wrapDefault(descriptor.components[0], property, configuration),
    _wrapDefault(descriptor.components[1], property, configuration),
    _wrapDefault(descriptor.components[2], property, configuration)
  ];
  var color, style, width;

  for (var i = 0; i < 3; i++) {
    var component = components[i];

    if (component.name.indexOf('color') > 0)
      color = component;
    else if (component.name.indexOf('style') > 0)
      style = component;
    else
      width = component;
  }

  if ((property.value.length == 1 && property.value[0][1] == 'inherit') ||
      (property.value.length == 3 && property.value[0][1] == 'inherit' && property.value[1][1] == 'inherit' && property.value[2][1] == 'inherit')) {
    color.value = style.value = width.value = [property.value[0]];
    return components;
  }

  var values = property.value.slice(0);
  var match, matches;

  // NOTE: usually users don't follow the required order of parts in this shorthand,
  // so we'll try to parse it caring as little about order as possible

  if (values.length > 0) {
    matches = values.filter(_widthFilter(validator));
    match = matches.length > 1 && (matches[0][1] == 'none' || matches[0][1] == 'auto') ? matches[1] : matches[0];
    if (match) {
      width.value = [match];
      values.splice(values.indexOf(match), 1);
    }
  }

  if (values.length > 0) {
    match = values.filter(_styleFilter(validator))[0];
    if (match) {
      style.value = [match];
      values.splice(values.indexOf(match), 1);
    }
  }

  if (values.length > 0) {
    match = values.filter(_colorFilter(validator))[0];
    if (match) {
      color.value = [match];
      values.splice(values.indexOf(match), 1);
    }
  }

  return components;
}

var breakUp$1 = {
  animation: animation,
  background: background$2,
  border: widthStyleColor,
  borderRadius: borderRadius$2,
  font: font$1,
  fourValues: fourValues$1,
  listStyle: listStyle,
  multiplex: multiplex$1,
  outline: widthStyleColor,
  transition: transition
};

var VENDOR_PREFIX_PATTERN = /(?:^|\W)(\-\w+\-)/g;

function unique(value) {
  var prefixes = [];
  var match;

  while ((match = VENDOR_PREFIX_PATTERN.exec(value)) !== null) {
    if (prefixes.indexOf(match[0]) == -1) {
      prefixes.push(match[0]);
    }
  }

  return prefixes;
}

function same(value1, value2) {
  return unique(value1).sort().join(',') == unique(value2).sort().join(',');
}

var vendorPrefixes = {
  unique: unique,
  same: same
};

var sameVendorPrefixes = vendorPrefixes.same;

function understandable$1(validator, value1, value2, _position, isPaired) {
  if (!sameVendorPrefixes(value1, value2)) {
    return false;
  }

  if (isPaired && validator.isVariable(value1) !== validator.isVariable(value2)) {
    return false;
  }

  return true;
}

var understandable_1 = understandable$1;

var understandable = understandable_1;

function animationIterationCount(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isAnimationIterationCountKeyword(value2) || validator.isPositiveNumber(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isAnimationIterationCountKeyword(value2) || validator.isPositiveNumber(value2);
}

function animationName(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isAnimationNameKeyword(value2) || validator.isIdentifier(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isAnimationNameKeyword(value2) || validator.isIdentifier(value2);
}

function areSameFunction(validator, value1, value2) {
  if (!validator.isFunction(value1) || !validator.isFunction(value2)) {
    return false;
  }

  var function1Name = value1.substring(0, value1.indexOf('('));
  var function2Name = value2.substring(0, value2.indexOf('('));

  var function1Value = value1.substring(function1Name.length + 1, value1.length - 1);
  var function2Value = value2.substring(function2Name.length + 1, value2.length - 1);

  if (validator.isFunction(function1Value) || validator.isFunction(function2Value)) {
    return function1Name === function2Name && areSameFunction(validator, function1Value, function2Value);
  } else {
    return function1Name === function2Name;
  }
}

function backgroundPosition(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isBackgroundPositionKeyword(value2) || validator.isGlobal(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (validator.isBackgroundPositionKeyword(value2) || validator.isGlobal(value2)) {
    return true;
  }

  return unit$1(validator, value1, value2);
}

function backgroundSize(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isBackgroundSizeKeyword(value2) || validator.isGlobal(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (validator.isBackgroundSizeKeyword(value2) || validator.isGlobal(value2)) {
    return true;
  }

  return unit$1(validator, value1, value2);
}

function color$1(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isColor(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (!validator.colorOpacity && (validator.isRgbColor(value1) || validator.isHslColor(value1))) {
    return false;
  } else if (!validator.colorOpacity && (validator.isRgbColor(value2) || validator.isHslColor(value2))) {
    return false;
  } else if (!validator.colorHexAlpha && (validator.isHexAlphaColor(value1) || validator.isHexAlphaColor(value2))) {
    return false;
  } else if (validator.isColor(value1) && validator.isColor(value2)) {
    return true;
  }

  return sameFunctionOrValue(validator, value1, value2);
}

function components(overrideCheckers) {
  return function (validator, value1, value2, position) {
    return overrideCheckers[position](validator, value1, value2);
  };
}

function fontFamily(validator, value1, value2) {
  return understandable(validator, value1, value2, 0, true);
}

function image(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isImage(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (validator.isImage(value2)) {
    return true;
  } else if (validator.isImage(value1)) {
    return false;
  }

  return sameFunctionOrValue(validator, value1, value2);
}

function keyword(propertyName) {
  return function(validator, value1, value2) {
    if (!understandable(validator, value1, value2, 0, true) && !validator.isKeyword(propertyName)(value2)) {
      return false;
    } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
      return true;
    }

    return validator.isKeyword(propertyName)(value2);
  };
}

function keywordWithGlobal(propertyName) {
  return function(validator, value1, value2) {
    if (!understandable(validator, value1, value2, 0, true) && !(validator.isKeyword(propertyName)(value2) || validator.isGlobal(value2))) {
      return false;
    } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
      return true;
    }

    return validator.isKeyword(propertyName)(value2) || validator.isGlobal(value2);
  };
}

function propertyName$1(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isIdentifier(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isIdentifier(value2);
}

function sameFunctionOrValue(validator, value1, value2) {
  return areSameFunction(validator, value1, value2) ?
    true :
    value1 === value2;
}

function textShadow(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isUnit(value2) || validator.isColor(value2) || validator.isGlobal(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isUnit(value2) || validator.isColor(value2) || validator.isGlobal(value2);
}

function time$1(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isTime(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (validator.isTime(value1) && !validator.isTime(value2)) {
    return false;
  } else if (validator.isTime(value2)) {
    return true;
  } else if (validator.isTime(value1)) {
    return false;
  } else if (validator.isFunction(value1) && !validator.isPrefixed(value1) && validator.isFunction(value2) && !validator.isPrefixed(value2)) {
    return true;
  }

  return sameFunctionOrValue(validator, value1, value2);
}

function timingFunction(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isTimingFunction(value2) || validator.isGlobal(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isTimingFunction(value2) || validator.isGlobal(value2);
}

function unit$1(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isUnit(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if (validator.isUnit(value1) && !validator.isUnit(value2)) {
    return false;
  } else if (validator.isUnit(value2)) {
    return true;
  } else if (validator.isUnit(value1)) {
    return false;
  } else if (validator.isFunction(value1) && !validator.isPrefixed(value1) && validator.isFunction(value2) && !validator.isPrefixed(value2)) {
    return true;
  }

  return sameFunctionOrValue(validator, value1, value2);
}

function unitOrKeywordWithGlobal(propertyName) {
  var byKeyword = keywordWithGlobal(propertyName);

  return function(validator, value1, value2) {
    return unit$1(validator, value1, value2) || byKeyword(validator, value1, value2);
  };
}

function unitOrNumber(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !(validator.isUnit(value2) || validator.isNumber(value2))) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  } else if ((validator.isUnit(value1) || validator.isNumber(value1)) && !(validator.isUnit(value2) || validator.isNumber(value2))) {
    return false;
  } else if (validator.isUnit(value2) || validator.isNumber(value2)) {
    return true;
  } else if (validator.isUnit(value1) || validator.isNumber(value1)) {
    return false;
  } else if (validator.isFunction(value1) && !validator.isPrefixed(value1) && validator.isFunction(value2) && !validator.isPrefixed(value2)) {
    return true;
  }

  return sameFunctionOrValue(validator, value1, value2);
}

function zIndex(validator, value1, value2) {
  if (!understandable(validator, value1, value2, 0, true) && !validator.isZIndex(value2)) {
    return false;
  } else if (validator.isVariable(value1) && validator.isVariable(value2)) {
    return true;
  }

  return validator.isZIndex(value2);
}

var canOverride$1 = {
  generic: {
    color: color$1,
    components: components,
    image: image,
    propertyName: propertyName$1,
    time: time$1,
    timingFunction: timingFunction,
    unit: unit$1,
    unitOrNumber: unitOrNumber
  },
  property: {
    animationDirection: keywordWithGlobal('animation-direction'),
    animationFillMode: keyword('animation-fill-mode'),
    animationIterationCount: animationIterationCount,
    animationName: animationName,
    animationPlayState: keywordWithGlobal('animation-play-state'),
    backgroundAttachment: keyword('background-attachment'),
    backgroundClip: keywordWithGlobal('background-clip'),
    backgroundOrigin: keyword('background-origin'),
    backgroundPosition: backgroundPosition,
    backgroundRepeat: keyword('background-repeat'),
    backgroundSize: backgroundSize,
    bottom: unitOrKeywordWithGlobal('bottom'),
    borderCollapse: keyword('border-collapse'),
    borderStyle: keywordWithGlobal('*-style'),
    clear: keywordWithGlobal('clear'),
    cursor: keywordWithGlobal('cursor'),
    display: keywordWithGlobal('display'),
    float: keywordWithGlobal('float'),
    left: unitOrKeywordWithGlobal('left'),
    fontFamily: fontFamily,
    fontStretch: keywordWithGlobal('font-stretch'),
    fontStyle: keywordWithGlobal('font-style'),
    fontVariant: keywordWithGlobal('font-variant'),
    fontWeight: keywordWithGlobal('font-weight'),
    listStyleType: keywordWithGlobal('list-style-type'),
    listStylePosition: keywordWithGlobal('list-style-position'),
    outlineStyle: keywordWithGlobal('*-style'),
    overflow: keywordWithGlobal('overflow'),
    position: keywordWithGlobal('position'),
    right: unitOrKeywordWithGlobal('right'),
    textAlign: keywordWithGlobal('text-align'),
    textDecoration: keywordWithGlobal('text-decoration'),
    textOverflow: keywordWithGlobal('text-overflow'),
    textShadow: textShadow,
    top: unitOrKeywordWithGlobal('top'),
    transform: sameFunctionOrValue,
    verticalAlign: unitOrKeywordWithGlobal('vertical-align'),
    visibility: keywordWithGlobal('visibility'),
    whiteSpace: keywordWithGlobal('white-space'),
    zIndex: zIndex
  }
};

var wrapSingle$1 = wrapForOptimizing$3.single;

var Token$l = token;

function deep(property) {
  var cloned = shallow(property);
  for (var i = property.components.length - 1; i >= 0; i--) {
    var component = shallow(property.components[i]);
    component.value = property.components[i].value.slice(0);
    cloned.components.unshift(component);
  }

  cloned.dirty = true;
  cloned.value = property.value.slice(0);

  return cloned;
}

function shallow(property) {
  var cloned = wrapSingle$1([
    Token$l.PROPERTY,
    [Token$l.PROPERTY_NAME, property.name]
  ]);
  cloned.important = property.important;
  cloned.hack = property.hack;
  cloned.unused = false;
  return cloned;
}

var clone$1 = {
  deep: deep,
  shallow: shallow
};

var shallowClone$1 = clone$1.shallow;

var Token$k = token;
var Marker$b = marker;

function isInheritOnly(values) {
  for (var i = 0, l = values.length; i < l; i++) {
    var value = values[i][1];

    if (value != 'inherit' && value != Marker$b.COMMA && value != Marker$b.FORWARD_SLASH)
      return false;
  }

  return true;
}

function background$1(property, configuration, lastInMultiplex) {
  var components = property.components;
  var restored = [];
  var needsOne, needsBoth;

  function restoreValue(component) {
    Array.prototype.unshift.apply(restored, component.value);
  }

  function isDefaultValue(component) {
    var descriptor = configuration[component.name];

    if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
      return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] == descriptor.defaultValue[0] : true);
    } else if (descriptor.doubleValues && descriptor.defaultValue.length != 1) {
      return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] : component.value[0][1]) == descriptor.defaultValue[1];
    } else {
      return component.value[0][1] == descriptor.defaultValue;
    }
  }

  for (var i = components.length - 1; i >= 0; i--) {
    var component = components[i];
    var isDefault = isDefaultValue(component);

    if (component.name == 'background-clip') {
      var originComponent = components[i - 1];
      var isOriginDefault = isDefaultValue(originComponent);

      needsOne = component.value[0][1] == originComponent.value[0][1];

      needsBoth = !needsOne && (
        (isOriginDefault && !isDefault) ||
        (!isOriginDefault && !isDefault) ||
        (!isOriginDefault && isDefault && component.value[0][1] != originComponent.value[0][1]));

      if (needsOne) {
        restoreValue(originComponent);
      } else if (needsBoth) {
        restoreValue(component);
        restoreValue(originComponent);
      }

      i--;
    } else if (component.name == 'background-size') {
      var positionComponent = components[i - 1];
      var isPositionDefault = isDefaultValue(positionComponent);

      needsOne = !isPositionDefault && isDefault;

      needsBoth = !needsOne &&
        (isPositionDefault && !isDefault || !isPositionDefault && !isDefault);

      if (needsOne) {
        restoreValue(positionComponent);
      } else if (needsBoth) {
        restoreValue(component);
        restored.unshift([Token$k.PROPERTY_VALUE, Marker$b.FORWARD_SLASH]);
        restoreValue(positionComponent);
      } else if (positionComponent.value.length == 1) {
        restoreValue(positionComponent);
      }

      i--;
    } else {
      if (isDefault || configuration[component.name].multiplexLastOnly && !lastInMultiplex)
        continue;

      restoreValue(component);
    }
  }

  if (restored.length === 0 && property.value.length == 1 && property.value[0][1] == '0')
    restored.push(property.value[0]);

  if (restored.length === 0)
    restored.push([Token$k.PROPERTY_VALUE, configuration[property.name].defaultValue]);

  if (isInheritOnly(restored))
    return [restored[0]];

  return restored;
}

function borderRadius$1(property) {
  if (property.multiplex) {
    var horizontal = shallowClone$1(property);
    var vertical = shallowClone$1(property);

    for (var i = 0; i < 4; i++) {
      var component = property.components[i];

      var horizontalComponent = shallowClone$1(property);
      horizontalComponent.value = [component.value[0]];
      horizontal.components.push(horizontalComponent);

      var verticalComponent = shallowClone$1(property);
      // FIXME: only shorthand compactor (see breakup#borderRadius) knows that border radius
      // longhands have two values, whereas tokenizer does not care about populating 2nd value
      // if it's missing, hence this fallback
      verticalComponent.value = [component.value[1] || component.value[0]];
      vertical.components.push(verticalComponent);
    }

    var horizontalValues = fourValues(horizontal);
    var verticalValues = fourValues(vertical);

    if (horizontalValues.length == verticalValues.length &&
        horizontalValues[0][1] == verticalValues[0][1] &&
        (horizontalValues.length > 1 ? horizontalValues[1][1] == verticalValues[1][1] : true) &&
        (horizontalValues.length > 2 ? horizontalValues[2][1] == verticalValues[2][1] : true) &&
        (horizontalValues.length > 3 ? horizontalValues[3][1] == verticalValues[3][1] : true)) {
      return horizontalValues;
    } else {
      return horizontalValues.concat([[Token$k.PROPERTY_VALUE, Marker$b.FORWARD_SLASH]]).concat(verticalValues);
    }
  } else {
    return fourValues(property);
  }
}

function font(property, configuration) {
  var components = property.components;
  var restored = [];
  var component;
  var componentIndex = 0;
  var fontFamilyIndex = 0;

  if (property.value[0][1].indexOf(Marker$b.INTERNAL) === 0) {
    property.value[0][1] = property.value[0][1].substring(Marker$b.INTERNAL.length);
    return property.value;
  }

  // first four components are optional
  while (componentIndex < 4) {
    component = components[componentIndex];

    if (component.value[0][1] != configuration[component.name].defaultValue) {
      Array.prototype.push.apply(restored, component.value);
    }

    componentIndex++;
  }

  // then comes font-size
  Array.prototype.push.apply(restored, components[componentIndex].value);
  componentIndex++;

  // then may come line-height
  if (components[componentIndex].value[0][1] != configuration[components[componentIndex].name].defaultValue) {
    Array.prototype.push.apply(restored, [[Token$k.PROPERTY_VALUE, Marker$b.FORWARD_SLASH]]);
    Array.prototype.push.apply(restored, components[componentIndex].value);
  }

  componentIndex++;

  // then comes font-family
  while (components[componentIndex].value[fontFamilyIndex]) {
    restored.push(components[componentIndex].value[fontFamilyIndex]);

    if (components[componentIndex].value[fontFamilyIndex + 1]) {
      restored.push([Token$k.PROPERTY_VALUE, Marker$b.COMMA]);
    }

    fontFamilyIndex++;
  }

  if (isInheritOnly(restored)) {
    return [restored[0]];
  }

  return restored;
}

function fourValues(property) {
  var components = property.components;
  var value1 = components[0].value[0];
  var value2 = components[1].value[0];
  var value3 = components[2].value[0];
  var value4 = components[3].value[0];

  if (value1[1] == value2[1] && value1[1] == value3[1] && value1[1] == value4[1]) {
    return [value1];
  } else if (value1[1] == value3[1] && value2[1] == value4[1]) {
    return [value1, value2];
  } else if (value2[1] == value4[1]) {
    return [value1, value2, value3];
  } else {
    return [value1, value2, value3, value4];
  }
}

function multiplex(restoreWith) {
  return function (property, configuration) {
    if (!property.multiplex)
      return restoreWith(property, configuration, true);

    var multiplexSize = 0;
    var restored = [];
    var componentMultiplexSoFar = {};
    var i, l;

    // At this point we don't know what's the multiplex size, e.g. how many background layers are there
    for (i = 0, l = property.components[0].value.length; i < l; i++) {
      if (property.components[0].value[i][1] == Marker$b.COMMA)
        multiplexSize++;
    }

    for (i = 0; i <= multiplexSize; i++) {
      var _property = shallowClone$1(property);

      // We split multiplex into parts and restore them one by one
      for (var j = 0, m = property.components.length; j < m; j++) {
        var componentToClone = property.components[j];
        var _component = shallowClone$1(componentToClone);
        _property.components.push(_component);

        // The trick is some properties has more than one value, so we iterate over values looking for
        // a multiplex separator - a comma
        for (var k = componentMultiplexSoFar[_component.name] || 0, n = componentToClone.value.length; k < n; k++) {
          if (componentToClone.value[k][1] == Marker$b.COMMA) {
            componentMultiplexSoFar[_component.name] = k + 1;
            break;
          }

          _component.value.push(componentToClone.value[k]);
        }
      }

      // No we can restore shorthand value
      var lastInMultiplex = i == multiplexSize;
      var _restored = restoreWith(_property, configuration, lastInMultiplex);
      Array.prototype.push.apply(restored, _restored);

      if (i < multiplexSize)
        restored.push([Token$k.PROPERTY_VALUE, Marker$b.COMMA]);
    }

    return restored;
  };
}

function withoutDefaults(property, configuration) {
  var components = property.components;
  var restored = [];

  for (var i = components.length - 1; i >= 0; i--) {
    var component = components[i];
    var descriptor = configuration[component.name];

    if (component.value[0][1] != descriptor.defaultValue || ('keepUnlessDefault' in descriptor) && !isDefault(components, configuration, descriptor.keepUnlessDefault)) {
      restored.unshift(component.value[0]);
    }
  }

  if (restored.length === 0)
    restored.push([Token$k.PROPERTY_VALUE, configuration[property.name].defaultValue]);

  if (isInheritOnly(restored))
    return [restored[0]];

  return restored;
}

function isDefault(components, configuration, propertyName) {
  var component;
  var i, l;

  for (i = 0, l = components.length; i < l; i++) {
    component = components[i];

    if (component.name == propertyName && component.value[0][1] == configuration[propertyName].defaultValue) {
      return true;
    }
  }

  return false;
}

var restore$1 = {
  background: background$1,
  borderRadius: borderRadius$1,
  font: font,
  fourValues: fourValues,
  multiplex: multiplex,
  withoutDefaults: withoutDefaults
};

var override$5 = override_1;

var INTEGER_PATTERN = /^\d+$/;

var ALL_UNITS = ['*', 'all'];
var DEFAULT_PRECISION = 'off'; // all precision changes are disabled
var DIRECTIVES_SEPARATOR = ','; // e.g. *=5,px=3
var DIRECTIVE_VALUE_SEPARATOR = '='; // e.g. *=5

function roundingPrecisionFrom$1(source) {
  return override$5(defaults$2(DEFAULT_PRECISION), buildPrecisionFrom(source));
}

function defaults$2(value) {
  return {
    'ch': value,
    'cm': value,
    'em': value,
    'ex': value,
    'in': value,
    'mm': value,
    'pc': value,
    'pt': value,
    'px': value,
    'q': value,
    'rem': value,
    'vh': value,
    'vmax': value,
    'vmin': value,
    'vw': value,
    '%': value
  };
}

function buildPrecisionFrom(source) {
  if (source === null || source === undefined) {
    return {};
  }

  if (typeof source == 'boolean') {
    return {};
  }

  if (typeof source == 'number' && source == -1) {
    return defaults$2(DEFAULT_PRECISION);
  }

  if (typeof source == 'number') {
    return defaults$2(source);
  }

  if (typeof source == 'string' && INTEGER_PATTERN.test(source)) {
    return defaults$2(parseInt(source));
  }

  if (typeof source == 'string' && source == DEFAULT_PRECISION) {
    return defaults$2(DEFAULT_PRECISION);
  }

  if (typeof source == 'object') {
    return source;
  }

  return source
    .split(DIRECTIVES_SEPARATOR)
    .reduce(function (accumulator, directive) {
      var directiveParts = directive.split(DIRECTIVE_VALUE_SEPARATOR);
      var name = directiveParts[0];
      var value = parseInt(directiveParts[1]);

      if (isNaN(value) || value == -1) {
        value = DEFAULT_PRECISION;
      }

      if (ALL_UNITS.indexOf(name) > -1) {
        accumulator = override$5(accumulator, defaults$2(value));
      } else {
        accumulator[name] = value;
      }

      return accumulator;
    }, {});
}

var roundingPrecision = {
  DEFAULT: DEFAULT_PRECISION,
  roundingPrecisionFrom: roundingPrecisionFrom$1
};

var roundingPrecisionFrom = roundingPrecision.roundingPrecisionFrom;

var override$4 = override_1;

var OptimizationLevel$j = {
  Zero: '0',
  One: '1',
  Two: '2'
};

var DEFAULTS$1 = {};

DEFAULTS$1[OptimizationLevel$j.Zero] = {};
DEFAULTS$1[OptimizationLevel$j.One] = {
  cleanupCharsets: true,
  normalizeUrls: true,
  optimizeBackground: true,
  optimizeBorderRadius: true,
  optimizeFilter: true,
  optimizeFontWeight: true,
  optimizeOutline: true,
  removeEmpty: true,
  removeNegativePaddings: true,
  removeQuotes: true,
  removeWhitespace: true,
  replaceMultipleZeros: true,
  replaceTimeUnits: true,
  replaceZeroUnits: true,
  roundingPrecision: roundingPrecisionFrom(undefined),
  selectorsSortingMethod: 'standard',
  specialComments: 'all',
  tidyAtRules: true,
  tidyBlockScopes: true,
  tidySelectors: true
};
DEFAULTS$1[OptimizationLevel$j.Two] = {
  mergeAdjacentRules: true,
  mergeIntoShorthands: true,
  mergeMedia: true,
  mergeNonAdjacentRules: true,
  mergeSemantically: false,
  overrideProperties: true,
  removeEmpty: true,
  reduceNonAdjacentRules: true,
  removeDuplicateFontRules: true,
  removeDuplicateMediaBlocks: true,
  removeDuplicateRules: true,
  removeUnusedAtRules: false,
  restructureRules: false,
  skipProperties: []
};

var ALL_KEYWORD_1 = '*';
var ALL_KEYWORD_2 = 'all';
var FALSE_KEYWORD_1 = 'false';
var FALSE_KEYWORD_2 = 'off';
var TRUE_KEYWORD_1 = 'true';
var TRUE_KEYWORD_2 = 'on';

var LIST_VALUE_SEPARATOR = ',';
var OPTION_SEPARATOR = ';';
var OPTION_VALUE_SEPARATOR = ':';

function optimizationLevelFrom$1(source) {
  var level = override$4(DEFAULTS$1, {});
  var Zero = OptimizationLevel$j.Zero;
  var One = OptimizationLevel$j.One;
  var Two = OptimizationLevel$j.Two;

  if (undefined === source) {
    delete level[Two];
    return level;
  }

  if (typeof source == 'string') {
    source = parseInt(source);
  }

  if (typeof source == 'number' && source === parseInt(Two)) {
    return level;
  }

  if (typeof source == 'number' && source === parseInt(One)) {
    delete level[Two];
    return level;
  }

  if (typeof source == 'number' && source === parseInt(Zero)) {
    delete level[Two];
    delete level[One];
    return level;
  }

  if (typeof source == 'object') {
    source = covertValuesToHashes(source);
  }

  if (One in source && 'roundingPrecision' in source[One]) {
    source[One].roundingPrecision = roundingPrecisionFrom(source[One].roundingPrecision);
  }

  if (Two in source && 'skipProperties' in source[Two] && typeof(source[Two].skipProperties) == 'string') {
    source[Two].skipProperties = source[Two].skipProperties.split(LIST_VALUE_SEPARATOR);
  }

  if (Zero in source || One in source || Two in source) {
    level[Zero] = override$4(level[Zero], source[Zero]);
  }

  if (One in source && ALL_KEYWORD_1 in source[One]) {
    level[One] = override$4(level[One], defaults$1(One, normalizeValue(source[One][ALL_KEYWORD_1])));
    delete source[One][ALL_KEYWORD_1];
  }

  if (One in source && ALL_KEYWORD_2 in source[One]) {
    level[One] = override$4(level[One], defaults$1(One, normalizeValue(source[One][ALL_KEYWORD_2])));
    delete source[One][ALL_KEYWORD_2];
  }

  if (One in source || Two in source) {
    level[One] = override$4(level[One], source[One]);
  } else {
    delete level[One];
  }

  if (Two in source && ALL_KEYWORD_1 in source[Two]) {
    level[Two] = override$4(level[Two], defaults$1(Two, normalizeValue(source[Two][ALL_KEYWORD_1])));
    delete source[Two][ALL_KEYWORD_1];
  }

  if (Two in source && ALL_KEYWORD_2 in source[Two]) {
    level[Two] = override$4(level[Two], defaults$1(Two, normalizeValue(source[Two][ALL_KEYWORD_2])));
    delete source[Two][ALL_KEYWORD_2];
  }

  if (Two in source) {
    level[Two] = override$4(level[Two], source[Two]);
  } else {
    delete level[Two];
  }

  return level;
}

function defaults$1(level, value) {
  var options = override$4(DEFAULTS$1[level], {});
  var key;

  for (key in options) {
    if (typeof options[key] == 'boolean') {
      options[key] = value;
    }
  }

  return options;
}

function normalizeValue(value) {
  switch (value) {
    case FALSE_KEYWORD_1:
    case FALSE_KEYWORD_2:
      return false;
    case TRUE_KEYWORD_1:
    case TRUE_KEYWORD_2:
      return true;
    default:
      return value;
  }
}

function covertValuesToHashes(source) {
  var clonedSource = override$4(source, {});
  var level;
  var i;

  for (i = 0; i <= 2; i++) {
    level = '' + i;

    if (level in clonedSource && (clonedSource[level] === undefined || clonedSource[level] === false)) {
      delete clonedSource[level];
    }

    if (level in clonedSource && clonedSource[level] === true) {
      clonedSource[level] = {};
    }

    if (level in clonedSource && typeof clonedSource[level] == 'string') {
      clonedSource[level] = covertToHash(clonedSource[level], level);
    }
  }

  return clonedSource;
}

function covertToHash(asString, level) {
  return asString
    .split(OPTION_SEPARATOR)
    .reduce(function (accumulator, directive) {
      var parts = directive.split(OPTION_VALUE_SEPARATOR);
      var name = parts[0];
      var value = parts[1];
      var normalizedValue = normalizeValue(value);

      if (ALL_KEYWORD_1 == name || ALL_KEYWORD_2 == name) {
        accumulator = override$4(accumulator, defaults$1(level, normalizedValue));
      } else {
        accumulator[name] = normalizedValue;
      }

      return accumulator;
    }, {});
}

var optimizationLevel = {
  OptimizationLevel: OptimizationLevel$j,
  optimizationLevelFrom: optimizationLevelFrom$1,
};

var OptimizationLevel$i = optimizationLevel.OptimizationLevel;

var plugin$j = {
  level1: {
    property: function background(_rule, property, options) {
      var values = property.value;

      if (!options.level[OptimizationLevel$i.One].optimizeBackground) {
        return;
      }

      if (values.length == 1 && values[0][1] == 'none') {
        values[0][1] = '0 0';
      }

      if (values.length == 1 && values[0][1] == 'transparent') {
        values[0][1] = '0 0';
      }
    }
  }
};

var background = plugin$j;

var plugin$i = {
  level1: {
    property: function boxShadow(_rule, property) {
      var values = property.value;

      // remove multiple zeros
      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
        property.value.splice(2);
        property.dirty = true;
      }
    }
  }
};

var boxShadow = plugin$i;

var OptimizationLevel$h = optimizationLevel.OptimizationLevel;

var plugin$h = {
  level1: {
    property: function borderRadius(_rule, property, options) {
      var values = property.value;

      if (!options.level[OptimizationLevel$h.One].optimizeBorderRadius) {
        return;
      }

      if (values.length == 3 && values[1][1] == '/' && values[0][1] == values[2][1]) {
        property.value.splice(1);
        property.dirty = true;
      } else if (values.length == 5 && values[2][1] == '/' && values[0][1] == values[3][1] && values[1][1] == values[4][1]) {
        property.value.splice(2);
        property.dirty = true;
      } else if (values.length == 7 && values[3][1] == '/' && values[0][1] == values[4][1] && values[1][1] == values[5][1] && values[2][1] == values[6][1]) {
        property.value.splice(3);
        property.dirty = true;
      } else if (values.length == 9 && values[4][1] == '/' && values[0][1] == values[5][1] && values[1][1] == values[6][1] && values[2][1] == values[7][1] && values[3][1] == values[8][1]) {
        property.value.splice(4);
        property.dirty = true;
      }
    }
  }
};

var borderRadius = plugin$h;

var OptimizationLevel$g = optimizationLevel.OptimizationLevel;

var ALPHA_OR_CHROMA_FILTER_PATTERN = /progid:DXImageTransform\.Microsoft\.(Alpha|Chroma)(\W)/;
var NO_SPACE_AFTER_COMMA_PATTERN = /,(\S)/g;
var WHITESPACE_AROUND_EQUALS_PATTERN = / ?= ?/g;

var plugin$g = {
  level1: {
    property: function filter(_rule, property, options) {
      if (!options.compatibility.properties.ieFilters) {
        return;
      }

      if (!options.level[OptimizationLevel$g.One].optimizeFilter) {
        return;
      }

      if (property.value.length == 1) {
        property.value[0][1] = property.value[0][1].replace(ALPHA_OR_CHROMA_FILTER_PATTERN, function (match, filter, suffix) {
          return filter.toLowerCase() + suffix;
        });
      }

      property.value[0][1] = property.value[0][1]
        .replace(NO_SPACE_AFTER_COMMA_PATTERN, ', $1')
        .replace(WHITESPACE_AROUND_EQUALS_PATTERN, '=');
    }
  }
};

var filter$1 = plugin$g;

var OptimizationLevel$f = optimizationLevel.OptimizationLevel;

var plugin$f = {
  level1: {
    property: function fontWeight(_rule, property, options) {
      var value = property.value[0][1];

      if (!options.level[OptimizationLevel$f.One].optimizeFontWeight) {
        return;
      }

      if (value == 'normal') {
        value = '400';
      } else if (value == 'bold') {
        value = '700';
      }

      property.value[0][1] = value;
    }
  }
};

var fontWeight = plugin$f;

var OptimizationLevel$e = optimizationLevel.OptimizationLevel;

var plugin$e = {
  level1: {
    property: function margin(_rule, property, options) {
      var values = property.value;

      if (!options.level[OptimizationLevel$e.One].replaceMultipleZeros) {
        return;
      }

      // remove multiple zeros
      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
        property.value.splice(1);
        property.dirty = true;
      }
    }
  }
};

var margin = plugin$e;

var OptimizationLevel$d = optimizationLevel.OptimizationLevel;

var plugin$d = {
  level1: {
    property: function outline(_rule, property, options) {
      var values = property.value;

      if (!options.level[OptimizationLevel$d.One].optimizeOutline) {
        return;
      }

      if (values.length == 1 && values[0][1] == 'none') {
        values[0][1] = '0';
      }
    }
  }
};

var outline = plugin$d;

var OptimizationLevel$c = optimizationLevel.OptimizationLevel;

function isNegative(value) {
  return value && value[1][0] == '-' && parseFloat(value[1]) < 0;
}

var plugin$c = {
  level1: {
    property: function padding(_rule, property, options) {
      var values = property.value;

      // remove multiple zeros
      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
        property.value.splice(1);
        property.dirty = true;
      }

      // remove negative paddings
      if (options.level[OptimizationLevel$c.One].removeNegativePaddings && (isNegative(property.value[0]) || isNegative(property.value[1]) || isNegative(property.value[2]) || isNegative(property.value[3]))) {
        property.unused = true;
      }
    }
  }
};

var padding = plugin$c;

var propertyOptimizers$1 = {
  background: background.level1.property,
  boxShadow: boxShadow.level1.property,
  borderRadius: borderRadius.level1.property,
  filter: filter$1.level1.property,
  fontWeight: fontWeight.level1.property,
  margin: margin.level1.property,
  outline: outline.level1.property,
  padding: padding.level1.property
};

var COLORS = {
  aliceblue: '#f0f8ff',
  antiquewhite: '#faebd7',
  aqua: '#0ff',
  aquamarine: '#7fffd4',
  azure: '#f0ffff',
  beige: '#f5f5dc',
  bisque: '#ffe4c4',
  black: '#000',
  blanchedalmond: '#ffebcd',
  blue: '#00f',
  blueviolet: '#8a2be2',
  brown: '#a52a2a',
  burlywood: '#deb887',
  cadetblue: '#5f9ea0',
  chartreuse: '#7fff00',
  chocolate: '#d2691e',
  coral: '#ff7f50',
  cornflowerblue: '#6495ed',
  cornsilk: '#fff8dc',
  crimson: '#dc143c',
  cyan: '#0ff',
  darkblue: '#00008b',
  darkcyan: '#008b8b',
  darkgoldenrod: '#b8860b',
  darkgray: '#a9a9a9',
  darkgreen: '#006400',
  darkgrey: '#a9a9a9',
  darkkhaki: '#bdb76b',
  darkmagenta: '#8b008b',
  darkolivegreen: '#556b2f',
  darkorange: '#ff8c00',
  darkorchid: '#9932cc',
  darkred: '#8b0000',
  darksalmon: '#e9967a',
  darkseagreen: '#8fbc8f',
  darkslateblue: '#483d8b',
  darkslategray: '#2f4f4f',
  darkslategrey: '#2f4f4f',
  darkturquoise: '#00ced1',
  darkviolet: '#9400d3',
  deeppink: '#ff1493',
  deepskyblue: '#00bfff',
  dimgray: '#696969',
  dimgrey: '#696969',
  dodgerblue: '#1e90ff',
  firebrick: '#b22222',
  floralwhite: '#fffaf0',
  forestgreen: '#228b22',
  fuchsia: '#f0f',
  gainsboro: '#dcdcdc',
  ghostwhite: '#f8f8ff',
  gold: '#ffd700',
  goldenrod: '#daa520',
  gray: '#808080',
  green: '#008000',
  greenyellow: '#adff2f',
  grey: '#808080',
  honeydew: '#f0fff0',
  hotpink: '#ff69b4',
  indianred: '#cd5c5c',
  indigo: '#4b0082',
  ivory: '#fffff0',
  khaki: '#f0e68c',
  lavender: '#e6e6fa',
  lavenderblush: '#fff0f5',
  lawngreen: '#7cfc00',
  lemonchiffon: '#fffacd',
  lightblue: '#add8e6',
  lightcoral: '#f08080',
  lightcyan: '#e0ffff',
  lightgoldenrodyellow: '#fafad2',
  lightgray: '#d3d3d3',
  lightgreen: '#90ee90',
  lightgrey: '#d3d3d3',
  lightpink: '#ffb6c1',
  lightsalmon: '#ffa07a',
  lightseagreen: '#20b2aa',
  lightskyblue: '#87cefa',
  lightslategray: '#778899',
  lightslategrey: '#778899',
  lightsteelblue: '#b0c4de',
  lightyellow: '#ffffe0',
  lime: '#0f0',
  limegreen: '#32cd32',
  linen: '#faf0e6',
  magenta: '#ff00ff',
  maroon: '#800000',
  mediumaquamarine: '#66cdaa',
  mediumblue: '#0000cd',
  mediumorchid: '#ba55d3',
  mediumpurple: '#9370db',
  mediumseagreen: '#3cb371',
  mediumslateblue: '#7b68ee',
  mediumspringgreen: '#00fa9a',
  mediumturquoise: '#48d1cc',
  mediumvioletred: '#c71585',
  midnightblue: '#191970',
  mintcream: '#f5fffa',
  mistyrose: '#ffe4e1',
  moccasin: '#ffe4b5',
  navajowhite: '#ffdead',
  navy: '#000080',
  oldlace: '#fdf5e6',
  olive: '#808000',
  olivedrab: '#6b8e23',
  orange: '#ffa500',
  orangered: '#ff4500',
  orchid: '#da70d6',
  palegoldenrod: '#eee8aa',
  palegreen: '#98fb98',
  paleturquoise: '#afeeee',
  palevioletred: '#db7093',
  papayawhip: '#ffefd5',
  peachpuff: '#ffdab9',
  peru: '#cd853f',
  pink: '#ffc0cb',
  plum: '#dda0dd',
  powderblue: '#b0e0e6',
  purple: '#800080',
  rebeccapurple: '#663399',
  red: '#f00',
  rosybrown: '#bc8f8f',
  royalblue: '#4169e1',
  saddlebrown: '#8b4513',
  salmon: '#fa8072',
  sandybrown: '#f4a460',
  seagreen: '#2e8b57',
  seashell: '#fff5ee',
  sienna: '#a0522d',
  silver: '#c0c0c0',
  skyblue: '#87ceeb',
  slateblue: '#6a5acd',
  slategray: '#708090',
  slategrey: '#708090',
  snow: '#fffafa',
  springgreen: '#00ff7f',
  steelblue: '#4682b4',
  tan: '#d2b48c',
  teal: '#008080',
  thistle: '#d8bfd8',
  tomato: '#ff6347',
  turquoise: '#40e0d0',
  violet: '#ee82ee',
  wheat: '#f5deb3',
  white: '#fff',
  whitesmoke: '#f5f5f5',
  yellow: '#ff0',
  yellowgreen: '#9acd32'
};

var toHex$1 = {};
var toName = {};

for (var name in COLORS) {
  var hex = COLORS[name];

  if (name.length < hex.length) {
    toName[hex] = name;
  } else {
    toHex$1[name] = hex;
  }
}

var toHexPattern = new RegExp('(^| |,|\\))(' + Object.keys(toHex$1).join('|') + ')( |,|\\)|$)', 'ig');
var toNamePattern = new RegExp('(' + Object.keys(toName).join('|') + ')([^a-f0-9]|$)', 'ig');

function hexConverter(match, prefix, colorValue, suffix) {
  return prefix + toHex$1[colorValue.toLowerCase()] + suffix;
}

function nameConverter(match, colorValue, suffix) {
  return toName[colorValue.toLowerCase()] + suffix;
}

function shortenHex$1(value) {
  var hasHex = value.indexOf('#') > -1;
  var shortened = value.replace(toHexPattern, hexConverter);

  if (shortened != value) {
    shortened = shortened.replace(toHexPattern, hexConverter);
  }

  return hasHex ?
    shortened.replace(toNamePattern, nameConverter) :
    shortened;
}

var shortenHex_1 = shortenHex$1;

// HSL to RGB converter. Both methods adapted from:
// http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript

function hslToRgb(h, s, l) {
  var r, g, b;

  // normalize hue orientation b/w 0 and 360 degrees
  h = h % 360;
  if (h < 0)
    h += 360;
  h = ~~h / 360;

  if (s < 0)
    s = 0;
  else if (s > 100)
    s = 100;
  s = ~~s / 100;

  if (l < 0)
    l = 0;
  else if (l > 100)
    l = 100;
  l = ~~l / 100;

  if (s === 0) {
    r = g = b = l; // achromatic
  } else {
    var q = l < 0.5 ?
      l * (1 + s) :
      l + s - l * s;
    var p = 2 * l - q;
    r = hueToRgb(p, q, h + 1/3);
    g = hueToRgb(p, q, h);
    b = hueToRgb(p, q, h - 1/3);
  }

  return [~~(r * 255), ~~(g * 255), ~~(b * 255)];
}

function hueToRgb(p, q, t) {
  if (t < 0) t += 1;
  if (t > 1) t -= 1;
  if (t < 1/6) return p + (q - p) * 6 * t;
  if (t < 1/2) return q;
  if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
  return p;
}

function shortenHsl$1(hue, saturation, lightness) {
  var asRgb = hslToRgb(hue, saturation, lightness);
  var redAsHex = asRgb[0].toString(16);
  var greenAsHex = asRgb[1].toString(16);
  var blueAsHex = asRgb[2].toString(16);

  return '#' +
    ((redAsHex.length == 1 ? '0' : '') + redAsHex) +
    ((greenAsHex.length == 1 ? '0' : '') + greenAsHex) +
    ((blueAsHex.length == 1 ? '0' : '') + blueAsHex);
}

var shortenHsl_1 = shortenHsl$1;

function shortenRgb$1(red, green, blue) {
  var normalizedRed = Math.max(0, Math.min(parseInt(red), 255));
  var normalizedGreen = Math.max(0, Math.min(parseInt(green), 255));
  var normalizedBlue = Math.max(0, Math.min(parseInt(blue), 255));

  // Credit: Asen  http://jsbin.com/UPUmaGOc/2/edit?js,console
  return '#' + ('00000' + (normalizedRed << 16 | normalizedGreen << 8 | normalizedBlue).toString(16)).slice(-6);
}

var shortenRgb_1 = shortenRgb$1;

var Marker$a = marker;

function is(value, separator, isSeparatorRegex) {
  return isSeparatorRegex ?
    separator.test(value) :
    value === separator;
}

function split$4(value, separator) {
  var openLevel = Marker$a.OPEN_ROUND_BRACKET;
  var closeLevel = Marker$a.CLOSE_ROUND_BRACKET;
  var level = 0;
  var cursor = 0;
  var lastStart = 0;
  var lastValue;
  var lastCharacter;
  var len = value.length;
  var parts = [];
  var isSeparatorRegex = typeof(separator) == 'object' && 'exec' in separator;

  if (!isSeparatorRegex && value.indexOf(separator) == -1) {
    return [value];
  }

  if (value.indexOf(openLevel) == -1) {
    return value.split(separator);
  }

  while (cursor < len) {
    if (value[cursor] == openLevel) {
      level++;
    } else if (value[cursor] == closeLevel) {
      level--;
    }

    if (level === 0 && cursor > 0 && cursor + 1 < len && is(value[cursor], separator, isSeparatorRegex)) {
      parts.push(value.substring(lastStart, cursor));

      if (isSeparatorRegex && separator.exec(value[cursor]).length > 1) {
        parts.push(value[cursor]);
      }

      lastStart = cursor + 1;
    }

    cursor++;
  }

  if (lastStart < cursor + 1) {
    lastValue = value.substring(lastStart);
    lastCharacter = lastValue[lastValue.length - 1];
    if (is(lastCharacter, separator, isSeparatorRegex)) {
      lastValue = lastValue.substring(0, lastValue.length - 1);
    }

    parts.push(lastValue);
  }

  return parts;
}

var split_1 = split$4;

var shortenHex = shortenHex_1;
var shortenHsl = shortenHsl_1;
var shortenRgb = shortenRgb_1;

var split$3 = split_1;

var ANY_COLOR_FUNCTION_PATTERN = /(rgb|rgba|hsl|hsla)\(([^\(\)]+)\)/gi;
var COLOR_PREFIX_PATTERN = /#|rgb|hsl/gi;
var HEX_LONG_PATTERN = /(^|[^='"])#([0-9a-f]{6})/gi;
var HEX_SHORT_PATTERN = /(^|[^='"])#([0-9a-f]{3})/gi;
var HEX_VALUE_PATTERN = /[0-9a-f]/i;
var HSL_PATTERN = /hsl\((-?\d+),(-?\d+)%?,(-?\d+)%?\)/gi;
var RGBA_HSLA_PATTERN = /(rgb|hsl)a?\((\-?\d+),(\-?\d+\%?),(\-?\d+\%?),(0*[1-9]+[0-9]*(\.?\d*)?)\)/gi;
var RGB_PATTERN = /rgb\((\-?\d+),(\-?\d+),(\-?\d+)\)/gi;
var TRANSPARENT_FUNCTION_PATTERN = /(?:rgba|hsla)\(0,0%?,0%?,0\)/g;

var plugin$b = {
  level1: {
    value: function color(name, value, options) {
      if (!options.compatibility.properties.colors) {
        return value;
      }

      if (!value.match(COLOR_PREFIX_PATTERN)) {
        return shortenHex(value);
      }

      value = value
        .replace(RGBA_HSLA_PATTERN, function (match, colorFn, p1, p2, p3, alpha) {
          return (parseInt(alpha, 10) >= 1 ? colorFn + '(' + [p1,p2,p3].join(',') + ')' : match);
        })
        .replace(RGB_PATTERN, function (match, red, green, blue) {
          return shortenRgb(red, green, blue);
        })
        .replace(HSL_PATTERN, function (match, hue, saturation, lightness) {
          return shortenHsl(hue, saturation, lightness);
        })
        .replace(HEX_LONG_PATTERN, function (match, prefix, color, at, inputValue) {
          var suffix = inputValue[at + match.length];

          if (suffix && HEX_VALUE_PATTERN.test(suffix)) {
            return match;
          } else if (color[0] == color[1] && color[2] == color[3] && color[4] == color[5]) {
            return (prefix + '#' + color[0] + color[2] + color[4]).toLowerCase();
          } else {
            return (prefix + '#' + color).toLowerCase();
          }
        })
        .replace(HEX_SHORT_PATTERN, function (match, prefix, color) {
          return prefix + '#' + color.toLowerCase();
        })
        .replace(ANY_COLOR_FUNCTION_PATTERN, function (match, colorFunction, colorDef) {
          var tokens = colorDef.split(',');
          var colorFnLowercase = colorFunction && colorFunction.toLowerCase();
          var applies = (colorFnLowercase == 'hsl' && tokens.length == 3) ||
            (colorFnLowercase == 'hsla' && tokens.length == 4) ||
            (colorFnLowercase == 'rgb' && tokens.length === 3 && colorDef.indexOf('%') > 0) ||
            (colorFnLowercase == 'rgba' && tokens.length == 4 && colorDef.indexOf('%') > 0);

          if (!applies) {
            return match;
          }

          if (tokens[1].indexOf('%') == -1) {
            tokens[1] += '%';
          }

          if (tokens[2].indexOf('%') == -1) {
            tokens[2] += '%';
          }

          return colorFunction + '(' + tokens.join(',') + ')';
        });

      if (options.compatibility.colors.opacity && name.indexOf('background') == -1) {
        value = value.replace(TRANSPARENT_FUNCTION_PATTERN, function (match) {
          if (split$3(value, ',').pop().indexOf('gradient(') > -1) {
            return match;
          }

          return 'transparent';
        });
      }

      return shortenHex(value);
    }
  }
};

var color = plugin$b;

var ZERO_DEG_PATTERN = /\(0deg\)/g;

var plugin$a = {
  level1: {
    value: function degrees(_name, value, options) {
      if (!options.compatibility.properties.zeroUnits) {
        return value;
      }

      if (value.indexOf('0deg') == -1) {
        return value;
      }

      return value.replace(ZERO_DEG_PATTERN, '(0)');
    }
  }
};

var degrees = plugin$a;

var URL_PREFIX_PATTERN$4 = /^url\(/i;

function startsAsUrl$4(value) {
  return URL_PREFIX_PATTERN$4.test(value);
}

var startsAsUrl_1 = startsAsUrl$4;

var startsAsUrl$3 = startsAsUrl_1;

var OptimizationLevel$b = optimizationLevel.OptimizationLevel;

var DOT_ZERO_PATTERN = /(^|\D)\.0+(\D|$)/g;
var FRACTION_PATTERN = /\.([1-9]*)0+(\D|$)/g;
var LEADING_ZERO_FRACTION_PATTERN = /(^|\D)0\.(\d)/g;
var MINUS_ZERO_FRACTION_PATTERN = /([^\w\d\-]|^)\-0([^\.]|$)/g;
var ZERO_PREFIXED_UNIT_PATTERN = /(^|\s)0+([1-9])/g;

var plugin$9 = {
  level1: {
    value: function fraction(name, value, options) {
      if (!options.level[OptimizationLevel$b.One].replaceZeroUnits) {
        return value;
      }

      if (startsAsUrl$3(value)) {
        return value;
      }

      if (value.indexOf('0') == -1) {
        return value;
      }

      if (value.indexOf('-') > -1) {
        value = value
          .replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2')
          .replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2');
      }

      return value
        .replace(ZERO_PREFIXED_UNIT_PATTERN, '$1$2')
        .replace(DOT_ZERO_PATTERN, '$10$2')
        .replace(FRACTION_PATTERN, function (match, nonZeroPart, suffix) {
          return (nonZeroPart.length > 0 ? '.' : '') + nonZeroPart + suffix;
        })
        .replace(LEADING_ZERO_FRACTION_PATTERN, '$1.$2');
    }
  }
};

var fraction = plugin$9;

var plugin$8 = {
  level1: {
    value: function precision(_name, value, options) {
      if (!options.precision.enabled || value.indexOf('.') === -1) {
        return value;
      }

      return value
        .replace(options.precision.decimalPointMatcher, '$1$2$3')
        .replace(options.precision.zeroMatcher, function (match, integerPart, fractionPart, unit) {
          var multiplier = options.precision.units[unit].multiplier;
          var parsedInteger = parseInt(integerPart);
          var integer = isNaN(parsedInteger) ? 0 : parsedInteger;
          var fraction = parseFloat(fractionPart);

          return Math.round((integer + fraction) * multiplier) / multiplier + unit;
        });
    }
  }
};

var precision = plugin$8;

var OptimizationLevel$a = optimizationLevel.OptimizationLevel;

var LOCAL_PREFIX_PATTERN = /^local\(/i;
var QUOTED_PATTERN = /^('.*'|".*")$/;
var QUOTED_BUT_SAFE_PATTERN = /^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/;

var plugin$7 = {
  level1: {
    value: function textQuotes(_name, value, options) {
      if (!options.level[OptimizationLevel$a.One].removeQuotes) {
        return value;
      }

      if (!QUOTED_PATTERN.test(value) && !LOCAL_PREFIX_PATTERN.test(value)) {
        return value;
      }

      return QUOTED_BUT_SAFE_PATTERN.test(value) ?
        value.substring(1, value.length - 1) :
        value;
    }
  }
};

var textQuotes = plugin$7;

var OptimizationLevel$9 = optimizationLevel.OptimizationLevel;

var TIME_VALUE = /^(\-?[\d\.]+)(m?s)$/;

var plugin$6 = {
  level1: {
    value: function time(name, value, options) {
      if (!options.level[OptimizationLevel$9.One].replaceTimeUnits) {
        return value;
      }

      if (!TIME_VALUE.test(value)) {
        return value;
      }

      return value.replace(TIME_VALUE, function (match, val, unit) {
        var newValue;

        if (unit == 'ms') {
          newValue = parseInt(val) / 1000 + 's';
        } else if (unit == 's') {
          newValue = parseFloat(val) * 1000 + 'ms';
        }

        return newValue.length < match.length ? newValue : match;
      });
    }
  }
};

var time = plugin$6;

var WHOLE_PIXEL_VALUE = /(?:^|\s|\()(-?\d+)px/;

var plugin$5 = {
  level1: {
    value: function unit(_name, value, options) {
      if (!WHOLE_PIXEL_VALUE.test(value)) {
        return value;
      }

      return value.replace(WHOLE_PIXEL_VALUE, function (match, val) {
        var newValue;
        var intVal = parseInt(val);

        if (intVal === 0) {
          return match;
        }

        if (options.compatibility.properties.shorterLengthUnits && options.compatibility.units.pt && intVal * 3 % 4 === 0) {
          newValue = intVal * 3 / 4 + 'pt';
        }

        if (options.compatibility.properties.shorterLengthUnits && options.compatibility.units.pc && intVal % 16 === 0) {
          newValue = intVal / 16 + 'pc';
        }

        if (options.compatibility.properties.shorterLengthUnits && options.compatibility.units.in && intVal % 96 === 0) {
          newValue = intVal / 96 + 'in';
        }

        if (newValue) {
          newValue = match.substring(0, match.indexOf(val)) + newValue;
        }

        return newValue && newValue.length < match.length ? newValue : match;
      });
    }
  }
};

var unit = plugin$5;

var startsAsUrl$2 = startsAsUrl_1;

var OptimizationLevel$8 = optimizationLevel.OptimizationLevel;

var URL_PREFIX_PATTERN$3 = /^url\(/i;

var plugin$4 = {
  level1: {
    value: function urlPrefix(_name, value, options) {
      if (!options.level[OptimizationLevel$8.One].normalizeUrls) {
        return value;
      }

      if (!startsAsUrl$2(value)) {
        return value;
      }

      return value.replace(URL_PREFIX_PATTERN$3, 'url(');
    }
  }
};

var urlPrefix = plugin$4;

var QUOTED_URL_PATTERN = /^url\(['"].+['"]\)$/;
var QUOTED_URL_WITH_WHITESPACE_PATTERN = /^url\(['"].*[\*\s\(\)'"].*['"]\)$/;
var QUOTES_PATTERN = /["']/g;
var URL_DATA_PATTERN = /^url\(['"]data:[^;]+;charset/;

var plugin$3 = {
  level1: {
    value: function urlQuotes(_name, value, options) {
      if (options.compatibility.properties.urlQuotes) {
        return value;
      }

      return QUOTED_URL_PATTERN.test(value) && !QUOTED_URL_WITH_WHITESPACE_PATTERN.test(value) && !URL_DATA_PATTERN.test(value) ?
        value.replace(QUOTES_PATTERN, '') :
        value;
    }
  }
};

var urlQuotes = plugin$3;

var startsAsUrl$1 = startsAsUrl_1;

var WHITESPACE_PATTERN$1 = /\\?\n|\\?\r\n/g;
var WHITESPACE_PREFIX_PATTERN = /(\()\s+/g;
var WHITESPACE_SUFFIX_PATTERN = /\s+(\))/g;

var plugin$2 = {
  level1: {
    value: function urlWhitespace(_name, value) {
      if (!startsAsUrl$1(value)) {
        return value;
      }

      return value
        .replace(WHITESPACE_PATTERN$1, '')
        .replace(WHITESPACE_PREFIX_PATTERN, '$1')
        .replace(WHITESPACE_SUFFIX_PATTERN, '$1');
    }
  }
};

var urlWhitespace = plugin$2;

var OptimizationLevel$7 = optimizationLevel.OptimizationLevel;

var Marker$9 = marker;

var CALC_DIVISION_WHITESPACE_PATTERN = /\) ?\/ ?/g;
var COMMA_AND_SPACE_PATTERN = /, /g;
var LINE_BREAK_PATTERN = /\r?\n/g;
var MULTI_WHITESPACE_PATTERN = /\s+/g;
var FUNCTION_CLOSING_BRACE_WHITESPACE_PATTERN = /\s+(;?\))/g;
var FUNCTION_OPENING_BRACE_WHITESPACE_PATTERN = /(\(;?)\s+/g;
var VARIABLE_NAME_PATTERN = /^--\S+$/;
var VARIABLE_VALUE_PATTERN = /^var\(\s*--\S+\s*\)$/;

var plugin$1 = {
  level1: {
    value: function whitespace(name, value, options) {
      if (!options.level[OptimizationLevel$7.One].removeWhitespace) {
        return value;
      }

      if (VARIABLE_NAME_PATTERN.test(name) && !VARIABLE_VALUE_PATTERN.test(value)) {
        return value;
      }

      if ((value.indexOf(' ') == -1 && value.indexOf('\n') == -1) || value.indexOf('expression') === 0) {
        return value;
      }

      if (value.indexOf(Marker$9.SINGLE_QUOTE) > -1 || value.indexOf(Marker$9.DOUBLE_QUOTE) > -1) {
        return value;
      }

      value = value.replace(LINE_BREAK_PATTERN, '');
      value = value.replace(MULTI_WHITESPACE_PATTERN, ' ');

      if (value.indexOf('calc') > -1) {
        value = value.replace(CALC_DIVISION_WHITESPACE_PATTERN, ')/ ');
      }

      return value
        .replace(FUNCTION_OPENING_BRACE_WHITESPACE_PATTERN, '$1')
        .replace(FUNCTION_CLOSING_BRACE_WHITESPACE_PATTERN, '$1')
        .replace(COMMA_AND_SPACE_PATTERN, ',');
    }
  }
};

var whitespace = plugin$1;

var split$2 = split_1;

var ANY_FUNCTION_PATTERN = /^(\-(?:moz|ms|o|webkit)\-[a-z\-]+|[a-z\-]+)\((.+)\)$/;
var SKIP_FUNCTION_PATTERN = /^(?:\-moz\-calc|\-webkit\-calc|calc|rgb|hsl|rgba|hsla|min|max|clamp|expression)\(/;
var TOKEN_SEPARATOR_PATTERN = /([\s,\/])/;

function removeRecursively(value, options) {
  var functionTokens;
  var tokens;

  if (SKIP_FUNCTION_PATTERN.test(value)) {
    return value;
  }

  functionTokens = ANY_FUNCTION_PATTERN.exec(value);

  if (!functionTokens) {
    return removeZeros(value, options);
  }

  tokens = split$2(functionTokens[2], TOKEN_SEPARATOR_PATTERN)
    .map(function (token) { return removeRecursively(token, options); });

  return functionTokens[1] + '(' + tokens.join('') + ')';
}

function removeZeros(value, options) {
  return value
    .replace(options.unitsRegexp, '$1' + '0' + '$2')
    .replace(options.unitsRegexp, '$1' + '0' + '$2');
}

var plugin = {
  level1: {
    value: function zero(name, value, options) {
      if (!options.compatibility.properties.zeroUnits) {
        return value;
      }

      if (value.indexOf('%') > 0 && (name == 'height' || name == 'max-height' || name == 'width' || name == 'max-width')) {
        return value;
      }

      return removeRecursively(value, options);
    }
  }
};

var zero = plugin;

var valueOptimizers$1 = {
  color: color.level1.value,
  degrees: degrees.level1.value,
  fraction: fraction.level1.value,
  precision: precision.level1.value,
  textQuotes: textQuotes.level1.value,
  time: time.level1.value,
  unit: unit.level1.value,
  urlPrefix: urlPrefix.level1.value,
  urlQuotes: urlQuotes.level1.value,
  urlWhiteSpace: urlWhitespace.level1.value,
  whiteSpace: whitespace.level1.value,
  zero: zero.level1.value
};

// Contains the interpretation of CSS properties, as used by the property optimizer

var breakUp = breakUp$1;
var canOverride = canOverride$1;
var restore = restore$1;

var propertyOptimizers = propertyOptimizers$1;
var valueOptimizers = valueOptimizers$1;

var override$3 = override_1;

// Properties to process
// Extend this object in order to add support for more properties in the optimizer.
//
// Each key in this object represents a CSS property and should be an object.
// Such an object contains properties that describe how the represented CSS property should be handled.
// Possible options:
//
// * components: array (Only specify for shorthand properties.)
//   Contains the names of the granular properties this shorthand compacts.
//
// * canOverride: function
//   Returns whether two tokens of this property can be merged with each other.
//   This property has no meaning for shorthands.
//
// * defaultValue: string
//   Specifies the default value of the property according to the CSS standard.
//   For shorthand, this is used when every component is set to its default value, therefore it should be the shortest possible default value of all the components.
//
// * shortestValue: string
//   Specifies the shortest possible value the property can possibly have.
//   (Falls back to defaultValue if unspecified.)
//
// * breakUp: function (Only specify for shorthand properties.)
//   Breaks the shorthand up to its components.
//
// * restore: function (Only specify for shorthand properties.)
//   Puts the shorthand together from its components.
//
var configuration$8 = {
  'animation': {
    canOverride: canOverride.generic.components([
      canOverride.generic.time,
      canOverride.generic.timingFunction,
      canOverride.generic.time,
      canOverride.property.animationIterationCount,
      canOverride.property.animationDirection,
      canOverride.property.animationFillMode,
      canOverride.property.animationPlayState,
      canOverride.property.animationName
    ]),
    components: [
      'animation-duration',
      'animation-timing-function',
      'animation-delay',
      'animation-iteration-count',
      'animation-direction',
      'animation-fill-mode',
      'animation-play-state',
      'animation-name'
    ],
    breakUp: breakUp.multiplex(breakUp.animation),
    defaultValue: 'none',
    restore: restore.multiplex(restore.withoutDefaults),
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.textQuotes,
      valueOptimizers.time,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-delay': {
    canOverride: canOverride.generic.time,
    componentOf: [
      'animation'
    ],
    defaultValue: '0s',
    intoMultiplexMode: 'real',
    valueOptimizers: [
      valueOptimizers.time,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-direction': {
    canOverride: canOverride.property.animationDirection,
    componentOf: [
      'animation'
    ],
    defaultValue: 'normal',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-duration': {
    canOverride: canOverride.generic.time,
    componentOf: [
      'animation'
    ],
    defaultValue: '0s',
    intoMultiplexMode: 'real',
    keepUnlessDefault: 'animation-delay',
    valueOptimizers: [
      valueOptimizers.time,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-fill-mode': {
    canOverride: canOverride.property.animationFillMode,
    componentOf: [
      'animation'
    ],
    defaultValue: 'none',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-iteration-count': {
    canOverride: canOverride.property.animationIterationCount,
    componentOf: [
      'animation'
    ],
    defaultValue: '1',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-name': {
    canOverride: canOverride.property.animationName,
    componentOf: [
      'animation'
    ],
    defaultValue: 'none',
    intoMultiplexMode: 'real',
    valueOptimizers: [
      valueOptimizers.textQuotes
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-play-state': {
    canOverride: canOverride.property.animationPlayState,
    componentOf: [
      'animation'
    ],
    defaultValue: 'running',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'animation-timing-function': {
    canOverride: canOverride.generic.timingFunction,
    componentOf: [
      'animation'
    ],
    defaultValue: 'ease',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-o-',
      '-webkit-'
    ]
  },
  'background': {
    canOverride: canOverride.generic.components([
      canOverride.generic.image,
      canOverride.property.backgroundPosition,
      canOverride.property.backgroundSize,
      canOverride.property.backgroundRepeat,
      canOverride.property.backgroundAttachment,
      canOverride.property.backgroundOrigin,
      canOverride.property.backgroundClip,
      canOverride.generic.color
    ]),
    components: [
      'background-image',
      'background-position',
      'background-size',
      'background-repeat',
      'background-attachment',
      'background-origin',
      'background-clip',
      'background-color'
    ],
    breakUp: breakUp.multiplex(breakUp.background),
    defaultValue: '0 0',
    propertyOptimizer: propertyOptimizers.background,
    restore: restore.multiplex(restore.background),
    shortestValue: '0',
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.urlWhiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.zero,
      valueOptimizers.color,
      valueOptimizers.urlPrefix,
      valueOptimizers.urlQuotes
    ]
  },
  'background-attachment': {
    canOverride: canOverride.property.backgroundAttachment,
    componentOf: [
      'background'
    ],
    defaultValue: 'scroll',
    intoMultiplexMode: 'real'
  },
  'background-clip': {
    canOverride: canOverride.property.backgroundClip,
    componentOf: [
      'background'
    ],
    defaultValue: 'border-box',
    intoMultiplexMode: 'real',
    shortestValue: 'border-box'
  },
  'background-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'background'
    ],
    defaultValue: 'transparent',
    intoMultiplexMode: 'real', // otherwise real color will turn into default since color appears in last multiplex only
    multiplexLastOnly: true,
    nonMergeableValue: 'none',
    shortestValue: 'red',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'background-image': {
    canOverride: canOverride.generic.image,
    componentOf: [
      'background'
    ],
    defaultValue: 'none',
    intoMultiplexMode: 'default',
    valueOptimizers: [
      valueOptimizers.urlWhiteSpace,
      valueOptimizers.urlPrefix,
      valueOptimizers.urlQuotes,
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero,
      valueOptimizers.color
    ]
  },
  'background-origin': {
    canOverride: canOverride.property.backgroundOrigin,
    componentOf: [
      'background'
    ],
    defaultValue: 'padding-box',
    intoMultiplexMode: 'real',
    shortestValue: 'border-box'
  },
  'background-position': {
    canOverride: canOverride.property.backgroundPosition,
    componentOf: [
      'background'
    ],
    defaultValue: ['0', '0'],
    doubleValues: true,
    intoMultiplexMode: 'real',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'background-repeat': {
    canOverride: canOverride.property.backgroundRepeat,
    componentOf: [
      'background'
    ],
    defaultValue: ['repeat'],
    doubleValues: true,
    intoMultiplexMode: 'real'
  },
  'background-size': {
    canOverride: canOverride.property.backgroundSize,
    componentOf: [
      'background'
    ],
    defaultValue: ['auto'],
    doubleValues: true,
    intoMultiplexMode: 'real',
    shortestValue: '0 0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'bottom': {
    canOverride: canOverride.property.bottom,
    defaultValue: 'auto',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'border': {
    breakUp: breakUp.border,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.property.borderStyle,
      canOverride.generic.color
    ]),
    components: [
      'border-width',
      'border-style',
      'border-color'
    ],
    defaultValue: 'none',
    overridesShorthands: [
      'border-bottom',
      'border-left',
      'border-right',
      'border-top'
    ],
    restore: restore.withoutDefaults,
    shorthand: true,
    shorthandComponents: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.zero,
      valueOptimizers.color
    ]
  },
  'border-bottom': {
    breakUp: breakUp.border,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.property.borderStyle,
      canOverride.generic.color
    ]),
    components: [
      'border-bottom-width',
      'border-bottom-style',
      'border-bottom-color'
    ],
    defaultValue: 'none',
    restore: restore.withoutDefaults,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.zero,
      valueOptimizers.color
    ]
  },
  'border-bottom-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'border-bottom',
      'border-color'
    ],
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-bottom-left-radius': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-radius'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.borderRadius,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-'
    ]
  },
  'border-bottom-right-radius': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-radius'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.borderRadius,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-'
    ]
  },
  'border-bottom-style': {
    canOverride: canOverride.property.borderStyle,
    componentOf: [
      'border-bottom',
      'border-style'
    ],
    defaultValue: 'none'
  },
  'border-bottom-width': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-bottom',
      'border-width'
    ],
    defaultValue: 'medium',
    oppositeTo: 'border-top-width',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'border-collapse': {
    canOverride: canOverride.property.borderCollapse,
    defaultValue: 'separate'
  },
  'border-color': {
    breakUp: breakUp.fourValues,
    canOverride: canOverride.generic.components([
      canOverride.generic.color,
      canOverride.generic.color,
      canOverride.generic.color,
      canOverride.generic.color
    ]),
    componentOf: [
      'border'
    ],
    components: [
      'border-top-color',
      'border-right-color',
      'border-bottom-color',
      'border-left-color'
    ],
    defaultValue: 'none',
    restore: restore.fourValues,
    shortestValue: 'red',
    shorthand: true,
    singleTypeComponents: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-left': {
    breakUp: breakUp.border,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.property.borderStyle,
      canOverride.generic.color
    ]),
    components: [
      'border-left-width',
      'border-left-style',
      'border-left-color'
    ],
    defaultValue: 'none',
    restore: restore.withoutDefaults,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.zero,
      valueOptimizers.color
    ]
  },
  'border-left-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'border-color',
      'border-left'
    ],
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-left-style': {
    canOverride: canOverride.property.borderStyle,
    componentOf: [
      'border-left',
      'border-style'
    ],
    defaultValue: 'none'
  },
  'border-left-width': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-left',
      'border-width'
    ],
    defaultValue: 'medium',
    oppositeTo: 'border-right-width',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'border-radius': {
    breakUp: breakUp.borderRadius,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit
    ]),
    components: [
      'border-top-left-radius',
      'border-top-right-radius',
      'border-bottom-right-radius',
      'border-bottom-left-radius'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.borderRadius,
    restore: restore.borderRadius,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-'
    ]
  },
  'border-right': {
    breakUp: breakUp.border,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.property.borderStyle,
      canOverride.generic.color
    ]),
    components: [
      'border-right-width',
      'border-right-style',
      'border-right-color'
    ],
    defaultValue: 'none',
    restore: restore.withoutDefaults,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-right-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'border-color',
      'border-right'
    ],
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-right-style': {
    canOverride: canOverride.property.borderStyle,
    componentOf: [
      'border-right',
      'border-style'
    ],
    defaultValue: 'none'
  },
  'border-right-width': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-right',
      'border-width'
    ],
    defaultValue: 'medium',
    oppositeTo: 'border-left-width',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'border-style': {
    breakUp: breakUp.fourValues,
    canOverride: canOverride.generic.components([
      canOverride.property.borderStyle,
      canOverride.property.borderStyle,
      canOverride.property.borderStyle,
      canOverride.property.borderStyle
    ]),
    componentOf: [
      'border'
    ],
    components: [
      'border-top-style',
      'border-right-style',
      'border-bottom-style',
      'border-left-style'
    ],
    defaultValue: 'none',
    restore: restore.fourValues,
    shorthand: true,
    singleTypeComponents: true
  },
  'border-top': {
    breakUp: breakUp.border,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.property.borderStyle,
      canOverride.generic.color
    ]),
    components: [
      'border-top-width',
      'border-top-style',
      'border-top-color'
    ],
    defaultValue: 'none',
    restore: restore.withoutDefaults,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.zero,
      valueOptimizers.color,
      valueOptimizers.unit
    ]
  },
  'border-top-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'border-color',
      'border-top'
    ],
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'border-top-left-radius': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-radius'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.borderRadius,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-'
    ]
  },
  'border-top-right-radius': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-radius'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.borderRadius,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-o-'
    ]
  },
  'border-top-style': {
    canOverride: canOverride.property.borderStyle,
    componentOf: [
      'border-style',
      'border-top'
    ],
    defaultValue: 'none'
  },
  'border-top-width': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'border-top',
      'border-width'
    ],
    defaultValue: 'medium',
    oppositeTo: 'border-bottom-width',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'border-width': {
    breakUp: breakUp.fourValues,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit
    ]),
    componentOf: [
      'border'
    ],
    components: [
      'border-top-width',
      'border-right-width',
      'border-bottom-width',
      'border-left-width'
    ],
    defaultValue: 'medium',
    restore: restore.fourValues,
    shortestValue: '0',
    shorthand: true,
    singleTypeComponents: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'box-shadow': {
    propertyOptimizer: propertyOptimizers.boxShadow,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero,
      valueOptimizers.color
    ],
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'clear': {
    canOverride: canOverride.property.clear,
    defaultValue: 'none'
  },
  'clip': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'color': {
    canOverride: canOverride.generic.color,
    defaultValue: 'transparent',
    shortestValue: 'red',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'column-gap': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'cursor': {
    canOverride: canOverride.property.cursor,
    defaultValue: 'auto'
  },
  'display': {
    canOverride: canOverride.property.display,
  },
  'filter': {
    propertyOptimizer: propertyOptimizers.filter,
    valueOptimizers: [
      valueOptimizers.fraction
    ]
  },
  'float': {
    canOverride: canOverride.property.float,
    defaultValue: 'none'
  },
  'font': {
    breakUp: breakUp.font,
    canOverride: canOverride.generic.components([
      canOverride.property.fontStyle,
      canOverride.property.fontVariant,
      canOverride.property.fontWeight,
      canOverride.property.fontStretch,
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.property.fontFamily
    ]),
    components: [
      'font-style',
      'font-variant',
      'font-weight',
      'font-stretch',
      'font-size',
      'line-height',
      'font-family'
    ],
    restore: restore.font,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.textQuotes
    ]
  },
  'font-family': {
    canOverride: canOverride.property.fontFamily,
    defaultValue: 'user|agent|specific',
    valueOptimizers: [
      valueOptimizers.textQuotes
    ]
  },
  'font-size': {
    canOverride: canOverride.generic.unit,
    defaultValue: 'medium',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.fraction
    ]
  },
  'font-stretch': {
    canOverride: canOverride.property.fontStretch,
    defaultValue: 'normal'
  },
  'font-style': {
    canOverride: canOverride.property.fontStyle,
    defaultValue: 'normal'
  },
  'font-variant': {
    canOverride: canOverride.property.fontVariant,
    defaultValue: 'normal'
  },
  'font-weight': {
    canOverride: canOverride.property.fontWeight,
    defaultValue: 'normal',
    propertyOptimizer: propertyOptimizers.fontWeight,
    shortestValue: '400'
  },
  'gap': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'height': {
    canOverride: canOverride.generic.unit,
    defaultValue: 'auto',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'left': {
    canOverride: canOverride.property.left,
    defaultValue: 'auto',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'letter-spacing': {
    valueOptimizers: [
      valueOptimizers.fraction,
      valueOptimizers.zero
    ]
  },
  'line-height': {
    canOverride: canOverride.generic.unitOrNumber,
    defaultValue: 'normal',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.fraction,
      valueOptimizers.zero
    ]
  },
  'list-style': {
    canOverride: canOverride.generic.components([
      canOverride.property.listStyleType,
      canOverride.property.listStylePosition,
      canOverride.property.listStyleImage
    ]),
    components: [
      'list-style-type',
      'list-style-position',
      'list-style-image'
    ],
    breakUp: breakUp.listStyle,
    restore: restore.withoutDefaults,
    defaultValue: 'outside', // can't use 'disc' because that'd override default 'decimal' for <ol>
    shortestValue: 'none',
    shorthand: true
  },
  'list-style-image' : {
    canOverride: canOverride.generic.image,
    componentOf: [
      'list-style'
    ],
    defaultValue: 'none'
  },
  'list-style-position' : {
    canOverride: canOverride.property.listStylePosition,
    componentOf: [
      'list-style'
    ],
    defaultValue: 'outside',
    shortestValue: 'inside'
  },
  'list-style-type' : {
    canOverride: canOverride.property.listStyleType,
    componentOf: [
      'list-style'
    ],
    // NOTE: we can't tell the real default value here, it's 'disc' for <ul> and 'decimal' for <ol>
    // this is a hack, but it doesn't matter because this value will be either overridden or
    // it will disappear at the final step anyway
    defaultValue: 'decimal|disc',
    shortestValue: 'none'
  },
  'margin': {
    breakUp: breakUp.fourValues,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit
    ]),
    components: [
      'margin-top',
      'margin-right',
      'margin-bottom',
      'margin-left'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.margin,
    restore: restore.fourValues,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-bottom': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'margin'
    ],
    defaultValue: '0',
    oppositeTo: 'margin-top',
    propertyOptimizer: propertyOptimizers.margin,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-inline-end': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-inline-start': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-left': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'margin'
    ],
    defaultValue: '0',
    oppositeTo: 'margin-right',
    propertyOptimizer: propertyOptimizers.margin,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-right': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'margin'
    ],
    defaultValue: '0',
    oppositeTo: 'margin-left',
    propertyOptimizer: propertyOptimizers.margin,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'margin-top': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'margin'
    ],
    defaultValue: '0',
    oppositeTo: 'margin-bottom',
    propertyOptimizer: propertyOptimizers.margin,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'max-height': {
    canOverride: canOverride.generic.unit,
    defaultValue: 'none',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'max-width': {
    canOverride: canOverride.generic.unit,
    defaultValue: 'none',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'min-height': {
    canOverride: canOverride.generic.unit,
    defaultValue: '0',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'min-width': {
    canOverride: canOverride.generic.unit,
    defaultValue: '0',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'opacity': {
    valueOptimizers: [
      valueOptimizers.fraction,
      valueOptimizers.precision
    ]
  },
  'outline': {
    canOverride: canOverride.generic.components([
      canOverride.generic.color,
      canOverride.property.outlineStyle,
      canOverride.generic.unit
    ]),
    components: [
      'outline-color',
      'outline-style',
      'outline-width'
    ],
    breakUp: breakUp.outline,
    restore: restore.withoutDefaults,
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.outline,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'outline-color': {
    canOverride: canOverride.generic.color,
    componentOf: [
      'outline'
    ],
    defaultValue: 'invert',
    shortestValue: 'red',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.color
    ]
  },
  'outline-style': {
    canOverride: canOverride.property.outlineStyle,
    componentOf: [
      'outline'
    ],
    defaultValue: 'none'
  },
  'outline-width': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'outline'
    ],
    defaultValue: 'medium',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'overflow': {
    canOverride: canOverride.property.overflow,
    defaultValue: 'visible'
  },
  'overflow-x': {
    canOverride: canOverride.property.overflow,
    defaultValue: 'visible'
  },
  'overflow-y': {
    canOverride: canOverride.property.overflow,
    defaultValue: 'visible'
  },
  'padding': {
    breakUp: breakUp.fourValues,
    canOverride: canOverride.generic.components([
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit,
      canOverride.generic.unit
    ]),
    components: [
      'padding-top',
      'padding-right',
      'padding-bottom',
      'padding-left'
    ],
    defaultValue: '0',
    propertyOptimizer: propertyOptimizers.padding,
    restore: restore.fourValues,
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'padding-bottom': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'padding'
    ],
    defaultValue: '0',
    oppositeTo: 'padding-top',
    propertyOptimizer: propertyOptimizers.padding,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'padding-left': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'padding'
    ],
    defaultValue: '0',
    oppositeTo: 'padding-right',
    propertyOptimizer: propertyOptimizers.padding,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'padding-right': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'padding'
    ],
    defaultValue: '0',
    oppositeTo: 'padding-left',
    propertyOptimizer: propertyOptimizers.padding,
        valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'padding-top': {
    canOverride: canOverride.generic.unit,
    componentOf: [
      'padding'
    ],
    defaultValue: '0',
    oppositeTo: 'padding-bottom',
    propertyOptimizer: propertyOptimizers.padding,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'position': {
    canOverride: canOverride.property.position,
    defaultValue: 'static'
  },
  'right': {
    canOverride: canOverride.property.right,
    defaultValue: 'auto',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'row-gap': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'src': {
    valueOptimizers: [
      valueOptimizers.urlWhiteSpace,
      valueOptimizers.urlPrefix,
      valueOptimizers.urlQuotes
    ]
  },
  'stroke-width': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'text-align': {
    canOverride: canOverride.property.textAlign,
    // NOTE: we can't tell the real default value here, as it depends on default text direction
    // this is a hack, but it doesn't matter because this value will be either overridden or
    // it will disappear anyway
    defaultValue: 'left|right'
  },
  'text-decoration': {
    canOverride: canOverride.property.textDecoration,
    defaultValue: 'none'
  },
  'text-indent': {
    canOverride: canOverride.property.textOverflow,
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.fraction,
      valueOptimizers.zero
    ]
  },
  'text-overflow': {
    canOverride: canOverride.property.textOverflow,
    defaultValue: 'none'
  },
  'text-shadow': {
    canOverride: canOverride.property.textShadow,
    defaultValue: 'none',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.zero,
      valueOptimizers.color
    ]
  },
  'top': {
    canOverride: canOverride.property.top,
    defaultValue: 'auto',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'transform': {
    canOverride: canOverride.property.transform,
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.degrees,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ],
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'transition': {
    breakUp: breakUp.multiplex(breakUp.transition),
    canOverride: canOverride.generic.components([
      canOverride.property.transitionProperty,
      canOverride.generic.time,
      canOverride.generic.timingFunction,
      canOverride.generic.time
    ]),
    components: [
      'transition-property',
      'transition-duration',
      'transition-timing-function',
      'transition-delay'
    ],
    defaultValue: 'none',
    restore: restore.multiplex(restore.withoutDefaults),
    shorthand: true,
    valueOptimizers: [
      valueOptimizers.time,
      valueOptimizers.fraction
    ],
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'transition-delay': {
    canOverride: canOverride.generic.time,
    componentOf: [
      'transition'
    ],
    defaultValue: '0s',
    intoMultiplexMode: 'real',
    valueOptimizers: [
      valueOptimizers.time
    ],
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'transition-duration': {
    canOverride: canOverride.generic.time,
    componentOf: [
      'transition'
    ],
    defaultValue: '0s',
    intoMultiplexMode: 'real',
    keepUnlessDefault: 'transition-delay',
    valueOptimizers: [
      valueOptimizers.time,
      valueOptimizers.fraction
    ],
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'transition-property': {
    canOverride: canOverride.generic.propertyName,
    componentOf: [
      'transition'
    ],
    defaultValue: 'all',
    intoMultiplexMode: 'placeholder',
    placeholderValue: '_', // it's a short value that won't match any property and still be a valid `transition-property`
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'transition-timing-function': {
    canOverride: canOverride.generic.timingFunction,
    componentOf: [
      'transition'
    ],
    defaultValue: 'ease',
    intoMultiplexMode: 'real',
    vendorPrefixes: [
      '-moz-',
      '-ms-',
      '-o-',
      '-webkit-'
    ]
  },
  'vertical-align': {
    canOverride: canOverride.property.verticalAlign,
    defaultValue: 'baseline',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'visibility': {
    canOverride: canOverride.property.visibility,
    defaultValue: 'visible'
  },
  '-webkit-tap-highlight-color': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.color
    ]
  },
  '-webkit-margin-end': {
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'white-space': {
    canOverride: canOverride.property.whiteSpace,
    defaultValue: 'normal'
  },
  'width': {
    canOverride: canOverride.generic.unit,
    defaultValue: 'auto',
    shortestValue: '0',
    valueOptimizers: [
      valueOptimizers.whiteSpace,
      valueOptimizers.fraction,
      valueOptimizers.precision,
      valueOptimizers.unit,
      valueOptimizers.zero
    ]
  },
  'z-index': {
    canOverride: canOverride.property.zIndex,
    defaultValue: 'auto'
  }
};

// generate vendor-prefixed configuration
var vendorPrefixedConfiguration = {};

function cloneDescriptor(propertyName, prefix) {
  var clonedDescriptor = override$3(configuration$8[propertyName], {});

  if ('componentOf' in clonedDescriptor) {
    clonedDescriptor.componentOf = clonedDescriptor.componentOf.map(function (shorthandName) {
      return prefix + shorthandName;
    });
  }

  if ('components' in clonedDescriptor) {
    clonedDescriptor.components = clonedDescriptor.components.map(function (longhandName) {
      return prefix + longhandName;
    });
  }

  if ('keepUnlessDefault' in clonedDescriptor) {
    clonedDescriptor.keepUnlessDefault = prefix + clonedDescriptor.keepUnlessDefault;
  }

  return clonedDescriptor;
}

var vendorPrefixedConfiguration = {};

for (var propertyName in configuration$8) {
  var descriptor = configuration$8[propertyName];

  if (!('vendorPrefixes' in descriptor)) {
    continue;
  }

  for (var i = 0; i < descriptor.vendorPrefixes.length; i++) {
    var prefix = descriptor.vendorPrefixes[i];
    var clonedDescriptor = cloneDescriptor(propertyName, prefix);
    delete clonedDescriptor.vendorPrefixes;

    vendorPrefixedConfiguration[prefix + propertyName] = clonedDescriptor;
  }

  delete descriptor.vendorPrefixes;
}

var configuration_1 = override$3(configuration$8, vendorPrefixedConfiguration);

var emptyCharacter = '';

var Breaks = format$3.Breaks;
var Spaces = format$3.Spaces;

var Marker$8 = marker;
var Token$j = token;

function supportsAfterClosingBrace(token) {
  return token[1][1] == 'background' || token[1][1] == 'transform' || token[1][1] == 'src';
}

function afterClosingBrace(token, valueIndex) {
  return token[valueIndex][1][token[valueIndex][1].length - 1] == Marker$8.CLOSE_ROUND_BRACKET;
}

function afterComma(token, valueIndex) {
  return token[valueIndex][1] == Marker$8.COMMA;
}

function afterSlash(token, valueIndex) {
  return token[valueIndex][1] == Marker$8.FORWARD_SLASH;
}

function beforeComma(token, valueIndex) {
  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker$8.COMMA;
}

function beforeSlash(token, valueIndex) {
  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker$8.FORWARD_SLASH;
}

function inFilter(token) {
  return token[1][1] == 'filter' || token[1][1] == '-ms-filter';
}

function disallowsSpace(context, token, valueIndex) {
  return !context.spaceAfterClosingBrace && supportsAfterClosingBrace(token) && afterClosingBrace(token, valueIndex) ||
    beforeSlash(token, valueIndex) ||
    afterSlash(token, valueIndex) ||
    beforeComma(token, valueIndex) ||
    afterComma(token, valueIndex);
}

function rules$1(context, tokens) {
  var store = context.store;

  for (var i = 0, l = tokens.length; i < l; i++) {
    store(context, tokens[i]);

    if (i < l - 1) {
      store(context, comma$1(context));
    }
  }
}

function body$1(context, tokens) {
  var lastPropertyAt = lastPropertyIndex(tokens);

  for (var i = 0, l = tokens.length; i < l; i++) {
    property$1(context, tokens, i, lastPropertyAt);
  }
}

function lastPropertyIndex(tokens) {
  var index = tokens.length - 1;

  for (; index >= 0; index--) {
    if (tokens[index][0] != Token$j.COMMENT) {
      break;
    }
  }

  return index;
}

function property$1(context, tokens, position, lastPropertyAt) {
  var store = context.store;
  var token = tokens[position];

  var propertyValue = token[2];
  var isPropertyBlock = propertyValue && propertyValue[0] === Token$j.PROPERTY_BLOCK;

  var needsSemicolon;
  if ( context.format ) {
    if ( context.format.semicolonAfterLastProperty || isPropertyBlock ) {
      needsSemicolon = true;
    } else if ( position < lastPropertyAt ) {
      needsSemicolon = true;
    } else {
      needsSemicolon = false;
    }
  } else {
    needsSemicolon = position < lastPropertyAt || isPropertyBlock;
  }

  var isLast = position === lastPropertyAt;

  switch (token[0]) {
    case Token$j.AT_RULE:
      store(context, token);
      store(context, semicolon$1(context, Breaks.AfterProperty, false));
      break;
    case Token$j.AT_RULE_BLOCK:
      rules$1(context, token[1]);
      store(context, openBrace(context, Breaks.AfterRuleBegins, true));
      body$1(context, token[2]);
      store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
      break;
    case Token$j.COMMENT:
      store(context, token);
      store(context, breakFor(context, Breaks.AfterComment) + context.indentWith);
      break;
    case Token$j.PROPERTY:
      store(context, token[1]);
      store(context, colon(context));
      if (propertyValue) {
        value$1(context, token);
      }
      store(context, needsSemicolon ? semicolon$1(context, Breaks.AfterProperty, isLast) : emptyCharacter);
      break;
    case Token$j.RAW:
      store(context, token);
  }
}

function value$1(context, token) {
  var store = context.store;
  var j, m;

  if (token[2][0] == Token$j.PROPERTY_BLOCK) {
    store(context, openBrace(context, Breaks.AfterBlockBegins, false));
    body$1(context, token[2][1]);
    store(context, closeBrace(context, Breaks.AfterBlockEnds, false, true));
  } else {
    for (j = 2, m = token.length; j < m; j++) {
      store(context, token[j]);

      if (j < m - 1 && (inFilter(token) || !disallowsSpace(context, token, j))) {
        store(context, Marker$8.SPACE);
      }
    }
  }
}

function breakFor(context, where) {
  return context.format ? context.format.breaks[where] : emptyCharacter;
}

function allowsSpace(context, where) {
  return context.format && context.format.spaces[where];
}

function openBrace(context, where, needsPrefixSpace) {
  if (context.format) {
    context.indentBy += context.format.indentBy;
    context.indentWith = context.format.indentWith.repeat(context.indentBy);
    return (needsPrefixSpace && allowsSpace(context, Spaces.BeforeBlockBegins) ? Marker$8.SPACE : emptyCharacter) +
      Marker$8.OPEN_CURLY_BRACKET +
      breakFor(context, where) +
      context.indentWith;
  } else {
    return Marker$8.OPEN_CURLY_BRACKET;
  }
}

function closeBrace(context, where, beforeBlockEnd, isLast) {
  if (context.format) {
    context.indentBy -= context.format.indentBy;
    context.indentWith = context.format.indentWith.repeat(context.indentBy);
    return (beforeBlockEnd ? breakFor(context, Breaks.BeforeBlockEnds) : breakFor(context, Breaks.AfterProperty)) +
      context.indentWith +
      Marker$8.CLOSE_CURLY_BRACKET +
      (isLast ? emptyCharacter : breakFor(context, where) + context.indentWith);
  } else {
    return Marker$8.CLOSE_CURLY_BRACKET;
  }
}

function colon(context) {
  return context.format ?
    Marker$8.COLON + (allowsSpace(context, Spaces.BeforeValue) ? Marker$8.SPACE : emptyCharacter) :
    Marker$8.COLON;
}

function semicolon$1(context, where, isLast) {
  return context.format ?
    Marker$8.SEMICOLON + (isLast ? emptyCharacter : (breakFor(context, where) + context.indentWith)) :
    Marker$8.SEMICOLON;
}

function comma$1(context) {
  return context.format ?
    Marker$8.COMMA + breakFor(context, Breaks.BetweenSelectors) + context.indentWith :
    Marker$8.COMMA;
}

function all$4(context, tokens) {
  var store = context.store;
  var token;
  var isLast;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];
    isLast = i == l - 1;

    switch (token[0]) {
      case Token$j.AT_RULE:
        store(context, token);
        store(context, semicolon$1(context, Breaks.AfterAtRule, isLast));
        break;
      case Token$j.AT_RULE_BLOCK:
        rules$1(context, token[1]);
        store(context, openBrace(context, Breaks.AfterRuleBegins, true));
        body$1(context, token[2]);
        store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
        break;
      case Token$j.NESTED_BLOCK:
        rules$1(context, token[1]);
        store(context, openBrace(context, Breaks.AfterBlockBegins, true));
        all$4(context, token[2]);
        store(context, closeBrace(context, Breaks.AfterBlockEnds, true, isLast));
        break;
      case Token$j.COMMENT:
        store(context, token);
        store(context, breakFor(context, Breaks.AfterComment) + context.indentWith);
        break;
      case Token$j.RAW:
        store(context, token);
        break;
      case Token$j.RULE:
        rules$1(context, token[1]);
        store(context, openBrace(context, Breaks.AfterRuleBegins, true));
        body$1(context, token[2]);
        store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
        break;
    }
  }
}

var helpers$1 = {
  all: all$4,
  body: body$1,
  property: property$1,
  rules: rules$1,
  value: value$1
};

var helpers = helpers$1;

function store$2(serializeContext, token) {
  serializeContext.output.push(typeof token == 'string' ? token : token[1]);
}

function context() {
  var newContext = {
    output: [],
    store: store$2
  };

  return newContext;
}

function all$3(tokens) {
  var oneTimeContext = context();
  helpers.all(oneTimeContext, tokens);
  return oneTimeContext.output.join('');
}

function body(tokens) {
  var oneTimeContext = context();
  helpers.body(oneTimeContext, tokens);
  return oneTimeContext.output.join('');
}

function property(tokens, position) {
  var oneTimeContext = context();
  helpers.property(oneTimeContext, tokens, position, true);
  return oneTimeContext.output.join('');
}

function rules(tokens) {
  var oneTimeContext = context();
  helpers.rules(oneTimeContext, tokens);
  return oneTimeContext.output.join('');
}

function value(tokens) {
  var oneTimeContext = context();
  helpers.value(oneTimeContext, tokens);
  return oneTimeContext.output.join('');
}

var oneTime = {
  all: all$3,
  body: body,
  property: property,
  rules: rules,
  value: value
};

var sortSelectors$2 = sortSelectors_1;
var tidyRules$2 = tidyRules_1;
var tidyBlock = tidyBlock_1;
var tidyAtRule = tidyAtRule_1;

var Hack = hack;
var removeUnused$1 = removeUnused_1;
var restoreFromOptimizing$4 = restoreFromOptimizing_1;
var wrapForOptimizing$2 = wrapForOptimizing$3.all;

var configuration$7 = configuration_1;
var optimizers = valueOptimizers$1;

var OptimizationLevel$6 = optimizationLevel.OptimizationLevel;

var Token$i = token;
var Marker$7 = marker;

var formatPosition$1 = formatPosition_1;

var serializeRules$9 = oneTime.rules;

var CHARSET_TOKEN = '@charset';
var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');

var DEFAULT_ROUNDING_PRECISION = roundingPrecision.DEFAULT;

var PROPERTY_NAME_PATTERN = /^(?:\-chrome\-|\-[\w\-]+\w|\w[\w\-]+\w|\w{1,}|\-\-\S+)$/;
var IMPORT_PREFIX_PATTERN$2 = /^@import/i;
var URL_PREFIX_PATTERN$2 = /^url\(/i;

function startsAsUrl(value) {
  return URL_PREFIX_PATTERN$2.test(value);
}

function isImport$3(token) {
  return IMPORT_PREFIX_PATTERN$2.test(token[1]);
}

function isLegacyFilter(property) {
  var value;

  if (property.name == 'filter' || property.name == '-ms-filter') {
    value = property.value[0][1];

    return value.indexOf('progid') > -1 ||
      value.indexOf('alpha') === 0 ||
      value.indexOf('chroma') === 0;
  } else {
    return false;
  }
}

function noop$1() {}

function optimizeBody(rule, properties, context) {
  var options = context.options;
  var valueOptimizers;
  var property, name, type, value;
  var propertyToken;
  var propertyOptimizer;
  var serializedRule = serializeRules$9(rule);
  var _properties = wrapForOptimizing$2(properties);
  var pluginValueOptimizers = context.options.plugins.level1Value;
  var pluginPropertyOptimizers = context.options.plugins.level1Property;
  var i, l;

  for (i = 0, l = _properties.length; i < l; i++) {
    var j, k, m, n;

    property = _properties[i];
    name = property.name;
    propertyOptimizer = configuration$7[name] && configuration$7[name].propertyOptimizer || noop$1;
    valueOptimizers = configuration$7[name] && configuration$7[name].valueOptimizers || [optimizers.whiteSpace];

    if (!PROPERTY_NAME_PATTERN.test(name)) {
      propertyToken = property.all[property.position];
      context.warnings.push('Invalid property name \'' + name + '\' at ' + formatPosition$1(propertyToken[1][2][0]) + '. Ignoring.');
      property.unused = true;
      continue;
    }

    if (property.value.length === 0) {
      propertyToken = property.all[property.position];
      context.warnings.push('Empty property \'' + name + '\' at ' + formatPosition$1(propertyToken[1][2][0]) + '. Ignoring.');
      property.unused = true;
      continue;
    }

    if (property.hack && (
        (property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE) && !options.compatibility.properties.iePrefixHack ||
        property.hack[0] == Hack.BACKSLASH && !options.compatibility.properties.ieSuffixHack ||
        property.hack[0] == Hack.BANG && !options.compatibility.properties.ieBangHack)) {
      property.unused = true;
      continue;
    }

    if (!options.compatibility.properties.ieFilters && isLegacyFilter(property)) {
      property.unused = true;
      continue;
    }

    if (property.block) {
      optimizeBody(rule, property.value[0][1], context);
      continue;
    }

    for (j = 0, m = property.value.length; j < m; j++) {
      type = property.value[j][0];
      value = property.value[j][1];

      if (type == Token$i.PROPERTY_BLOCK) {
        property.unused = true;
        context.warnings.push('Invalid value token at ' + formatPosition$1(value[0][1][2][0]) + '. Ignoring.');
        break;
      }

      if (startsAsUrl(value) && !context.validator.isUrl(value)) {
        property.unused = true;
        context.warnings.push('Broken URL \'' + value + '\' at ' + formatPosition$1(property.value[j][2][0]) + '. Ignoring.');
        break;
      }

      for (k = 0, n = valueOptimizers.length; k < n; k++) {
        value = valueOptimizers[k](name, value, options);
      }

      for (k = 0, n = pluginValueOptimizers.length; k < n; k++) {
        value = pluginValueOptimizers[k](name, value, options);
      }

      property.value[j][1] = value;
    }

    propertyOptimizer(serializedRule, property, options);

    for (j = 0, m = pluginPropertyOptimizers.length; j < m; j++) {
      pluginPropertyOptimizers[j](serializedRule, property, options);
    }
  }

  restoreFromOptimizing$4(_properties);
  removeUnused$1(_properties);
  removeComments(properties, options);
}

function removeComments(tokens, options) {
  var token;
  var i;

  for (i = 0; i < tokens.length; i++) {
    token = tokens[i];

    if (token[0] != Token$i.COMMENT) {
      continue;
    }

    optimizeComment(token, options);

    if (token[1].length === 0) {
      tokens.splice(i, 1);
      i--;
    }
  }
}

function optimizeComment(token, options) {
  if (token[1][2] == Marker$7.EXCLAMATION && (options.level[OptimizationLevel$6.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel$6.One].specialComments)) {
    options.commentsKept++;
    return;
  }

  token[1] = [];
}

function cleanupCharsets(tokens) {
  var hasCharset = false;

  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];

    if (token[0] != Token$i.AT_RULE)
      continue;

    if (!CHARSET_REGEXP.test(token[1]))
      continue;

    if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
      tokens.splice(i, 1);
      i--;
      l--;
    } else {
      hasCharset = true;
      tokens.splice(i, 1);
      tokens.unshift([Token$i.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
    }
  }
}

function buildUnitRegexp(options) {
  var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
  var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];

  otherUnits.forEach(function (unit) {
    if (options.compatibility.units[unit]) {
      units.push(unit);
    }
  });

  return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
}

function buildPrecisionOptions(roundingPrecision) {
  var precisionOptions = {
    matcher: null,
    units: {},
  };
  var optimizable = [];
  var unit;
  var value;

  for (unit in roundingPrecision) {
    value = roundingPrecision[unit];

    if (value != DEFAULT_ROUNDING_PRECISION) {
      precisionOptions.units[unit] = {};
      precisionOptions.units[unit].value = value;
      precisionOptions.units[unit].multiplier = Math.pow(10, value);

      optimizable.push(unit);
    }
  }

  if (optimizable.length > 0) {
    precisionOptions.enabled = true;
    precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\\W)', 'g');
    precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
  }

  return precisionOptions;
}

function level1Optimize$1(tokens, context) {
  var options = context.options;
  var levelOptions = options.level[OptimizationLevel$6.One];
  var ie7Hack = options.compatibility.selectors.ie7Hack;
  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
  var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
  var format = options.format;
  var mayHaveCharset = false;
  var afterRules = false;

  options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
  options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
  options.commentsKept = options.commentsKept || 0;

  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];

    switch (token[0]) {
      case Token$i.AT_RULE:
        token[1] = isImport$3(token) && afterRules ? '' : token[1];
        token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
        mayHaveCharset = true;
        break;
      case Token$i.AT_RULE_BLOCK:
        optimizeBody(token[1], token[2], context);
        afterRules = true;
        break;
      case Token$i.NESTED_BLOCK:
        token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
        level1Optimize$1(token[2], context);
        afterRules = true;
        break;
      case Token$i.COMMENT:
        optimizeComment(token, options);
        break;
      case Token$i.RULE:
        token[1] = levelOptions.tidySelectors ? tidyRules$2(token[1], !ie7Hack, adjacentSpace, format, context.warnings) : token[1];
        token[1] = token[1].length > 1 ? sortSelectors$2(token[1], levelOptions.selectorsSortingMethod) : token[1];
        optimizeBody(token[1], token[2], context);
        afterRules = true;
        break;
    }

    if (token[0] == Token$i.COMMENT && token[1].length === 0 || levelOptions.removeEmpty && (token[1].length === 0 || (token[2] && token[2].length === 0))) {
      tokens.splice(i, 1);
      i--;
      l--;
    }
  }

  if (levelOptions.cleanupCharsets && mayHaveCharset) {
    cleanupCharsets(tokens);
  }

  return tokens;
}

var optimize$3 = level1Optimize$1;

var Marker$6 = marker;
var split$1 = split_1;

var DEEP_SELECTOR_PATTERN = /\/deep\//;
var DOUBLE_COLON_PATTERN = /^::/;
var VENDOR_PREFIXED_PATTERN = /:(-moz-|-ms-|-o-|-webkit-)/;

var NOT_PSEUDO = ':not';
var PSEUDO_CLASSES_WITH_ARGUMENTS = [
  ':dir',
  ':lang',
  ':not',
  ':nth-child',
  ':nth-last-child',
  ':nth-last-of-type',
  ':nth-of-type'
];
var RELATION_PATTERN = /[>\+~]/;
var UNMIXABLE_PSEUDO_CLASSES = [
  ':after',
  ':before',
  ':first-letter',
  ':first-line',
  ':lang'
];
var UNMIXABLE_PSEUDO_ELEMENTS = [
  '::after',
  '::before',
  '::first-letter',
  '::first-line'
];

var Level$1 = {
  DOUBLE_QUOTE: 'double-quote',
  SINGLE_QUOTE: 'single-quote',
  ROOT: 'root'
};

function isMergeable$4(selector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
  var singleSelectors = split$1(selector, Marker$6.COMMA);
  var singleSelector;
  var i, l;

  for (i = 0, l = singleSelectors.length; i < l; i++) {
    singleSelector = singleSelectors[i];

    if (singleSelector.length === 0 ||
        isDeepSelector(singleSelector) ||
        isVendorPrefixed(singleSelector) ||
        (singleSelector.indexOf(Marker$6.COLON) > -1 && !areMergeable(singleSelector, extractPseudoFrom(singleSelector), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging))) {
      return false;
    }
  }

  return true;
}

function isDeepSelector(selector) {
  return DEEP_SELECTOR_PATTERN.test(selector);
}

function isVendorPrefixed(selector) {
  return VENDOR_PREFIXED_PATTERN.test(selector);
}

function extractPseudoFrom(selector) {
  var list = [];
  var character;
  var buffer = [];
  var level = Level$1.ROOT;
  var roundBracketLevel = 0;
  var isQuoted;
  var isEscaped;
  var isPseudo = false;
  var isRelation;
  var wasColon = false;
  var index;
  var len;

  for (index = 0, len = selector.length; index < len; index++) {
    character = selector[index];

    isRelation = !isEscaped && RELATION_PATTERN.test(character);
    isQuoted = level == Level$1.DOUBLE_QUOTE || level == Level$1.SINGLE_QUOTE;

    if (isEscaped) {
      buffer.push(character);
    } else if (character == Marker$6.DOUBLE_QUOTE && level == Level$1.ROOT) {
      buffer.push(character);
      level = Level$1.DOUBLE_QUOTE;
    } else if (character == Marker$6.DOUBLE_QUOTE && level == Level$1.DOUBLE_QUOTE) {
      buffer.push(character);
      level = Level$1.ROOT;
    } else if (character == Marker$6.SINGLE_QUOTE && level == Level$1.ROOT) {
      buffer.push(character);
      level = Level$1.SINGLE_QUOTE;
    } else if (character == Marker$6.SINGLE_QUOTE && level == Level$1.SINGLE_QUOTE) {
      buffer.push(character);
      level = Level$1.ROOT;
    } else if (isQuoted) {
      buffer.push(character);
    } else if (character == Marker$6.OPEN_ROUND_BRACKET) {
      buffer.push(character);
      roundBracketLevel++;
    } else if (character == Marker$6.CLOSE_ROUND_BRACKET && roundBracketLevel == 1 && isPseudo) {
      buffer.push(character);
      list.push(buffer.join(''));
      roundBracketLevel--;
      buffer = [];
      isPseudo = false;
    } else if (character == Marker$6.CLOSE_ROUND_BRACKET) {
      buffer.push(character);
      roundBracketLevel--;
    } else if (character == Marker$6.COLON && roundBracketLevel === 0 && isPseudo && !wasColon) {
      list.push(buffer.join(''));
      buffer = [];
      buffer.push(character);
    } else if (character == Marker$6.COLON && roundBracketLevel === 0 && !wasColon) {
      buffer = [];
      buffer.push(character);
      isPseudo = true;
    } else if (character == Marker$6.SPACE && roundBracketLevel === 0 && isPseudo) {
      list.push(buffer.join(''));
      buffer = [];
      isPseudo = false;
    } else if (isRelation && roundBracketLevel === 0 && isPseudo) {
      list.push(buffer.join(''));
      buffer = [];
      isPseudo = false;
    } else {
      buffer.push(character);
    }

    isEscaped = character == Marker$6.BACK_SLASH;
    wasColon = character == Marker$6.COLON;
  }

  if (buffer.length > 0 && isPseudo) {
    list.push(buffer.join(''));
  }

  return list;
}

function areMergeable(selector, matches, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
  return areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) &&
    needArguments(matches) &&
    (matches.length < 2 || !someIncorrectlyChained(selector, matches)) &&
    (matches.length < 2 || multiplePseudoMerging && allMixable(matches));
}

function areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) {
  var match;
  var name;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];
    name = match.indexOf(Marker$6.OPEN_ROUND_BRACKET) > -1 ?
      match.substring(0, match.indexOf(Marker$6.OPEN_ROUND_BRACKET)) :
      match;

    if (mergeablePseudoClasses.indexOf(name) === -1 && mergeablePseudoElements.indexOf(name) === -1) {
      return false;
    }
  }

  return true;
}

function needArguments(matches) {
  var match;
  var name;
  var bracketOpensAt;
  var hasArguments;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];

    bracketOpensAt = match.indexOf(Marker$6.OPEN_ROUND_BRACKET);
    hasArguments = bracketOpensAt > -1;
    name = hasArguments ?
      match.substring(0, bracketOpensAt) :
      match;

    if (hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) == -1) {
      return false;
    }

    if (!hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) > -1) {
      return false;
    }
  }

  return true;
}

function someIncorrectlyChained(selector, matches) {
  var positionInSelector = 0;
  var match;
  var matchAt;
  var nextMatch;
  var nextMatchAt;
  var name;
  var nextName;
  var areChained;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];
    nextMatch = matches[i + 1];

    if (!nextMatch) {
      break;
    }

    matchAt = selector.indexOf(match, positionInSelector);
    nextMatchAt = selector.indexOf(match, matchAt + 1);
    positionInSelector = nextMatchAt;
    areChained = matchAt + match.length == nextMatchAt;

    if (areChained) {
      name = match.indexOf(Marker$6.OPEN_ROUND_BRACKET) > -1 ?
        match.substring(0, match.indexOf(Marker$6.OPEN_ROUND_BRACKET)) :
        match;
      nextName = nextMatch.indexOf(Marker$6.OPEN_ROUND_BRACKET) > -1 ?
        nextMatch.substring(0, nextMatch.indexOf(Marker$6.OPEN_ROUND_BRACKET)) :
        nextMatch;

      if (name != NOT_PSEUDO || nextName != NOT_PSEUDO) {
        return true;
      }
    }
  }

  return false;
}

function allMixable(matches) {
  var unmixableMatches = 0;
  var match;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];

    if (isPseudoElement(match)) {
      unmixableMatches += UNMIXABLE_PSEUDO_ELEMENTS.indexOf(match) > -1 ? 1 : 0;
    } else {
      unmixableMatches += UNMIXABLE_PSEUDO_CLASSES.indexOf(match) > -1 ? 1 : 0;
    }

    if (unmixableMatches > 1) {
      return false;
    }
  }

  return true;
}

function isPseudoElement(pseudo) {
  return DOUBLE_COLON_PATTERN.test(pseudo);
}

var isMergeable_1 = isMergeable$4;

var Marker$5 = marker;

function everyValuesPair$2(fn, left, right) {
  var leftSize = left.value.length;
  var rightSize = right.value.length;
  var total = Math.max(leftSize, rightSize);
  var lowerBound = Math.min(leftSize, rightSize) - 1;
  var leftValue;
  var rightValue;
  var position;

  for (position = 0; position < total; position++) {
    leftValue = left.value[position] && left.value[position][1] || leftValue;
    rightValue = right.value[position] && right.value[position][1] || rightValue;

    if (leftValue == Marker$5.COMMA || rightValue == Marker$5.COMMA) {
      continue;
    }

    if (!fn(leftValue, rightValue, position, position <= lowerBound)) {
      return false;
    }
  }

  return true;
}

var everyValuesPair_1 = everyValuesPair$2;

function hasInherit$2(property) {
  for (var i = property.value.length - 1; i >= 0; i--) {
    if (property.value[i][1] == 'inherit')
      return true;
  }

  return false;
}

var hasInherit_1 = hasInherit$2;

function hasSameValues$1(property) {
  var firstValue = property.value[0][1];
  var i, l;

  for (i = 1, l = property.value.length; i < l; i++) {
    if (property.value[i][1] != firstValue) {
      return false;
    }
  }

  return true;
}

var hasSameValues_1 = hasSameValues$1;

var configuration$6 = configuration_1;
var InvalidPropertyError = invalidPropertyError;

function populateComponents$3(properties, validator, warnings) {
  var component;
  var j, m;

  for (var i = properties.length - 1; i >= 0; i--) {
    var property = properties[i];
    var descriptor = configuration$6[property.name];

    if (!property.dynamic && descriptor && descriptor.shorthand) {
      if (onlyValueIsVariable(property, validator) || moreThanOneValueIsVariable(property, validator)) {
        property.optimizable = false;
        continue;
      }

      property.shorthand = true;
      property.dirty = true;

      try {
        property.components = descriptor.breakUp(property, configuration$6, validator);

        if (descriptor.shorthandComponents) {
          for (j = 0, m = property.components.length; j < m; j++) {
            component = property.components[j];
            component.components = configuration$6[component.name].breakUp(component, configuration$6, validator);
          }
        }
      } catch (e) {
        if (e instanceof InvalidPropertyError) {
          property.components = []; // this will set property.unused to true below
          warnings.push(e.message);
        } else {
          throw e;
        }
      }

      if (property.components.length > 0)
        property.multiplex = property.components[0].multiplex;
      else
        property.unused = true;
    }
  }
}

function onlyValueIsVariable(property, validator) {
  return property.value.length == 1 && validator.isVariable(property.value[0][1]);
}

function moreThanOneValueIsVariable(property, validator) {
  return property.value.length > 1 && property.value.filter(function (value) { return validator.isVariable(value[1]); }).length > 1;
}

var populateComponents_1 = populateComponents$3;

var configuration$5 = configuration_1;

function restoreWithComponents$3(property) {
  var descriptor = configuration$5[property.name];

  if (descriptor && descriptor.shorthand) {
    return descriptor.restore(property, configuration$5);
  } else {
    return property.value;
  }
}

var restoreWithComponents_1 = restoreWithComponents$3;

var everyValuesPair$1 = everyValuesPair_1;
var hasInherit$1 = hasInherit_1;
var hasSameValues = hasSameValues_1;
var populateComponents$2 = populateComponents_1;

var configuration$4 = configuration_1;
var deepClone$1 = clone$1.deep;
var restoreWithComponents$2 = restoreWithComponents_1;

var restoreFromOptimizing$3 = restoreFromOptimizing_1;
var wrapSingle = wrapForOptimizing$3.single;

var serializeBody$5 = oneTime.body;
var Token$h = token;

function mergeIntoShorthands$1(properties, validator) {
  var candidates = {};
  var descriptor;
  var componentOf;
  var property;
  var i, l;
  var j, m;

  // there is no shorthand property made up of less than 3 longhands
  if (properties.length < 3) {
    return;
  }

  for (i = 0, l = properties.length; i < l; i++) {
    property = properties[i];
    descriptor = configuration$4[property.name];

    if (property.dynamic) {
      continue;
    }

    if (property.unused) {
      continue;
    }

    if (property.hack) {
      continue;
    }

    if (property.block) {
      continue;
    }

    if (descriptor && descriptor.singleTypeComponents && !hasSameValues(property)) {
      continue;
    }

    invalidateOrCompact(properties, i, candidates, validator);

    if (descriptor && descriptor.componentOf) {
      for (j = 0, m = descriptor.componentOf.length; j < m; j++) {
        componentOf = descriptor.componentOf[j];

        candidates[componentOf] = candidates[componentOf] || {};
        candidates[componentOf][property.name] = property;
      }
    }
  }

  invalidateOrCompact(properties, i, candidates, validator);
}

function invalidateOrCompact(properties, position, candidates, validator) {
  var invalidatedBy = properties[position];
  var shorthandName;
  var shorthandDescriptor;
  var candidateComponents;
  var replacedCandidates = [];
  var i;

  for (shorthandName in candidates) {
    if (undefined !== invalidatedBy && shorthandName == invalidatedBy.name) {
      continue;
    }

    shorthandDescriptor = configuration$4[shorthandName];
    candidateComponents = candidates[shorthandName];
    if (invalidatedBy && invalidates(candidates, shorthandName, invalidatedBy)) {
      delete candidates[shorthandName];
      continue;
    }

    if (shorthandDescriptor.components.length > Object.keys(candidateComponents).length) {
      continue;
    }

    if (mixedImportance(candidateComponents)) {
      continue;
    }

    if (!overridable(candidateComponents, shorthandName, validator)) {
      continue;
    }

    if (!mergeable(candidateComponents)) {
      continue;
    }

    if (mixedInherit(candidateComponents)) {
      replaceWithInheritBestFit(properties, candidateComponents, shorthandName, validator);
    } else {
      replaceWithShorthand(properties, candidateComponents, shorthandName, validator);
    }

    replacedCandidates.push(shorthandName);
  }

  for (i = replacedCandidates.length - 1; i >= 0; i--) {
    delete candidates[replacedCandidates[i]];
  }
}

function invalidates(candidates, shorthandName, invalidatedBy) {
  var shorthandDescriptor = configuration$4[shorthandName];
  var invalidatedByDescriptor = configuration$4[invalidatedBy.name];
  var componentName;

  if ('overridesShorthands' in shorthandDescriptor && shorthandDescriptor.overridesShorthands.indexOf(invalidatedBy.name) > -1) {
    return true;
  }

  if (invalidatedByDescriptor && 'componentOf' in invalidatedByDescriptor) {
    for (componentName in candidates[shorthandName]) {
      if (invalidatedByDescriptor.componentOf.indexOf(componentName) > -1) {
        return true;
      }
    }
  }

  return false;
}

function mixedImportance(components) {
  var important;
  var componentName;

  for (componentName in components) {
    if (undefined !== important && components[componentName].important != important) {
      return true;
    }

    important = components[componentName].important;
  }

  return false;
}

function overridable(components, shorthandName, validator) {
  var descriptor = configuration$4[shorthandName];
  var newValuePlaceholder = [
    Token$h.PROPERTY,
    [Token$h.PROPERTY_NAME, shorthandName],
    [Token$h.PROPERTY_VALUE, descriptor.defaultValue]
  ];
  var newProperty = wrapSingle(newValuePlaceholder);
  var component;
  var mayOverride;
  var i, l;

  populateComponents$2([newProperty], validator, []);

  for (i = 0, l = descriptor.components.length; i < l; i++) {
    component = components[descriptor.components[i]];
    mayOverride = configuration$4[component.name].canOverride || sameValue$1;

    if (!everyValuesPair$1(mayOverride.bind(null, validator), newProperty.components[i], component)) {
      return false;
    }
  }

  return true;
}

function sameValue$1(_validator, value1, value2) {
  return value1 === value2;
}

function mergeable(components) {
  var lastCount = null;
  var currentCount;
  var componentName;
  var component;
  var descriptor;
  var values;

  for (componentName in components) {
    component = components[componentName];
    descriptor = configuration$4[componentName];

    if (!('restore' in descriptor)) {
      continue;
    }

    restoreFromOptimizing$3([component.all[component.position]], restoreWithComponents$2);
    values = descriptor.restore(component, configuration$4);

    currentCount = values.length;

    if (lastCount !== null && currentCount !== lastCount) {
      return false;
    }

    lastCount = currentCount;
  }

  return true;
}

function mixedInherit(components) {
  var componentName;
  var lastValue = null;
  var currentValue;

  for (componentName in components) {
    currentValue = hasInherit$1(components[componentName]);

    if (lastValue !== null && lastValue !== currentValue) {
      return true;
    }

    lastValue = currentValue;
  }

  return false;
}

function replaceWithInheritBestFit(properties, candidateComponents, shorthandName, validator) {
  var viaLonghands = buildSequenceWithInheritLonghands(candidateComponents, shorthandName, validator);
  var viaShorthand = buildSequenceWithInheritShorthand(candidateComponents, shorthandName, validator);
  var longhandTokensSequence = viaLonghands[0];
  var shorthandTokensSequence = viaShorthand[0];
  var isLonghandsShorter = serializeBody$5(longhandTokensSequence).length < serializeBody$5(shorthandTokensSequence).length;
  var newTokensSequence = isLonghandsShorter ? longhandTokensSequence : shorthandTokensSequence;
  var newProperty = isLonghandsShorter ? viaLonghands[1] : viaShorthand[1];
  var newComponents = isLonghandsShorter ? viaLonghands[2] : viaShorthand[2];
  var lastComponent = candidateComponents[Object.keys(candidateComponents).pop()];
  var all = lastComponent.all;
  var insertAt = lastComponent.position;
  var componentName;
  var oldComponent;
  var newComponent;
  var newToken;

  newProperty.position = insertAt;
  newProperty.shorthand = true;
  newProperty.important = lastComponent.important;
  newProperty.multiplex = false;
  newProperty.dirty = true;
  newProperty.all = all;
  newProperty.all[insertAt] = newTokensSequence[0];

  properties.splice(insertAt, 1, newProperty);

  for (componentName in candidateComponents) {
    oldComponent = candidateComponents[componentName];
    oldComponent.unused = true;

    newProperty.multiplex = newProperty.multiplex || oldComponent.multiplex;

    if (oldComponent.name in newComponents) {
      newComponent = newComponents[oldComponent.name];
      newToken = findTokenIn(newTokensSequence, componentName);

      newComponent.position = all.length;
      newComponent.all = all;
      newComponent.all.push(newToken);

      properties.push(newComponent);
    }
  }
}

function buildSequenceWithInheritLonghands(components, shorthandName, validator) {
  var tokensSequence = [];
  var inheritComponents = {};
  var nonInheritComponents = {};
  var descriptor = configuration$4[shorthandName];
  var shorthandToken = [
    Token$h.PROPERTY,
    [Token$h.PROPERTY_NAME, shorthandName],
    [Token$h.PROPERTY_VALUE, descriptor.defaultValue]
  ];
  var newProperty = wrapSingle(shorthandToken);
  var component;
  var longhandToken;
  var newComponent;
  var nameMetadata;
  var i, l;

  populateComponents$2([newProperty], validator, []);

  for (i = 0, l = descriptor.components.length; i < l; i++) {
    component = components[descriptor.components[i]];

    if (hasInherit$1(component)) {
      longhandToken = component.all[component.position].slice(0, 2);
      Array.prototype.push.apply(longhandToken, component.value);
      tokensSequence.push(longhandToken);

      newComponent = deepClone$1(component);
      newComponent.value = inferComponentValue(components, newComponent.name);

      newProperty.components[i] = newComponent;
      inheritComponents[component.name] = deepClone$1(component);
    } else {
      newComponent = deepClone$1(component);
      newComponent.all = component.all;
      newProperty.components[i] = newComponent;

      nonInheritComponents[component.name] = component;
    }
  }

  newProperty.important = components[Object.keys(components).pop()].important;

  nameMetadata = joinMetadata(nonInheritComponents, 1);
  shorthandToken[1].push(nameMetadata);

  restoreFromOptimizing$3([newProperty], restoreWithComponents$2);

  shorthandToken = shorthandToken.slice(0, 2);
  Array.prototype.push.apply(shorthandToken, newProperty.value);

  tokensSequence.unshift(shorthandToken);

  return [tokensSequence, newProperty, inheritComponents];
}

function inferComponentValue(components, propertyName) {
  var descriptor = configuration$4[propertyName];

  if ('oppositeTo' in descriptor) {
    return components[descriptor.oppositeTo].value;
  } else {
    return [[Token$h.PROPERTY_VALUE, descriptor.defaultValue]];
  }
}

function joinMetadata(components, at) {
  var metadata = [];
  var component;
  var originalValue;
  var componentMetadata;
  var componentName;

  for (componentName in components) {
    component = components[componentName];
    originalValue = component.all[component.position];
    componentMetadata = originalValue[at][originalValue[at].length - 1];

    Array.prototype.push.apply(metadata, componentMetadata);
  }

  return metadata.sort(metadataSorter);
}

function metadataSorter(metadata1, metadata2) {
  var line1 = metadata1[0];
  var line2 = metadata2[0];
  var column1 = metadata1[1];
  var column2 = metadata2[1];

  if (line1 < line2) {
    return -1;
  } else if (line1 === line2) {
    return column1 < column2 ? -1 : 1;
  } else {
    return 1;
  }
}

function buildSequenceWithInheritShorthand(components, shorthandName, validator) {
  var tokensSequence = [];
  var inheritComponents = {};
  var nonInheritComponents = {};
  var descriptor = configuration$4[shorthandName];
  var shorthandToken = [
    Token$h.PROPERTY,
    [Token$h.PROPERTY_NAME, shorthandName],
    [Token$h.PROPERTY_VALUE, 'inherit']
  ];
  var newProperty = wrapSingle(shorthandToken);
  var component;
  var longhandToken;
  var nameMetadata;
  var valueMetadata;
  var i, l;

  populateComponents$2([newProperty], validator, []);

  for (i = 0, l = descriptor.components.length; i < l; i++) {
    component = components[descriptor.components[i]];

    if (hasInherit$1(component)) {
      inheritComponents[component.name] = component;
    } else {
      longhandToken = component.all[component.position].slice(0, 2);
      Array.prototype.push.apply(longhandToken, component.value);
      tokensSequence.push(longhandToken);

      nonInheritComponents[component.name] = deepClone$1(component);
    }
  }

  nameMetadata = joinMetadata(inheritComponents, 1);
  shorthandToken[1].push(nameMetadata);

  valueMetadata = joinMetadata(inheritComponents, 2);
  shorthandToken[2].push(valueMetadata);

  tokensSequence.unshift(shorthandToken);

  return [tokensSequence, newProperty, nonInheritComponents];
}

function findTokenIn(tokens, componentName) {
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    if (tokens[i][1][1] == componentName) {
      return tokens[i];
    }
  }
}

function replaceWithShorthand(properties, candidateComponents, shorthandName, validator) {
  var descriptor = configuration$4[shorthandName];
  var nameMetadata;
  var valueMetadata;
  var newValuePlaceholder = [
    Token$h.PROPERTY,
    [Token$h.PROPERTY_NAME, shorthandName],
    [Token$h.PROPERTY_VALUE, descriptor.defaultValue]
  ];
  var all;
  var insertAt = inferInsertAtFrom(properties, candidateComponents, shorthandName);

  var newProperty = wrapSingle(newValuePlaceholder);
  newProperty.shorthand = true;
  newProperty.dirty = true;
  newProperty.multiplex = false;

  populateComponents$2([newProperty], validator, []);

  for (var i = 0, l = descriptor.components.length; i < l; i++) {
    var component = candidateComponents[descriptor.components[i]];

    newProperty.components[i] = deepClone$1(component);
    newProperty.important = component.important;
    newProperty.multiplex = newProperty.multiplex || component.multiplex;

    all = component.all;
  }

  for (var componentName in candidateComponents) {
    candidateComponents[componentName].unused = true;
  }

  nameMetadata = joinMetadata(candidateComponents, 1);
  newValuePlaceholder[1].push(nameMetadata);

  valueMetadata = joinMetadata(candidateComponents, 2);
  newValuePlaceholder[2].push(valueMetadata);

  newProperty.position = insertAt;
  newProperty.all = all;
  newProperty.all[insertAt] = newValuePlaceholder;

  properties.splice(insertAt, 1, newProperty);
}

function inferInsertAtFrom(properties, candidateComponents, shorthandName) {
  var candidateComponentNames = Object.keys(candidateComponents);
  var firstCandidatePosition = candidateComponents[candidateComponentNames[0]].position;
  var lastCandidatePosition = candidateComponents[candidateComponentNames[candidateComponentNames.length - 1]].position;

  if (shorthandName == 'border' && traversesVia(properties.slice(firstCandidatePosition, lastCandidatePosition), 'border-image')) {
    return firstCandidatePosition;
  } else {
    return lastCandidatePosition;
  }
}

function traversesVia(properties, propertyName) {
  for (var i = properties.length - 1; i >= 0; i--) {
    if (properties[i].name == propertyName) {
      return true;
    }
  }

  return false;
}

var mergeIntoShorthands_1 = mergeIntoShorthands$1;

function hasUnset$1(property) {
  for (var i = property.value.length - 1; i >= 0; i--) {
    if (property.value[i][1] == 'unset')
      return true;
  }

  return false;
}

var hasUnset_1 = hasUnset$1;

var configuration$3 = configuration_1;

function findComponentIn$1(shorthand, longhand) {
  var comparator = nameComparator(longhand);

  return findInDirectComponents(shorthand, comparator) || findInSubComponents(shorthand, comparator);
}

function nameComparator(to) {
  return function (property) {
    return to.name === property.name;
  };
}

function findInDirectComponents(shorthand, comparator) {
  return shorthand.components.filter(comparator)[0];
}

function findInSubComponents(shorthand, comparator) {
  var shorthandComponent;
  var longhandMatch;
  var i, l;

  if (!configuration$3[shorthand.name].shorthandComponents) {
    return;
  }

  for (i = 0, l = shorthand.components.length; i < l; i++) {
    shorthandComponent = shorthand.components[i];
    longhandMatch = findInDirectComponents(shorthandComponent, comparator);

    if (longhandMatch) {
      return longhandMatch;
    }
  }

  return;
}

var findComponentIn_1 = findComponentIn$1;

var configuration$2 = configuration_1;

function isComponentOf$1(property1, property2, shallow) {
  return isDirectComponentOf(property1, property2) ||
    !shallow && !!configuration$2[property1.name].shorthandComponents && isSubComponentOf(property1, property2);
}

function isDirectComponentOf(property1, property2) {
  var descriptor = configuration$2[property1.name];

  return 'components' in descriptor && descriptor.components.indexOf(property2.name) > -1;
}

function isSubComponentOf(property1, property2) {
  return property1
    .components
    .some(function (component) {
      return isDirectComponentOf(component, property2);
    });
}

var isComponentOf_1 = isComponentOf$1;

var Marker$4 = marker;

function isMergeableShorthand$1(shorthand) {
  if (shorthand.name != 'font') {
    return true;
  }

  return shorthand.value[0][1].indexOf(Marker$4.INTERNAL) == -1;
}

var isMergeableShorthand_1 = isMergeableShorthand$1;

var configuration$1 = configuration_1;

function overridesNonComponentShorthand$1(property1, property2) {
  return property1.name in configuration$1 &&
    'overridesShorthands' in configuration$1[property1.name] &&
    configuration$1[property1.name].overridesShorthands.indexOf(property2.name) > -1;
}

var overridesNonComponentShorthand_1 = overridesNonComponentShorthand$1;

var hasInherit = hasInherit_1;
var hasUnset = hasUnset_1;
var everyValuesPair = everyValuesPair_1;
var findComponentIn = findComponentIn_1;
var isComponentOf = isComponentOf_1;
var isMergeableShorthand = isMergeableShorthand_1;
var overridesNonComponentShorthand = overridesNonComponentShorthand_1;
var sameVendorPrefixesIn = vendorPrefixes.same;

var configuration = configuration_1;
var deepClone = clone$1.deep;
var restoreWithComponents$1 = restoreWithComponents_1;
var shallowClone = clone$1.shallow;

var restoreFromOptimizing$2 = restoreFromOptimizing_1;

var Token$g = token;
var Marker$3 = marker;

var serializeProperty = oneTime.property;

function sameValue(_validator, value1, value2) {
  return value1 === value2;
}

function wouldBreakCompatibility(property, validator) {
  for (var i = 0; i < property.components.length; i++) {
    var component = property.components[i];
    var descriptor = configuration[component.name];
    var canOverride = descriptor && descriptor.canOverride || sameValue;

    var _component = shallowClone(component);
    _component.value = [[Token$g.PROPERTY_VALUE, descriptor.defaultValue]];

    if (!everyValuesPair(canOverride.bind(null, validator), _component, component)) {
      return true;
    }
  }

  return false;
}

function overrideIntoMultiplex(property, by) {
  by.unused = true;

  turnIntoMultiplex(by, multiplexSize(property));
  property.value = by.value;
}

function overrideByMultiplex(property, by) {
  by.unused = true;
  property.multiplex = true;
  property.value = by.value;
}

function overrideSimple(property, by) {
  by.unused = true;
  property.value = by.value;
}

function override$2(property, by) {
  if (by.multiplex)
    overrideByMultiplex(property, by);
  else if (property.multiplex)
    overrideIntoMultiplex(property, by);
  else
    overrideSimple(property, by);
}

function overrideShorthand(property, by) {
  by.unused = true;

  for (var i = 0, l = property.components.length; i < l; i++) {
    override$2(property.components[i], by.components[i]);
  }
}

function turnIntoMultiplex(property, size) {
  property.multiplex = true;

  if (configuration[property.name].shorthand) {
    turnShorthandValueIntoMultiplex(property, size);
  } else {
    turnLonghandValueIntoMultiplex(property, size);
  }
}

function turnShorthandValueIntoMultiplex(property, size) {
  var component;
  var i, l;

  for (i = 0, l = property.components.length; i < l; i++) {
    component = property.components[i];

    if (!component.multiplex) {
      turnLonghandValueIntoMultiplex(component, size);
    }
  }
}

function turnLonghandValueIntoMultiplex(property, size) {
  var descriptor = configuration[property.name];
  var withRealValue = descriptor.intoMultiplexMode == 'real';
  var withValue = descriptor.intoMultiplexMode == 'real' ?
    property.value.slice(0) :
    (descriptor.intoMultiplexMode == 'placeholder' ? descriptor.placeholderValue : descriptor.defaultValue);
  var i = multiplexSize(property);
  var j;
  var m = withValue.length;

  for (; i < size; i++) {
    property.value.push([Token$g.PROPERTY_VALUE, Marker$3.COMMA]);

    if (Array.isArray(withValue)) {
      for (j = 0; j < m; j++) {
        property.value.push(withRealValue ? withValue[j] : [Token$g.PROPERTY_VALUE, withValue[j]]);
      }
    } else {
      property.value.push(withRealValue ? withValue : [Token$g.PROPERTY_VALUE, withValue]);
    }
  }
}

function multiplexSize(component) {
  var size = 0;

  for (var i = 0, l = component.value.length; i < l; i++) {
    if (component.value[i][1] == Marker$3.COMMA)
      size++;
  }

  return size + 1;
}

function lengthOf(property) {
  var fakeAsArray = [
    Token$g.PROPERTY,
    [Token$g.PROPERTY_NAME, property.name]
  ].concat(property.value);
  return serializeProperty([fakeAsArray], 0).length;
}

function moreSameShorthands(properties, startAt, name) {
  // Since we run the main loop in `compactOverrides` backwards, at this point some
  // properties may not be marked as unused.
  // We should consider reverting the order if possible
  var count = 0;

  for (var i = startAt; i >= 0; i--) {
    if (properties[i].name == name && !properties[i].unused)
      count++;
    if (count > 1)
      break;
  }

  return count > 1;
}

function overridingFunction(shorthand, validator) {
  for (var i = 0, l = shorthand.components.length; i < l; i++) {
    if (!anyValue(validator.isUrl, shorthand.components[i]) && anyValue(validator.isFunction, shorthand.components[i])) {
      return true;
    }
  }

  return false;
}

function anyValue(fn, property) {
  for (var i = 0, l = property.value.length; i < l; i++) {
    if (property.value[i][1] == Marker$3.COMMA)
      continue;

    if (fn(property.value[i][1]))
      return true;
  }

  return false;
}

function wouldResultInLongerValue(left, right) {
  if (!left.multiplex && !right.multiplex || left.multiplex && right.multiplex)
    return false;

  var multiplex = left.multiplex ? left : right;
  var simple = left.multiplex ? right : left;
  var component;

  var multiplexClone = deepClone(multiplex);
  restoreFromOptimizing$2([multiplexClone], restoreWithComponents$1);

  var simpleClone = deepClone(simple);
  restoreFromOptimizing$2([simpleClone], restoreWithComponents$1);

  var lengthBefore = lengthOf(multiplexClone) + 1 + lengthOf(simpleClone);

  if (left.multiplex) {
    component = findComponentIn(multiplexClone, simpleClone);
    overrideIntoMultiplex(component, simpleClone);
  } else {
    component = findComponentIn(simpleClone, multiplexClone);
    turnIntoMultiplex(simpleClone, multiplexSize(multiplexClone));
    overrideByMultiplex(component, multiplexClone);
  }

  restoreFromOptimizing$2([simpleClone], restoreWithComponents$1);

  var lengthAfter = lengthOf(simpleClone);

  return lengthBefore <= lengthAfter;
}

function isCompactable(property) {
  return property.name in configuration;
}

function noneOverrideHack(left, right) {
  return !left.multiplex &&
    (left.name == 'background' || left.name == 'background-image') &&
    right.multiplex &&
    (right.name == 'background' || right.name == 'background-image') &&
    anyLayerIsNone(right.value);
}

function anyLayerIsNone(values) {
  var layers = intoLayers(values);

  for (var i = 0, l = layers.length; i < l; i++) {
    if (layers[i].length == 1 && layers[i][0][1] == 'none')
      return true;
  }

  return false;
}

function intoLayers(values) {
  var layers = [];

  for (var i = 0, layer = [], l = values.length; i < l; i++) {
    var value = values[i];
    if (value[1] == Marker$3.COMMA) {
      layers.push(layer);
      layer = [];
    } else {
      layer.push(value);
    }
  }

  layers.push(layer);
  return layers;
}

function overrideProperties$1(properties, withMerging, compatibility, validator) {
  var mayOverride, right, left, component;
  var overriddenComponents;
  var overriddenComponent;
  var overridingComponent;
  var overridable;
  var i, j, k;

  propertyLoop:
  for (i = properties.length - 1; i >= 0; i--) {
    right = properties[i];

    if (!isCompactable(right))
      continue;

    if (right.block)
      continue;

    mayOverride = configuration[right.name].canOverride || sameValue;

    traverseLoop:
    for (j = i - 1; j >= 0; j--) {
      left = properties[j];

      if (!isCompactable(left))
        continue;

      if (left.block)
        continue;

      if (left.dynamic || right.dynamic)
        continue;

      if (left.unused || right.unused)
        continue;

      if (left.hack && !right.hack && !right.important || !left.hack && !left.important && right.hack)
        continue;

      if (left.important == right.important && left.hack[0] != right.hack[0])
        continue;

      if (left.important == right.important && (left.hack[0] != right.hack[0] || (left.hack[1] && left.hack[1] != right.hack[1])))
        continue;

      if (hasInherit(right))
        continue;

      if (noneOverrideHack(left, right))
        continue;

      if (right.shorthand && isComponentOf(right, left)) {
        // maybe `left` can be overridden by `right` which is a shorthand?
        if (!right.important && left.important)
          continue;

        if (!sameVendorPrefixesIn([left], right.components))
          continue;

        if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator))
          continue;

        if (!isMergeableShorthand(right)) {
          left.unused = true;
          continue;
        }

        component = findComponentIn(right, left);
        mayOverride = configuration[left.name].canOverride || sameValue;
        if (everyValuesPair(mayOverride.bind(null, validator), left, component)) {
          left.unused = true;
        }
      } else if (right.shorthand && overridesNonComponentShorthand(right, left)) {
        // `right` is a shorthand while `left` can be overriden by it, think `border` and `border-top`
        if (!right.important && left.important) {
          continue;
        }

        if (!sameVendorPrefixesIn([left], right.components)) {
          continue;
        }

        if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator)) {
          continue;
        }

        overriddenComponents = left.shorthand ?
          left.components:
          [left];

        for (k = overriddenComponents.length - 1; k >= 0; k--) {
          overriddenComponent = overriddenComponents[k];
          overridingComponent = findComponentIn(right, overriddenComponent);
          mayOverride = configuration[overriddenComponent.name].canOverride || sameValue;

          if (!everyValuesPair(mayOverride.bind(null, validator), left, overridingComponent)) {
            continue traverseLoop;
          }
        }

        left.unused = true;
      } else if (withMerging && left.shorthand && !right.shorthand && isComponentOf(left, right, true)) {
        // maybe `right` can be pulled into `left` which is a shorthand?
        if (right.important && !left.important)
          continue;

        if (!right.important && left.important) {
          right.unused = true;
          continue;
        }

        // Pending more clever algorithm in #527
        if (moreSameShorthands(properties, i - 1, left.name))
          continue;

        if (overridingFunction(left, validator))
          continue;

        if (!isMergeableShorthand(left))
          continue;

        if (hasUnset(left) || hasUnset(right))
          continue;

        component = findComponentIn(left, right);
        if (everyValuesPair(mayOverride.bind(null, validator), component, right)) {
          var disabledBackgroundMerging =
            !compatibility.properties.backgroundClipMerging && component.name.indexOf('background-clip') > -1 ||
            !compatibility.properties.backgroundOriginMerging && component.name.indexOf('background-origin') > -1 ||
            !compatibility.properties.backgroundSizeMerging && component.name.indexOf('background-size') > -1;
          var nonMergeableValue = configuration[right.name].nonMergeableValue === right.value[0][1];

          if (disabledBackgroundMerging || nonMergeableValue)
            continue;

          if (!compatibility.properties.merging && wouldBreakCompatibility(left, validator))
            continue;

          if (component.value[0][1] != right.value[0][1] && (hasInherit(left) || hasInherit(right)))
            continue;

          if (wouldResultInLongerValue(left, right))
            continue;

          if (!left.multiplex && right.multiplex)
            turnIntoMultiplex(left, multiplexSize(right));

          override$2(component, right);
          left.dirty = true;
        }
      } else if (withMerging && left.shorthand && right.shorthand && left.name == right.name) {
        // merge if all components can be merged

        if (!left.multiplex && right.multiplex)
          continue;

        if (!right.important && left.important) {
          right.unused = true;
          continue propertyLoop;
        }

        if (right.important && !left.important) {
          left.unused = true;
          continue;
        }

        if (!isMergeableShorthand(right)) {
          left.unused = true;
          continue;
        }

        for (k = left.components.length - 1; k >= 0; k--) {
          var leftComponent = left.components[k];
          var rightComponent = right.components[k];

          mayOverride = configuration[leftComponent.name].canOverride || sameValue;
          if (!everyValuesPair(mayOverride.bind(null, validator), leftComponent, rightComponent))
            continue propertyLoop;
        }

        overrideShorthand(left, right);
        left.dirty = true;
      } else if (withMerging && left.shorthand && right.shorthand && isComponentOf(left, right)) {
        // border is a shorthand but any of its components is a shorthand too

        if (!left.important && right.important)
          continue;

        component = findComponentIn(left, right);
        mayOverride = configuration[right.name].canOverride || sameValue;
        if (!everyValuesPair(mayOverride.bind(null, validator), component, right))
          continue;

        if (left.important && !right.important) {
          right.unused = true;
          continue;
        }

        var rightRestored = configuration[right.name].restore(right, configuration);
        if (rightRestored.length > 1)
          continue;

        component = findComponentIn(left, right);
        override$2(component, right);
        right.dirty = true;
      } else if (left.name == right.name) {
        // two non-shorthands should be merged based on understandability
        overridable = true;

        if (right.shorthand) {
          for (k = right.components.length - 1; k >= 0 && overridable; k--) {
            overriddenComponent = left.components[k];
            overridingComponent = right.components[k];
            mayOverride = configuration[overridingComponent.name].canOverride || sameValue;

            overridable = everyValuesPair(mayOverride.bind(null, validator), overriddenComponent, overridingComponent);
          }
        } else {
          mayOverride = configuration[right.name].canOverride || sameValue;
          overridable = everyValuesPair(mayOverride.bind(null, validator), left, right);
        }

        if (left.important && !right.important && overridable) {
          right.unused = true;
          continue;
        }

        if (!left.important && right.important && overridable) {
          left.unused = true;
          continue;
        }

        if (!overridable) {
          continue;
        }

        left.unused = true;
      }
    }
  }
}

var overrideProperties_1 = overrideProperties$1;

var mergeIntoShorthands = mergeIntoShorthands_1;
var overrideProperties = overrideProperties_1;
var populateComponents$1 = populateComponents_1;

var restoreWithComponents = restoreWithComponents_1;

var wrapForOptimizing$1 = wrapForOptimizing$3.all;
var removeUnused = removeUnused_1;
var restoreFromOptimizing$1 = restoreFromOptimizing_1;

var OptimizationLevel$5 = optimizationLevel.OptimizationLevel;

function optimizeProperties$4(properties, withOverriding, withMerging, context) {
  var levelOptions = context.options.level[OptimizationLevel$5.Two];
  var _properties = wrapForOptimizing$1(properties, levelOptions.skipProperties);
  var _property;
  var i, l;

  populateComponents$1(_properties, context.validator, context.warnings);

  for (i = 0, l = _properties.length; i < l; i++) {
    _property = _properties[i];
    if (_property.block) {
      optimizeProperties$4(_property.value[0][1], withOverriding, withMerging, context);
    }
  }

  if (withMerging && levelOptions.mergeIntoShorthands) {
    mergeIntoShorthands(_properties, context.validator);
  }

  if (withOverriding && levelOptions.overrideProperties) {
    overrideProperties(_properties, withMerging, context.options.compatibility, context.validator);
  }

  restoreFromOptimizing$1(_properties, restoreWithComponents);
  removeUnused(_properties);
}

var optimize$2 = optimizeProperties$4;

var isMergeable$3 = isMergeable_1;

var optimizeProperties$3 = optimize$2;

var sortSelectors$1 = sortSelectors_1;
var tidyRules$1 = tidyRules_1;

var OptimizationLevel$4 = optimizationLevel.OptimizationLevel;

var serializeBody$4 = oneTime.body;
var serializeRules$8 = oneTime.rules;

var Token$f = token;

function mergeAdjacent$1(tokens, context) {
  var lastToken = [null, [], []];
  var options = context.options;
  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
  var selectorsSortingMethod = options.level[OptimizationLevel$4.One].selectorsSortingMethod;
  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
  var mergeLimit = options.compatibility.selectors.mergeLimit;
  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;

  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];

    if (token[0] != Token$f.RULE) {
      lastToken = [null, [], []];
      continue;
    }

    if (lastToken[0] == Token$f.RULE && serializeRules$8(token[1]) == serializeRules$8(lastToken[1])) {
      Array.prototype.push.apply(lastToken[2], token[2]);
      optimizeProperties$3(lastToken[2], true, true, context);
      token[2] = [];
    } else if (lastToken[0] == Token$f.RULE && serializeBody$4(token[2]) == serializeBody$4(lastToken[2]) &&
        isMergeable$3(serializeRules$8(token[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) &&
        isMergeable$3(serializeRules$8(lastToken[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) &&
        lastToken[1].length < mergeLimit) {
      lastToken[1] = tidyRules$1(lastToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
      lastToken[1] = lastToken.length > 1 ? sortSelectors$1(lastToken[1], selectorsSortingMethod) : lastToken[1];
      token[2] = [];
    } else {
      lastToken = token;
    }
  }
}

var mergeAdjacent_1 = mergeAdjacent$1;

var MODIFIER_PATTERN = /\-\-.+$/;

function rulesOverlap$2(rule1, rule2, bemMode) {
  var scope1;
  var scope2;
  var i, l;
  var j, m;

  for (i = 0, l = rule1.length; i < l; i++) {
    scope1 = rule1[i][1];

    for (j = 0, m = rule2.length; j < m; j++) {
      scope2 = rule2[j][1];

      if (scope1 == scope2) {
        return true;
      }

      if (bemMode && withoutModifiers(scope1) == withoutModifiers(scope2)) {
        return true;
      }
    }
  }

  return false;
}

function withoutModifiers(scope) {
  return scope.replace(MODIFIER_PATTERN, '');
}

var rulesOverlap_1 = rulesOverlap$2;

var Marker$2 = marker;

var Selector = {
  ADJACENT_SIBLING: '+',
  DESCENDANT: '>',
  DOT: '.',
  HASH: '#',
  NON_ADJACENT_SIBLING: '~',
  PSEUDO: ':'
};

var LETTER_PATTERN = /[a-zA-Z]/;
var NOT_PREFIX = ':not(';
var SEPARATOR_PATTERN = /[\s,\(>~\+]/;

function specificity$1(selector) {
  var result = [0, 0, 0];
  var character;
  var isEscaped;
  var isSingleQuoted;
  var isDoubleQuoted;
  var roundBracketLevel = 0;
  var couldIntroduceNewTypeSelector;
  var withinNotPseudoClass = false;
  var wasPseudoClass = false;
  var i, l;

  for (i = 0, l = selector.length; i < l; i++) {
    character = selector[i];

    if (isEscaped) ; else if (character == Marker$2.SINGLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
      isSingleQuoted = true;
    } else if (character == Marker$2.SINGLE_QUOTE && !isDoubleQuoted && isSingleQuoted) {
      isSingleQuoted = false;
    } else if (character == Marker$2.DOUBLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
      isDoubleQuoted = true;
    } else if (character == Marker$2.DOUBLE_QUOTE && isDoubleQuoted && !isSingleQuoted) {
      isDoubleQuoted = false;
    } else if (isSingleQuoted || isDoubleQuoted) {
      continue;
    } else if (roundBracketLevel > 0 && !withinNotPseudoClass) ; else if (character == Marker$2.OPEN_ROUND_BRACKET) {
      roundBracketLevel++;
    } else if (character == Marker$2.CLOSE_ROUND_BRACKET && roundBracketLevel == 1) {
      roundBracketLevel--;
      withinNotPseudoClass = false;
    } else if (character == Marker$2.CLOSE_ROUND_BRACKET) {
      roundBracketLevel--;
    } else if (character == Selector.HASH) {
      result[0]++;
    } else if (character == Selector.DOT || character == Marker$2.OPEN_SQUARE_BRACKET) {
      result[1]++;
    } else if (character == Selector.PSEUDO && !wasPseudoClass && !isNotPseudoClass(selector, i)) {
      result[1]++;
      withinNotPseudoClass = false;
    } else if (character == Selector.PSEUDO) {
      withinNotPseudoClass = true;
    } else if ((i === 0 || couldIntroduceNewTypeSelector) && LETTER_PATTERN.test(character)) {
      result[2]++;
    }

    isEscaped = character == Marker$2.BACK_SLASH;
    wasPseudoClass = character == Selector.PSEUDO;
    couldIntroduceNewTypeSelector = !isEscaped && SEPARATOR_PATTERN.test(character);
  }

  return result;
}

function isNotPseudoClass(selector, index) {
  return selector.indexOf(NOT_PREFIX, index) === index;
}

var specificity_1 = specificity$1;

var specificity = specificity_1;

function specificitiesOverlap$1(selector1, selector2, cache) {
  var specificity1;
  var specificity2;
  var i, l;
  var j, m;

  for (i = 0, l = selector1.length; i < l; i++) {
    specificity1 = findSpecificity(selector1[i][1], cache);

    for (j = 0, m = selector2.length; j < m; j++) {
      specificity2 = findSpecificity(selector2[j][1], cache);

      if (specificity1[0] === specificity2[0] && specificity1[1] === specificity2[1] && specificity1[2] === specificity2[2]) {
        return true;
      }
    }
  }

  return false;
}

function findSpecificity(selector, cache) {
  var value;

  if (!(selector in cache)) {
    cache[selector] = value = specificity(selector);
  }

  return value || cache[selector];
}

var specificitiesOverlap_1 = specificitiesOverlap$1;

// TODO: it'd be great to merge it with the other canReorder functionality

var rulesOverlap$1 = rulesOverlap_1;
var specificitiesOverlap = specificitiesOverlap_1;

var FLEX_PROPERTIES = /align\-items|box\-align|box\-pack|flex|justify/;
var BORDER_PROPERTIES = /^border\-(top|right|bottom|left|color|style|width|radius)/;

function canReorder$2(left, right, cache) {
  for (var i = right.length - 1; i >= 0; i--) {
    for (var j = left.length - 1; j >= 0; j--) {
      if (!canReorderSingle$2(left[j], right[i], cache))
        return false;
    }
  }

  return true;
}

function canReorderSingle$2(left, right, cache) {
  var leftName = left[0];
  var leftValue = left[1];
  var leftNameRoot = left[2];
  var leftSelector = left[5];
  var leftInSpecificSelector = left[6];
  var rightName = right[0];
  var rightValue = right[1];
  var rightNameRoot = right[2];
  var rightSelector = right[5];
  var rightInSpecificSelector = right[6];

  if (leftName == 'font' && rightName == 'line-height' || rightName == 'font' && leftName == 'line-height')
    return false;
  if (FLEX_PROPERTIES.test(leftName) && FLEX_PROPERTIES.test(rightName))
    return false;
  if (leftNameRoot == rightNameRoot && unprefixed(leftName) == unprefixed(rightName) && (vendorPrefixed(leftName) ^ vendorPrefixed(rightName)))
    return false;
  if (leftNameRoot == 'border' && BORDER_PROPERTIES.test(rightNameRoot) && (leftName == 'border' || leftName == rightNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName))))
    return false;
  if (rightNameRoot == 'border' && BORDER_PROPERTIES.test(leftNameRoot) && (rightName == 'border' || rightName == leftNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName))))
    return false;
  if (leftNameRoot == 'border' && rightNameRoot == 'border' && leftName != rightName && (isSideBorder(leftName) && isStyleBorder(rightName) || isStyleBorder(leftName) && isSideBorder(rightName)))
    return false;
  if (leftNameRoot != rightNameRoot)
    return true;
  if (leftName == rightName && leftNameRoot == rightNameRoot && (leftValue == rightValue || withDifferentVendorPrefix(leftValue, rightValue)))
    return true;
  if (leftName != rightName && leftNameRoot == rightNameRoot && leftName != leftNameRoot && rightName != rightNameRoot)
    return true;
  if (leftName != rightName && leftNameRoot == rightNameRoot && leftValue == rightValue)
    return true;
  if (rightInSpecificSelector && leftInSpecificSelector && !inheritable(leftNameRoot) && !inheritable(rightNameRoot) && !rulesOverlap$1(rightSelector, leftSelector, false))
    return true;
  if (!specificitiesOverlap(leftSelector, rightSelector, cache))
    return true;

  return false;
}

function vendorPrefixed(name) {
  return /^\-(?:moz|webkit|ms|o)\-/.test(name);
}

function unprefixed(name) {
  return name.replace(/^\-(?:moz|webkit|ms|o)\-/, '');
}

function sameBorderComponent(name1, name2) {
  return name1.split('-').pop() == name2.split('-').pop();
}

function isSideBorder(name) {
  return name == 'border-top' || name == 'border-right' || name == 'border-bottom' || name == 'border-left';
}

function isStyleBorder(name) {
  return name == 'border-color' || name == 'border-style' || name == 'border-width';
}

function withDifferentVendorPrefix(value1, value2) {
  return vendorPrefixed(value1) && vendorPrefixed(value2) && value1.split('-')[1] != value2.split('-')[2];
}

function inheritable(name) {
  // According to http://www.w3.org/TR/CSS21/propidx.html
  // Others will be catched by other, preceeding rules
  return name == 'font' || name == 'line-height' || name == 'list-style';
}

var reorderable = {
  canReorder: canReorder$2,
  canReorderSingle: canReorderSingle$2
};

// This extractor is used in level 2 optimizations
// IMPORTANT: Mind Token class and this code is not related!
// Properties will be tokenized in one step, see #429

var Token$e = token;
var serializeRules$7 = oneTime.rules;
var serializeValue = oneTime.value;

function extractProperties$3(token) {
  var properties = [];
  var inSpecificSelector;
  var property;
  var name;
  var value;
  var i, l;

  if (token[0] == Token$e.RULE) {
    inSpecificSelector = !/[\.\+>~]/.test(serializeRules$7(token[1]));

    for (i = 0, l = token[2].length; i < l; i++) {
      property = token[2][i];

      if (property[0] != Token$e.PROPERTY)
        continue;

      name = property[1][1];
      if (name.length === 0)
        continue;

      value = serializeValue(property, i);

      properties.push([
        name,
        value,
        findNameRoot(name),
        token[2][i],
        name + ':' + value,
        token[1],
        inSpecificSelector
      ]);
    }
  } else if (token[0] == Token$e.NESTED_BLOCK) {
    for (i = 0, l = token[2].length; i < l; i++) {
      properties = properties.concat(extractProperties$3(token[2][i]));
    }
  }

  return properties;
}

function findNameRoot(name) {
  if (name == 'list-style')
    return name;
  if (name.indexOf('-radius') > 0)
    return 'border-radius';
  if (name == 'border-collapse' || name == 'border-spacing' || name == 'border-image')
    return name;
  if (name.indexOf('border-') === 0 && /^border\-\w+\-\w+$/.test(name))
    return name.match(/border\-\w+/)[0];
  if (name.indexOf('border-') === 0 && /^border\-\w+$/.test(name))
    return 'border';
  if (name.indexOf('text-') === 0)
    return name;
  if (name == '-chrome-')
    return name;

  return name.replace(/^\-\w+\-/, '').match(/([a-zA-Z]+)/)[0].toLowerCase();
}

var extractProperties_1 = extractProperties$3;

var canReorder$1 = reorderable.canReorder;
var canReorderSingle$1 = reorderable.canReorderSingle;
var extractProperties$2 = extractProperties_1;
var rulesOverlap = rulesOverlap_1;

var serializeRules$6 = oneTime.rules;
var OptimizationLevel$3 = optimizationLevel.OptimizationLevel;
var Token$d = token;

function mergeMediaQueries$1(tokens, context) {
  var mergeSemantically = context.options.level[OptimizationLevel$3.Two].mergeSemantically;
  var specificityCache = context.cache.specificity;
  var candidates = {};
  var reduced = [];

  for (var i = tokens.length - 1; i >= 0; i--) {
    var token = tokens[i];
    if (token[0] != Token$d.NESTED_BLOCK) {
      continue;
    }

    var key = serializeRules$6(token[1]);
    var candidate = candidates[key];
    if (!candidate) {
      candidate = [];
      candidates[key] = candidate;
    }

    candidate.push(i);
  }

  for (var name in candidates) {
    var positions = candidates[name];

    positionLoop:
    for (var j = positions.length - 1; j > 0; j--) {
      var positionOne = positions[j];
      var tokenOne = tokens[positionOne];
      var positionTwo = positions[j - 1];
      var tokenTwo = tokens[positionTwo];

      directionLoop:
      for (var direction = 1; direction >= -1; direction -= 2) {
        var topToBottom = direction == 1;
        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
        var to = topToBottom ? positionTwo : positionOne;
        var delta = topToBottom ? 1 : -1;
        var source = topToBottom ? tokenOne : tokenTwo;
        var target = topToBottom ? tokenTwo : tokenOne;
        var movedProperties = extractProperties$2(source);

        while (from != to) {
          var traversedProperties = extractProperties$2(tokens[from]);
          from += delta;

          if (mergeSemantically && allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache)) {
            continue;
          }

          if (!canReorder$1(movedProperties, traversedProperties, specificityCache))
            continue directionLoop;
        }

        target[2] = topToBottom ?
          source[2].concat(target[2]) :
          target[2].concat(source[2]);
        source[2] = [];

        reduced.push(target);
        continue positionLoop;
      }
    }
  }

  return reduced;
}

function allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache) {
  var movedProperty;
  var movedRule;
  var traversedProperty;
  var traversedRule;
  var i, l;
  var j, m;

  for (i = 0, l = movedProperties.length; i < l; i++) {
    movedProperty = movedProperties[i];
    movedRule = movedProperty[5];

    for (j = 0, m = traversedProperties.length; j < m; j++) {
      traversedProperty = traversedProperties[j];
      traversedRule = traversedProperty[5];

      if (rulesOverlap(movedRule, traversedRule, true) && !canReorderSingle$1(movedProperty, traversedProperty, specificityCache)) {
        return false;
      }
    }
  }

  return true;
}

var mergeMediaQueries_1 = mergeMediaQueries$1;

var isMergeable$2 = isMergeable_1;

var sortSelectors = sortSelectors_1;
var tidyRules = tidyRules_1;

var OptimizationLevel$2 = optimizationLevel.OptimizationLevel;

var serializeBody$3 = oneTime.body;
var serializeRules$5 = oneTime.rules;

var Token$c = token;

function unsafeSelector(value) {
  return /\.|\*| :/.test(value);
}

function isBemElement(token) {
  var asString = serializeRules$5(token[1]);
  return asString.indexOf('__') > -1 || asString.indexOf('--') > -1;
}

function withoutModifier(selector) {
  return selector.replace(/--[^ ,>\+~:]+/g, '');
}

function removeAnyUnsafeElements(left, candidates) {
  var leftSelector = withoutModifier(serializeRules$5(left[1]));

  for (var body in candidates) {
    var right = candidates[body];
    var rightSelector = withoutModifier(serializeRules$5(right[1]));

    if (rightSelector.indexOf(leftSelector) > -1 || leftSelector.indexOf(rightSelector) > -1)
      delete candidates[body];
  }
}

function mergeNonAdjacentByBody$1(tokens, context) {
  var options = context.options;
  var mergeSemantically = options.level[OptimizationLevel$2.Two].mergeSemantically;
  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
  var selectorsSortingMethod = options.level[OptimizationLevel$2.One].selectorsSortingMethod;
  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
  var candidates = {};

  for (var i = tokens.length - 1; i >= 0; i--) {
    var token = tokens[i];
    if (token[0] != Token$c.RULE)
      continue;

    if (token[2].length > 0 && (!mergeSemantically && unsafeSelector(serializeRules$5(token[1]))))
      candidates = {};

    if (token[2].length > 0 && mergeSemantically && isBemElement(token))
      removeAnyUnsafeElements(token, candidates);

    var candidateBody = serializeBody$3(token[2]);
    var oldToken = candidates[candidateBody];
    if (oldToken &&
        isMergeable$2(serializeRules$5(token[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) &&
        isMergeable$2(serializeRules$5(oldToken[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)) {

      if (token[2].length > 0) {
        token[1] = tidyRules(oldToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
        token[1] = token[1].length > 1 ? sortSelectors(token[1], selectorsSortingMethod) : token[1];
      } else {
        token[1] = oldToken[1].concat(token[1]);
      }

      oldToken[2] = [];
      candidates[candidateBody] = null;
    }

    candidates[serializeBody$3(token[2])] = token;
  }
}

var mergeNonAdjacentByBody_1 = mergeNonAdjacentByBody$1;

var canReorder = reorderable.canReorder;
var extractProperties$1 = extractProperties_1;

var optimizeProperties$2 = optimize$2;

var serializeRules$4 = oneTime.rules;

var Token$b = token;

function mergeNonAdjacentBySelector$1(tokens, context) {
  var specificityCache = context.cache.specificity;
  var allSelectors = {};
  var repeatedSelectors = [];
  var i;

  for (i = tokens.length - 1; i >= 0; i--) {
    if (tokens[i][0] != Token$b.RULE)
      continue;
    if (tokens[i][2].length === 0)
      continue;

    var selector = serializeRules$4(tokens[i][1]);
    allSelectors[selector] = [i].concat(allSelectors[selector] || []);

    if (allSelectors[selector].length == 2)
      repeatedSelectors.push(selector);
  }

  for (i = repeatedSelectors.length - 1; i >= 0; i--) {
    var positions = allSelectors[repeatedSelectors[i]];

    selectorIterator:
    for (var j = positions.length - 1; j > 0; j--) {
      var positionOne = positions[j - 1];
      var tokenOne = tokens[positionOne];
      var positionTwo = positions[j];
      var tokenTwo = tokens[positionTwo];

      directionIterator:
      for (var direction = 1; direction >= -1; direction -= 2) {
        var topToBottom = direction == 1;
        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
        var to = topToBottom ? positionTwo : positionOne;
        var delta = topToBottom ? 1 : -1;
        var moved = topToBottom ? tokenOne : tokenTwo;
        var target = topToBottom ? tokenTwo : tokenOne;
        var movedProperties = extractProperties$1(moved);

        while (from != to) {
          var traversedProperties = extractProperties$1(tokens[from]);
          from += delta;

          // traversed then moved as we move selectors towards the start
          var reorderable = topToBottom ?
            canReorder(movedProperties, traversedProperties, specificityCache) :
            canReorder(traversedProperties, movedProperties, specificityCache);

          if (!reorderable && !topToBottom)
            continue selectorIterator;
          if (!reorderable && topToBottom)
            continue directionIterator;
        }

        if (topToBottom) {
          Array.prototype.push.apply(moved[2], target[2]);
          target[2] = moved[2];
        } else {
          Array.prototype.push.apply(target[2], moved[2]);
        }

        optimizeProperties$2(target[2], true, true, context);
        moved[2] = [];
      }
    }
  }
}

var mergeNonAdjacentBySelector_1 = mergeNonAdjacentBySelector$1;

function cloneArray$2(array) {
  var cloned = array.slice(0);

  for (var i = 0, l = cloned.length; i < l; i++) {
    if (Array.isArray(cloned[i]))
      cloned[i] = cloneArray$2(cloned[i]);
  }

  return cloned;
}

var cloneArray_1 = cloneArray$2;

var isMergeable$1 = isMergeable_1;

var optimizeProperties$1 = optimize$2;

var cloneArray$1 = cloneArray_1;

var Token$a = token;

var serializeBody$2 = oneTime.body;
var serializeRules$3 = oneTime.rules;

function reduceNonAdjacent$1(tokens, context) {
  var options = context.options;
  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
  var candidates = {};
  var repeated = [];

  for (var i = tokens.length - 1; i >= 0; i--) {
    var token = tokens[i];

    if (token[0] != Token$a.RULE) {
      continue;
    } else if (token[2].length === 0) {
      continue;
    }

    var selectorAsString = serializeRules$3(token[1]);
    var isComplexAndNotSpecial = token[1].length > 1 &&
      isMergeable$1(selectorAsString, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging);
    var wrappedSelectors = wrappedSelectorsFrom(token[1]);
    var selectors = isComplexAndNotSpecial ?
      [selectorAsString].concat(wrappedSelectors) :
      [selectorAsString];

    for (var j = 0, m = selectors.length; j < m; j++) {
      var selector = selectors[j];

      if (!candidates[selector])
        candidates[selector] = [];
      else
        repeated.push(selector);

      candidates[selector].push({
        where: i,
        list: wrappedSelectors,
        isPartial: isComplexAndNotSpecial && j > 0,
        isComplex: isComplexAndNotSpecial && j === 0
      });
    }
  }

  reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context);
  reduceComplexNonAdjacentCases(tokens, candidates, options, context);
}

function wrappedSelectorsFrom(list) {
  var wrapped = [];

  for (var i = 0; i < list.length; i++) {
    wrapped.push([list[i][1]]);
  }

  return wrapped;
}

function reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context) {
  function filterOut(idx, bodies) {
    return data[idx].isPartial && bodies.length === 0;
  }

  function reduceBody(token, newBody, processedCount, tokenIdx) {
    if (!data[processedCount - tokenIdx - 1].isPartial)
      token[2] = newBody;
  }

  for (var i = 0, l = repeated.length; i < l; i++) {
    var selector = repeated[i];
    var data = candidates[selector];

    reduceSelector(tokens, data, {
      filterOut: filterOut,
      callback: reduceBody
    }, options, context);
  }
}

function reduceComplexNonAdjacentCases(tokens, candidates, options, context) {
  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
  var localContext = {};

  function filterOut(idx) {
    return localContext.data[idx].where < localContext.intoPosition;
  }

  function collectReducedBodies(token, newBody, processedCount, tokenIdx) {
    if (tokenIdx === 0)
      localContext.reducedBodies.push(newBody);
  }

  allSelectors:
  for (var complexSelector in candidates) {
    var into = candidates[complexSelector];
    if (!into[0].isComplex)
      continue;

    var intoPosition = into[into.length - 1].where;
    var intoToken = tokens[intoPosition];
    var reducedBodies = [];

    var selectors = isMergeable$1(complexSelector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) ?
      into[0].list :
      [complexSelector];

    localContext.intoPosition = intoPosition;
    localContext.reducedBodies = reducedBodies;

    for (var j = 0, m = selectors.length; j < m; j++) {
      var selector = selectors[j];
      var data = candidates[selector];

      if (data.length < 2)
        continue allSelectors;

      localContext.data = data;

      reduceSelector(tokens, data, {
        filterOut: filterOut,
        callback: collectReducedBodies
      }, options, context);

      if (serializeBody$2(reducedBodies[reducedBodies.length - 1]) != serializeBody$2(reducedBodies[0]))
        continue allSelectors;
    }

    intoToken[2] = reducedBodies[0];
  }
}

function reduceSelector(tokens, data, context, options, outerContext) {
  var bodies = [];
  var bodiesAsList = [];
  var processedTokens = [];

  for (var j = data.length - 1; j >= 0; j--) {
    if (context.filterOut(j, bodies))
      continue;

    var where = data[j].where;
    var token = tokens[where];
    var clonedBody = cloneArray$1(token[2]);

    bodies = bodies.concat(clonedBody);
    bodiesAsList.push(clonedBody);
    processedTokens.push(where);
  }

  optimizeProperties$1(bodies, true, false, outerContext);

  var processedCount = processedTokens.length;
  var propertyIdx = bodies.length - 1;
  var tokenIdx = processedCount - 1;

  while (tokenIdx >= 0) {
     if ((tokenIdx === 0 || (bodies[propertyIdx] && bodiesAsList[tokenIdx].indexOf(bodies[propertyIdx]) > -1)) && propertyIdx > -1) {
      propertyIdx--;
      continue;
    }

    var newBody = bodies.splice(propertyIdx + 1);
    context.callback(tokens[processedTokens[tokenIdx]], newBody, processedCount, tokenIdx);

    tokenIdx--;
  }
}

var reduceNonAdjacent_1 = reduceNonAdjacent$1;

var Token$9 = token;

var serializeAll$1 = oneTime.all;

var FONT_FACE_SCOPE = '@font-face';

function removeDuplicateFontAtRules$1(tokens) {
  var fontAtRules = [];
  var token;
  var key;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];

    if (token[0] != Token$9.AT_RULE_BLOCK && token[1][0][1] != FONT_FACE_SCOPE) {
      continue;
    }

    key = serializeAll$1([token]);

    if (fontAtRules.indexOf(key) > -1) {
      token[2] = [];
    } else {
      fontAtRules.push(key);
    }
  }
}

var removeDuplicateFontAtRules_1 = removeDuplicateFontAtRules$1;

var Token$8 = token;

var serializeAll = oneTime.all;
var serializeRules$2 = oneTime.rules;

function removeDuplicateMediaQueries$1(tokens) {
  var candidates = {};
  var candidate;
  var token;
  var key;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];
    if (token[0] != Token$8.NESTED_BLOCK) {
      continue;
    }

    key = serializeRules$2(token[1]) + '%' + serializeAll(token[2]);
    candidate = candidates[key];

    if (candidate) {
      candidate[2] = [];
    }

    candidates[key] = token;
  }
}

var removeDuplicateMediaQueries_1 = removeDuplicateMediaQueries$1;

var Token$7 = token;

var serializeBody$1 = oneTime.body;
var serializeRules$1 = oneTime.rules;

function removeDuplicates$1(tokens) {
  var matched = {};
  var moreThanOnce = [];
  var id, token;
  var body, bodies;

  for (var i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];
    if (token[0] != Token$7.RULE)
      continue;

    id = serializeRules$1(token[1]);

    if (matched[id] && matched[id].length == 1)
      moreThanOnce.push(id);
    else
      matched[id] = matched[id] || [];

    matched[id].push(i);
  }

  for (i = 0, l = moreThanOnce.length; i < l; i++) {
    id = moreThanOnce[i];
    bodies = [];

    for (var j = matched[id].length - 1; j >= 0; j--) {
      token = tokens[matched[id][j]];
      body = serializeBody$1(token[2]);

      if (bodies.indexOf(body) > -1)
        token[2] = [];
      else
        bodies.push(body);
    }
  }
}

var removeDuplicates_1 = removeDuplicates$1;

var populateComponents = populateComponents_1;

var wrapForOptimizing = wrapForOptimizing$3.single;
var restoreFromOptimizing = restoreFromOptimizing_1;

var Token$6 = token;

var animationNameRegex = /^(\-moz\-|\-o\-|\-webkit\-)?animation-name$/;
var animationRegex = /^(\-moz\-|\-o\-|\-webkit\-)?animation$/;
var keyframeRegex = /^@(\-moz\-|\-o\-|\-webkit\-)?keyframes /;
var importantRegex = /\s{0,31}!important$/;
var optionalMatchingQuotesRegex = /^(['"]?)(.*)\1$/;

function normalize$2(value) {
  return value
    .replace(optionalMatchingQuotesRegex, '$2')
    .replace(importantRegex, '');
}

function removeUnusedAtRules$1(tokens, context) {
  removeUnusedAtRule(tokens, matchCounterStyle, markCounterStylesAsUsed, context);
  removeUnusedAtRule(tokens, matchFontFace, markFontFacesAsUsed, context);
  removeUnusedAtRule(tokens, matchKeyframe, markKeyframesAsUsed, context);
  removeUnusedAtRule(tokens, matchNamespace, markNamespacesAsUsed, context);
}

function removeUnusedAtRule(tokens, matchCallback, markCallback, context) {
  var atRules = {};
  var atRule;
  var atRuleTokens;
  var atRuleToken;
  var zeroAt;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    matchCallback(tokens[i], atRules);
  }

  if (Object.keys(atRules).length === 0) {
    return;
  }

  markUsedAtRules(tokens, markCallback, atRules, context);

  for (atRule in atRules) {
    atRuleTokens = atRules[atRule];

    for (i = 0, l = atRuleTokens.length; i < l; i++) {
      atRuleToken = atRuleTokens[i];
      zeroAt = atRuleToken[0] == Token$6.AT_RULE ? 1 : 2;
      atRuleToken[zeroAt] = [];
    }
  }
}

function markUsedAtRules(tokens, markCallback, atRules, context) {
  var boundMarkCallback = markCallback(atRules);
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    switch (tokens[i][0]) {
      case Token$6.RULE:
        boundMarkCallback(tokens[i], context);
        break;
      case Token$6.NESTED_BLOCK:
        markUsedAtRules(tokens[i][2], markCallback, atRules, context);
    }
  }
}

function matchCounterStyle(token, atRules) {
  var match;

  if (token[0] == Token$6.AT_RULE_BLOCK && token[1][0][1].indexOf('@counter-style') === 0) {
    match = token[1][0][1].split(' ')[1];
    atRules[match] = atRules[match] || [];
    atRules[match].push(token);
  }
}

function markCounterStylesAsUsed(atRules) {
  return function (token, context) {
    var property;
    var wrappedProperty;
    var i, l;

    for (i = 0, l = token[2].length; i < l; i++) {
      property = token[2][i];

      if (property[1][1] == 'list-style') {
        wrappedProperty = wrapForOptimizing(property);
        populateComponents([wrappedProperty], context.validator, context.warnings);

        if (wrappedProperty.components[0].value[0][1] in atRules) {
          delete atRules[property[2][1]];
        }

        restoreFromOptimizing([wrappedProperty]);
      }

      if (property[1][1] == 'list-style-type' && property[2][1] in atRules) {
        delete atRules[property[2][1]];
      }
    }
  };
}

function matchFontFace(token, atRules) {
  var property;
  var match;
  var i, l;

  if (token[0] == Token$6.AT_RULE_BLOCK && token[1][0][1] == '@font-face') {
    for (i = 0, l = token[2].length; i < l; i++) {
      property = token[2][i];

      if (property[1][1] == 'font-family') {
        match = normalize$2(property[2][1].toLowerCase());
        atRules[match] = atRules[match] || [];
        atRules[match].push(token);
        break;
      }
    }
  }
}

function markFontFacesAsUsed(atRules) {
  return function (token, context) {
    var property;
    var wrappedProperty;
    var component;
    var normalizedMatch;
    var i, l;
    var j, m;

    for (i = 0, l = token[2].length; i < l; i++) {
      property = token[2][i];

      if (property[1][1] == 'font') {
        wrappedProperty = wrapForOptimizing(property);
        populateComponents([wrappedProperty], context.validator, context.warnings);
        component = wrappedProperty.components[6];

        for (j = 0, m = component.value.length; j < m; j++) {
          normalizedMatch = normalize$2(component.value[j][1].toLowerCase());

          if (normalizedMatch in atRules) {
            delete atRules[normalizedMatch];
          }
        }

        restoreFromOptimizing([wrappedProperty]);
      }

      if (property[1][1] == 'font-family') {
        for (j = 2, m = property.length; j < m; j++) {
          normalizedMatch = normalize$2(property[j][1].toLowerCase());

          if (normalizedMatch in atRules) {
            delete atRules[normalizedMatch];
          }
        }
      }
    }
  };
}

function matchKeyframe(token, atRules) {
  var match;

  if (token[0] == Token$6.NESTED_BLOCK && keyframeRegex.test(token[1][0][1])) {
    match = token[1][0][1].split(' ')[1];
    atRules[match] = atRules[match] || [];
    atRules[match].push(token);
  }
}

function markKeyframesAsUsed(atRules) {
  return function (token, context) {
    var property;
    var wrappedProperty;
    var component;
    var i, l;
    var j, m;

    for (i = 0, l = token[2].length; i < l; i++) {
      property = token[2][i];

      if (animationRegex.test(property[1][1])) {
        wrappedProperty = wrapForOptimizing(property);
        populateComponents([wrappedProperty], context.validator, context.warnings);
        component = wrappedProperty.components[7];

        for (j = 0, m = component.value.length; j < m; j++) {
          if (component.value[j][1] in atRules) {
            delete atRules[component.value[j][1]];
          }
        }

        restoreFromOptimizing([wrappedProperty]);
      }

      if (animationNameRegex.test(property[1][1])) {
        for (j = 2, m = property.length; j < m; j++) {
          if (property[j][1] in atRules) {
            delete atRules[property[j][1]];
          }
        }
      }
    }
  };
}

function matchNamespace(token, atRules) {
  var match;

  if (token[0] == Token$6.AT_RULE && token[1].indexOf('@namespace') === 0) {
    match = token[1].split(' ')[1];
    atRules[match] = atRules[match] || [];
    atRules[match].push(token);
  }
}

function markNamespacesAsUsed(atRules) {
  var namespaceRegex = new RegExp(Object.keys(atRules).join('\\\||') + '\\\|', 'g');

  return function (token) {
    var match;
    var scope;
    var normalizedMatch;
    var i, l;
    var j, m;

    for (i = 0, l = token[1].length; i < l; i++) {
      scope = token[1][i];
      match = scope[1].match(namespaceRegex);

      for (j = 0, m = match.length; j < m; j++) {
        normalizedMatch = match[j].substring(0, match[j].length - 1);

        if (normalizedMatch in atRules) {
          delete atRules[normalizedMatch];
        }
      }
    }
  };
}

var removeUnusedAtRules_1 = removeUnusedAtRules$1;

function ruleSorter(s1, s2) {
  return s1[1] > s2[1] ? 1 : -1;
}

function tidyRuleDuplicates$1(rules) {
  var list = [];
  var repeated = [];

  for (var i = 0, l = rules.length; i < l; i++) {
    var rule = rules[i];

    if (repeated.indexOf(rule[1]) == -1) {
      repeated.push(rule[1]);
      list.push(rule);
    }
  }

  return list.sort(ruleSorter);
}

var tidyRuleDuplicates_1 = tidyRuleDuplicates$1;

var canReorderSingle = reorderable.canReorderSingle;
var extractProperties = extractProperties_1;
var isMergeable = isMergeable_1;
var tidyRuleDuplicates = tidyRuleDuplicates_1;

var Token$5 = token;

var cloneArray = cloneArray_1;

var serializeBody = oneTime.body;
var serializeRules = oneTime.rules;

function naturalSorter(a, b) {
  return a > b ? 1 : -1;
}

function cloneAndMergeSelectors(propertyA, propertyB) {
  var cloned = cloneArray(propertyA);
  cloned[5] = cloned[5].concat(propertyB[5]);

  return cloned;
}

function restructure$1(tokens, context) {
  var options = context.options;
  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
  var mergeLimit = options.compatibility.selectors.mergeLimit;
  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
  var specificityCache = context.cache.specificity;
  var movableTokens = {};
  var movedProperties = [];
  var multiPropertyMoveCache = {};
  var movedToBeDropped = [];
  var maxCombinationsLevel = 2;
  var ID_JOIN_CHARACTER = '%';

  function sendToMultiPropertyMoveCache(position, movedProperty, allFits) {
    for (var i = allFits.length - 1; i >= 0; i--) {
      var fit = allFits[i][0];
      var id = addToCache(movedProperty, fit);

      if (multiPropertyMoveCache[id].length > 1 && processMultiPropertyMove(position, multiPropertyMoveCache[id])) {
        removeAllMatchingFromCache(id);
        break;
      }
    }
  }

  function addToCache(movedProperty, fit) {
    var id = cacheId(fit);
    multiPropertyMoveCache[id] = multiPropertyMoveCache[id] || [];
    multiPropertyMoveCache[id].push([movedProperty, fit]);
    return id;
  }

  function removeAllMatchingFromCache(matchId) {
    var matchSelectors = matchId.split(ID_JOIN_CHARACTER);
    var forRemoval = [];
    var i;

    for (var id in multiPropertyMoveCache) {
      var selectors = id.split(ID_JOIN_CHARACTER);
      for (i = selectors.length - 1; i >= 0; i--) {
        if (matchSelectors.indexOf(selectors[i]) > -1) {
          forRemoval.push(id);
          break;
        }
      }
    }

    for (i = forRemoval.length - 1; i >= 0; i--) {
      delete multiPropertyMoveCache[forRemoval[i]];
    }
  }

  function cacheId(cachedTokens) {
    var id = [];
    for (var i = 0, l = cachedTokens.length; i < l; i++) {
      id.push(serializeRules(cachedTokens[i][1]));
    }
    return id.join(ID_JOIN_CHARACTER);
  }

  function tokensToMerge(sourceTokens) {
    var uniqueTokensWithBody = [];
    var mergeableTokens = [];

    for (var i = sourceTokens.length - 1; i >= 0; i--) {
      if (!isMergeable(serializeRules(sourceTokens[i][1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)) {
        continue;
      }

      mergeableTokens.unshift(sourceTokens[i]);
      if (sourceTokens[i][2].length > 0 && uniqueTokensWithBody.indexOf(sourceTokens[i]) == -1)
        uniqueTokensWithBody.push(sourceTokens[i]);
    }

    return uniqueTokensWithBody.length > 1 ?
      mergeableTokens :
      [];
  }

  function shortenIfPossible(position, movedProperty) {
    var name = movedProperty[0];
    var value = movedProperty[1];
    var key = movedProperty[4];
    var valueSize = name.length + value.length + 1;
    var allSelectors = [];
    var qualifiedTokens = [];

    var mergeableTokens = tokensToMerge(movableTokens[key]);
    if (mergeableTokens.length < 2)
      return;

    var allFits = findAllFits(mergeableTokens, valueSize, 1);
    var bestFit = allFits[0];
    if (bestFit[1] > 0)
      return sendToMultiPropertyMoveCache(position, movedProperty, allFits);

    for (var i = bestFit[0].length - 1; i >=0; i--) {
      allSelectors = bestFit[0][i][1].concat(allSelectors);
      qualifiedTokens.unshift(bestFit[0][i]);
    }

    allSelectors = tidyRuleDuplicates(allSelectors);
    dropAsNewTokenAt(position, [movedProperty], allSelectors, qualifiedTokens);
  }

  function fitSorter(fit1, fit2) {
    return fit1[1] > fit2[1] ? 1 : (fit1[1] == fit2[1] ? 0 : -1);
  }

  function findAllFits(mergeableTokens, propertySize, propertiesCount) {
    var combinations = allCombinations(mergeableTokens, propertySize, propertiesCount, maxCombinationsLevel - 1);
    return combinations.sort(fitSorter);
  }

  function allCombinations(tokensVariant, propertySize, propertiesCount, level) {
    var differenceVariants = [[tokensVariant, sizeDifference(tokensVariant, propertySize, propertiesCount)]];
    if (tokensVariant.length > 2 && level > 0) {
      for (var i = tokensVariant.length - 1; i >= 0; i--) {
        var subVariant = Array.prototype.slice.call(tokensVariant, 0);
        subVariant.splice(i, 1);
        differenceVariants = differenceVariants.concat(allCombinations(subVariant, propertySize, propertiesCount, level - 1));
      }
    }

    return differenceVariants;
  }

  function sizeDifference(tokensVariant, propertySize, propertiesCount) {
    var allSelectorsSize = 0;
    for (var i = tokensVariant.length - 1; i >= 0; i--) {
      allSelectorsSize += tokensVariant[i][2].length > propertiesCount ? serializeRules(tokensVariant[i][1]).length : -1;
    }
    return allSelectorsSize - (tokensVariant.length - 1) * propertySize + 1;
  }

  function dropAsNewTokenAt(position, properties, allSelectors, mergeableTokens) {
    var i, j, k, m;
    var allProperties = [];

    for (i = mergeableTokens.length - 1; i >= 0; i--) {
      var mergeableToken = mergeableTokens[i];

      for (j = mergeableToken[2].length - 1; j >= 0; j--) {
        var mergeableProperty = mergeableToken[2][j];

        for (k = 0, m = properties.length; k < m; k++) {
          var property = properties[k];

          var mergeablePropertyName = mergeableProperty[1][1];
          var propertyName = property[0];
          var propertyBody = property[4];
          if (mergeablePropertyName == propertyName && serializeBody([mergeableProperty]) == propertyBody) {
            mergeableToken[2].splice(j, 1);
            break;
          }
        }
      }
    }

    for (i = properties.length - 1; i >= 0; i--) {
      allProperties.unshift(properties[i][3]);
    }

    var newToken = [Token$5.RULE, allSelectors, allProperties];
    tokens.splice(position, 0, newToken);
  }

  function dropPropertiesAt(position, movedProperty) {
    var key = movedProperty[4];
    var toMove = movableTokens[key];

    if (toMove && toMove.length > 1) {
      if (!shortenMultiMovesIfPossible(position, movedProperty))
        shortenIfPossible(position, movedProperty);
    }
  }

  function shortenMultiMovesIfPossible(position, movedProperty) {
    var candidates = [];
    var propertiesAndMergableTokens = [];
    var key = movedProperty[4];
    var j, k;

    var mergeableTokens = tokensToMerge(movableTokens[key]);
    if (mergeableTokens.length < 2)
      return;

    movableLoop:
    for (var value in movableTokens) {
      var tokensList = movableTokens[value];

      for (j = mergeableTokens.length - 1; j >= 0; j--) {
        if (tokensList.indexOf(mergeableTokens[j]) == -1)
          continue movableLoop;
      }

      candidates.push(value);
    }

    if (candidates.length < 2)
      return false;

    for (j = candidates.length - 1; j >= 0; j--) {
      for (k = movedProperties.length - 1; k >= 0; k--) {
        if (movedProperties[k][4] == candidates[j]) {
          propertiesAndMergableTokens.unshift([movedProperties[k], mergeableTokens]);
          break;
        }
      }
    }

    return processMultiPropertyMove(position, propertiesAndMergableTokens);
  }

  function processMultiPropertyMove(position, propertiesAndMergableTokens) {
    var valueSize = 0;
    var properties = [];
    var property;

    for (var i = propertiesAndMergableTokens.length - 1; i >= 0; i--) {
      property = propertiesAndMergableTokens[i][0];
      var fullValue = property[4];
      valueSize += fullValue.length + (i > 0 ? 1 : 0);

      properties.push(property);
    }

    var mergeableTokens = propertiesAndMergableTokens[0][1];
    var bestFit = findAllFits(mergeableTokens, valueSize, properties.length)[0];
    if (bestFit[1] > 0)
      return false;

    var allSelectors = [];
    var qualifiedTokens = [];
    for (i = bestFit[0].length - 1; i >= 0; i--) {
      allSelectors = bestFit[0][i][1].concat(allSelectors);
      qualifiedTokens.unshift(bestFit[0][i]);
    }

    allSelectors = tidyRuleDuplicates(allSelectors);
    dropAsNewTokenAt(position, properties, allSelectors, qualifiedTokens);

    for (i = properties.length - 1; i >= 0; i--) {
      property = properties[i];
      var index = movedProperties.indexOf(property);

      delete movableTokens[property[4]];

      if (index > -1 && movedToBeDropped.indexOf(index) == -1)
        movedToBeDropped.push(index);
    }

    return true;
  }

  function boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) {
    var propertyName = property[0];
    var movedPropertyName = movedProperty[0];
    if (propertyName != movedPropertyName)
      return false;

    var key = movedProperty[4];
    var toMove = movableTokens[key];
    return toMove && toMove.indexOf(token) > -1;
  }

  for (var i = tokens.length - 1; i >= 0; i--) {
    var token = tokens[i];
    var isRule;
    var j, k, m;
    var samePropertyAt;

    if (token[0] == Token$5.RULE) {
      isRule = true;
    } else if (token[0] == Token$5.NESTED_BLOCK) {
      isRule = false;
    } else {
      continue;
    }

    // We cache movedProperties.length as it may change in the loop
    var movedCount = movedProperties.length;

    var properties = extractProperties(token);
    movedToBeDropped = [];

    var unmovableInCurrentToken = [];
    for (j = properties.length - 1; j >= 0; j--) {
      for (k = j - 1; k >= 0; k--) {
        if (!canReorderSingle(properties[j], properties[k], specificityCache)) {
          unmovableInCurrentToken.push(j);
          break;
        }
      }
    }

    for (j = properties.length - 1; j >= 0; j--) {
      var property = properties[j];
      var movedSameProperty = false;

      for (k = 0; k < movedCount; k++) {
        var movedProperty = movedProperties[k];

        if (movedToBeDropped.indexOf(k) == -1 && (!canReorderSingle(property, movedProperty, specificityCache) && !boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) ||
            movableTokens[movedProperty[4]] && movableTokens[movedProperty[4]].length === mergeLimit)) {
          dropPropertiesAt(i + 1, movedProperty);

          if (movedToBeDropped.indexOf(k) == -1) {
            movedToBeDropped.push(k);
            delete movableTokens[movedProperty[4]];
          }
        }

        if (!movedSameProperty) {
          movedSameProperty = property[0] == movedProperty[0] && property[1] == movedProperty[1];

          if (movedSameProperty) {
            samePropertyAt = k;
          }
        }
      }

      if (!isRule || unmovableInCurrentToken.indexOf(j) > -1)
        continue;

      var key = property[4];

      if (movedSameProperty && movedProperties[samePropertyAt][5].length + property[5].length > mergeLimit) {
        dropPropertiesAt(i + 1, movedProperties[samePropertyAt]);
        movedProperties.splice(samePropertyAt, 1);
        movableTokens[key] = [token];
        movedSameProperty = false;
      } else {
        movableTokens[key] = movableTokens[key] || [];
        movableTokens[key].push(token);
      }

      if (movedSameProperty) {
        movedProperties[samePropertyAt] = cloneAndMergeSelectors(movedProperties[samePropertyAt], property);
      } else {
        movedProperties.push(property);
      }
    }

    movedToBeDropped = movedToBeDropped.sort(naturalSorter);
    for (j = 0, m = movedToBeDropped.length; j < m; j++) {
      var dropAt = movedToBeDropped[j] - j;
      movedProperties.splice(dropAt, 1);
    }
  }

  var position = tokens[0] && tokens[0][0] == Token$5.AT_RULE && tokens[0][1].indexOf('@charset') === 0 ? 1 : 0;
  for (; position < tokens.length - 1; position++) {
    var isImportRule = tokens[position][0] === Token$5.AT_RULE && tokens[position][1].indexOf('@import') === 0;
    var isComment = tokens[position][0] === Token$5.COMMENT;
    if (!(isImportRule || isComment))
      break;
  }

  for (i = 0; i < movedProperties.length; i++) {
    dropPropertiesAt(position, movedProperties[i]);
  }
}

var restructure_1 = restructure$1;

var mergeAdjacent = mergeAdjacent_1;
var mergeMediaQueries = mergeMediaQueries_1;
var mergeNonAdjacentByBody = mergeNonAdjacentByBody_1;
var mergeNonAdjacentBySelector = mergeNonAdjacentBySelector_1;
var reduceNonAdjacent = reduceNonAdjacent_1;
var removeDuplicateFontAtRules = removeDuplicateFontAtRules_1;
var removeDuplicateMediaQueries = removeDuplicateMediaQueries_1;
var removeDuplicates = removeDuplicates_1;
var removeUnusedAtRules = removeUnusedAtRules_1;
var restructure = restructure_1;

var optimizeProperties = optimize$2;

var OptimizationLevel$1 = optimizationLevel.OptimizationLevel;

var Token$4 = token;

function removeEmpty(tokens) {
  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];
    var isEmpty = false;

    switch (token[0]) {
      case Token$4.RULE:
        isEmpty = token[1].length === 0 || token[2].length === 0;
        break;
      case Token$4.NESTED_BLOCK:
        removeEmpty(token[2]);
        isEmpty = token[2].length === 0;
        break;
      case Token$4.AT_RULE:
        isEmpty = token[1].length === 0;
        break;
      case Token$4.AT_RULE_BLOCK:
        isEmpty = token[2].length === 0;
    }

    if (isEmpty) {
      tokens.splice(i, 1);
      i--;
      l--;
    }
  }
}

function recursivelyOptimizeBlocks(tokens, context) {
  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];

    if (token[0] == Token$4.NESTED_BLOCK) {
      var isKeyframes = /@(-moz-|-o-|-webkit-)?keyframes/.test(token[1][0][1]);
      level2Optimize$1(token[2], context, !isKeyframes);
    }
  }
}

function recursivelyOptimizeProperties(tokens, context) {
  for (var i = 0, l = tokens.length; i < l; i++) {
    var token = tokens[i];

    switch (token[0]) {
      case Token$4.RULE:
        optimizeProperties(token[2], true, true, context);
        break;
      case Token$4.NESTED_BLOCK:
        recursivelyOptimizeProperties(token[2], context);
    }
  }
}

function level2Optimize$1(tokens, context, withRestructuring) {
  var levelOptions = context.options.level[OptimizationLevel$1.Two];
  var level2Plugins = context.options.plugins.level2Block;
  var reduced;
  var i;

  recursivelyOptimizeBlocks(tokens, context);
  recursivelyOptimizeProperties(tokens, context);

  if (levelOptions.removeDuplicateRules) {
    removeDuplicates(tokens);
  }

  if (levelOptions.mergeAdjacentRules) {
    mergeAdjacent(tokens, context);
  }

  if (levelOptions.reduceNonAdjacentRules) {
    reduceNonAdjacent(tokens, context);
  }

  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'body') {
    mergeNonAdjacentBySelector(tokens, context);
  }

  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'selector') {
    mergeNonAdjacentByBody(tokens, context);
  }

  if (levelOptions.restructureRules && levelOptions.mergeAdjacentRules && withRestructuring) {
    restructure(tokens, context);
    mergeAdjacent(tokens, context);
  }

  if (levelOptions.restructureRules && !levelOptions.mergeAdjacentRules && withRestructuring) {
    restructure(tokens, context);
  }

  if (levelOptions.removeDuplicateFontRules) {
    removeDuplicateFontAtRules(tokens);
  }

  if (levelOptions.removeDuplicateMediaBlocks) {
    removeDuplicateMediaQueries(tokens);
  }

  if (levelOptions.removeUnusedAtRules) {
    removeUnusedAtRules(tokens, context);
  }

  if (levelOptions.mergeMedia) {
    reduced = mergeMediaQueries(tokens, context);
    for (i = reduced.length - 1; i >= 0; i--) {
      level2Optimize$1(reduced[i][2], context, false);
    }
  }

  for (i = 0; i < level2Plugins.length; i++) {
    level2Plugins[i](tokens);
  }

  if (levelOptions.removeEmpty) {
    removeEmpty(tokens);
  }

  return tokens;
}

var optimize$1 = level2Optimize$1;

var functionNoVendorRegexStr = '[A-Z]+(\\-|[A-Z]|[0-9])+\\(.*?\\)';
var functionVendorRegexStr = '\\-(\\-|[A-Z]|[0-9])+\\(.*?\\)';
var variableRegexStr = 'var\\(\\-\\-[^\\)]+\\)';
var functionAnyRegexStr = '(' + variableRegexStr + '|' + functionNoVendorRegexStr + '|' + functionVendorRegexStr + ')';

var calcRegex = new RegExp('^(\\-moz\\-|\\-webkit\\-)?calc\\([^\\)]+\\)$', 'i');
var decimalRegex = /[0-9]/;
var functionAnyRegex = new RegExp('^' + functionAnyRegexStr + '$', 'i');
var hexAlphaColorRegex = /^#(?:[0-9a-f]{4}|[0-9a-f]{8})$/i;
var hslColorRegex = /^hsl\(\s{0,31}[\-\.]?\d+\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31}\)|hsla\(\s{0,31}[\-\.]?\d+\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\.?\d+\s{0,31}\)$/;
var identifierRegex = /^(\-[a-z0-9_][a-z0-9\-_]*|[a-z_][a-z0-9\-_]*)$/i;
var namedEntityRegex = /^[a-z]+$/i;
var prefixRegex = /^-([a-z0-9]|-)*$/i;
var quotedTextRegex = /^("[^"]*"|'[^']*')$/i;
var rgbColorRegex = /^rgb\(\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31}\)|rgba\(\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\.\d]+\s{0,31}\)$/i;
var timeUnitPattern = /\d+(s|ms)/;
var timingFunctionRegex = /^(cubic\-bezier|steps)\([^\)]+\)$/;
var validTimeUnits = ['ms', 's'];
var urlRegex$1 = /^url\([\s\S]+\)$/i;
var variableRegex = new RegExp('^' + variableRegexStr + '$', 'i');

var eightValueColorRegex = /^#[0-9a-f]{8}$/i;
var fourValueColorRegex = /^#[0-9a-f]{4}$/i;
var sixValueColorRegex = /^#[0-9a-f]{6}$/i;
var threeValueColorRegex = /^#[0-9a-f]{3}$/i;

var DECIMAL_DOT = '.';
var MINUS_SIGN = '-';
var PLUS_SIGN = '+';

var Keywords = {
  '^': [
    'inherit',
    'initial',
    'unset'
  ],
  '*-style': [
    'auto',
    'dashed',
    'dotted',
    'double',
    'groove',
    'hidden',
    'inset',
    'none',
    'outset',
    'ridge',
    'solid'
  ],
  '*-timing-function': [
    'ease',
    'ease-in',
    'ease-in-out',
    'ease-out',
    'linear',
    'step-end',
    'step-start'
  ],
  'animation-direction': [
    'alternate',
    'alternate-reverse',
    'normal',
    'reverse'
  ],
  'animation-fill-mode': [
    'backwards',
    'both',
    'forwards',
    'none'
  ],
  'animation-iteration-count': [
    'infinite'
  ],
  'animation-name': [
    'none'
  ],
  'animation-play-state': [
    'paused',
    'running'
  ],
  'background-attachment': [
    'fixed',
    'inherit',
    'local',
    'scroll'
  ],
  'background-clip': [
    'border-box',
    'content-box',
    'inherit',
    'padding-box',
    'text'
  ],
  'background-origin': [
    'border-box',
    'content-box',
    'inherit',
    'padding-box'
  ],
  'background-position': [
    'bottom',
    'center',
    'left',
    'right',
    'top'
  ],
  'background-repeat': [
    'no-repeat',
    'inherit',
    'repeat',
    'repeat-x',
    'repeat-y',
    'round',
    'space'
  ],
  'background-size': [
    'auto',
    'cover',
    'contain'
  ],
  'border-collapse': [
    'collapse',
    'inherit',
    'separate'
  ],
  'bottom': [
    'auto'
  ],
  'clear': [
    'both',
    'left',
    'none',
    'right'
  ],
  'color': [
    'transparent'
  ],
  'cursor': [
    'all-scroll',
    'auto',
    'col-resize',
    'crosshair',
    'default',
    'e-resize',
    'help',
    'move',
    'n-resize',
    'ne-resize',
    'no-drop',
    'not-allowed',
    'nw-resize',
    'pointer',
    'progress',
    'row-resize',
    's-resize',
    'se-resize',
    'sw-resize',
    'text',
    'vertical-text',
    'w-resize',
    'wait'
  ],
  'display': [
    'block',
    'inline',
    'inline-block',
    'inline-table',
    'list-item',
    'none',
    'table',
    'table-caption',
    'table-cell',
    'table-column',
    'table-column-group',
    'table-footer-group',
    'table-header-group',
    'table-row',
    'table-row-group'
  ],
  'float': [
    'left',
    'none',
    'right'
  ],
  'left': [
    'auto'
  ],
  'font': [
    'caption',
    'icon',
    'menu',
    'message-box',
    'small-caption',
    'status-bar',
    'unset'
  ],
  'font-size': [
    'large',
    'larger',
    'medium',
    'small',
    'smaller',
    'x-large',
    'x-small',
    'xx-large',
    'xx-small'
  ],
  'font-stretch': [
    'condensed',
    'expanded',
    'extra-condensed',
    'extra-expanded',
    'normal',
    'semi-condensed',
    'semi-expanded',
    'ultra-condensed',
    'ultra-expanded'
  ],
  'font-style': [
    'italic',
    'normal',
    'oblique'
  ],
  'font-variant': [
    'normal',
    'small-caps'
  ],
  'font-weight': [
    '100',
    '200',
    '300',
    '400',
    '500',
    '600',
    '700',
    '800',
    '900',
    'bold',
    'bolder',
    'lighter',
    'normal'
  ],
  'line-height': [
    'normal'
  ],
  'list-style-position': [
    'inside',
    'outside'
  ],
  'list-style-type': [
    'armenian',
    'circle',
    'decimal',
    'decimal-leading-zero',
    'disc',
    'decimal|disc', // this is the default value of list-style-type, see comment in configuration.js
    'georgian',
    'lower-alpha',
    'lower-greek',
    'lower-latin',
    'lower-roman',
    'none',
    'square',
    'upper-alpha',
    'upper-latin',
    'upper-roman'
  ],
  'overflow': [
    'auto',
    'hidden',
    'scroll',
    'visible'
  ],
  'position': [
    'absolute',
    'fixed',
    'relative',
    'static'
  ],
  'right': [
    'auto'
  ],
  'text-align': [
    'center',
    'justify',
    'left',
    'left|right', // this is the default value of list-style-type, see comment in configuration.js
    'right'
  ],
  'text-decoration': [
    'line-through',
    'none',
    'overline',
    'underline'
  ],
  'text-overflow': [
    'clip',
    'ellipsis'
  ],
  'top': [
    'auto'
  ],
  'vertical-align': [
    'baseline',
    'bottom',
    'middle',
    'sub',
    'super',
    'text-bottom',
    'text-top',
    'top'
  ],
  'visibility': [
    'collapse',
    'hidden',
    'visible'
  ],
  'white-space': [
    'normal',
    'nowrap',
    'pre'
  ],
  'width': [
    'inherit',
    'initial',
    'medium',
    'thick',
    'thin'
  ]
};

var Units = [
  '%',
  'ch',
  'cm',
  'em',
  'ex',
  'in',
  'mm',
  'pc',
  'pt',
  'px',
  'rem',
  'vh',
  'vm',
  'vmax',
  'vmin',
  'vw'
];

function isColor(value) {
  return value != 'auto' &&
    (
      isKeyword('color')(value) ||
      isHexColor(value) ||
      isColorFunction(value) ||
      isNamedEntity(value)
    );
}

function isColorFunction(value) {
  return isRgbColor(value) || isHslColor(value);
}

function isDynamicUnit(value) {
  return calcRegex.test(value);
}

function isFunction$2(value) {
  return functionAnyRegex.test(value);
}

function isHexColor(value) {
  return threeValueColorRegex.test(value) || fourValueColorRegex.test(value) || sixValueColorRegex.test(value) || eightValueColorRegex.test(value);
}

function isHslColor(value) {
  return hslColorRegex.test(value);
}

function isHexAlphaColor(value) {
  return hexAlphaColorRegex.test(value);
}

function isIdentifier(value) {
  return identifierRegex.test(value);
}

function isQuotedText(value) {
  return quotedTextRegex.test(value);
}

function isImage(value) {
  return value == 'none' || value == 'inherit' || isUrl(value);
}

function isKeyword(propertyName) {
  return function(value) {
    return Keywords[propertyName].indexOf(value) > -1;
  };
}

function isNamedEntity(value) {
  return namedEntityRegex.test(value);
}

function isNumber$1(value) {
  return scanForNumber(value) == value.length;
}

function isRgbColor(value) {
  return rgbColorRegex.test(value);
}

function isPrefixed(value) {
  return prefixRegex.test(value);
}

function isPositiveNumber(value) {
  return isNumber$1(value) &&
    parseFloat(value) >= 0;
}

function isVariable(value) {
  return variableRegex.test(value);
}

function isTime(value) {
  var numberUpTo = scanForNumber(value);

  return numberUpTo == value.length && parseInt(value) === 0 ||
    numberUpTo > -1 && validTimeUnits.indexOf(value.slice(numberUpTo + 1)) > -1 ||
    isCalculatedTime(value);
}

function isCalculatedTime(value) {
  return isFunction$2(value) && timeUnitPattern.test(value);
}

function isTimingFunction() {
  var isTimingFunctionKeyword = isKeyword('*-timing-function');

  return function (value) {
    return isTimingFunctionKeyword(value) || timingFunctionRegex.test(value);
  };
}

function isUnit(validUnits, value) {
  var numberUpTo = scanForNumber(value);

  return numberUpTo == value.length && parseInt(value) === 0 ||
    numberUpTo > -1 && validUnits.indexOf(value.slice(numberUpTo + 1).toLowerCase()) > -1 ||
    value == 'auto' ||
    value == 'inherit';
}

function isUrl(value) {
  return urlRegex$1.test(value);
}

function isZIndex(value) {
  return value == 'auto' ||
    isNumber$1(value) ||
    isKeyword('^')(value);
}

function scanForNumber(value) {
  var hasDot = false;
  var hasSign = false;
  var character;
  var i, l;

  for (i = 0, l = value.length; i < l; i++) {
    character = value[i];

    if (i === 0 && (character == PLUS_SIGN || character == MINUS_SIGN)) {
      hasSign = true;
    } else if (i > 0 && hasSign && (character == PLUS_SIGN || character == MINUS_SIGN)) {
      return i - 1;
    } else if (character == DECIMAL_DOT && !hasDot) {
      hasDot = true;
    } else if (character == DECIMAL_DOT && hasDot) {
      return i - 1;
    } else if (decimalRegex.test(character)) {
      continue;
    } else {
      return i - 1;
    }
  }

  return i;
}

function validator$1(compatibility) {
  var validUnits = Units.slice(0).filter(function (value) {
    return !(value in compatibility.units) || compatibility.units[value] === true;
  });

  if (compatibility.customUnits.rpx) {
    validUnits.push('rpx');
  }

  return {
    colorOpacity: compatibility.colors.opacity,
    colorHexAlpha: compatibility.colors.hexAlpha,
    isAnimationDirectionKeyword: isKeyword('animation-direction'),
    isAnimationFillModeKeyword: isKeyword('animation-fill-mode'),
    isAnimationIterationCountKeyword: isKeyword('animation-iteration-count'),
    isAnimationNameKeyword: isKeyword('animation-name'),
    isAnimationPlayStateKeyword: isKeyword('animation-play-state'),
    isTimingFunction: isTimingFunction(),
    isBackgroundAttachmentKeyword: isKeyword('background-attachment'),
    isBackgroundClipKeyword: isKeyword('background-clip'),
    isBackgroundOriginKeyword: isKeyword('background-origin'),
    isBackgroundPositionKeyword: isKeyword('background-position'),
    isBackgroundRepeatKeyword: isKeyword('background-repeat'),
    isBackgroundSizeKeyword: isKeyword('background-size'),
    isColor: isColor,
    isColorFunction: isColorFunction,
    isDynamicUnit: isDynamicUnit,
    isFontKeyword: isKeyword('font'),
    isFontSizeKeyword: isKeyword('font-size'),
    isFontStretchKeyword: isKeyword('font-stretch'),
    isFontStyleKeyword: isKeyword('font-style'),
    isFontVariantKeyword: isKeyword('font-variant'),
    isFontWeightKeyword: isKeyword('font-weight'),
    isFunction: isFunction$2,
    isGlobal: isKeyword('^'),
    isHexAlphaColor: isHexAlphaColor,
    isHslColor: isHslColor,
    isIdentifier: isIdentifier,
    isImage: isImage,
    isKeyword: isKeyword,
    isLineHeightKeyword: isKeyword('line-height'),
    isListStylePositionKeyword: isKeyword('list-style-position'),
    isListStyleTypeKeyword: isKeyword('list-style-type'),
    isNumber: isNumber$1,
    isPrefixed: isPrefixed,
    isPositiveNumber: isPositiveNumber,
    isQuotedText: isQuotedText,
    isRgbColor: isRgbColor,
    isStyleKeyword: isKeyword('*-style'),
    isTime: isTime,
    isUnit: isUnit.bind(null, validUnits),
    isUrl: isUrl,
    isVariable: isVariable,
    isWidth: isKeyword('width'),
    isZIndex: isZIndex
  };
}

var validator_1 = validator$1;

var DEFAULTS = {
  '*': {
    colors: {
      hexAlpha: false, // 4- and 8-character hex notation
      opacity: true // rgba / hsla
    },
    customUnits: {
      rpx: false
    },
    properties: {
      backgroundClipMerging: true, // background-clip to shorthand
      backgroundOriginMerging: true, // background-origin to shorthand
      backgroundSizeMerging: true, // background-size to shorthand
      colors: true, // any kind of color transformations, like `#ff00ff` to `#f0f` or `#fff` into `red`
      ieBangHack: false, // !ie suffix hacks on IE<8
      ieFilters: false, // whether to preserve `filter` and `-ms-filter` properties
      iePrefixHack: false, // underscore / asterisk prefix hacks on IE
      ieSuffixHack: false, // \9 suffix hacks on IE6-9, \0 suffix hack on IE6-11
      merging: true, // merging properties into one
      shorterLengthUnits: false, // optimize pixel units into `pt`, `pc` or `in` units
      spaceAfterClosingBrace: true, // 'url() no-repeat' to 'url()no-repeat'
      urlQuotes: true, // whether to wrap content of `url()` into quotes or not
      zeroUnits: true // 0[unit] -> 0
    },
    selectors: {
      adjacentSpace: false, // div+ nav Android stock browser hack
      ie7Hack: false, // *+html hack
      mergeablePseudoClasses: [
        ':active',
        ':after',
        ':before',
        ':empty',
        ':checked',
        ':disabled',
        ':empty',
        ':enabled',
        ':first-child',
        ':first-letter',
        ':first-line',
        ':first-of-type',
        ':focus',
        ':hover',
        ':lang',
        ':last-child',
        ':last-of-type',
        ':link',
        ':not',
        ':nth-child',
        ':nth-last-child',
        ':nth-last-of-type',
        ':nth-of-type',
        ':only-child',
        ':only-of-type',
        ':root',
        ':target',
        ':visited'
      ], // selectors with these pseudo-classes can be merged as these are universally supported
      mergeablePseudoElements: [
        '::after',
        '::before',
        '::first-letter',
        '::first-line'
      ], // selectors with these pseudo-elements can be merged as these are universally supported
      mergeLimit: 8191, // number of rules that can be safely merged together
      multiplePseudoMerging: true
    },
    units: {
      ch: true,
      in: true,
      pc: true,
      pt: true,
      rem: true,
      vh: true,
      vm: true, // vm is vmin on IE9+ see https://developer.mozilla.org/en-US/docs/Web/CSS/length
      vmax: true,
      vmin: true,
      vw: true
    }
  }
};

DEFAULTS.ie11 = merge(DEFAULTS['*'], {
  properties: {
    ieSuffixHack: true
  }
});

DEFAULTS.ie10 = merge(DEFAULTS['*'], {
  properties: {
    ieSuffixHack: true
  }
});

DEFAULTS.ie9 = merge(DEFAULTS['*'], {
  properties: {
    ieFilters: true,
    ieSuffixHack: true
  }
});

DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
  colors: {
    opacity: false
  },
  properties: {
    backgroundClipMerging: false,
    backgroundOriginMerging: false,
    backgroundSizeMerging: false,
    iePrefixHack: true,
    merging: false
  },
  selectors: {
    mergeablePseudoClasses: [
      ':after',
      ':before',
      ':first-child',
      ':first-letter',
      ':focus',
      ':hover',
      ':visited'
    ],
    mergeablePseudoElements: []
  },
  units: {
    ch: false,
    rem: false,
    vh: false,
    vm: false,
    vmax: false,
    vmin: false,
    vw: false
  }
});

DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
  properties: {
    ieBangHack: true
  },
  selectors: {
    ie7Hack: true,
    mergeablePseudoClasses: [
      ':first-child',
      ':first-letter',
      ':hover',
      ':visited'
    ]
  },
});

function compatibilityFrom$1(source) {
  return merge(DEFAULTS['*'], calculateSource(source));
}

function merge(source, target) {
  for (var key in source) {
    if (Object.prototype.hasOwnProperty.call(source, key)) {
      var value = source[key];

      if (Object.prototype.hasOwnProperty.call(target, key) && typeof value === 'object' && !Array.isArray(value)) {
        target[key] = merge(value, target[key] || {});
      } else {
        target[key] = key in target ? target[key] : value;
      }
    }
  }

  return target;
}

function calculateSource(source) {
  if (typeof source == 'object')
    return source;

  if (!/[,\+\-]/.test(source))
    return DEFAULTS[source] || DEFAULTS['*'];

  var parts = source.split(',');
  var template = parts[0] in DEFAULTS ?
    DEFAULTS[parts.shift()] :
    DEFAULTS['*'];

  source = {};

  parts.forEach(function (part) {
    var isAdd = part[0] == '+';
    var key = part.substring(1).split('.');
    var group = key[0];
    var option = key[1];

    source[group] = source[group] || {};
    source[group][option] = isAdd;
  });

  return merge(template, source);
}

var compatibility = compatibilityFrom$1;

var lookup = [];
var revLookup = [];
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
var inited = false;
function init () {
  inited = true;
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i];
    revLookup[code.charCodeAt(i)] = i;
  }

  revLookup['-'.charCodeAt(0)] = 62;
  revLookup['_'.charCodeAt(0)] = 63;
}

function toByteArray (b64) {
  if (!inited) {
    init();
  }
  var i, j, l, tmp, placeHolders, arr;
  var len = b64.length;

  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // the number of equal signs (place holders)
  // if there are two placeholders, than the two characters before it
  // represent one byte
  // if there is only one, then the three characters before it represent 2 bytes
  // this is just a cheap hack to not do indexOf twice
  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0;

  // base64 is 4/3 + up to two characters of the original data
  arr = new Arr(len * 3 / 4 - placeHolders);

  // if there are placeholders, only get up to the last complete 4 chars
  l = placeHolders > 0 ? len - 4 : len;

  var L = 0;

  for (i = 0, j = 0; i < l; i += 4, j += 3) {
    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)];
    arr[L++] = (tmp >> 16) & 0xFF;
    arr[L++] = (tmp >> 8) & 0xFF;
    arr[L++] = tmp & 0xFF;
  }

  if (placeHolders === 2) {
    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
    arr[L++] = tmp & 0xFF;
  } else if (placeHolders === 1) {
    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2);
    arr[L++] = (tmp >> 8) & 0xFF;
    arr[L++] = tmp & 0xFF;
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp;
  var output = [];
  for (var i = start; i < end; i += 3) {
    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]);
    output.push(tripletToBase64(tmp));
  }
  return output.join('')
}

function fromByteArray (uint8) {
  if (!inited) {
    init();
  }
  var tmp;
  var len = uint8.length;
  var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
  var output = '';
  var parts = [];
  var maxChunkLength = 16383; // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1];
    output += lookup[tmp >> 2];
    output += lookup[(tmp << 4) & 0x3F];
    output += '==';
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + (uint8[len - 1]);
    output += lookup[tmp >> 10];
    output += lookup[(tmp >> 4) & 0x3F];
    output += lookup[(tmp << 2) & 0x3F];
    output += '=';
  }

  parts.push(output);

  return parts.join('')
}

function read (buffer, offset, isLE, mLen, nBytes) {
  var e, m;
  var eLen = nBytes * 8 - mLen - 1;
  var eMax = (1 << eLen) - 1;
  var eBias = eMax >> 1;
  var nBits = -7;
  var i = isLE ? (nBytes - 1) : 0;
  var d = isLE ? -1 : 1;
  var s = buffer[offset + i];

  i += d;

  e = s & ((1 << (-nBits)) - 1);
  s >>= (-nBits);
  nBits += eLen;
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1);
  e >>= (-nBits);
  nBits += mLen;
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias;
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen);
    e = e - eBias;
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

function write (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c;
  var eLen = nBytes * 8 - mLen - 1;
  var eMax = (1 << eLen) - 1;
  var eBias = eMax >> 1;
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0);
  var i = isLE ? 0 : (nBytes - 1);
  var d = isLE ? 1 : -1;
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;

  value = Math.abs(value);

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0;
    e = eMax;
  } else {
    e = Math.floor(Math.log(value) / Math.LN2);
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--;
      c *= 2;
    }
    if (e + eBias >= 1) {
      value += rt / c;
    } else {
      value += rt * Math.pow(2, 1 - eBias);
    }
    if (value * c >= 2) {
      e++;
      c /= 2;
    }

    if (e + eBias >= eMax) {
      m = 0;
      e = eMax;
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen);
      e = e + eBias;
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
      e = 0;
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m;
  eLen += mLen;
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128;
}

var toString = {}.toString;

var isArray$2 = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */

var INSPECT_MAX_BYTES = 50;

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * Due to various browser bugs, sometimes the Object implementation will be used even
 * when the browser supports typed arrays.
 *
 * Note:
 *
 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 *
 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 *
 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
 *     incorrect length in some situations.

 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
 * get the Object implementation, which is slower but behaves correctly.
 */
Buffer$1.TYPED_ARRAY_SUPPORT = global$1.TYPED_ARRAY_SUPPORT !== undefined
  ? global$1.TYPED_ARRAY_SUPPORT
  : true;

/*
 * Export kMaxLength after typed array support is determined.
 */
kMaxLength();

function kMaxLength () {
  return Buffer$1.TYPED_ARRAY_SUPPORT
    ? 0x7fffffff
    : 0x3fffffff
}

function createBuffer (that, length) {
  if (kMaxLength() < length) {
    throw new RangeError('Invalid typed array length')
  }
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = new Uint8Array(length);
    that.__proto__ = Buffer$1.prototype;
  } else {
    // Fallback: Return an object instance of the Buffer class
    if (that === null) {
      that = new Buffer$1(length);
    }
    that.length = length;
  }

  return that
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer$1 (arg, encodingOrOffset, length) {
  if (!Buffer$1.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer$1)) {
    return new Buffer$1(arg, encodingOrOffset, length)
  }

  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new Error(
        'If encoding is specified then the first argument must be a string'
      )
    }
    return allocUnsafe(this, arg)
  }
  return from(this, arg, encodingOrOffset, length)
}

Buffer$1.poolSize = 8192; // not used by this implementation

// TODO: Legacy, not needed anymore. Remove in next major version.
Buffer$1._augment = function (arr) {
  arr.__proto__ = Buffer$1.prototype;
  return arr
};

function from (that, value, encodingOrOffset, length) {
  if (typeof value === 'number') {
    throw new TypeError('"value" argument must not be a number')
  }

  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
    return fromArrayBuffer(that, value, encodingOrOffset, length)
  }

  if (typeof value === 'string') {
    return fromString$1(that, value, encodingOrOffset)
  }

  return fromObject(that, value)
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer$1.from = function (value, encodingOrOffset, length) {
  return from(null, value, encodingOrOffset, length)
};

if (Buffer$1.TYPED_ARRAY_SUPPORT) {
  Buffer$1.prototype.__proto__ = Uint8Array.prototype;
  Buffer$1.__proto__ = Uint8Array;
  if (typeof Symbol !== 'undefined' && Symbol.species &&
      Buffer$1[Symbol.species] === Buffer$1) ;
}

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be a number')
  } else if (size < 0) {
    throw new RangeError('"size" argument must not be negative')
  }
}

function alloc (that, size, fill, encoding) {
  assertSize(size);
  if (size <= 0) {
    return createBuffer(that, size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(that, size).fill(fill, encoding)
      : createBuffer(that, size).fill(fill)
  }
  return createBuffer(that, size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer$1.alloc = function (size, fill, encoding) {
  return alloc(null, size, fill, encoding)
};

function allocUnsafe (that, size) {
  assertSize(size);
  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0);
  if (!Buffer$1.TYPED_ARRAY_SUPPORT) {
    for (var i = 0; i < size; ++i) {
      that[i] = 0;
    }
  }
  return that
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer$1.allocUnsafe = function (size) {
  return allocUnsafe(null, size)
};
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer$1.allocUnsafeSlow = function (size) {
  return allocUnsafe(null, size)
};

function fromString$1 (that, string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8';
  }

  if (!Buffer$1.isEncoding(encoding)) {
    throw new TypeError('"encoding" must be a valid string encoding')
  }

  var length = byteLength(string, encoding) | 0;
  that = createBuffer(that, length);

  var actual = that.write(string, encoding);

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    that = that.slice(0, actual);
  }

  return that
}

function fromArrayLike (that, array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0;
  that = createBuffer(that, length);
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255;
  }
  return that
}

function fromArrayBuffer (that, array, byteOffset, length) {
  array.byteLength; // this throws if `array` is not a valid ArrayBuffer

  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('\'offset\' is out of bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('\'length\' is out of bounds')
  }

  if (byteOffset === undefined && length === undefined) {
    array = new Uint8Array(array);
  } else if (length === undefined) {
    array = new Uint8Array(array, byteOffset);
  } else {
    array = new Uint8Array(array, byteOffset, length);
  }

  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = array;
    that.__proto__ = Buffer$1.prototype;
  } else {
    // Fallback: Return an object instance of the Buffer class
    that = fromArrayLike(that, array);
  }
  return that
}

function fromObject (that, obj) {
  if (internalIsBuffer(obj)) {
    var len = checked(obj.length) | 0;
    that = createBuffer(that, len);

    if (that.length === 0) {
      return that
    }

    obj.copy(that, 0, 0, len);
    return that
  }

  if (obj) {
    if ((typeof ArrayBuffer !== 'undefined' &&
        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
      if (typeof obj.length !== 'number' || isnan(obj.length)) {
        return createBuffer(that, 0)
      }
      return fromArrayLike(that, obj)
    }

    if (obj.type === 'Buffer' && isArray$2(obj.data)) {
      return fromArrayLike(that, obj.data)
    }
  }

  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
}

function checked (length) {
  // Note: cannot use `length < kMaxLength()` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= kMaxLength()) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
  }
  return length | 0
}
Buffer$1.isBuffer = isBuffer;
function internalIsBuffer (b) {
  return !!(b != null && b._isBuffer)
}

Buffer$1.compare = function compare (a, b) {
  if (!internalIsBuffer(a) || !internalIsBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length;
  var y = b.length;

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i];
      y = b[i];
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
};

Buffer$1.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
};

Buffer$1.concat = function concat (list, length) {
  if (!isArray$2(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer$1.alloc(0)
  }

  var i;
  if (length === undefined) {
    length = 0;
    for (i = 0; i < list.length; ++i) {
      length += list[i].length;
    }
  }

  var buffer = Buffer$1.allocUnsafe(length);
  var pos = 0;
  for (i = 0; i < list.length; ++i) {
    var buf = list[i];
    if (!internalIsBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos);
    pos += buf.length;
  }
  return buffer
};

function byteLength (string, encoding) {
  if (internalIsBuffer(string)) {
    return string.length
  }
  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    string = '' + string;
  }

  var len = string.length;
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false;
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
      case undefined:
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase();
        loweredCase = true;
    }
  }
}
Buffer$1.byteLength = byteLength;

function slowToString (encoding, start, end) {
  var loweredCase = false;

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0;
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length;
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0;
  start >>>= 0;

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8';

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase();
        loweredCase = true;
    }
  }
}

// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
// Buffer instances.
Buffer$1.prototype._isBuffer = true;

function swap$1 (b, n, m) {
  var i = b[n];
  b[n] = b[m];
  b[m] = i;
}

Buffer$1.prototype.swap16 = function swap16 () {
  var len = this.length;
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap$1(this, i, i + 1);
  }
  return this
};

Buffer$1.prototype.swap32 = function swap32 () {
  var len = this.length;
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap$1(this, i, i + 3);
    swap$1(this, i + 1, i + 2);
  }
  return this
};

Buffer$1.prototype.swap64 = function swap64 () {
  var len = this.length;
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap$1(this, i, i + 7);
    swap$1(this, i + 1, i + 6);
    swap$1(this, i + 2, i + 5);
    swap$1(this, i + 3, i + 4);
  }
  return this
};

Buffer$1.prototype.toString = function toString () {
  var length = this.length | 0;
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
};

Buffer$1.prototype.equals = function equals (b) {
  if (!internalIsBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer$1.compare(this, b) === 0
};

Buffer$1.prototype.inspect = function inspect () {
  var str = '';
  var max = INSPECT_MAX_BYTES;
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ');
    if (this.length > max) str += ' ... ';
  }
  return '<Buffer ' + str + '>'
};

Buffer$1.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (!internalIsBuffer(target)) {
    throw new TypeError('Argument must be a Buffer')
  }

  if (start === undefined) {
    start = 0;
  }
  if (end === undefined) {
    end = target ? target.length : 0;
  }
  if (thisStart === undefined) {
    thisStart = 0;
  }
  if (thisEnd === undefined) {
    thisEnd = this.length;
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0;
  end >>>= 0;
  thisStart >>>= 0;
  thisEnd >>>= 0;

  if (this === target) return 0

  var x = thisEnd - thisStart;
  var y = end - start;
  var len = Math.min(x, y);

  var thisCopy = this.slice(thisStart, thisEnd);
  var targetCopy = target.slice(start, end);

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i];
      y = targetCopy[i];
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
};

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset;
    byteOffset = 0;
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff;
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000;
  }
  byteOffset = +byteOffset;  // Coerce to Number.
  if (isNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1);
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset;
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1;
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0;
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer$1.from(val, encoding);
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (internalIsBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF; // Search for a byte value [0-255]
    if (Buffer$1.TYPED_ARRAY_SUPPORT &&
        typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1;
  var arrLength = arr.length;
  var valLength = val.length;

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase();
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2;
      arrLength /= 2;
      valLength /= 2;
      byteOffset /= 2;
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i;
  if (dir) {
    var foundIndex = -1;
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i;
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex;
        foundIndex = -1;
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength;
    for (i = byteOffset; i >= 0; i--) {
      var found = true;
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false;
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer$1.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
};

Buffer$1.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
};

Buffer$1.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
};

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0;
  var remaining = buf.length - offset;
  if (!length) {
    length = remaining;
  } else {
    length = Number(length);
    if (length > remaining) {
      length = remaining;
    }
  }

  // must be an even number of digits
  var strLen = string.length;
  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2;
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16);
    if (isNaN(parsed)) return i
    buf[offset + i] = parsed;
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer$1.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8';
    length = this.length;
    offset = 0;
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset;
    length = this.length;
    offset = 0;
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset | 0;
    if (isFinite(length)) {
      length = length | 0;
      if (encoding === undefined) encoding = 'utf8';
    } else {
      encoding = length;
      length = undefined;
    }
  // legacy write(string, encoding, offset, length) - remove in v0.13
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset;
  if (length === undefined || length > remaining) length = remaining;

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8';

  var loweredCase = false;
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'latin1':
      case 'binary':
        return latin1Write(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase();
        loweredCase = true;
    }
  }
};

Buffer$1.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
};

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return fromByteArray(buf)
  } else {
    return fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end);
  var res = [];

  var i = start;
  while (i < end) {
    var firstByte = buf[i];
    var codePoint = null;
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1;

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint;

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte;
          }
          break
        case 2:
          secondByte = buf[i + 1];
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F);
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint;
            }
          }
          break
        case 3:
          secondByte = buf[i + 1];
          thirdByte = buf[i + 2];
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F);
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint;
            }
          }
          break
        case 4:
          secondByte = buf[i + 1];
          thirdByte = buf[i + 2];
          fourthByte = buf[i + 3];
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F);
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint;
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD;
      bytesPerSequence = 1;
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000;
      res.push(codePoint >>> 10 & 0x3FF | 0xD800);
      codePoint = 0xDC00 | codePoint & 0x3FF;
    }

    res.push(codePoint);
    i += bytesPerSequence;
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000;

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length;
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = '';
  var i = 0;
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    );
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = '';
  end = Math.min(buf.length, end);

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F);
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = '';
  end = Math.min(buf.length, end);

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i]);
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length;

  if (!start || start < 0) start = 0;
  if (!end || end < 0 || end > len) end = len;

  var out = '';
  for (var i = start; i < end; ++i) {
    out += toHex(buf[i]);
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end);
  var res = '';
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256);
  }
  return res
}

Buffer$1.prototype.slice = function slice (start, end) {
  var len = this.length;
  start = ~~start;
  end = end === undefined ? len : ~~end;

  if (start < 0) {
    start += len;
    if (start < 0) start = 0;
  } else if (start > len) {
    start = len;
  }

  if (end < 0) {
    end += len;
    if (end < 0) end = 0;
  } else if (end > len) {
    end = len;
  }

  if (end < start) end = start;

  var newBuf;
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    newBuf = this.subarray(start, end);
    newBuf.__proto__ = Buffer$1.prototype;
  } else {
    var sliceLen = end - start;
    newBuf = new Buffer$1(sliceLen, undefined);
    for (var i = 0; i < sliceLen; ++i) {
      newBuf[i] = this[i + start];
    }
  }

  return newBuf
};

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer$1.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var val = this[offset];
  var mul = 1;
  var i = 0;
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul;
  }

  return val
};

Buffer$1.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length);
  }

  var val = this[offset + --byteLength];
  var mul = 1;
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul;
  }

  return val
};

Buffer$1.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length);
  return this[offset]
};

Buffer$1.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  return this[offset] | (this[offset + 1] << 8)
};

Buffer$1.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  return (this[offset] << 8) | this[offset + 1]
};

Buffer$1.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
};

Buffer$1.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
};

Buffer$1.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var val = this[offset];
  var mul = 1;
  var i = 0;
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul;
  }
  mul *= 0x80;

  if (val >= mul) val -= Math.pow(2, 8 * byteLength);

  return val
};

Buffer$1.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var i = byteLength;
  var mul = 1;
  var val = this[offset + --i];
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul;
  }
  mul *= 0x80;

  if (val >= mul) val -= Math.pow(2, 8 * byteLength);

  return val
};

Buffer$1.prototype.readInt8 = function readInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length);
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
};

Buffer$1.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  var val = this[offset] | (this[offset + 1] << 8);
  return (val & 0x8000) ? val | 0xFFFF0000 : val
};

Buffer$1.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  var val = this[offset + 1] | (this[offset] << 8);
  return (val & 0x8000) ? val | 0xFFFF0000 : val
};

Buffer$1.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
};

Buffer$1.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
};

Buffer$1.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);
  return read(this, offset, true, 23, 4)
};

Buffer$1.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);
  return read(this, offset, false, 23, 4)
};

Buffer$1.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length);
  return read(this, offset, true, 52, 8)
};

Buffer$1.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length);
  return read(this, offset, false, 52, 8)
};

function checkInt (buf, value, offset, ext, max, min) {
  if (!internalIsBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer$1.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1;
    checkInt(this, value, offset, byteLength, maxBytes, 0);
  }

  var mul = 1;
  var i = 0;
  this[offset] = value & 0xFF;
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF;
  }

  return offset + byteLength
};

Buffer$1.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1;
    checkInt(this, value, offset, byteLength, maxBytes, 0);
  }

  var i = byteLength - 1;
  var mul = 1;
  this[offset + i] = value & 0xFF;
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF;
  }

  return offset + byteLength
};

Buffer$1.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0);
  if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
  this[offset] = (value & 0xff);
  return offset + 1
};

function objectWriteUInt16 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffff + value + 1;
  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
      (littleEndian ? i : 1 - i) * 8;
  }
}

Buffer$1.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
  } else {
    objectWriteUInt16(this, value, offset, true);
  }
  return offset + 2
};

Buffer$1.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8);
    this[offset + 1] = (value & 0xff);
  } else {
    objectWriteUInt16(this, value, offset, false);
  }
  return offset + 2
};

function objectWriteUInt32 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffffffff + value + 1;
  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff;
  }
}

Buffer$1.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset + 3] = (value >>> 24);
    this[offset + 2] = (value >>> 16);
    this[offset + 1] = (value >>> 8);
    this[offset] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, true);
  }
  return offset + 4
};

Buffer$1.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24);
    this[offset + 1] = (value >>> 16);
    this[offset + 2] = (value >>> 8);
    this[offset + 3] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, false);
  }
  return offset + 4
};

Buffer$1.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1);

    checkInt(this, value, offset, byteLength, limit - 1, -limit);
  }

  var i = 0;
  var mul = 1;
  var sub = 0;
  this[offset] = value & 0xFF;
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1;
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
  }

  return offset + byteLength
};

Buffer$1.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1);

    checkInt(this, value, offset, byteLength, limit - 1, -limit);
  }

  var i = byteLength - 1;
  var mul = 1;
  var sub = 0;
  this[offset + i] = value & 0xFF;
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1;
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
  }

  return offset + byteLength
};

Buffer$1.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80);
  if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
  if (value < 0) value = 0xff + value + 1;
  this[offset] = (value & 0xff);
  return offset + 1
};

Buffer$1.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
  } else {
    objectWriteUInt16(this, value, offset, true);
  }
  return offset + 2
};

Buffer$1.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8);
    this[offset + 1] = (value & 0xff);
  } else {
    objectWriteUInt16(this, value, offset, false);
  }
  return offset + 2
};

Buffer$1.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
    this[offset + 2] = (value >>> 16);
    this[offset + 3] = (value >>> 24);
  } else {
    objectWriteUInt32(this, value, offset, true);
  }
  return offset + 4
};

Buffer$1.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  if (value < 0) value = 0xffffffff + value + 1;
  if (Buffer$1.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24);
    this[offset + 1] = (value >>> 16);
    this[offset + 2] = (value >>> 8);
    this[offset + 3] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, false);
  }
  return offset + 4
};

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4);
  }
  write(buf, value, offset, littleEndian, 23, 4);
  return offset + 4
}

Buffer$1.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
};

Buffer$1.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
};

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8);
  }
  write(buf, value, offset, littleEndian, 52, 8);
  return offset + 8
}

Buffer$1.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
};

Buffer$1.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
};

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer$1.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0;
  if (!end && end !== 0) end = this.length;
  if (targetStart >= target.length) targetStart = target.length;
  if (!targetStart) targetStart = 0;
  if (end > 0 && end < start) end = start;

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length;
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start;
  }

  var len = end - start;
  var i;

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; --i) {
      target[i + targetStart] = this[i + start];
    }
  } else if (len < 1000 || !Buffer$1.TYPED_ARRAY_SUPPORT) {
    // ascending copy from start
    for (i = 0; i < len; ++i) {
      target[i + targetStart] = this[i + start];
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, start + len),
      targetStart
    );
  }

  return len
};

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer$1.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start;
      start = 0;
      end = this.length;
    } else if (typeof end === 'string') {
      encoding = end;
      end = this.length;
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0);
      if (code < 256) {
        val = code;
      }
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer$1.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
  } else if (typeof val === 'number') {
    val = val & 255;
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0;
  end = end === undefined ? this.length : end >>> 0;

  if (!val) val = 0;

  var i;
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val;
    }
  } else {
    var bytes = internalIsBuffer(val)
      ? val
      : utf8ToBytes(new Buffer$1(val, encoding).toString());
    var len = bytes.length;
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len];
    }
  }

  return this
};

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g;

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = stringtrim(str).replace(INVALID_BASE64_RE, '');
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '=';
  }
  return str
}

function stringtrim (str) {
  if (str.trim) return str.trim()
  return str.replace(/^\s+|\s+$/g, '')
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity;
  var codePoint;
  var length = string.length;
  var leadSurrogate = null;
  var bytes = [];

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i);

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
          continue
        }

        // valid lead
        leadSurrogate = codePoint;

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
        leadSurrogate = codePoint;
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000;
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
    }

    leadSurrogate = null;

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint);
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      );
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      );
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      );
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = [];
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF);
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo;
  var byteArray = [];
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i);
    hi = c >> 8;
    lo = c % 256;
    byteArray.push(lo);
    byteArray.push(hi);
  }

  return byteArray
}


function base64ToBytes (str) {
  return toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i];
  }
  return i
}

function isnan (val) {
  return val !== val // eslint-disable-line no-self-compare
}


// the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence
// The _isBuffer check is for Safari 5-7 support, because it's missing
// Object.prototype.constructor. Remove this eventually
function isBuffer(obj) {
  return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj))
}

function isFastBuffer (obj) {
  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
}

// For Node v0.10 support. Remove this eventually.
function isSlowBuffer (obj) {
  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer(obj.slice(0, 0))
}

var hasFetch = isFunction$1(global$1.fetch) && isFunction$1(global$1.ReadableStream);

var _blobConstructor;
function blobConstructor() {
  if (typeof _blobConstructor !== 'undefined') {
    return _blobConstructor;
  }
  try {
    new global$1.Blob([new ArrayBuffer(1)]);
    _blobConstructor = true;
  } catch (e) {
    _blobConstructor = false;
  }
  return _blobConstructor
}
var xhr;

function checkTypeSupport(type) {
  if (!xhr) {
    xhr = new global$1.XMLHttpRequest();
    // If location.host is empty, e.g. if this page/worker was loaded
    // from a Blob, then use example.com to avoid an error
    xhr.open('GET', global$1.location.host ? '/' : 'https://example.com');
  }
  try {
    xhr.responseType = type;
    return xhr.responseType === type
  } catch (e) {
    return false
  }

}

// For some strange reason, Safari 7.0 reports typeof global.ArrayBuffer === 'object'.
// Safari 7.1 appears to have fixed this bug.
var haveArrayBuffer = typeof global$1.ArrayBuffer !== 'undefined';
var haveSlice = haveArrayBuffer && isFunction$1(global$1.ArrayBuffer.prototype.slice);

var arraybuffer = haveArrayBuffer && checkTypeSupport('arraybuffer');
  // These next two tests unavoidably show warnings in Chrome. Since fetch will always
  // be used if it's available, just return false for these to avoid the warnings.
var msstream = !hasFetch && haveSlice && checkTypeSupport('ms-stream');
var mozchunkedarraybuffer = !hasFetch && haveArrayBuffer &&
  checkTypeSupport('moz-chunked-arraybuffer');
var overrideMimeType = isFunction$1(xhr.overrideMimeType);
var vbArray = isFunction$1(global$1.VBArray);

function isFunction$1(value) {
  return typeof value === 'function'
}

xhr = null; // Help gc

var inherits;
if (typeof Object.create === 'function'){
  inherits = function inherits(ctor, superCtor) {
    // implementation from standard node.js 'util' module
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  inherits = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor;
    var TempCtor = function () {};
    TempCtor.prototype = superCtor.prototype;
    ctor.prototype = new TempCtor();
    ctor.prototype.constructor = ctor;
  };
}
var inherits$1 = inherits;

var formatRegExp = /%[sdj%]/g;
function format$2(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
}

// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
function deprecate(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global$1.process)) {
    return function() {
      return deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (browser$1.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (browser$1.throwDeprecation) {
        throw new Error(msg);
      } else if (browser$1.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

var debugs = {};
var debugEnviron;
function debuglog(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = browser$1.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = 0;
      debugs[set] = function() {
        var msg = format$2.apply(null, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
}

/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    _extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}

// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray$1(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty$2(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty$2(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var length = output.reduce(function(prev, cur) {
    if (cur.indexOf('\n') >= 0) ;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray$1(ar) {
  return Array.isArray(ar);
}

function isBoolean(arg) {
  return typeof arg === 'boolean';
}

function isNull(arg) {
  return arg === null;
}

function isNullOrUndefined(arg) {
  return arg == null;
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isString(arg) {
  return typeof arg === 'string';
}

function isUndefined(arg) {
  return arg === void 0;
}

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}

function isFunction(arg) {
  return typeof arg === 'function';
}

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

function _extend(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
}
function hasOwnProperty$2(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

var domain;

// This constructor is used to store event handlers. Instantiating this is
// faster than explicitly calling `Object.create(null)` to get a "clean" empty
// object (tested with v8 v4.9).
function EventHandlers() {}
EventHandlers.prototype = Object.create(null);

function EventEmitter() {
  EventEmitter.init.call(this);
}

// nodejs oddity
// require('events') === require('events').EventEmitter
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.usingDomains = false;

EventEmitter.prototype.domain = undefined;
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

EventEmitter.init = function() {
  this.domain = null;
  if (EventEmitter.usingDomains) {
    // if there is an active domain, then attach to it.
    if (domain.active ) ;
  }

  if (!this._events || this._events === Object.getPrototypeOf(this)._events) {
    this._events = new EventHandlers();
    this._eventsCount = 0;
  }

  this._maxListeners = this._maxListeners || undefined;
};

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
  if (typeof n !== 'number' || n < 0 || isNaN(n))
    throw new TypeError('"n" argument must be a positive number');
  this._maxListeners = n;
  return this;
};

function $getMaxListeners(that) {
  if (that._maxListeners === undefined)
    return EventEmitter.defaultMaxListeners;
  return that._maxListeners;
}

EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
  return $getMaxListeners(this);
};

// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
  if (isFn)
    handler.call(self);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self);
  }
}
function emitOne(handler, isFn, self, arg1) {
  if (isFn)
    handler.call(self, arg1);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1);
  }
}
function emitTwo(handler, isFn, self, arg1, arg2) {
  if (isFn)
    handler.call(self, arg1, arg2);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2);
  }
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
  if (isFn)
    handler.call(self, arg1, arg2, arg3);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2, arg3);
  }
}

function emitMany(handler, isFn, self, args) {
  if (isFn)
    handler.apply(self, args);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].apply(self, args);
  }
}

EventEmitter.prototype.emit = function emit(type) {
  var er, handler, len, args, i, events, domain;
  var doError = (type === 'error');

  events = this._events;
  if (events)
    doError = (doError && events.error == null);
  else if (!doError)
    return false;

  domain = this.domain;

  // If there is no 'error' event listener then throw.
  if (doError) {
    er = arguments[1];
    if (domain) {
      if (!er)
        er = new Error('Uncaught, unspecified "error" event');
      er.domainEmitter = this;
      er.domain = domain;
      er.domainThrown = false;
      domain.emit('error', er);
    } else if (er instanceof Error) {
      throw er; // Unhandled 'error' event
    } else {
      // At least give some kind of context to the user
      var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
      err.context = er;
      throw err;
    }
    return false;
  }

  handler = events[type];

  if (!handler)
    return false;

  var isFn = typeof handler === 'function';
  len = arguments.length;
  switch (len) {
    // fast cases
    case 1:
      emitNone(handler, isFn, this);
      break;
    case 2:
      emitOne(handler, isFn, this, arguments[1]);
      break;
    case 3:
      emitTwo(handler, isFn, this, arguments[1], arguments[2]);
      break;
    case 4:
      emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
      break;
    // slower
    default:
      args = new Array(len - 1);
      for (i = 1; i < len; i++)
        args[i - 1] = arguments[i];
      emitMany(handler, isFn, this, args);
  }

  return true;
};

function _addListener(target, type, listener, prepend) {
  var m;
  var events;
  var existing;

  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');

  events = target._events;
  if (!events) {
    events = target._events = new EventHandlers();
    target._eventsCount = 0;
  } else {
    // To avoid recursion in the case that type === "newListener"! Before
    // adding it to the listeners, first emit "newListener".
    if (events.newListener) {
      target.emit('newListener', type,
                  listener.listener ? listener.listener : listener);

      // Re-assign `events` because a newListener handler could have caused the
      // this._events to be assigned to a new object
      events = target._events;
    }
    existing = events[type];
  }

  if (!existing) {
    // Optimize the case of one listener. Don't need the extra array object.
    existing = events[type] = listener;
    ++target._eventsCount;
  } else {
    if (typeof existing === 'function') {
      // Adding the second element, need to change to array.
      existing = events[type] = prepend ? [listener, existing] :
                                          [existing, listener];
    } else {
      // If we've already got an array, just append.
      if (prepend) {
        existing.unshift(listener);
      } else {
        existing.push(listener);
      }
    }

    // Check for listener leak
    if (!existing.warned) {
      m = $getMaxListeners(target);
      if (m && m > 0 && existing.length > m) {
        existing.warned = true;
        var w = new Error('Possible EventEmitter memory leak detected. ' +
                            existing.length + ' ' + type + ' listeners added. ' +
                            'Use emitter.setMaxListeners() to increase limit');
        w.name = 'MaxListenersExceededWarning';
        w.emitter = target;
        w.type = type;
        w.count = existing.length;
        emitWarning(w);
      }
    }
  }

  return target;
}
function emitWarning(e) {
  typeof console.warn === 'function' ? console.warn(e) : console.log(e);
}
EventEmitter.prototype.addListener = function addListener(type, listener) {
  return _addListener(this, type, listener, false);
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.prependListener =
    function prependListener(type, listener) {
      return _addListener(this, type, listener, true);
    };

function _onceWrap(target, type, listener) {
  var fired = false;
  function g() {
    target.removeListener(type, g);
    if (!fired) {
      fired = true;
      listener.apply(target, arguments);
    }
  }
  g.listener = listener;
  return g;
}

EventEmitter.prototype.once = function once(type, listener) {
  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');
  this.on(type, _onceWrap(this, type, listener));
  return this;
};

EventEmitter.prototype.prependOnceListener =
    function prependOnceListener(type, listener) {
      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');
      this.prependListener(type, _onceWrap(this, type, listener));
      return this;
    };

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener =
    function removeListener(type, listener) {
      var list, events, position, i, originalListener;

      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');

      events = this._events;
      if (!events)
        return this;

      list = events[type];
      if (!list)
        return this;

      if (list === listener || (list.listener && list.listener === listener)) {
        if (--this._eventsCount === 0)
          this._events = new EventHandlers();
        else {
          delete events[type];
          if (events.removeListener)
            this.emit('removeListener', type, list.listener || listener);
        }
      } else if (typeof list !== 'function') {
        position = -1;

        for (i = list.length; i-- > 0;) {
          if (list[i] === listener ||
              (list[i].listener && list[i].listener === listener)) {
            originalListener = list[i].listener;
            position = i;
            break;
          }
        }

        if (position < 0)
          return this;

        if (list.length === 1) {
          list[0] = undefined;
          if (--this._eventsCount === 0) {
            this._events = new EventHandlers();
            return this;
          } else {
            delete events[type];
          }
        } else {
          spliceOne(list, position);
        }

        if (events.removeListener)
          this.emit('removeListener', type, originalListener || listener);
      }

      return this;
    };
    
// Alias for removeListener added in NodeJS 10.0
// https://nodejs.org/api/events.html#events_emitter_off_eventname_listener
EventEmitter.prototype.off = function(type, listener){
    return this.removeListener(type, listener);
};

EventEmitter.prototype.removeAllListeners =
    function removeAllListeners(type) {
      var listeners, events;

      events = this._events;
      if (!events)
        return this;

      // not listening for removeListener, no need to emit
      if (!events.removeListener) {
        if (arguments.length === 0) {
          this._events = new EventHandlers();
          this._eventsCount = 0;
        } else if (events[type]) {
          if (--this._eventsCount === 0)
            this._events = new EventHandlers();
          else
            delete events[type];
        }
        return this;
      }

      // emit removeListener for all listeners on all events
      if (arguments.length === 0) {
        var keys = Object.keys(events);
        for (var i = 0, key; i < keys.length; ++i) {
          key = keys[i];
          if (key === 'removeListener') continue;
          this.removeAllListeners(key);
        }
        this.removeAllListeners('removeListener');
        this._events = new EventHandlers();
        this._eventsCount = 0;
        return this;
      }

      listeners = events[type];

      if (typeof listeners === 'function') {
        this.removeListener(type, listeners);
      } else if (listeners) {
        // LIFO order
        do {
          this.removeListener(type, listeners[listeners.length - 1]);
        } while (listeners[0]);
      }

      return this;
    };

EventEmitter.prototype.listeners = function listeners(type) {
  var evlistener;
  var ret;
  var events = this._events;

  if (!events)
    ret = [];
  else {
    evlistener = events[type];
    if (!evlistener)
      ret = [];
    else if (typeof evlistener === 'function')
      ret = [evlistener.listener || evlistener];
    else
      ret = unwrapListeners(evlistener);
  }

  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  if (typeof emitter.listenerCount === 'function') {
    return emitter.listenerCount(type);
  } else {
    return listenerCount$1.call(emitter, type);
  }
};

EventEmitter.prototype.listenerCount = listenerCount$1;
function listenerCount$1(type) {
  var events = this._events;

  if (events) {
    var evlistener = events[type];

    if (typeof evlistener === 'function') {
      return 1;
    } else if (evlistener) {
      return evlistener.length;
    }
  }

  return 0;
}

EventEmitter.prototype.eventNames = function eventNames() {
  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
};

// About 1.5x faster than the two-arg version of Array#splice().
function spliceOne(list, index) {
  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
    list[i] = list[k];
  list.pop();
}

function arrayClone(arr, i) {
  var copy = new Array(i);
  while (i--)
    copy[i] = arr[i];
  return copy;
}

function unwrapListeners(arr) {
  var ret = new Array(arr.length);
  for (var i = 0; i < ret.length; ++i) {
    ret[i] = arr[i].listener || arr[i];
  }
  return ret;
}

function BufferList() {
  this.head = null;
  this.tail = null;
  this.length = 0;
}

BufferList.prototype.push = function (v) {
  var entry = { data: v, next: null };
  if (this.length > 0) this.tail.next = entry;else this.head = entry;
  this.tail = entry;
  ++this.length;
};

BufferList.prototype.unshift = function (v) {
  var entry = { data: v, next: this.head };
  if (this.length === 0) this.tail = entry;
  this.head = entry;
  ++this.length;
};

BufferList.prototype.shift = function () {
  if (this.length === 0) return;
  var ret = this.head.data;
  if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
  --this.length;
  return ret;
};

BufferList.prototype.clear = function () {
  this.head = this.tail = null;
  this.length = 0;
};

BufferList.prototype.join = function (s) {
  if (this.length === 0) return '';
  var p = this.head;
  var ret = '' + p.data;
  while (p = p.next) {
    ret += s + p.data;
  }return ret;
};

BufferList.prototype.concat = function (n) {
  if (this.length === 0) return Buffer$1.alloc(0);
  if (this.length === 1) return this.head.data;
  var ret = Buffer$1.allocUnsafe(n >>> 0);
  var p = this.head;
  var i = 0;
  while (p) {
    p.data.copy(ret, i);
    i += p.data.length;
    p = p.next;
  }
  return ret;
};

// Copyright Joyent, Inc. and other Node contributors.
var isBufferEncoding = Buffer$1.isEncoding
  || function(encoding) {
       switch (encoding && encoding.toLowerCase()) {
         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
         default: return false;
       }
     };


function assertEncoding(encoding) {
  if (encoding && !isBufferEncoding(encoding)) {
    throw new Error('Unknown encoding: ' + encoding);
  }
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters. CESU-8 is handled as part of the UTF-8 encoding.
//
// @TODO Handling all encodings inside a single object makes it very difficult
// to reason about this code, so it should be split up in the future.
// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
// points as used by CESU-8.
function StringDecoder(encoding) {
  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
  assertEncoding(encoding);
  switch (this.encoding) {
    case 'utf8':
      // CESU-8 represents each of Surrogate Pair by 3-bytes
      this.surrogateSize = 3;
      break;
    case 'ucs2':
    case 'utf16le':
      // UTF-16 represents each of Surrogate Pair by 2-bytes
      this.surrogateSize = 2;
      this.detectIncompleteChar = utf16DetectIncompleteChar;
      break;
    case 'base64':
      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
      this.surrogateSize = 3;
      this.detectIncompleteChar = base64DetectIncompleteChar;
      break;
    default:
      this.write = passThroughWrite;
      return;
  }

  // Enough space to store all bytes of a single character. UTF-8 needs 4
  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
  this.charBuffer = new Buffer$1(6);
  // Number of bytes received for the current incomplete multi-byte character.
  this.charReceived = 0;
  // Number of bytes expected for the current incomplete multi-byte character.
  this.charLength = 0;
}

// write decodes the given buffer and returns it as JS string that is
// guaranteed to not contain any partial multi-byte characters. Any partial
// character found at the end of the buffer is buffered up, and will be
// returned when calling write again with the remaining bytes.
//
// Note: Converting a Buffer containing an orphan surrogate to a String
// currently works, but converting a String to a Buffer (via `new Buffer`, or
// Buffer#write) will replace incomplete surrogates with the unicode
// replacement character. See https://codereview.chromium.org/121173009/ .
StringDecoder.prototype.write = function(buffer) {
  var charStr = '';
  // if our last write ended with an incomplete multibyte character
  while (this.charLength) {
    // determine how many remaining bytes this buffer has to offer for this char
    var available = (buffer.length >= this.charLength - this.charReceived) ?
        this.charLength - this.charReceived :
        buffer.length;

    // add the new bytes to the char buffer
    buffer.copy(this.charBuffer, this.charReceived, 0, available);
    this.charReceived += available;

    if (this.charReceived < this.charLength) {
      // still not enough chars in this buffer? wait for more ...
      return '';
    }

    // remove bytes belonging to the current character from the buffer
    buffer = buffer.slice(available, buffer.length);

    // get the character that was split
    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);

    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
    var charCode = charStr.charCodeAt(charStr.length - 1);
    if (charCode >= 0xD800 && charCode <= 0xDBFF) {
      this.charLength += this.surrogateSize;
      charStr = '';
      continue;
    }
    this.charReceived = this.charLength = 0;

    // if there are no more bytes in this buffer, just emit our char
    if (buffer.length === 0) {
      return charStr;
    }
    break;
  }

  // determine and set charLength / charReceived
  this.detectIncompleteChar(buffer);

  var end = buffer.length;
  if (this.charLength) {
    // buffer the incomplete character bytes we got
    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
    end -= this.charReceived;
  }

  charStr += buffer.toString(this.encoding, 0, end);

  var end = charStr.length - 1;
  var charCode = charStr.charCodeAt(end);
  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
  if (charCode >= 0xD800 && charCode <= 0xDBFF) {
    var size = this.surrogateSize;
    this.charLength += size;
    this.charReceived += size;
    this.charBuffer.copy(this.charBuffer, size, 0, size);
    buffer.copy(this.charBuffer, 0, 0, size);
    return charStr.substring(0, end);
  }

  // or just emit the charStr
  return charStr;
};

// detectIncompleteChar determines if there is an incomplete UTF-8 character at
// the end of the given buffer. If so, it sets this.charLength to the byte
// length that character, and sets this.charReceived to the number of bytes
// that are available for this character.
StringDecoder.prototype.detectIncompleteChar = function(buffer) {
  // determine how many bytes we have to check at the end of this buffer
  var i = (buffer.length >= 3) ? 3 : buffer.length;

  // Figure out if one of the last i bytes of our buffer announces an
  // incomplete char.
  for (; i > 0; i--) {
    var c = buffer[buffer.length - i];

    // See http://en.wikipedia.org/wiki/UTF-8#Description

    // 110XXXXX
    if (i == 1 && c >> 5 == 0x06) {
      this.charLength = 2;
      break;
    }

    // 1110XXXX
    if (i <= 2 && c >> 4 == 0x0E) {
      this.charLength = 3;
      break;
    }

    // 11110XXX
    if (i <= 3 && c >> 3 == 0x1E) {
      this.charLength = 4;
      break;
    }
  }
  this.charReceived = i;
};

StringDecoder.prototype.end = function(buffer) {
  var res = '';
  if (buffer && buffer.length)
    res = this.write(buffer);

  if (this.charReceived) {
    var cr = this.charReceived;
    var buf = this.charBuffer;
    var enc = this.encoding;
    res += buf.slice(0, cr).toString(enc);
  }

  return res;
};

function passThroughWrite(buffer) {
  return buffer.toString(this.encoding);
}

function utf16DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 2;
  this.charLength = this.charReceived ? 2 : 0;
}

function base64DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 3;
  this.charLength = this.charReceived ? 3 : 0;
}

Readable.ReadableState = ReadableState;

var debug = debuglog('stream');
inherits$1(Readable, EventEmitter);

function prependListener(emitter, event, fn) {
  // Sadly this is not cacheable as some libraries bundle their own
  // event emitter implementation with them.
  if (typeof emitter.prependListener === 'function') {
    return emitter.prependListener(event, fn);
  } else {
    // This is a hack to make sure that our error handler is attached before any
    // userland ones.  NEVER DO THIS. This is here only because this code needs
    // to continue to work with older versions of Node.js that do not include
    // the prependListener() method. The goal is to eventually remove this hack.
    if (!emitter._events || !emitter._events[event])
      emitter.on(event, fn);
    else if (Array.isArray(emitter._events[event]))
      emitter._events[event].unshift(fn);
    else
      emitter._events[event] = [fn, emitter._events[event]];
  }
}
function listenerCount (emitter, type) {
  return emitter.listeners(type).length;
}
function ReadableState(options, stream) {

  options = options || {};

  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  // A linked list is used to store data chunks instead of an array because the
  // linked list can remove elements from the beginning faster than
  // array.shift()
  this.buffer = new BufferList();
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // when piping, we only care about 'readable' events that happen
  // after read()ing all the bytes and not getting any pushback.
  this.ranOut = false;

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}
function Readable(options) {

  if (!(this instanceof Readable)) return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  if (options && typeof options.read === 'function') this._read = options.read;

  EventEmitter.call(this);
}

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;

  if (!state.objectMode && typeof chunk === 'string') {
    encoding = encoding || state.defaultEncoding;
    if (encoding !== state.encoding) {
      chunk = Buffer$1.from(chunk, encoding);
      encoding = '';
    }
  }

  return readableAddChunk(this, state, chunk, encoding, false);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
  var state = this._readableState;
  return readableAddChunk(this, state, chunk, '', true);
};

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
};

function readableAddChunk(stream, state, chunk, encoding, addToFront) {
  var er = chunkInvalid(state, chunk);
  if (er) {
    stream.emit('error', er);
  } else if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else if (state.objectMode || chunk && chunk.length > 0) {
    if (state.ended && !addToFront) {
      var e = new Error('stream.push() after EOF');
      stream.emit('error', e);
    } else if (state.endEmitted && addToFront) {
      var _e = new Error('stream.unshift() after end event');
      stream.emit('error', _e);
    } else {
      var skipAdd;
      if (state.decoder && !addToFront && !encoding) {
        chunk = state.decoder.write(chunk);
        skipAdd = !state.objectMode && chunk.length === 0;
      }

      if (!addToFront) state.reading = false;

      // Don't add to the buffer if we've decoded to an empty string chunk and
      // we're not in object mode
      if (!skipAdd) {
        // if we want the data now, just emit it.
        if (state.flowing && state.length === 0 && !state.sync) {
          stream.emit('data', chunk);
          stream.read(0);
        } else {
          // update the buffer info.
          state.length += state.objectMode ? 1 : chunk.length;
          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);

          if (state.needReadable) emitReadable(stream);
        }
      }

      maybeReadMore(stream, state);
    }
  } else if (!addToFront) {
    state.reading = false;
  }

  return needMoreData(state);
}

// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}

// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
  return this;
};

// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
  if (n <= 0 || state.length === 0 && state.ended) return 0;
  if (state.objectMode) return 1;
  if (n !== n) {
    // Only flow one buffer at a time
    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
  }
  // If we're asking for more than the current hwm, then raise the hwm.
  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
  if (n <= state.length) return n;
  // Don't have enough
  if (!state.ended) {
    state.needReadable = true;
    return 0;
  }
  return state.length;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
  debug('read', n);
  n = parseInt(n, 10);
  var state = this._readableState;
  var nOrig = n;

  if (n !== 0) state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
    debug('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;
  debug('need readable', doRead);

  // if we currently have less than the highWaterMark, then also read some
  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug('length less than watermark', doRead);
  }

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading) {
    doRead = false;
    debug('reading or ended', doRead);
  } else if (doRead) {
    debug('do read');
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0) state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
    // If _read pushed data synchronously, then `reading` will be false,
    // and we need to re-evaluate how much data we can return to the user.
    if (!state.reading) n = howMuchToRead(nOrig, state);
  }

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  } else {
    state.length -= n;
  }

  if (state.length === 0) {
    // If we have nothing in the buffer, then we want to know
    // as soon as we *do* get something into the buffer.
    if (!state.ended) state.needReadable = true;

    // If we tried to read() past the EOF, then emit end on the next tick.
    if (nOrig !== n && state.ended) endReadable(this);
  }

  if (ret !== null) this.emit('data', ret);

  return ret;
};

function chunkInvalid(state, chunk) {
  var er = null;
  if (!Buffer$1.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}

function onEofChunk(stream, state) {
  if (state.ended) return;
  if (state.decoder) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // emit 'readable' now to make sure it gets picked up.
  emitReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (!state.emittedReadable) {
    debug('emitReadable', state.flowing);
    state.emittedReadable = true;
    if (state.sync) nextTick(emitReadable_, stream);else emitReadable_(stream);
  }
}

function emitReadable_(stream) {
  debug('emit readable');
  stream.emit('readable');
  flow(stream);
}

// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    nextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
    debug('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;else len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
  this.emit('error', new Error('not implemented'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;
  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

  var doEnd = (!pipeOpts || pipeOpts.end !== false);

  var endFn = doEnd ? onend : cleanup;
  if (state.endEmitted) nextTick(endFn);else src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable) {
    debug('onunpipe');
    if (readable === src) {
      cleanup();
    }
  }

  function onend() {
    debug('onend');
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  var cleanedUp = false;
  function cleanup() {
    debug('cleanup');
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', cleanup);
    src.removeListener('data', ondata);

    cleanedUp = true;

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  // If the user pushes more data while we're writing to dest then we'll end up
  // in ondata again. However, we only want to increase awaitDrain once because
  // dest will only emit one 'drain' event for the multiple writes.
  // => Introduce a guard on increasing awaitDrain.
  var increasedAwaitDrain = false;
  src.on('data', ondata);
  function ondata(chunk) {
    debug('ondata');
    increasedAwaitDrain = false;
    var ret = dest.write(chunk);
    if (false === ret && !increasedAwaitDrain) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      // => Check whether `dest` is still a piping destination.
      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
        debug('false write response, pause', src._readableState.awaitDrain);
        src._readableState.awaitDrain++;
        increasedAwaitDrain = true;
      }
      src.pause();
    }
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    debug('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (listenerCount(dest, 'error') === 0) dest.emit('error', er);
  }

  // Make sure our error handler is attached before userland ones.
  prependListener(dest, 'error', onerror);

  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    debug('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    debug('unpipe');
    src.unpipe(dest);
  }

  // tell the dest that it's being piped to
  dest.emit('pipe', src);

  // start the flow if it hasn't been started already.
  if (!state.flowing) {
    debug('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function () {
    var state = src._readableState;
    debug('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;
    if (state.awaitDrain === 0 && src.listeners('data').length) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;

  // if we're not piping anywhere, then do nothing.
  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.
  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;

    if (!dest) dest = state.pipes;

    // got a match.
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this);
    return this;
  }

  // slow case. multiple pipe destinations.

  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var _i = 0; _i < len; _i++) {
      dests[_i].emit('unpipe', this);
    }return this;
  }

  // try to find the right one.
  var i = indexOf(state.pipes, dest);
  if (i === -1) return this;

  state.pipes.splice(i, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];

  dest.emit('unpipe', this);

  return this;
};

// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
  var res = EventEmitter.prototype.on.call(this, ev, fn);

  if (ev === 'data') {
    // Start flowing on next tick if stream isn't explicitly paused
    if (this._readableState.flowing !== false) this.resume();
  } else if (ev === 'readable') {
    var state = this._readableState;
    if (!state.endEmitted && !state.readableListening) {
      state.readableListening = state.needReadable = true;
      state.emittedReadable = false;
      if (!state.reading) {
        nextTick(nReadingNextTick, this);
      } else if (state.length) {
        emitReadable(this);
      }
    }
  }

  return res;
};
Readable.prototype.addListener = Readable.prototype.on;

function nReadingNextTick(self) {
  debug('readable nexttick read 0');
  self.read(0);
}

// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
  var state = this._readableState;
  if (!state.flowing) {
    debug('resume');
    state.flowing = true;
    resume(this, state);
  }
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    nextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  if (!state.reading) {
    debug('resume read 0');
    stream.read(0);
  }

  state.resumeScheduled = false;
  state.awaitDrain = 0;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug('call pause flowing=%j', this._readableState.flowing);
  if (false !== this._readableState.flowing) {
    debug('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug('flow', state.flowing);
  while (state.flowing && stream.read() !== null) {}
}

// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
  var state = this._readableState;
  var paused = false;

  var self = this;
  stream.on('end', function () {
    debug('wrapped end');
    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) self.push(chunk);
    }

    self.push(null);
  });

  stream.on('data', function (chunk) {
    debug('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk);

    // don't skip over falsy values in objectMode
    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = self.push(chunk);
    if (!ret) {
      paused = true;
      stream.pause();
    }
  });

  // proxy all the other methods.
  // important when wrapping filters and duplexes.
  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function (method) {
        return function () {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  }

  // proxy certain important events.
  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
  forEach(events, function (ev) {
    stream.on(ev, self.emit.bind(self, ev));
  });

  // when we try to consume some more bytes, simply unpause the
  // underlying stream.
  self._read = function (n) {
    debug('wrapped _read', n);
    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return self;
};

// exposed for testing purposes only.
Readable._fromList = fromList;

// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
  // nothing buffered
  if (state.length === 0) return null;

  var ret;
  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
    // read it all, truncate the list
    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
    state.buffer.clear();
  } else {
    // read part of list
    ret = fromListPartial(n, state.buffer, state.decoder);
  }

  return ret;
}

// Extracts only enough buffered data to satisfy the amount requested.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromListPartial(n, list, hasStrings) {
  var ret;
  if (n < list.head.data.length) {
    // slice is the same for buffers and strings
    ret = list.head.data.slice(0, n);
    list.head.data = list.head.data.slice(n);
  } else if (n === list.head.data.length) {
    // first chunk is a perfect match
    ret = list.shift();
  } else {
    // result spans more than one buffer
    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
  }
  return ret;
}

// Copies a specified amount of characters from the list of buffered data
// chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBufferString(n, list) {
  var p = list.head;
  var c = 1;
  var ret = p.data;
  n -= ret.length;
  while (p = p.next) {
    var str = p.data;
    var nb = n > str.length ? str.length : n;
    if (nb === str.length) ret += str;else ret += str.slice(0, n);
    n -= nb;
    if (n === 0) {
      if (nb === str.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = str.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

// Copies a specified amount of bytes from the list of buffered data chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBuffer(n, list) {
  var ret = Buffer$1.allocUnsafe(n);
  var p = list.head;
  var c = 1;
  p.data.copy(ret);
  n -= p.data.length;
  while (p = p.next) {
    var buf = p.data;
    var nb = n > buf.length ? buf.length : n;
    buf.copy(ret, ret.length - n, 0, nb);
    n -= nb;
    if (n === 0) {
      if (nb === buf.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = buf.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;

  // If we get here before consuming all the bytes, then that is a
  // bug in node.  Should never happen.
  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');

  if (!state.endEmitted) {
    state.ended = true;
    nextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  // Check that we didn't get one last unshift.
  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');
  }
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }
  return -1;
}

// A bit simpler than readable streams.
Writable.WritableState = WritableState;
inherits$1(Writable, EventEmitter);

function nop() {}

function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
}

function WritableState(options, stream) {
  Object.defineProperty(this, 'buffer', {
    get: deprecate(function () {
      return this.getBuffer();
    }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
  });
  options = options || {};

  // object stream flag to indicate whether or not this stream
  // contains buffers or objects.
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

  // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  this.needDrain = false;
  // at the start of calling end()
  this.ending = false;
  // when end() has been called, and returned
  this.ended = false;
  // when 'finish' is emitted
  this.finished = false;

  // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.
  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.
  this.length = 0;

  // a flag to see when we're in the middle of a write.
  this.writing = false;

  // when true all writes will be buffered until .uncork() call
  this.corked = 0;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.
  this.bufferProcessing = false;

  // the callback that's passed to _write(chunk,cb)
  this.onwrite = function (er) {
    onwrite(stream, er);
  };

  // the callback that the user supplies to write(chunk,encoding,cb)
  this.writecb = null;

  // the amount that is being written when _write is called.
  this.writelen = 0;

  this.bufferedRequest = null;
  this.lastBufferedRequest = null;

  // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted
  this.pendingcb = 0;

  // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams
  this.prefinished = false;

  // True if the error was already emitted and should not be thrown again
  this.errorEmitted = false;

  // count buffered requests
  this.bufferedRequestCount = 0;

  // allocate the first CorkedRequest, there is always
  // one allocated and free to use, and we maintain at most two
  this.corkedRequestsFree = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function writableStateGetBuffer() {
  var current = this.bufferedRequest;
  var out = [];
  while (current) {
    out.push(current);
    current = current.next;
  }
  return out;
};
function Writable(options) {

  // Writable ctor is applied to Duplexes, though they're not
  // instanceof Writable, they're instanceof Readable.
  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);

  this._writableState = new WritableState(options, this);

  // legacy.
  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;

    if (typeof options.writev === 'function') this._writev = options.writev;
  }

  EventEmitter.call(this);
}

// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
  this.emit('error', new Error('Cannot pipe, not readable'));
};

function writeAfterEnd(stream, cb) {
  var er = new Error('write after end');
  // TODO: defer error events consistently everywhere, not just the cb
  stream.emit('error', er);
  nextTick(cb, er);
}

// If we get something that is not a buffer, string, null, or undefined,
// and we're not in objectMode, then that's an error.
// Otherwise stream chunks are all considered to be of length=1, and the
// watermarks determine how many objects to keep in the buffer, rather than
// how many bytes or characters.
function validChunk(stream, state, chunk, cb) {
  var valid = true;
  var er = false;
  // Always throw error if a null is written
  // if we are not in object mode then throw
  // if it is not a buffer, string, or undefined.
  if (chunk === null) {
    er = new TypeError('May not write null values to stream');
  } else if (!Buffer$1.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  if (er) {
    stream.emit('error', er);
    nextTick(cb, er);
    valid = false;
  }
  return valid;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (Buffer$1.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;

  if (typeof cb !== 'function') cb = nop;

  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, chunk, encoding, cb);
  }

  return ret;
};

Writable.prototype.cork = function () {
  var state = this._writableState;

  state.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;

    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
  this._writableState.defaultEncoding = encoding;
  return this;
};

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = Buffer$1.from(chunk, encoding);
  }
  return chunk;
}

// if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, chunk, encoding, cb) {
  chunk = decodeChunk(state, chunk, encoding);

  if (Buffer$1.isBuffer(chunk)) encoding = 'buffer';
  var len = state.objectMode ? 1 : chunk.length;

  state.length += len;

  var ret = state.length < state.highWaterMark;
  // we must ensure that previous needDrain will not be reset to false.
  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }
    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;
  if (sync) nextTick(cb, er);else cb(er);

  stream._writableState.errorEmitted = true;
  stream.emit('error', er);
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;

  onwriteStateUpdate(state);

  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state);

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      /*<replacement>*/
        nextTick(afterWrite, stream, state, finished, cb);
      /*</replacement>*/
    } else {
        afterWrite(stream, state, finished, cb);
      }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
}

// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
}

// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;

    var count = 0;
    while (entry) {
      buffer[count] = entry;
      entry = entry.next;
      count += 1;
    }

    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

    // doWrite is almost always async, defer these to save a bit of time
    // as the hot path ends with doWrite
    state.pendingcb++;
    state.lastBufferedRequest = null;
    if (holder.next) {
      state.corkedRequestsFree = holder.next;
      holder.next = null;
    } else {
      state.corkedRequestsFree = new CorkedRequest(state);
    }
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;

      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.
      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequestCount = 0;
  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new Error('not implemented'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

  // .end() fully uncorks
  if (state.corked) {
    state.corked = 1;
    this.uncork();
  }

  // ignore unnecessary end() calls.
  if (!state.ending && !state.finished) endWritable(this, state, cb);
};

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}

function prefinish(stream, state) {
  if (!state.prefinished) {
    state.prefinished = true;
    stream.emit('prefinish');
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);
  if (need) {
    if (state.pendingcb === 0) {
      prefinish(stream, state);
      state.finished = true;
      stream.emit('finish');
    } else {
      prefinish(stream, state);
    }
  }
  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);
  if (cb) {
    if (state.finished) nextTick(cb);else stream.once('finish', cb);
  }
  state.ended = true;
  stream.writable = false;
}

// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;

  this.finish = function (err) {
    var entry = _this.entry;
    _this.entry = null;
    while (entry) {
      var cb = entry.callback;
      state.pendingcb--;
      cb(err);
      entry = entry.next;
    }
    if (state.corkedRequestsFree) {
      state.corkedRequestsFree.next = _this;
    } else {
      state.corkedRequestsFree = _this;
    }
  };
}

inherits$1(Duplex, Readable);

var keys = Object.keys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
  var method = keys[v];
  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}
function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false) this.readable = false;

  if (options && options.writable === false) this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended) return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  nextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

// a transform stream is a readable/writable stream where you do
inherits$1(Transform, Duplex);

function TransformState(stream) {
  this.afterTransform = function (er, data) {
    return afterTransform(stream, er, data);
  };

  this.needTransform = false;
  this.transforming = false;
  this.writecb = null;
  this.writechunk = null;
  this.writeencoding = null;
}

function afterTransform(stream, er, data) {
  var ts = stream._transformState;
  ts.transforming = false;

  var cb = ts.writecb;

  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));

  ts.writechunk = null;
  ts.writecb = null;

  if (data !== null && data !== undefined) stream.push(data);

  cb(er);

  var rs = stream._readableState;
  rs.reading = false;
  if (rs.needReadable || rs.length < rs.highWaterMark) {
    stream._read(rs.highWaterMark);
  }
}
function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);

  Duplex.call(this, options);

  this._transformState = new TransformState(this);

  // when the writable side finishes, then flush out anything remaining.
  var stream = this;

  // start out asking for a readable event once data is transformed.
  this._readableState.needReadable = true;

  // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.
  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;

    if (typeof options.flush === 'function') this._flush = options.flush;
  }

  this.once('prefinish', function () {
    if (typeof this._flush === 'function') this._flush(function (er) {
      done(stream, er);
    });else done(stream);
  });
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
};

// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
  throw new Error('Not implemented');
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;
  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
};

// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
    ts.transforming = true;
    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

function done(stream, er) {
  if (er) return stream.emit('error', er);

  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided
  var ws = stream._writableState;
  var ts = stream._transformState;

  if (ws.length) throw new Error('Calling transform done when ws.length != 0');

  if (ts.transforming) throw new Error('Calling transform done when still transforming');

  return stream.push(null);
}

inherits$1(PassThrough, Transform);
function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};

inherits$1(Stream, EventEmitter);
Stream.Readable = Readable;
Stream.Writable = Writable;
Stream.Duplex = Duplex;
Stream.Transform = Transform;
Stream.PassThrough = PassThrough;

// Backwards-compat with node 0.4.x
Stream.Stream = Stream;

// old-style streams.  Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.

function Stream() {
  EventEmitter.call(this);
}

Stream.prototype.pipe = function(dest, options) {
  var source = this;

  function ondata(chunk) {
    if (dest.writable) {
      if (false === dest.write(chunk) && source.pause) {
        source.pause();
      }
    }
  }

  source.on('data', ondata);

  function ondrain() {
    if (source.readable && source.resume) {
      source.resume();
    }
  }

  dest.on('drain', ondrain);

  // If the 'end' option is not supplied, dest.end() will be called when
  // source gets the 'end' or 'close' events.  Only dest.end() once.
  if (!dest._isStdio && (!options || options.end !== false)) {
    source.on('end', onend);
    source.on('close', onclose);
  }

  var didOnEnd = false;
  function onend() {
    if (didOnEnd) return;
    didOnEnd = true;

    dest.end();
  }


  function onclose() {
    if (didOnEnd) return;
    didOnEnd = true;

    if (typeof dest.destroy === 'function') dest.destroy();
  }

  // don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    if (EventEmitter.listenerCount(this, 'error') === 0) {
      throw er; // Unhandled stream error in pipe.
    }
  }

  source.on('error', onerror);
  dest.on('error', onerror);

  // remove all the event listeners that were added.
  function cleanup() {
    source.removeListener('data', ondata);
    dest.removeListener('drain', ondrain);

    source.removeListener('end', onend);
    source.removeListener('close', onclose);

    source.removeListener('error', onerror);
    dest.removeListener('error', onerror);

    source.removeListener('end', cleanup);
    source.removeListener('close', cleanup);

    dest.removeListener('close', cleanup);
  }

  source.on('end', cleanup);
  source.on('close', cleanup);

  dest.on('close', cleanup);

  dest.emit('pipe', source);

  // Allow for unix-like usage: A.pipe(B).pipe(C)
  return dest;
};

var rStates = {
  UNSENT: 0,
  OPENED: 1,
  HEADERS_RECEIVED: 2,
  LOADING: 3,
  DONE: 4
};
function IncomingMessage(xhr, response, mode) {
  var self = this;
  Readable.call(self);

  self._mode = mode;
  self.headers = {};
  self.rawHeaders = [];
  self.trailers = {};
  self.rawTrailers = [];

  // Fake the 'close' event, but only once 'end' fires
  self.on('end', function() {
    // The nextTick is necessary to prevent the 'request' module from causing an infinite loop
    browser$1.nextTick(function() {
      self.emit('close');
    });
  });
  var read;
  if (mode === 'fetch') {
    self._fetchResponse = response;

    self.url = response.url;
    self.statusCode = response.status;
    self.statusMessage = response.statusText;
      // backwards compatible version of for (<item> of <iterable>):
      // for (var <item>,_i,_it = <iterable>[Symbol.iterator](); <item> = (_i = _it.next()).value,!_i.done;)
    for (var header, _i, _it = response.headers[Symbol.iterator](); header = (_i = _it.next()).value, !_i.done;) {
      self.headers[header[0].toLowerCase()] = header[1];
      self.rawHeaders.push(header[0], header[1]);
    }

    // TODO: this doesn't respect backpressure. Once WritableStream is available, this can be fixed
    var reader = response.body.getReader();

    read = function () {
      reader.read().then(function(result) {
        if (self._destroyed)
          return
        if (result.done) {
          self.push(null);
          return
        }
        self.push(new Buffer$1(result.value));
        read();
      });
    };
    read();

  } else {
    self._xhr = xhr;
    self._pos = 0;

    self.url = xhr.responseURL;
    self.statusCode = xhr.status;
    self.statusMessage = xhr.statusText;
    var headers = xhr.getAllResponseHeaders().split(/\r?\n/);
    headers.forEach(function(header) {
      var matches = header.match(/^([^:]+):\s*(.*)/);
      if (matches) {
        var key = matches[1].toLowerCase();
        if (key === 'set-cookie') {
          if (self.headers[key] === undefined) {
            self.headers[key] = [];
          }
          self.headers[key].push(matches[2]);
        } else if (self.headers[key] !== undefined) {
          self.headers[key] += ', ' + matches[2];
        } else {
          self.headers[key] = matches[2];
        }
        self.rawHeaders.push(matches[1], matches[2]);
      }
    });

    self._charset = 'x-user-defined';
    if (!overrideMimeType) {
      var mimeType = self.rawHeaders['mime-type'];
      if (mimeType) {
        var charsetMatch = mimeType.match(/;\s*charset=([^;])(;|$)/);
        if (charsetMatch) {
          self._charset = charsetMatch[1].toLowerCase();
        }
      }
      if (!self._charset)
        self._charset = 'utf-8'; // best guess
    }
  }
}

inherits$1(IncomingMessage, Readable);

IncomingMessage.prototype._read = function() {};

IncomingMessage.prototype._onXHRProgress = function() {
  var self = this;

  var xhr = self._xhr;

  var response = null;
  switch (self._mode) {
  case 'text:vbarray': // For IE9
    if (xhr.readyState !== rStates.DONE)
      break
    try {
      // This fails in IE8
      response = new global$1.VBArray(xhr.responseBody).toArray();
    } catch (e) {
      // pass
    }
    if (response !== null) {
      self.push(new Buffer$1(response));
      break
    }
    // Falls through in IE8
  case 'text':
    try { // This will fail when readyState = 3 in IE9. Switch mode and wait for readyState = 4
      response = xhr.responseText;
    } catch (e) {
      self._mode = 'text:vbarray';
      break
    }
    if (response.length > self._pos) {
      var newData = response.substr(self._pos);
      if (self._charset === 'x-user-defined') {
        var buffer = new Buffer$1(newData.length);
        for (var i = 0; i < newData.length; i++)
          buffer[i] = newData.charCodeAt(i) & 0xff;

        self.push(buffer);
      } else {
        self.push(newData, self._charset);
      }
      self._pos = response.length;
    }
    break
  case 'arraybuffer':
    if (xhr.readyState !== rStates.DONE || !xhr.response)
      break
    response = xhr.response;
    self.push(new Buffer$1(new Uint8Array(response)));
    break
  case 'moz-chunked-arraybuffer': // take whole
    response = xhr.response;
    if (xhr.readyState !== rStates.LOADING || !response)
      break
    self.push(new Buffer$1(new Uint8Array(response)));
    break
  case 'ms-stream':
    response = xhr.response;
    if (xhr.readyState !== rStates.LOADING)
      break
    var reader = new global$1.MSStreamReader();
    reader.onprogress = function() {
      if (reader.result.byteLength > self._pos) {
        self.push(new Buffer$1(new Uint8Array(reader.result.slice(self._pos))));
        self._pos = reader.result.byteLength;
      }
    };
    reader.onload = function() {
      self.push(null);
    };
      // reader.onerror = ??? // TODO: this
    reader.readAsArrayBuffer(response);
    break
  }

  // The ms-stream case handles end separately in reader.onload()
  if (self._xhr.readyState === rStates.DONE && self._mode !== 'ms-stream') {
    self.push(null);
  }
};

// from https://github.com/jhiesey/to-arraybuffer/blob/6502d9850e70ba7935a7df4ad86b358fc216f9f0/index.js
function toArrayBuffer (buf) {
  // If the buffer is backed by a Uint8Array, a faster version will work
  if (buf instanceof Uint8Array) {
    // If the buffer isn't a subarray, return the underlying ArrayBuffer
    if (buf.byteOffset === 0 && buf.byteLength === buf.buffer.byteLength) {
      return buf.buffer
    } else if (typeof buf.buffer.slice === 'function') {
      // Otherwise we need to get a proper copy
      return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)
    }
  }

  if (isBuffer(buf)) {
    // This is the slow version that will work with any Buffer
    // implementation (even in old browsers)
    var arrayCopy = new Uint8Array(buf.length);
    var len = buf.length;
    for (var i = 0; i < len; i++) {
      arrayCopy[i] = buf[i];
    }
    return arrayCopy.buffer
  } else {
    throw new Error('Argument must be a Buffer')
  }
}

function decideMode(preferBinary, useFetch) {
  if (hasFetch && useFetch) {
    return 'fetch'
  } else if (mozchunkedarraybuffer) {
    return 'moz-chunked-arraybuffer'
  } else if (msstream) {
    return 'ms-stream'
  } else if (arraybuffer && preferBinary) {
    return 'arraybuffer'
  } else if (vbArray && preferBinary) {
    return 'text:vbarray'
  } else {
    return 'text'
  }
}

function ClientRequest(opts) {
  var self = this;
  Writable.call(self);

  self._opts = opts;
  self._body = [];
  self._headers = {};
  if (opts.auth)
    self.setHeader('Authorization', 'Basic ' + new Buffer$1(opts.auth).toString('base64'));
  Object.keys(opts.headers).forEach(function(name) {
    self.setHeader(name, opts.headers[name]);
  });

  var preferBinary;
  var useFetch = true;
  if (opts.mode === 'disable-fetch') {
    // If the use of XHR should be preferred and includes preserving the 'content-type' header
    useFetch = false;
    preferBinary = true;
  } else if (opts.mode === 'prefer-streaming') {
    // If streaming is a high priority but binary compatibility and
    // the accuracy of the 'content-type' header aren't
    preferBinary = false;
  } else if (opts.mode === 'allow-wrong-content-type') {
    // If streaming is more important than preserving the 'content-type' header
    preferBinary = !overrideMimeType;
  } else if (!opts.mode || opts.mode === 'default' || opts.mode === 'prefer-fast') {
    // Use binary if text streaming may corrupt data or the content-type header, or for speed
    preferBinary = true;
  } else {
    throw new Error('Invalid value for opts.mode')
  }
  self._mode = decideMode(preferBinary, useFetch);

  self.on('finish', function() {
    self._onFinish();
  });
}

inherits$1(ClientRequest, Writable);
// Taken from http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader%28%29-method
var unsafeHeaders = [
  'accept-charset',
  'accept-encoding',
  'access-control-request-headers',
  'access-control-request-method',
  'connection',
  'content-length',
  'cookie',
  'cookie2',
  'date',
  'dnt',
  'expect',
  'host',
  'keep-alive',
  'origin',
  'referer',
  'te',
  'trailer',
  'transfer-encoding',
  'upgrade',
  'user-agent',
  'via'
];
ClientRequest.prototype.setHeader = function(name, value) {
  var self = this;
  var lowerName = name.toLowerCase();
    // This check is not necessary, but it prevents warnings from browsers about setting unsafe
    // headers. To be honest I'm not entirely sure hiding these warnings is a good thing, but
    // http-browserify did it, so I will too.
  if (unsafeHeaders.indexOf(lowerName) !== -1)
    return

  self._headers[lowerName] = {
    name: name,
    value: value
  };
};

ClientRequest.prototype.getHeader = function(name) {
  var self = this;
  return self._headers[name.toLowerCase()].value
};

ClientRequest.prototype.removeHeader = function(name) {
  var self = this;
  delete self._headers[name.toLowerCase()];
};

ClientRequest.prototype._onFinish = function() {
  var self = this;

  if (self._destroyed)
    return
  var opts = self._opts;

  var headersObj = self._headers;
  var body;
  if (opts.method === 'POST' || opts.method === 'PUT' || opts.method === 'PATCH') {
    if (blobConstructor()) {
      body = new global$1.Blob(self._body.map(function(buffer) {
        return toArrayBuffer(buffer)
      }), {
        type: (headersObj['content-type'] || {}).value || ''
      });
    } else {
      // get utf8 string
      body = Buffer$1.concat(self._body).toString();
    }
  }

  if (self._mode === 'fetch') {
    var headers = Object.keys(headersObj).map(function(name) {
      return [headersObj[name].name, headersObj[name].value]
    });

    global$1.fetch(self._opts.url, {
      method: self._opts.method,
      headers: headers,
      body: body,
      mode: 'cors',
      credentials: opts.withCredentials ? 'include' : 'same-origin'
    }).then(function(response) {
      self._fetchResponse = response;
      self._connect();
    }, function(reason) {
      self.emit('error', reason);
    });
  } else {
    var xhr = self._xhr = new global$1.XMLHttpRequest();
    try {
      xhr.open(self._opts.method, self._opts.url, true);
    } catch (err) {
      browser$1.nextTick(function() {
        self.emit('error', err);
      });
      return
    }

    // Can't set responseType on really old browsers
    if ('responseType' in xhr)
      xhr.responseType = self._mode.split(':')[0];

    if ('withCredentials' in xhr)
      xhr.withCredentials = !!opts.withCredentials;

    if (self._mode === 'text' && 'overrideMimeType' in xhr)
      xhr.overrideMimeType('text/plain; charset=x-user-defined');

    Object.keys(headersObj).forEach(function(name) {
      xhr.setRequestHeader(headersObj[name].name, headersObj[name].value);
    });

    self._response = null;
    xhr.onreadystatechange = function() {
      switch (xhr.readyState) {
      case rStates.LOADING:
      case rStates.DONE:
        self._onXHRProgress();
        break
      }
    };
      // Necessary for streaming in Firefox, since xhr.response is ONLY defined
      // in onprogress, not in onreadystatechange with xhr.readyState = 3
    if (self._mode === 'moz-chunked-arraybuffer') {
      xhr.onprogress = function() {
        self._onXHRProgress();
      };
    }

    xhr.onerror = function() {
      if (self._destroyed)
        return
      self.emit('error', new Error('XHR error'));
    };

    try {
      xhr.send(body);
    } catch (err) {
      browser$1.nextTick(function() {
        self.emit('error', err);
      });
      return
    }
  }
};

/**
 * Checks if xhr.status is readable and non-zero, indicating no error.
 * Even though the spec says it should be available in readyState 3,
 * accessing it throws an exception in IE8
 */
function statusValid(xhr) {
  try {
    var status = xhr.status;
    return (status !== null && status !== 0)
  } catch (e) {
    return false
  }
}

ClientRequest.prototype._onXHRProgress = function() {
  var self = this;

  if (!statusValid(self._xhr) || self._destroyed)
    return

  if (!self._response)
    self._connect();

  self._response._onXHRProgress();
};

ClientRequest.prototype._connect = function() {
  var self = this;

  if (self._destroyed)
    return

  self._response = new IncomingMessage(self._xhr, self._fetchResponse, self._mode);
  self.emit('response', self._response);
};

ClientRequest.prototype._write = function(chunk, encoding, cb) {
  var self = this;

  self._body.push(chunk);
  cb();
};

ClientRequest.prototype.abort = ClientRequest.prototype.destroy = function() {
  var self = this;
  self._destroyed = true;
  if (self._response)
    self._response._destroyed = true;
  if (self._xhr)
    self._xhr.abort();
    // Currently, there isn't a way to truly abort a fetch.
    // If you like bikeshedding, see https://github.com/whatwg/fetch/issues/27
};

ClientRequest.prototype.end = function(data, encoding, cb) {
  var self = this;
  if (typeof data === 'function') {
    cb = data;
    data = undefined;
  }

  Writable.prototype.end.call(self, data, encoding, cb);
};

ClientRequest.prototype.flushHeaders = function() {};
ClientRequest.prototype.setTimeout = function() {};
ClientRequest.prototype.setNoDelay = function() {};
ClientRequest.prototype.setSocketKeepAlive = function() {};

/*! https://mths.be/punycode v1.4.1 by @mathias */


/** Highest positive signed 32-bit float value */
var maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1

/** Bootstring parameters */
var base = 36;
var tMin = 1;
var tMax = 26;
var skew = 38;
var damp = 700;
var initialBias = 72;
var initialN = 128; // 0x80
var delimiter$1 = '-'; // '\x2D'
var regexNonASCII = /[^\x20-\x7E]/; // unprintable ASCII chars + non-ASCII chars
var regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators

/** Error messages */
var errors = {
  'overflow': 'Overflow: input needs wider integers to process',
  'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
  'invalid-input': 'Invalid input'
};

/** Convenience shortcuts */
var baseMinusTMin = base - tMin;
var floor = Math.floor;
var stringFromCharCode = String.fromCharCode;

/*--------------------------------------------------------------------------*/

/**
 * A generic error utility function.
 * @private
 * @param {String} type The error type.
 * @returns {Error} Throws a `RangeError` with the applicable error message.
 */
function error(type) {
  throw new RangeError(errors[type]);
}

/**
 * A generic `Array#map` utility function.
 * @private
 * @param {Array} array The array to iterate over.
 * @param {Function} callback The function that gets called for every array
 * item.
 * @returns {Array} A new array of values returned by the callback function.
 */
function map$1(array, fn) {
  var length = array.length;
  var result = [];
  while (length--) {
    result[length] = fn(array[length]);
  }
  return result;
}

/**
 * A simple `Array#map`-like wrapper to work with domain name strings or email
 * addresses.
 * @private
 * @param {String} domain The domain name or email address.
 * @param {Function} callback The function that gets called for every
 * character.
 * @returns {Array} A new string of characters returned by the callback
 * function.
 */
function mapDomain(string, fn) {
  var parts = string.split('@');
  var result = '';
  if (parts.length > 1) {
    // In email addresses, only the domain name should be punycoded. Leave
    // the local part (i.e. everything up to `@`) intact.
    result = parts[0] + '@';
    string = parts[1];
  }
  // Avoid `split(regex)` for IE8 compatibility. See #17.
  string = string.replace(regexSeparators, '\x2E');
  var labels = string.split('.');
  var encoded = map$1(labels, fn).join('.');
  return result + encoded;
}

/**
 * Creates an array containing the numeric code points of each Unicode
 * character in the string. While JavaScript uses UCS-2 internally,
 * this function will convert a pair of surrogate halves (each of which
 * UCS-2 exposes as separate characters) into a single code point,
 * matching UTF-16.
 * @see `punycode.ucs2.encode`
 * @see <https://mathiasbynens.be/notes/javascript-encoding>
 * @memberOf punycode.ucs2
 * @name decode
 * @param {String} string The Unicode input string (UCS-2).
 * @returns {Array} The new array of code points.
 */
function ucs2decode(string) {
  var output = [],
    counter = 0,
    length = string.length,
    value,
    extra;
  while (counter < length) {
    value = string.charCodeAt(counter++);
    if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
      // high surrogate, and there is a next character
      extra = string.charCodeAt(counter++);
      if ((extra & 0xFC00) == 0xDC00) { // low surrogate
        output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
      } else {
        // unmatched surrogate; only append this code unit, in case the next
        // code unit is the high surrogate of a surrogate pair
        output.push(value);
        counter--;
      }
    } else {
      output.push(value);
    }
  }
  return output;
}

/**
 * Converts a digit/integer into a basic code point.
 * @see `basicToDigit()`
 * @private
 * @param {Number} digit The numeric value of a basic code point.
 * @returns {Number} The basic code point whose value (when used for
 * representing integers) is `digit`, which needs to be in the range
 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
 * used; else, the lowercase form is used. The behavior is undefined
 * if `flag` is non-zero and `digit` has no uppercase form.
 */
function digitToBasic(digit, flag) {
  //  0..25 map to ASCII a..z or A..Z
  // 26..35 map to ASCII 0..9
  return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
}

/**
 * Bias adaptation function as per section 3.4 of RFC 3492.
 * https://tools.ietf.org/html/rfc3492#section-3.4
 * @private
 */
function adapt(delta, numPoints, firstTime) {
  var k = 0;
  delta = firstTime ? floor(delta / damp) : delta >> 1;
  delta += floor(delta / numPoints);
  for ( /* no initialization */ ; delta > baseMinusTMin * tMax >> 1; k += base) {
    delta = floor(delta / baseMinusTMin);
  }
  return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
}

/**
 * Converts a string of Unicode symbols (e.g. a domain name label) to a
 * Punycode string of ASCII-only symbols.
 * @memberOf punycode
 * @param {String} input The string of Unicode symbols.
 * @returns {String} The resulting Punycode string of ASCII-only symbols.
 */
function encode$1(input) {
  var n,
    delta,
    handledCPCount,
    basicLength,
    bias,
    j,
    m,
    q,
    k,
    t,
    currentValue,
    output = [],
    /** `inputLength` will hold the number of code points in `input`. */
    inputLength,
    /** Cached calculation results */
    handledCPCountPlusOne,
    baseMinusT,
    qMinusT;

  // Convert the input in UCS-2 to Unicode
  input = ucs2decode(input);

  // Cache the length
  inputLength = input.length;

  // Initialize the state
  n = initialN;
  delta = 0;
  bias = initialBias;

  // Handle the basic code points
  for (j = 0; j < inputLength; ++j) {
    currentValue = input[j];
    if (currentValue < 0x80) {
      output.push(stringFromCharCode(currentValue));
    }
  }

  handledCPCount = basicLength = output.length;

  // `handledCPCount` is the number of code points that have been handled;
  // `basicLength` is the number of basic code points.

  // Finish the basic string - if it is not empty - with a delimiter
  if (basicLength) {
    output.push(delimiter$1);
  }

  // Main encoding loop:
  while (handledCPCount < inputLength) {

    // All non-basic code points < n have been handled already. Find the next
    // larger one:
    for (m = maxInt, j = 0; j < inputLength; ++j) {
      currentValue = input[j];
      if (currentValue >= n && currentValue < m) {
        m = currentValue;
      }
    }

    // Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
    // but guard against overflow
    handledCPCountPlusOne = handledCPCount + 1;
    if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
      error('overflow');
    }

    delta += (m - n) * handledCPCountPlusOne;
    n = m;

    for (j = 0; j < inputLength; ++j) {
      currentValue = input[j];

      if (currentValue < n && ++delta > maxInt) {
        error('overflow');
      }

      if (currentValue == n) {
        // Represent delta as a generalized variable-length integer
        for (q = delta, k = base; /* no condition */ ; k += base) {
          t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
          if (q < t) {
            break;
          }
          qMinusT = q - t;
          baseMinusT = base - t;
          output.push(
            stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
          );
          q = floor(qMinusT / baseMinusT);
        }

        output.push(stringFromCharCode(digitToBasic(q, 0)));
        bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
        delta = 0;
        ++handledCPCount;
      }
    }

    ++delta;
    ++n;

  }
  return output.join('');
}

/**
 * Converts a Unicode string representing a domain name or an email address to
 * Punycode. Only the non-ASCII parts of the domain name will be converted,
 * i.e. it doesn't matter if you call it with a domain that's already in
 * ASCII.
 * @memberOf punycode
 * @param {String} input The domain name or email address to convert, as a
 * Unicode string.
 * @returns {String} The Punycode representation of the given domain name or
 * email address.
 */
function toASCII(input) {
  return mapDomain(input, function(string) {
    return regexNonASCII.test(string) ?
      'xn--' + encode$1(string) :
      string;
  });
}

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.


// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
// See: https://github.com/joyent/node/issues/1707
function hasOwnProperty$1(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}
var isArray = Array.isArray || function (xs) {
  return Object.prototype.toString.call(xs) === '[object Array]';
};
function stringifyPrimitive(v) {
  switch (typeof v) {
    case 'string':
      return v;

    case 'boolean':
      return v ? 'true' : 'false';

    case 'number':
      return isFinite(v) ? v : '';

    default:
      return '';
  }
}

function stringify$1 (obj, sep, eq, name) {
  sep = sep || '&';
  eq = eq || '=';
  if (obj === null) {
    obj = undefined;
  }

  if (typeof obj === 'object') {
    return map(objectKeys(obj), function(k) {
      var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
      if (isArray(obj[k])) {
        return map(obj[k], function(v) {
          return ks + encodeURIComponent(stringifyPrimitive(v));
        }).join(sep);
      } else {
        return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
      }
    }).join(sep);

  }

  if (!name) return '';
  return encodeURIComponent(stringifyPrimitive(name)) + eq +
         encodeURIComponent(stringifyPrimitive(obj));
}
function map (xs, f) {
  if (xs.map) return xs.map(f);
  var res = [];
  for (var i = 0; i < xs.length; i++) {
    res.push(f(xs[i], i));
  }
  return res;
}

var objectKeys = Object.keys || function (obj) {
  var res = [];
  for (var key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
  }
  return res;
};

function parse$3(qs, sep, eq, options) {
  sep = sep || '&';
  eq = eq || '=';
  var obj = {};

  if (typeof qs !== 'string' || qs.length === 0) {
    return obj;
  }

  var regexp = /\+/g;
  qs = qs.split(sep);

  var maxKeys = 1000;
  if (options && typeof options.maxKeys === 'number') {
    maxKeys = options.maxKeys;
  }

  var len = qs.length;
  // maxKeys <= 0 means that we should not limit keys count
  if (maxKeys > 0 && len > maxKeys) {
    len = maxKeys;
  }

  for (var i = 0; i < len; ++i) {
    var x = qs[i].replace(regexp, '%20'),
        idx = x.indexOf(eq),
        kstr, vstr, k, v;

    if (idx >= 0) {
      kstr = x.substr(0, idx);
      vstr = x.substr(idx + 1);
    } else {
      kstr = x;
      vstr = '';
    }

    k = decodeURIComponent(kstr);
    v = decodeURIComponent(vstr);

    if (!hasOwnProperty$1(obj, k)) {
      obj[k] = v;
    } else if (isArray(obj[k])) {
      obj[k].push(v);
    } else {
      obj[k] = [obj[k], v];
    }
  }

  return obj;
}

// WHATWG API
const URL = global$1.URL;
const URLSearchParams = global$1.URLSearchParams;
var _polyfillNode_url = {
  parse: urlParse,
  resolve: urlResolve,
  resolveObject: urlResolveObject,
  fileURLToPath: urlFileURLToPath,
  format: urlFormat,
  Url: Url,

  // WHATWG API
  URL,
  URLSearchParams,  
};
function Url() {
  this.protocol = null;
  this.slashes = null;
  this.auth = null;
  this.host = null;
  this.port = null;
  this.hostname = null;
  this.hash = null;
  this.search = null;
  this.query = null;
  this.pathname = null;
  this.path = null;
  this.href = null;
}

// Reference: RFC 3986, RFC 1808, RFC 2396

// define these here so at least they only have to be
// compiled once on the first module load.
var protocolPattern = /^([a-z0-9.+-]+:)/i,
  portPattern = /:[0-9]*$/,

  // Special case for a simple path URL
  simplePathPattern = /^(\/\/?(?!\/)[^\?\s]*)(\?[^\s]*)?$/,

  // RFC 2396: characters reserved for delimiting URLs.
  // We actually just auto-escape these.
  delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],

  // RFC 2396: characters not allowed for various reasons.
  unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),

  // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
  autoEscape = ['\''].concat(unwise),
  // Characters that are never ever allowed in a hostname.
  // Note that any invalid chars are also handled, but these
  // are the ones that are *expected* to be seen, so we fast-path
  // them.
  nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
  hostEndingChars = ['/', '?', '#'],
  hostnameMaxLen = 255,
  hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,
  hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,
  // protocols that can allow "unsafe" and "unwise" chars.
  unsafeProtocol = {
    'javascript': true,
    'javascript:': true
  },
  // protocols that never have a hostname.
  hostlessProtocol = {
    'javascript': true,
    'javascript:': true
  },
  // protocols that always contain a // bit.
  slashedProtocol = {
    'http': true,
    'https': true,
    'ftp': true,
    'gopher': true,
    'file': true,
    'http:': true,
    'https:': true,
    'ftp:': true,
    'gopher:': true,
    'file:': true
  };

function urlParse(url, parseQueryString, slashesDenoteHost) {
  if (url && isObject(url) && url instanceof Url) return url;

  var u = new Url;
  u.parse(url, parseQueryString, slashesDenoteHost);
  return u;
}
Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
  return parse$2(this, url, parseQueryString, slashesDenoteHost);
};

function parse$2(self, url, parseQueryString, slashesDenoteHost) {
  if (!isString(url)) {
    throw new TypeError('Parameter \'url\' must be a string, not ' + typeof url);
  }

  // Copy chrome, IE, opera backslash-handling behavior.
  // Back slashes before the query string get converted to forward slashes
  // See: https://code.google.com/p/chromium/issues/detail?id=25916
  var queryIndex = url.indexOf('?'),
    splitter =
    (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
    uSplit = url.split(splitter),
    slashRegex = /\\/g;
  uSplit[0] = uSplit[0].replace(slashRegex, '/');
  url = uSplit.join(splitter);

  var rest = url;

  // trim before proceeding.
  // This is to support parse stuff like "  http://foo.com  \n"
  rest = rest.trim();

  if (!slashesDenoteHost && url.split('#').length === 1) {
    // Try fast path regexp
    var simplePath = simplePathPattern.exec(rest);
    if (simplePath) {
      self.path = rest;
      self.href = rest;
      self.pathname = simplePath[1];
      if (simplePath[2]) {
        self.search = simplePath[2];
        if (parseQueryString) {
          self.query = parse$3(self.search.substr(1));
        } else {
          self.query = self.search.substr(1);
        }
      } else if (parseQueryString) {
        self.search = '';
        self.query = {};
      }
      return self;
    }
  }

  var proto = protocolPattern.exec(rest);
  if (proto) {
    proto = proto[0];
    var lowerProto = proto.toLowerCase();
    self.protocol = lowerProto;
    rest = rest.substr(proto.length);
  }

  // figure out if it's got a host
  // user@server is *always* interpreted as a hostname, and url
  // resolution will treat //foo/bar as host=foo,path=bar because that's
  // how the browser resolves relative URLs.
  if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
    var slashes = rest.substr(0, 2) === '//';
    if (slashes && !(proto && hostlessProtocol[proto])) {
      rest = rest.substr(2);
      self.slashes = true;
    }
  }
  var i, hec, l, p;
  if (!hostlessProtocol[proto] &&
    (slashes || (proto && !slashedProtocol[proto]))) {

    // there's a hostname.
    // the first instance of /, ?, ;, or # ends the host.
    //
    // If there is an @ in the hostname, then non-host chars *are* allowed
    // to the left of the last @ sign, unless some host-ending character
    // comes *before* the @-sign.
    // URLs are obnoxious.
    //
    // ex:
    // http://a@b@c/ => user:a@b host:c
    // http://a@b?@c => user:a host:c path:/?@c

    // v0.12 TODO(isaacs): This is not quite how Chrome does things.
    // Review our test case against browsers more comprehensively.

    // find the first instance of any hostEndingChars
    var hostEnd = -1;
    for (i = 0; i < hostEndingChars.length; i++) {
      hec = rest.indexOf(hostEndingChars[i]);
      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
        hostEnd = hec;
    }

    // at this point, either we have an explicit point where the
    // auth portion cannot go past, or the last @ char is the decider.
    var auth, atSign;
    if (hostEnd === -1) {
      // atSign can be anywhere.
      atSign = rest.lastIndexOf('@');
    } else {
      // atSign must be in auth portion.
      // http://a@b/c@d => host:b auth:a path:/c@d
      atSign = rest.lastIndexOf('@', hostEnd);
    }

    // Now we have a portion which is definitely the auth.
    // Pull that off.
    if (atSign !== -1) {
      auth = rest.slice(0, atSign);
      rest = rest.slice(atSign + 1);
      self.auth = decodeURIComponent(auth);
    }

    // the host is the remaining to the left of the first non-host char
    hostEnd = -1;
    for (i = 0; i < nonHostChars.length; i++) {
      hec = rest.indexOf(nonHostChars[i]);
      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
        hostEnd = hec;
    }
    // if we still have not hit it, then the entire thing is a host.
    if (hostEnd === -1)
      hostEnd = rest.length;

    self.host = rest.slice(0, hostEnd);
    rest = rest.slice(hostEnd);

    // pull out port.
    parseHost$2(self);

    // we've indicated that there is a hostname,
    // so even if it's empty, it has to be present.
    self.hostname = self.hostname || '';

    // if hostname begins with [ and ends with ]
    // assume that it's an IPv6 address.
    var ipv6Hostname = self.hostname[0] === '[' &&
      self.hostname[self.hostname.length - 1] === ']';

    // validate a little.
    if (!ipv6Hostname) {
      var hostparts = self.hostname.split(/\./);
      for (i = 0, l = hostparts.length; i < l; i++) {
        var part = hostparts[i];
        if (!part) continue;
        if (!part.match(hostnamePartPattern)) {
          var newpart = '';
          for (var j = 0, k = part.length; j < k; j++) {
            if (part.charCodeAt(j) > 127) {
              // we replace non-ASCII char with a temporary placeholder
              // we need this to make sure size of hostname is not
              // broken by replacing non-ASCII by nothing
              newpart += 'x';
            } else {
              newpart += part[j];
            }
          }
          // we test again with ASCII char only
          if (!newpart.match(hostnamePartPattern)) {
            var validParts = hostparts.slice(0, i);
            var notHost = hostparts.slice(i + 1);
            var bit = part.match(hostnamePartStart);
            if (bit) {
              validParts.push(bit[1]);
              notHost.unshift(bit[2]);
            }
            if (notHost.length) {
              rest = '/' + notHost.join('.') + rest;
            }
            self.hostname = validParts.join('.');
            break;
          }
        }
      }
    }

    if (self.hostname.length > hostnameMaxLen) {
      self.hostname = '';
    } else {
      // hostnames are always lower case.
      self.hostname = self.hostname.toLowerCase();
    }

    if (!ipv6Hostname) {
      // IDNA Support: Returns a punycoded representation of "domain".
      // It only converts parts of the domain name that
      // have non-ASCII characters, i.e. it doesn't matter if
      // you call it with a domain that already is ASCII-only.
      self.hostname = toASCII(self.hostname);
    }

    p = self.port ? ':' + self.port : '';
    var h = self.hostname || '';
    self.host = h + p;
    self.href += self.host;

    // strip [ and ] from the hostname
    // the host field still retains them, though
    if (ipv6Hostname) {
      self.hostname = self.hostname.substr(1, self.hostname.length - 2);
      if (rest[0] !== '/') {
        rest = '/' + rest;
      }
    }
  }

  // now rest is set to the post-host stuff.
  // chop off any delim chars.
  if (!unsafeProtocol[lowerProto]) {

    // First, make 100% sure that any "autoEscape" chars get
    // escaped, even if encodeURIComponent doesn't think they
    // need to be.
    for (i = 0, l = autoEscape.length; i < l; i++) {
      var ae = autoEscape[i];
      if (rest.indexOf(ae) === -1)
        continue;
      var esc = encodeURIComponent(ae);
      if (esc === ae) {
        esc = escape(ae);
      }
      rest = rest.split(ae).join(esc);
    }
  }


  // chop off from the tail first.
  var hash = rest.indexOf('#');
  if (hash !== -1) {
    // got a fragment string.
    self.hash = rest.substr(hash);
    rest = rest.slice(0, hash);
  }
  var qm = rest.indexOf('?');
  if (qm !== -1) {
    self.search = rest.substr(qm);
    self.query = rest.substr(qm + 1);
    if (parseQueryString) {
      self.query = parse$3(self.query);
    }
    rest = rest.slice(0, qm);
  } else if (parseQueryString) {
    // no query string, but parseQueryString still requested
    self.search = '';
    self.query = {};
  }
  if (rest) self.pathname = rest;
  if (slashedProtocol[lowerProto] &&
    self.hostname && !self.pathname) {
    self.pathname = '/';
  }

  //to support http.request
  if (self.pathname || self.search) {
    p = self.pathname || '';
    var s = self.search || '';
    self.path = p + s;
  }

  // finally, reconstruct the href based on what has been validated.
  self.href = format$1(self);
  return self;
}

function urlFileURLToPath(path) {
  if (typeof path === 'string')
    path = new Url().parse(path);
  else if (!(path instanceof Url))
    throw new TypeError('The "path" argument must be of type string or an instance of URL. Received type ' + (typeof path) + String(path));
  if (path.protocol !== 'file:')
    throw new TypeError('The URL must be of scheme file');
  return getPathFromURLPosix(path);
}

function getPathFromURLPosix(url) {
  const pathname = url.pathname;
  for (let n = 0; n < pathname.length; n++) {
    if (pathname[n] === '%') {
      const third = pathname.codePointAt(n + 2) | 0x20;
      if (pathname[n + 1] === '2' && third === 102) {
        throw new TypeError(
          'must not include encoded / characters'
        );
      }
    }
  }
  return decodeURIComponent(pathname);
}

// format a parsed object into a url string
function urlFormat(obj) {
  // ensure it's an object, and not a string url.
  // If it's an obj, this is a no-op.
  // this way, you can call url_format() on strings
  // to clean up potentially wonky urls.
  if (isString(obj)) obj = parse$2({}, obj);
  return format$1(obj);
}

function format$1(self) {
  var auth = self.auth || '';
  if (auth) {
    auth = encodeURIComponent(auth);
    auth = auth.replace(/%3A/i, ':');
    auth += '@';
  }

  var protocol = self.protocol || '',
    pathname = self.pathname || '',
    hash = self.hash || '',
    host = false,
    query = '';

  if (self.host) {
    host = auth + self.host;
  } else if (self.hostname) {
    host = auth + (self.hostname.indexOf(':') === -1 ?
      self.hostname :
      '[' + this.hostname + ']');
    if (self.port) {
      host += ':' + self.port;
    }
  }

  if (self.query &&
    isObject(self.query) &&
    Object.keys(self.query).length) {
    query = stringify$1(self.query);
  }

  var search = self.search || (query && ('?' + query)) || '';

  if (protocol && protocol.substr(-1) !== ':') protocol += ':';

  // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
  // unless they had them to begin with.
  if (self.slashes ||
    (!protocol || slashedProtocol[protocol]) && host !== false) {
    host = '//' + (host || '');
    if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
  } else if (!host) {
    host = '';
  }

  if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
  if (search && search.charAt(0) !== '?') search = '?' + search;

  pathname = pathname.replace(/[?#]/g, function(match) {
    return encodeURIComponent(match);
  });
  search = search.replace('#', '%23');

  return protocol + host + pathname + search + hash;
}

Url.prototype.format = function() {
  return format$1(this);
};

function urlResolve(source, relative) {
  return urlParse(source, false, true).resolve(relative);
}

Url.prototype.resolve = function(relative) {
  return this.resolveObject(urlParse(relative, false, true)).format();
};

function urlResolveObject(source, relative) {
  if (!source) return relative;
  return urlParse(source, false, true).resolveObject(relative);
}

Url.prototype.resolveObject = function(relative) {
  if (isString(relative)) {
    var rel = new Url();
    rel.parse(relative, false, true);
    relative = rel;
  }

  var result = new Url();
  var tkeys = Object.keys(this);
  for (var tk = 0; tk < tkeys.length; tk++) {
    var tkey = tkeys[tk];
    result[tkey] = this[tkey];
  }

  // hash is always overridden, no matter what.
  // even href="" will remove it.
  result.hash = relative.hash;

  // if the relative url is empty, then there's nothing left to do here.
  if (relative.href === '') {
    result.href = result.format();
    return result;
  }

  // hrefs like //foo/bar always cut to the protocol.
  if (relative.slashes && !relative.protocol) {
    // take everything except the protocol from relative
    var rkeys = Object.keys(relative);
    for (var rk = 0; rk < rkeys.length; rk++) {
      var rkey = rkeys[rk];
      if (rkey !== 'protocol')
        result[rkey] = relative[rkey];
    }

    //urlParse appends trailing / to urls like http://www.example.com
    if (slashedProtocol[result.protocol] &&
      result.hostname && !result.pathname) {
      result.path = result.pathname = '/';
    }

    result.href = result.format();
    return result;
  }
  var relPath;
  if (relative.protocol && relative.protocol !== result.protocol) {
    // if it's a known url protocol, then changing
    // the protocol does weird things
    // first, if it's not file:, then we MUST have a host,
    // and if there was a path
    // to begin with, then we MUST have a path.
    // if it is file:, then the host is dropped,
    // because that's known to be hostless.
    // anything else is assumed to be absolute.
    if (!slashedProtocol[relative.protocol]) {
      var keys = Object.keys(relative);
      for (var v = 0; v < keys.length; v++) {
        var k = keys[v];
        result[k] = relative[k];
      }
      result.href = result.format();
      return result;
    }

    result.protocol = relative.protocol;
    if (!relative.host && !hostlessProtocol[relative.protocol]) {
      relPath = (relative.pathname || '').split('/');
      while (relPath.length && !(relative.host = relPath.shift()));
      if (!relative.host) relative.host = '';
      if (!relative.hostname) relative.hostname = '';
      if (relPath[0] !== '') relPath.unshift('');
      if (relPath.length < 2) relPath.unshift('');
      result.pathname = relPath.join('/');
    } else {
      result.pathname = relative.pathname;
    }
    result.search = relative.search;
    result.query = relative.query;
    result.host = relative.host || '';
    result.auth = relative.auth;
    result.hostname = relative.hostname || relative.host;
    result.port = relative.port;
    // to support http.request
    if (result.pathname || result.search) {
      var p = result.pathname || '';
      var s = result.search || '';
      result.path = p + s;
    }
    result.slashes = result.slashes || relative.slashes;
    result.href = result.format();
    return result;
  }

  var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
    isRelAbs = (
      relative.host ||
      relative.pathname && relative.pathname.charAt(0) === '/'
    ),
    mustEndAbs = (isRelAbs || isSourceAbs ||
      (result.host && relative.pathname)),
    removeAllDots = mustEndAbs,
    srcPath = result.pathname && result.pathname.split('/') || [],
    psychotic = result.protocol && !slashedProtocol[result.protocol];
  relPath = relative.pathname && relative.pathname.split('/') || [];
  // if the url is a non-slashed url, then relative
  // links like ../.. should be able
  // to crawl up to the hostname, as well.  This is strange.
  // result.protocol has already been set by now.
  // Later on, put the first path part into the host field.
  if (psychotic) {
    result.hostname = '';
    result.port = null;
    if (result.host) {
      if (srcPath[0] === '') srcPath[0] = result.host;
      else srcPath.unshift(result.host);
    }
    result.host = '';
    if (relative.protocol) {
      relative.hostname = null;
      relative.port = null;
      if (relative.host) {
        if (relPath[0] === '') relPath[0] = relative.host;
        else relPath.unshift(relative.host);
      }
      relative.host = null;
    }
    mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
  }
  var authInHost;
  if (isRelAbs) {
    // it's absolute.
    result.host = (relative.host || relative.host === '') ?
      relative.host : result.host;
    result.hostname = (relative.hostname || relative.hostname === '') ?
      relative.hostname : result.hostname;
    result.search = relative.search;
    result.query = relative.query;
    srcPath = relPath;
    // fall through to the dot-handling below.
  } else if (relPath.length) {
    // it's relative
    // throw away the existing file, and take the new path instead.
    if (!srcPath) srcPath = [];
    srcPath.pop();
    srcPath = srcPath.concat(relPath);
    result.search = relative.search;
    result.query = relative.query;
  } else if (!isNullOrUndefined(relative.search)) {
    // just pull out the search.
    // like href='?foo'.
    // Put this after the other two cases because it simplifies the booleans
    if (psychotic) {
      result.hostname = result.host = srcPath.shift();
      //occationaly the auth can get stuck only in host
      //this especially happens in cases like
      //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
      authInHost = result.host && result.host.indexOf('@') > 0 ?
        result.host.split('@') : false;
      if (authInHost) {
        result.auth = authInHost.shift();
        result.host = result.hostname = authInHost.shift();
      }
    }
    result.search = relative.search;
    result.query = relative.query;
    //to support http.request
    if (!isNull(result.pathname) || !isNull(result.search)) {
      result.path = (result.pathname ? result.pathname : '') +
        (result.search ? result.search : '');
    }
    result.href = result.format();
    return result;
  }

  if (!srcPath.length) {
    // no path at all.  easy.
    // we've already handled the other stuff above.
    result.pathname = null;
    //to support http.request
    if (result.search) {
      result.path = '/' + result.search;
    } else {
      result.path = null;
    }
    result.href = result.format();
    return result;
  }

  // if a url ENDs in . or .., then it must get a trailing slash.
  // however, if it ends in anything else non-slashy,
  // then it must NOT get a trailing slash.
  var last = srcPath.slice(-1)[0];
  var hasTrailingSlash = (
    (result.host || relative.host || srcPath.length > 1) &&
    (last === '.' || last === '..') || last === '');

  // strip single dots, resolve double dots to parent dir
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = srcPath.length; i >= 0; i--) {
    last = srcPath[i];
    if (last === '.') {
      srcPath.splice(i, 1);
    } else if (last === '..') {
      srcPath.splice(i, 1);
      up++;
    } else if (up) {
      srcPath.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (!mustEndAbs && !removeAllDots) {
    for (; up--; up) {
      srcPath.unshift('..');
    }
  }

  if (mustEndAbs && srcPath[0] !== '' &&
    (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
    srcPath.unshift('');
  }

  if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
    srcPath.push('');
  }

  var isAbsolute = srcPath[0] === '' ||
    (srcPath[0] && srcPath[0].charAt(0) === '/');

  // put the host back
  if (psychotic) {
    result.hostname = result.host = isAbsolute ? '' :
      srcPath.length ? srcPath.shift() : '';
    //occationaly the auth can get stuck only in host
    //this especially happens in cases like
    //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
    authInHost = result.host && result.host.indexOf('@') > 0 ?
      result.host.split('@') : false;
    if (authInHost) {
      result.auth = authInHost.shift();
      result.host = result.hostname = authInHost.shift();
    }
  }

  mustEndAbs = mustEndAbs || (result.host && srcPath.length);

  if (mustEndAbs && !isAbsolute) {
    srcPath.unshift('');
  }

  if (!srcPath.length) {
    result.pathname = null;
    result.path = null;
  } else {
    result.pathname = srcPath.join('/');
  }

  //to support request.http
  if (!isNull(result.pathname) || !isNull(result.search)) {
    result.path = (result.pathname ? result.pathname : '') +
      (result.search ? result.search : '');
  }
  result.auth = relative.auth || result.auth;
  result.slashes = result.slashes || relative.slashes;
  result.href = result.format();
  return result;
};

Url.prototype.parseHost = function() {
  return parseHost$2(this);
};

function parseHost$2(self) {
  var host = self.host;
  var port = portPattern.exec(host);
  if (port) {
    port = port[0];
    if (port !== ':') {
      self.port = port.substr(1);
    }
    host = host.substr(0, host.length - port.length);
  }
  if (host) self.hostname = host;
}

var _polyfillNode_url$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	parse: urlParse,
	resolve: urlResolve,
	resolveObject: urlResolveObject,
	fileURLToPath: urlFileURLToPath,
	format: urlFormat,
	URL: URL,
	URLSearchParams: URLSearchParams,
	default: _polyfillNode_url,
	Url: Url
});

function request$1(opts, cb) {
  if (typeof opts === 'string')
    opts = urlParse(opts);


  // Normally, the page is loaded from http or https, so not specifying a protocol
  // will result in a (valid) protocol-relative url. However, this won't work if
  // the protocol is something else, like 'file:'
  var defaultProtocol = global$1.location.protocol.search(/^https?:$/) === -1 ? 'http:' : '';

  var protocol = opts.protocol || defaultProtocol;
  var host = opts.hostname || opts.host;
  var port = opts.port;
  var path = opts.path || '/';

  // Necessary for IPv6 addresses
  if (host && host.indexOf(':') !== -1)
    host = '[' + host + ']';

  // This may be a relative url. The browser should always be able to interpret it correctly.
  opts.url = (host ? (protocol + '//' + host) : '') + (port ? ':' + port : '') + path;
  opts.method = (opts.method || 'GET').toUpperCase();
  opts.headers = opts.headers || {};

  // Also valid opts.auth, opts.mode

  var req = new ClientRequest(opts);
  if (cb)
    req.on('response', cb);
  return req
}

function get$2(opts, cb) {
  var req = request$1(opts, cb);
  req.end();
  return req
}

function Agent$1() {}
Agent$1.defaultMaxSockets = 4;

var METHODS$1 = [
  'CHECKOUT',
  'CONNECT',
  'COPY',
  'DELETE',
  'GET',
  'HEAD',
  'LOCK',
  'M-SEARCH',
  'MERGE',
  'MKACTIVITY',
  'MKCOL',
  'MOVE',
  'NOTIFY',
  'OPTIONS',
  'PATCH',
  'POST',
  'PROPFIND',
  'PROPPATCH',
  'PURGE',
  'PUT',
  'REPORT',
  'SEARCH',
  'SUBSCRIBE',
  'TRACE',
  'UNLOCK',
  'UNSUBSCRIBE'
];
var STATUS_CODES$1 = {
  100: 'Continue',
  101: 'Switching Protocols',
  102: 'Processing', // RFC 2518, obsoleted by RFC 4918
  200: 'OK',
  201: 'Created',
  202: 'Accepted',
  203: 'Non-Authoritative Information',
  204: 'No Content',
  205: 'Reset Content',
  206: 'Partial Content',
  207: 'Multi-Status', // RFC 4918
  300: 'Multiple Choices',
  301: 'Moved Permanently',
  302: 'Moved Temporarily',
  303: 'See Other',
  304: 'Not Modified',
  305: 'Use Proxy',
  307: 'Temporary Redirect',
  400: 'Bad Request',
  401: 'Unauthorized',
  402: 'Payment Required',
  403: 'Forbidden',
  404: 'Not Found',
  405: 'Method Not Allowed',
  406: 'Not Acceptable',
  407: 'Proxy Authentication Required',
  408: 'Request Time-out',
  409: 'Conflict',
  410: 'Gone',
  411: 'Length Required',
  412: 'Precondition Failed',
  413: 'Request Entity Too Large',
  414: 'Request-URI Too Large',
  415: 'Unsupported Media Type',
  416: 'Requested Range Not Satisfiable',
  417: 'Expectation Failed',
  418: 'I\'m a teapot', // RFC 2324
  422: 'Unprocessable Entity', // RFC 4918
  423: 'Locked', // RFC 4918
  424: 'Failed Dependency', // RFC 4918
  425: 'Unordered Collection', // RFC 4918
  426: 'Upgrade Required', // RFC 2817
  428: 'Precondition Required', // RFC 6585
  429: 'Too Many Requests', // RFC 6585
  431: 'Request Header Fields Too Large', // RFC 6585
  500: 'Internal Server Error',
  501: 'Not Implemented',
  502: 'Bad Gateway',
  503: 'Service Unavailable',
  504: 'Gateway Time-out',
  505: 'HTTP Version Not Supported',
  506: 'Variant Also Negotiates', // RFC 2295
  507: 'Insufficient Storage', // RFC 4918
  509: 'Bandwidth Limit Exceeded',
  510: 'Not Extended', // RFC 2774
  511: 'Network Authentication Required' // RFC 6585
};

var _polyfillNode_http = {
  request: request$1,
  get: get$2,
  Agent: Agent$1,
  METHODS: METHODS$1,
  STATUS_CODES: STATUS_CODES$1
};

var _polyfillNode_http$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	request: request$1,
	get: get$2,
	Agent: Agent$1,
	METHODS: METHODS$1,
	STATUS_CODES: STATUS_CODES$1,
	default: _polyfillNode_http
});

var require$$0$2 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_http$1);

function request(opts, cb) {
  if (typeof opts === 'string')
    opts = urlParse(opts);


  // Normally, the page is loaded from http or https, so not specifying a protocol
  // will result in a (valid) protocol-relative url. However, this won't work if
  // the protocol is something else, like 'file:'
  var defaultProtocol = global$1.location.protocol.search(/^https?:$/) === -1 ? 'http:' : '';

  var protocol = opts.protocol || defaultProtocol;
  var host = opts.hostname || opts.host;
  var port = opts.port;
  var path = opts.path || '/';

  // Necessary for IPv6 addresses
  if (host && host.indexOf(':') !== -1)
    host = '[' + host + ']';

  // This may be a relative url. The browser should always be able to interpret it correctly.
  opts.url = (host ? (protocol + '//' + host) : '') + (port ? ':' + port : '') + path;
  opts.method = (opts.method || 'GET').toUpperCase();
  opts.headers = opts.headers || {};

  // Also valid opts.auth, opts.mode

  var req = new ClientRequest(opts);
  if (cb)
    req.on('response', cb);
  return req
}

function get$1(opts, cb) {
  var req = request(opts, cb);
  req.end();
  return req
}

function Agent() {}
Agent.defaultMaxSockets = 4;

var METHODS = [
  'CHECKOUT',
  'CONNECT',
  'COPY',
  'DELETE',
  'GET',
  'HEAD',
  'LOCK',
  'M-SEARCH',
  'MERGE',
  'MKACTIVITY',
  'MKCOL',
  'MOVE',
  'NOTIFY',
  'OPTIONS',
  'PATCH',
  'POST',
  'PROPFIND',
  'PROPPATCH',
  'PURGE',
  'PUT',
  'REPORT',
  'SEARCH',
  'SUBSCRIBE',
  'TRACE',
  'UNLOCK',
  'UNSUBSCRIBE'
];
var STATUS_CODES = {
  100: 'Continue',
  101: 'Switching Protocols',
  102: 'Processing', // RFC 2518, obsoleted by RFC 4918
  200: 'OK',
  201: 'Created',
  202: 'Accepted',
  203: 'Non-Authoritative Information',
  204: 'No Content',
  205: 'Reset Content',
  206: 'Partial Content',
  207: 'Multi-Status', // RFC 4918
  300: 'Multiple Choices',
  301: 'Moved Permanently',
  302: 'Moved Temporarily',
  303: 'See Other',
  304: 'Not Modified',
  305: 'Use Proxy',
  307: 'Temporary Redirect',
  400: 'Bad Request',
  401: 'Unauthorized',
  402: 'Payment Required',
  403: 'Forbidden',
  404: 'Not Found',
  405: 'Method Not Allowed',
  406: 'Not Acceptable',
  407: 'Proxy Authentication Required',
  408: 'Request Time-out',
  409: 'Conflict',
  410: 'Gone',
  411: 'Length Required',
  412: 'Precondition Failed',
  413: 'Request Entity Too Large',
  414: 'Request-URI Too Large',
  415: 'Unsupported Media Type',
  416: 'Requested Range Not Satisfiable',
  417: 'Expectation Failed',
  418: 'I\'m a teapot', // RFC 2324
  422: 'Unprocessable Entity', // RFC 4918
  423: 'Locked', // RFC 4918
  424: 'Failed Dependency', // RFC 4918
  425: 'Unordered Collection', // RFC 4918
  426: 'Upgrade Required', // RFC 2817
  428: 'Precondition Required', // RFC 6585
  429: 'Too Many Requests', // RFC 6585
  431: 'Request Header Fields Too Large', // RFC 6585
  500: 'Internal Server Error',
  501: 'Not Implemented',
  502: 'Bad Gateway',
  503: 'Service Unavailable',
  504: 'Gateway Time-out',
  505: 'HTTP Version Not Supported',
  506: 'Variant Also Negotiates', // RFC 2295
  507: 'Insufficient Storage', // RFC 4918
  509: 'Bandwidth Limit Exceeded',
  510: 'Not Extended', // RFC 2774
  511: 'Network Authentication Required' // RFC 6585
};

var _polyfillNode_https = {
  request,
  get: get$1,
  Agent,
  METHODS,
  STATUS_CODES
};

var _polyfillNode_https$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	request: request,
	get: get$1,
	Agent: Agent,
	METHODS: METHODS,
	STATUS_CODES: STATUS_CODES,
	default: _polyfillNode_https
});

var require$$1$1 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_https$1);

var require$$0$1 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_url$1);

var HTTP_RESOURCE_PATTERN = /^http:\/\//;

function isHttpResource$1(uri) {
  return HTTP_RESOURCE_PATTERN.test(uri);
}

var isHttpResource_1 = isHttpResource$1;

var HTTPS_RESOURCE_PATTERN = /^https:\/\//;

function isHttpsResource$1(uri) {
  return HTTPS_RESOURCE_PATTERN.test(uri);
}

var isHttpsResource_1 = isHttpsResource$1;

var http = require$$0$2;
var https = require$$1$1;
var url$4 = require$$0$1;

var isHttpResource = isHttpResource_1;
var isHttpsResource = isHttpsResource_1;
var override$1 = override_1;

var HTTP_PROTOCOL$1 = 'http:';

function loadRemoteResource$1(uri, inlineRequest, inlineTimeout, callback) {
  var proxyProtocol = inlineRequest.protocol || inlineRequest.hostname;
  var errorHandled = false;
  var requestOptions;
  var fetch;

  requestOptions = override$1(
    url$4.parse(uri),
    inlineRequest || {}
  );

  if (inlineRequest.hostname !== undefined) {
    // overwrite as we always expect a http proxy currently
    requestOptions.protocol = inlineRequest.protocol || HTTP_PROTOCOL$1;
    requestOptions.path = requestOptions.href;
  }

  fetch = (proxyProtocol && !isHttpsResource(proxyProtocol)) || isHttpResource(uri) ?
    http.get :
    https.get;

  fetch(requestOptions, function (res) {
    var chunks = [];
    var movedUri;

    if (errorHandled) {
      return;
    }

    if (res.statusCode < 200 || res.statusCode > 399) {
      return callback(res.statusCode, null);
    } else if (res.statusCode > 299) {
      movedUri = url$4.resolve(uri, res.headers.location);
      return loadRemoteResource$1(movedUri, inlineRequest, inlineTimeout, callback);
    }

    res.on('data', function (chunk) {
      chunks.push(chunk.toString());
    });
    res.on('end', function () {
      var body = chunks.join('');
      callback(null, body);
    });
  })
  .on('error', function (res) {
    if (errorHandled) {
      return;
    }

    errorHandled = true;
    callback(res.message, null);
  })
  .on('timeout', function () {
    if (errorHandled) {
      return;
    }

    errorHandled = true;
    callback('timeout', null);
  })
  .setTimeout(inlineTimeout);
}

var loadRemoteResource_1 = loadRemoteResource$1;

var loadRemoteResource = loadRemoteResource_1;

function fetchFrom$1(callback) {
  return callback || loadRemoteResource;
}

var fetch = fetchFrom$1;

function inlineOptionsFrom(rules) {
  if (Array.isArray(rules)) {
    return rules;
  }

  if (rules === false) {
    return ['none'];
  }

  return undefined === rules ?
    ['local'] :
    rules.split(',');
}

var inline$2 = inlineOptionsFrom;

var url$3 = require$$0$1;

var override = override_1;

function inlineRequestFrom$1(option) {
  return override(
    /* jshint camelcase: false */
    proxyOptionsFrom(browser$1.env.HTTP_PROXY || browser$1.env.http_proxy),
    option || {}
  );
}

function proxyOptionsFrom(httpProxy) {
  return httpProxy ?
    {
      hostname: url$3.parse(httpProxy).hostname,
      port: parseInt(url$3.parse(httpProxy).port)
    } :
    {};
}

var inlineRequest = inlineRequestFrom$1;

var DEFAULT_TIMEOUT = 5000;

function inlineTimeoutFrom$1(option) {
  return option || DEFAULT_TIMEOUT;
}

var inlineTimeout = inlineTimeoutFrom$1;

function pluginsFrom$1(plugins) {
  var flatPlugins = {
    level1Value: [],
    level1Property: [],
    level2Block: []
  };

  plugins = plugins || [];

  flatPlugins.level1Value = plugins
    .map(function (plugin) { return plugin.level1 && plugin.level1.value; })
    .filter(function (plugin) { return plugin != null; });

  flatPlugins.level1Property = plugins
    .map(function (plugin) { return plugin.level1 && plugin.level1.property; })
    .filter(function (plugin) { return plugin != null; });

  flatPlugins.level2Block = plugins
    .map(function (plugin) { return plugin.level2 && plugin.level2.block; })
    .filter(function (plugin) { return plugin != null; });

  return flatPlugins;
}

var plugins = pluginsFrom$1;

function rebaseFrom$1(rebaseOption, rebaseToOption) {
  if (undefined !== rebaseToOption) {
    return true;
  } else if (undefined === rebaseOption) {
    return false;
  } else {
    return !!rebaseOption;
  }
}

var rebase$3 = rebaseFrom$1;

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = parts.length - 1; i >= 0; i--) {
    var last = parts[i];
    if (last === '.') {
      parts.splice(i, 1);
    } else if (last === '..') {
      parts.splice(i, 1);
      up++;
    } else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}

// Split a filename into [root, dir, basename, ext], unix version
// 'root' is just a slash, or nothing.
var splitPathRe =
    /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
var splitPath$1 = function(filename) {
  return splitPathRe.exec(filename).slice(1);
};

// path.resolve([from ...], to)
// posix version
function resolve$2() {
  var resolvedPath = '',
      resolvedAbsolute = false;

  for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
    var path = (i >= 0) ? arguments[i] : '/';

    // Skip empty and invalid entries
    if (typeof path !== 'string') {
      throw new TypeError('Arguments to path.resolve must be strings');
    } else if (!path) {
      continue;
    }

    resolvedPath = path + '/' + resolvedPath;
    resolvedAbsolute = path.charAt(0) === '/';
  }

  // At this point the path should be resolved to a full absolute path, but
  // handle relative paths to be safe (might happen when process.cwd() fails)

  // Normalize the path
  resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
    return !!p;
  }), !resolvedAbsolute).join('/');

  return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
}
// path.normalize(path)
// posix version
function normalize$1(path) {
  var isPathAbsolute = isAbsolute$1(path),
      trailingSlash = substr(path, -1) === '/';

  // Normalize the path
  path = normalizeArray(filter(path.split('/'), function(p) {
    return !!p;
  }), !isPathAbsolute).join('/');

  if (!path && !isPathAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isPathAbsolute ? '/' : '') + path;
}
// posix version
function isAbsolute$1(path) {
  return path.charAt(0) === '/';
}

// posix version
function join() {
  var paths = Array.prototype.slice.call(arguments, 0);
  return normalize$1(filter(paths, function(p, index) {
    if (typeof p !== 'string') {
      throw new TypeError('Arguments to path.join must be strings');
    }
    return p;
  }).join('/'));
}


// path.relative(from, to)
// posix version
function relative$1(from, to) {
  from = resolve$2(from).substr(1);
  to = resolve$2(to).substr(1);

  function trim(arr) {
    var start = 0;
    for (; start < arr.length; start++) {
      if (arr[start] !== '') break;
    }

    var end = arr.length - 1;
    for (; end >= 0; end--) {
      if (arr[end] !== '') break;
    }

    if (start > end) return [];
    return arr.slice(start, end - start + 1);
  }

  var fromParts = trim(from.split('/'));
  var toParts = trim(to.split('/'));

  var length = Math.min(fromParts.length, toParts.length);
  var samePartsLength = length;
  for (var i = 0; i < length; i++) {
    if (fromParts[i] !== toParts[i]) {
      samePartsLength = i;
      break;
    }
  }

  var outputParts = [];
  for (var i = samePartsLength; i < fromParts.length; i++) {
    outputParts.push('..');
  }

  outputParts = outputParts.concat(toParts.slice(samePartsLength));

  return outputParts.join('/');
}

var sep = '/';
var delimiter = ':';

function dirname(path) {
  var result = splitPath$1(path),
      root = result[0],
      dir = result[1];

  if (!root && !dir) {
    // No dirname whatsoever
    return '.';
  }

  if (dir) {
    // It has a dirname, strip trailing slash
    dir = dir.substr(0, dir.length - 1);
  }

  return root + dir;
}

function basename(path, ext) {
  var f = splitPath$1(path)[2];
  // TODO: make this comparison case-insensitive on windows?
  if (ext && f.substr(-1 * ext.length) === ext) {
    f = f.substr(0, f.length - ext.length);
  }
  return f;
}


function extname(path) {
  return splitPath$1(path)[3];
}
var _polyfillNode_path = {
  extname: extname,
  basename: basename,
  dirname: dirname,
  sep: sep,
  delimiter: delimiter,
  relative: relative$1,
  join: join,
  isAbsolute: isAbsolute$1,
  normalize: normalize$1,
  resolve: resolve$2
};
function filter (xs, f) {
    if (xs.filter) return xs.filter(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
        if (f(xs[i], i, xs)) res.push(xs[i]);
    }
    return res;
}

// String.prototype.substr - negative index don't work in IE8
var substr = 'ab'.substr(-1) === 'b' ?
    function (str, start, len) { return str.substr(start, len) } :
    function (str, start, len) {
        if (start < 0) start = str.length + start;
        return str.substr(start, len);
    }
;

var _polyfillNode_path$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	resolve: resolve$2,
	normalize: normalize$1,
	isAbsolute: isAbsolute$1,
	join: join,
	relative: relative$1,
	sep: sep,
	delimiter: delimiter,
	dirname: dirname,
	basename: basename,
	extname: extname,
	default: _polyfillNode_path
});

var require$$1 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_path$1);

var path$9 = require$$1;

function rebaseToFrom$1(option) {
  return option ? path$9.resolve(option) : browser$1.cwd();
}

var rebaseTo = rebaseToFrom$1;

var sourceMap = {};

var sourceMapGenerator = {};

var base64Vlq = {};

var base64$1 = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var intToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');

/**
 * Encode an integer in the range of 0 to 63 to a single base 64 digit.
 */
base64$1.encode = function (number) {
  if (0 <= number && number < intToCharMap.length) {
    return intToCharMap[number];
  }
  throw new TypeError("Must be between 0 and 63: " + number);
};

/**
 * Decode a single base 64 character code digit to an integer. Returns -1 on
 * failure.
 */
base64$1.decode = function (charCode) {
  var bigA = 65;     // 'A'
  var bigZ = 90;     // 'Z'

  var littleA = 97;  // 'a'
  var littleZ = 122; // 'z'

  var zero = 48;     // '0'
  var nine = 57;     // '9'

  var plus = 43;     // '+'
  var slash = 47;    // '/'

  var littleOffset = 26;
  var numberOffset = 52;

  // 0 - 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
  if (bigA <= charCode && charCode <= bigZ) {
    return (charCode - bigA);
  }

  // 26 - 51: abcdefghijklmnopqrstuvwxyz
  if (littleA <= charCode && charCode <= littleZ) {
    return (charCode - littleA + littleOffset);
  }

  // 52 - 61: 0123456789
  if (zero <= charCode && charCode <= nine) {
    return (charCode - zero + numberOffset);
  }

  // 62: +
  if (charCode == plus) {
    return 62;
  }

  // 63: /
  if (charCode == slash) {
    return 63;
  }

  // Invalid base64 digit.
  return -1;
};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * Based on the Base 64 VLQ implementation in Closure Compiler:
 * https://code.google.com/p/closure-compiler/source/browse/trunk/src/com/google/debugging/sourcemap/Base64VLQ.java
 *
 * Copyright 2011 The Closure Compiler Authors. All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *  * Neither the name of Google Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

var base64 = base64$1;

// A single base 64 digit can contain 6 bits of data. For the base 64 variable
// length quantities we use in the source map spec, the first bit is the sign,
// the next four bits are the actual value, and the 6th bit is the
// continuation bit. The continuation bit tells us whether there are more
// digits in this value following this digit.
//
//   Continuation
//   |    Sign
//   |    |
//   V    V
//   101011

var VLQ_BASE_SHIFT = 5;

// binary: 100000
var VLQ_BASE = 1 << VLQ_BASE_SHIFT;

// binary: 011111
var VLQ_BASE_MASK = VLQ_BASE - 1;

// binary: 100000
var VLQ_CONTINUATION_BIT = VLQ_BASE;

/**
 * Converts from a two-complement value to a value where the sign bit is
 * placed in the least significant bit.  For example, as decimals:
 *   1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
 *   2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
 */
function toVLQSigned(aValue) {
  return aValue < 0
    ? ((-aValue) << 1) + 1
    : (aValue << 1) + 0;
}

/**
 * Converts to a two-complement value from a value where the sign bit is
 * placed in the least significant bit.  For example, as decimals:
 *   2 (10 binary) becomes 1, 3 (11 binary) becomes -1
 *   4 (100 binary) becomes 2, 5 (101 binary) becomes -2
 */
function fromVLQSigned(aValue) {
  var isNegative = (aValue & 1) === 1;
  var shifted = aValue >> 1;
  return isNegative
    ? -shifted
    : shifted;
}

/**
 * Returns the base 64 VLQ encoded value.
 */
base64Vlq.encode = function base64VLQ_encode(aValue) {
  var encoded = "";
  var digit;

  var vlq = toVLQSigned(aValue);

  do {
    digit = vlq & VLQ_BASE_MASK;
    vlq >>>= VLQ_BASE_SHIFT;
    if (vlq > 0) {
      // There are still more digits in this value, so we must make sure the
      // continuation bit is marked.
      digit |= VLQ_CONTINUATION_BIT;
    }
    encoded += base64.encode(digit);
  } while (vlq > 0);

  return encoded;
};

/**
 * Decodes the next base 64 VLQ value from the given string and returns the
 * value and the rest of the string via the out parameter.
 */
base64Vlq.decode = function base64VLQ_decode(aStr, aIndex, aOutParam) {
  var strLen = aStr.length;
  var result = 0;
  var shift = 0;
  var continuation, digit;

  do {
    if (aIndex >= strLen) {
      throw new Error("Expected more digits in base 64 VLQ value.");
    }

    digit = base64.decode(aStr.charCodeAt(aIndex++));
    if (digit === -1) {
      throw new Error("Invalid base64 digit: " + aStr.charAt(aIndex - 1));
    }

    continuation = !!(digit & VLQ_CONTINUATION_BIT);
    digit &= VLQ_BASE_MASK;
    result = result + (digit << shift);
    shift += VLQ_BASE_SHIFT;
  } while (continuation);

  aOutParam.value = fromVLQSigned(result);
  aOutParam.rest = aIndex;
};

var util$5 = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

(function (exports) {
	/*
	 * Copyright 2011 Mozilla Foundation and contributors
	 * Licensed under the New BSD license. See LICENSE or:
	 * http://opensource.org/licenses/BSD-3-Clause
	 */

	/**
	 * This is a helper function for getting values from parameter/options
	 * objects.
	 *
	 * @param args The object we are extracting values from
	 * @param name The name of the property we are getting.
	 * @param defaultValue An optional value to return if the property is missing
	 * from the object. If this is not specified and the property is missing, an
	 * error will be thrown.
	 */
	function getArg(aArgs, aName, aDefaultValue) {
	  if (aName in aArgs) {
	    return aArgs[aName];
	  } else if (arguments.length === 3) {
	    return aDefaultValue;
	  } else {
	    throw new Error('"' + aName + '" is a required argument.');
	  }
	}
	exports.getArg = getArg;

	var urlRegexp = /^(?:([\w+\-.]+):)?\/\/(?:(\w+:\w+)@)?([\w.-]*)(?::(\d+))?(.*)$/;
	var dataUrlRegexp = /^data:.+\,.+$/;

	function urlParse(aUrl) {
	  var match = aUrl.match(urlRegexp);
	  if (!match) {
	    return null;
	  }
	  return {
	    scheme: match[1],
	    auth: match[2],
	    host: match[3],
	    port: match[4],
	    path: match[5]
	  };
	}
	exports.urlParse = urlParse;

	function urlGenerate(aParsedUrl) {
	  var url = '';
	  if (aParsedUrl.scheme) {
	    url += aParsedUrl.scheme + ':';
	  }
	  url += '//';
	  if (aParsedUrl.auth) {
	    url += aParsedUrl.auth + '@';
	  }
	  if (aParsedUrl.host) {
	    url += aParsedUrl.host;
	  }
	  if (aParsedUrl.port) {
	    url += ":" + aParsedUrl.port;
	  }
	  if (aParsedUrl.path) {
	    url += aParsedUrl.path;
	  }
	  return url;
	}
	exports.urlGenerate = urlGenerate;

	/**
	 * Normalizes a path, or the path portion of a URL:
	 *
	 * - Replaces consecutive slashes with one slash.
	 * - Removes unnecessary '.' parts.
	 * - Removes unnecessary '<dir>/..' parts.
	 *
	 * Based on code in the Node.js 'path' core module.
	 *
	 * @param aPath The path or url to normalize.
	 */
	function normalize(aPath) {
	  var path = aPath;
	  var url = urlParse(aPath);
	  if (url) {
	    if (!url.path) {
	      return aPath;
	    }
	    path = url.path;
	  }
	  var isAbsolute = exports.isAbsolute(path);

	  var parts = path.split(/\/+/);
	  for (var part, up = 0, i = parts.length - 1; i >= 0; i--) {
	    part = parts[i];
	    if (part === '.') {
	      parts.splice(i, 1);
	    } else if (part === '..') {
	      up++;
	    } else if (up > 0) {
	      if (part === '') {
	        // The first part is blank if the path is absolute. Trying to go
	        // above the root is a no-op. Therefore we can remove all '..' parts
	        // directly after the root.
	        parts.splice(i + 1, up);
	        up = 0;
	      } else {
	        parts.splice(i, 2);
	        up--;
	      }
	    }
	  }
	  path = parts.join('/');

	  if (path === '') {
	    path = isAbsolute ? '/' : '.';
	  }

	  if (url) {
	    url.path = path;
	    return urlGenerate(url);
	  }
	  return path;
	}
	exports.normalize = normalize;

	/**
	 * Joins two paths/URLs.
	 *
	 * @param aRoot The root path or URL.
	 * @param aPath The path or URL to be joined with the root.
	 *
	 * - If aPath is a URL or a data URI, aPath is returned, unless aPath is a
	 *   scheme-relative URL: Then the scheme of aRoot, if any, is prepended
	 *   first.
	 * - Otherwise aPath is a path. If aRoot is a URL, then its path portion
	 *   is updated with the result and aRoot is returned. Otherwise the result
	 *   is returned.
	 *   - If aPath is absolute, the result is aPath.
	 *   - Otherwise the two paths are joined with a slash.
	 * - Joining for example 'http://' and 'www.example.com' is also supported.
	 */
	function join(aRoot, aPath) {
	  if (aRoot === "") {
	    aRoot = ".";
	  }
	  if (aPath === "") {
	    aPath = ".";
	  }
	  var aPathUrl = urlParse(aPath);
	  var aRootUrl = urlParse(aRoot);
	  if (aRootUrl) {
	    aRoot = aRootUrl.path || '/';
	  }

	  // `join(foo, '//www.example.org')`
	  if (aPathUrl && !aPathUrl.scheme) {
	    if (aRootUrl) {
	      aPathUrl.scheme = aRootUrl.scheme;
	    }
	    return urlGenerate(aPathUrl);
	  }

	  if (aPathUrl || aPath.match(dataUrlRegexp)) {
	    return aPath;
	  }

	  // `join('http://', 'www.example.com')`
	  if (aRootUrl && !aRootUrl.host && !aRootUrl.path) {
	    aRootUrl.host = aPath;
	    return urlGenerate(aRootUrl);
	  }

	  var joined = aPath.charAt(0) === '/'
	    ? aPath
	    : normalize(aRoot.replace(/\/+$/, '') + '/' + aPath);

	  if (aRootUrl) {
	    aRootUrl.path = joined;
	    return urlGenerate(aRootUrl);
	  }
	  return joined;
	}
	exports.join = join;

	exports.isAbsolute = function (aPath) {
	  return aPath.charAt(0) === '/' || urlRegexp.test(aPath);
	};

	/**
	 * Make a path relative to a URL or another path.
	 *
	 * @param aRoot The root path or URL.
	 * @param aPath The path or URL to be made relative to aRoot.
	 */
	function relative(aRoot, aPath) {
	  if (aRoot === "") {
	    aRoot = ".";
	  }

	  aRoot = aRoot.replace(/\/$/, '');

	  // It is possible for the path to be above the root. In this case, simply
	  // checking whether the root is a prefix of the path won't work. Instead, we
	  // need to remove components from the root one by one, until either we find
	  // a prefix that fits, or we run out of components to remove.
	  var level = 0;
	  while (aPath.indexOf(aRoot + '/') !== 0) {
	    var index = aRoot.lastIndexOf("/");
	    if (index < 0) {
	      return aPath;
	    }

	    // If the only part of the root that is left is the scheme (i.e. http://,
	    // file:///, etc.), one or more slashes (/), or simply nothing at all, we
	    // have exhausted all components, so the path is not relative to the root.
	    aRoot = aRoot.slice(0, index);
	    if (aRoot.match(/^([^\/]+:\/)?\/*$/)) {
	      return aPath;
	    }

	    ++level;
	  }

	  // Make sure we add a "../" for each component we removed from the root.
	  return Array(level + 1).join("../") + aPath.substr(aRoot.length + 1);
	}
	exports.relative = relative;

	var supportsNullProto = (function () {
	  var obj = Object.create(null);
	  return !('__proto__' in obj);
	}());

	function identity (s) {
	  return s;
	}

	/**
	 * Because behavior goes wacky when you set `__proto__` on objects, we
	 * have to prefix all the strings in our set with an arbitrary character.
	 *
	 * See https://github.com/mozilla/source-map/pull/31 and
	 * https://github.com/mozilla/source-map/issues/30
	 *
	 * @param String aStr
	 */
	function toSetString(aStr) {
	  if (isProtoString(aStr)) {
	    return '$' + aStr;
	  }

	  return aStr;
	}
	exports.toSetString = supportsNullProto ? identity : toSetString;

	function fromSetString(aStr) {
	  if (isProtoString(aStr)) {
	    return aStr.slice(1);
	  }

	  return aStr;
	}
	exports.fromSetString = supportsNullProto ? identity : fromSetString;

	function isProtoString(s) {
	  if (!s) {
	    return false;
	  }

	  var length = s.length;

	  if (length < 9 /* "__proto__".length */) {
	    return false;
	  }

	  if (s.charCodeAt(length - 1) !== 95  /* '_' */ ||
	      s.charCodeAt(length - 2) !== 95  /* '_' */ ||
	      s.charCodeAt(length - 3) !== 111 /* 'o' */ ||
	      s.charCodeAt(length - 4) !== 116 /* 't' */ ||
	      s.charCodeAt(length - 5) !== 111 /* 'o' */ ||
	      s.charCodeAt(length - 6) !== 114 /* 'r' */ ||
	      s.charCodeAt(length - 7) !== 112 /* 'p' */ ||
	      s.charCodeAt(length - 8) !== 95  /* '_' */ ||
	      s.charCodeAt(length - 9) !== 95  /* '_' */) {
	    return false;
	  }

	  for (var i = length - 10; i >= 0; i--) {
	    if (s.charCodeAt(i) !== 36 /* '$' */) {
	      return false;
	    }
	  }

	  return true;
	}

	/**
	 * Comparator between two mappings where the original positions are compared.
	 *
	 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
	 * mappings with the same original source/line/column, but different generated
	 * line and column the same. Useful when searching for a mapping with a
	 * stubbed out mapping.
	 */
	function compareByOriginalPositions(mappingA, mappingB, onlyCompareOriginal) {
	  var cmp = strcmp(mappingA.source, mappingB.source);
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalLine - mappingB.originalLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalColumn - mappingB.originalColumn;
	  if (cmp !== 0 || onlyCompareOriginal) {
	    return cmp;
	  }

	  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.generatedLine - mappingB.generatedLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  return strcmp(mappingA.name, mappingB.name);
	}
	exports.compareByOriginalPositions = compareByOriginalPositions;

	/**
	 * Comparator between two mappings with deflated source and name indices where
	 * the generated positions are compared.
	 *
	 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
	 * mappings with the same generated line and column, but different
	 * source/name/original line and column the same. Useful when searching for a
	 * mapping with a stubbed out mapping.
	 */
	function compareByGeneratedPositionsDeflated(mappingA, mappingB, onlyCompareGenerated) {
	  var cmp = mappingA.generatedLine - mappingB.generatedLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
	  if (cmp !== 0 || onlyCompareGenerated) {
	    return cmp;
	  }

	  cmp = strcmp(mappingA.source, mappingB.source);
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalLine - mappingB.originalLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalColumn - mappingB.originalColumn;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  return strcmp(mappingA.name, mappingB.name);
	}
	exports.compareByGeneratedPositionsDeflated = compareByGeneratedPositionsDeflated;

	function strcmp(aStr1, aStr2) {
	  if (aStr1 === aStr2) {
	    return 0;
	  }

	  if (aStr1 === null) {
	    return 1; // aStr2 !== null
	  }

	  if (aStr2 === null) {
	    return -1; // aStr1 !== null
	  }

	  if (aStr1 > aStr2) {
	    return 1;
	  }

	  return -1;
	}

	/**
	 * Comparator between two mappings with inflated source and name strings where
	 * the generated positions are compared.
	 */
	function compareByGeneratedPositionsInflated(mappingA, mappingB) {
	  var cmp = mappingA.generatedLine - mappingB.generatedLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = strcmp(mappingA.source, mappingB.source);
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalLine - mappingB.originalLine;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  cmp = mappingA.originalColumn - mappingB.originalColumn;
	  if (cmp !== 0) {
	    return cmp;
	  }

	  return strcmp(mappingA.name, mappingB.name);
	}
	exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflated;

	/**
	 * Strip any JSON XSSI avoidance prefix from the string (as documented
	 * in the source maps specification), and then parse the string as
	 * JSON.
	 */
	function parseSourceMapInput(str) {
	  return JSON.parse(str.replace(/^\)]}'[^\n]*\n/, ''));
	}
	exports.parseSourceMapInput = parseSourceMapInput;

	/**
	 * Compute the URL of a source given the the source root, the source's
	 * URL, and the source map's URL.
	 */
	function computeSourceURL(sourceRoot, sourceURL, sourceMapURL) {
	  sourceURL = sourceURL || '';

	  if (sourceRoot) {
	    // This follows what Chrome does.
	    if (sourceRoot[sourceRoot.length - 1] !== '/' && sourceURL[0] !== '/') {
	      sourceRoot += '/';
	    }
	    // The spec says:
	    //   Line 4: An optional source root, useful for relocating source
	    //   files on a server or removing repeated values in the
	    //   “sources” entry.  This value is prepended to the individual
	    //   entries in the “source” field.
	    sourceURL = sourceRoot + sourceURL;
	  }

	  // Historically, SourceMapConsumer did not take the sourceMapURL as
	  // a parameter.  This mode is still somewhat supported, which is why
	  // this code block is conditional.  However, it's preferable to pass
	  // the source map URL to SourceMapConsumer, so that this function
	  // can implement the source URL resolution algorithm as outlined in
	  // the spec.  This block is basically the equivalent of:
	  //    new URL(sourceURL, sourceMapURL).toString()
	  // ... except it avoids using URL, which wasn't available in the
	  // older releases of node still supported by this library.
	  //
	  // The spec says:
	  //   If the sources are not absolute URLs after prepending of the
	  //   “sourceRoot”, the sources are resolved relative to the
	  //   SourceMap (like resolving script src in a html document).
	  if (sourceMapURL) {
	    var parsed = urlParse(sourceMapURL);
	    if (!parsed) {
	      throw new Error("sourceMapURL could not be parsed");
	    }
	    if (parsed.path) {
	      // Strip the last path component, but keep the "/".
	      var index = parsed.path.lastIndexOf('/');
	      if (index >= 0) {
	        parsed.path = parsed.path.substring(0, index + 1);
	      }
	    }
	    sourceURL = join(urlGenerate(parsed), sourceURL);
	  }

	  return normalize(sourceURL);
	}
	exports.computeSourceURL = computeSourceURL;
} (util$5));

var arraySet = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var util$4 = util$5;
var has = Object.prototype.hasOwnProperty;
var hasNativeMap = typeof Map !== "undefined";

/**
 * A data structure which is a combination of an array and a set. Adding a new
 * member is O(1), testing for membership is O(1), and finding the index of an
 * element is O(1). Removing elements from the set is not supported. Only
 * strings are supported for membership.
 */
function ArraySet$2() {
  this._array = [];
  this._set = hasNativeMap ? new Map() : Object.create(null);
}

/**
 * Static method for creating ArraySet instances from an existing array.
 */
ArraySet$2.fromArray = function ArraySet_fromArray(aArray, aAllowDuplicates) {
  var set = new ArraySet$2();
  for (var i = 0, len = aArray.length; i < len; i++) {
    set.add(aArray[i], aAllowDuplicates);
  }
  return set;
};

/**
 * Return how many unique items are in this ArraySet. If duplicates have been
 * added, than those do not count towards the size.
 *
 * @returns Number
 */
ArraySet$2.prototype.size = function ArraySet_size() {
  return hasNativeMap ? this._set.size : Object.getOwnPropertyNames(this._set).length;
};

/**
 * Add the given string to this set.
 *
 * @param String aStr
 */
ArraySet$2.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
  var sStr = hasNativeMap ? aStr : util$4.toSetString(aStr);
  var isDuplicate = hasNativeMap ? this.has(aStr) : has.call(this._set, sStr);
  var idx = this._array.length;
  if (!isDuplicate || aAllowDuplicates) {
    this._array.push(aStr);
  }
  if (!isDuplicate) {
    if (hasNativeMap) {
      this._set.set(aStr, idx);
    } else {
      this._set[sStr] = idx;
    }
  }
};

/**
 * Is the given string a member of this set?
 *
 * @param String aStr
 */
ArraySet$2.prototype.has = function ArraySet_has(aStr) {
  if (hasNativeMap) {
    return this._set.has(aStr);
  } else {
    var sStr = util$4.toSetString(aStr);
    return has.call(this._set, sStr);
  }
};

/**
 * What is the index of the given string in the array?
 *
 * @param String aStr
 */
ArraySet$2.prototype.indexOf = function ArraySet_indexOf(aStr) {
  if (hasNativeMap) {
    var idx = this._set.get(aStr);
    if (idx >= 0) {
        return idx;
    }
  } else {
    var sStr = util$4.toSetString(aStr);
    if (has.call(this._set, sStr)) {
      return this._set[sStr];
    }
  }

  throw new Error('"' + aStr + '" is not in the set.');
};

/**
 * What is the element at the given index?
 *
 * @param Number aIdx
 */
ArraySet$2.prototype.at = function ArraySet_at(aIdx) {
  if (aIdx >= 0 && aIdx < this._array.length) {
    return this._array[aIdx];
  }
  throw new Error('No element indexed by ' + aIdx);
};

/**
 * Returns the array representation of this set (which has the proper indices
 * indicated by indexOf). Note that this is a copy of the internal array used
 * for storing the members so that no one can mess with internal state.
 */
ArraySet$2.prototype.toArray = function ArraySet_toArray() {
  return this._array.slice();
};

arraySet.ArraySet = ArraySet$2;

var mappingList = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2014 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var util$3 = util$5;

/**
 * Determine whether mappingB is after mappingA with respect to generated
 * position.
 */
function generatedPositionAfter(mappingA, mappingB) {
  // Optimized for most common case
  var lineA = mappingA.generatedLine;
  var lineB = mappingB.generatedLine;
  var columnA = mappingA.generatedColumn;
  var columnB = mappingB.generatedColumn;
  return lineB > lineA || lineB == lineA && columnB >= columnA ||
         util$3.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
}

/**
 * A data structure to provide a sorted view of accumulated mappings in a
 * performance conscious manner. It trades a neglibable overhead in general
 * case for a large speedup in case of mappings being added in order.
 */
function MappingList$1() {
  this._array = [];
  this._sorted = true;
  // Serves as infimum
  this._last = {generatedLine: -1, generatedColumn: 0};
}

/**
 * Iterate through internal items. This method takes the same arguments that
 * `Array.prototype.forEach` takes.
 *
 * NOTE: The order of the mappings is NOT guaranteed.
 */
MappingList$1.prototype.unsortedForEach =
  function MappingList_forEach(aCallback, aThisArg) {
    this._array.forEach(aCallback, aThisArg);
  };

/**
 * Add the given source mapping.
 *
 * @param Object aMapping
 */
MappingList$1.prototype.add = function MappingList_add(aMapping) {
  if (generatedPositionAfter(this._last, aMapping)) {
    this._last = aMapping;
    this._array.push(aMapping);
  } else {
    this._sorted = false;
    this._array.push(aMapping);
  }
};

/**
 * Returns the flat, sorted array of mappings. The mappings are sorted by
 * generated position.
 *
 * WARNING: This method returns internal data without copying, for
 * performance. The return value must NOT be mutated, and should be treated as
 * an immutable borrow. If you want to take ownership, you must make your own
 * copy.
 */
MappingList$1.prototype.toArray = function MappingList_toArray() {
  if (!this._sorted) {
    this._array.sort(util$3.compareByGeneratedPositionsInflated);
    this._sorted = true;
  }
  return this._array;
};

mappingList.MappingList = MappingList$1;

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var base64VLQ$1 = base64Vlq;
var util$2 = util$5;
var ArraySet$1 = arraySet.ArraySet;
var MappingList = mappingList.MappingList;

/**
 * An instance of the SourceMapGenerator represents a source map which is
 * being built incrementally. You may pass an object with the following
 * properties:
 *
 *   - file: The filename of the generated source.
 *   - sourceRoot: A root for all relative URLs in this source map.
 */
function SourceMapGenerator$3(aArgs) {
  if (!aArgs) {
    aArgs = {};
  }
  this._file = util$2.getArg(aArgs, 'file', null);
  this._sourceRoot = util$2.getArg(aArgs, 'sourceRoot', null);
  this._skipValidation = util$2.getArg(aArgs, 'skipValidation', false);
  this._sources = new ArraySet$1();
  this._names = new ArraySet$1();
  this._mappings = new MappingList();
  this._sourcesContents = null;
}

SourceMapGenerator$3.prototype._version = 3;

/**
 * Creates a new SourceMapGenerator based on a SourceMapConsumer
 *
 * @param aSourceMapConsumer The SourceMap.
 */
SourceMapGenerator$3.fromSourceMap =
  function SourceMapGenerator_fromSourceMap(aSourceMapConsumer) {
    var sourceRoot = aSourceMapConsumer.sourceRoot;
    var generator = new SourceMapGenerator$3({
      file: aSourceMapConsumer.file,
      sourceRoot: sourceRoot
    });
    aSourceMapConsumer.eachMapping(function (mapping) {
      var newMapping = {
        generated: {
          line: mapping.generatedLine,
          column: mapping.generatedColumn
        }
      };

      if (mapping.source != null) {
        newMapping.source = mapping.source;
        if (sourceRoot != null) {
          newMapping.source = util$2.relative(sourceRoot, newMapping.source);
        }

        newMapping.original = {
          line: mapping.originalLine,
          column: mapping.originalColumn
        };

        if (mapping.name != null) {
          newMapping.name = mapping.name;
        }
      }

      generator.addMapping(newMapping);
    });
    aSourceMapConsumer.sources.forEach(function (sourceFile) {
      var sourceRelative = sourceFile;
      if (sourceRoot !== null) {
        sourceRelative = util$2.relative(sourceRoot, sourceFile);
      }

      if (!generator._sources.has(sourceRelative)) {
        generator._sources.add(sourceRelative);
      }

      var content = aSourceMapConsumer.sourceContentFor(sourceFile);
      if (content != null) {
        generator.setSourceContent(sourceFile, content);
      }
    });
    return generator;
  };

/**
 * Add a single mapping from original source line and column to the generated
 * source's line and column for this source map being created. The mapping
 * object should have the following properties:
 *
 *   - generated: An object with the generated line and column positions.
 *   - original: An object with the original line and column positions.
 *   - source: The original source file (relative to the sourceRoot).
 *   - name: An optional original token name for this mapping.
 */
SourceMapGenerator$3.prototype.addMapping =
  function SourceMapGenerator_addMapping(aArgs) {
    var generated = util$2.getArg(aArgs, 'generated');
    var original = util$2.getArg(aArgs, 'original', null);
    var source = util$2.getArg(aArgs, 'source', null);
    var name = util$2.getArg(aArgs, 'name', null);

    if (!this._skipValidation) {
      this._validateMapping(generated, original, source, name);
    }

    if (source != null) {
      source = String(source);
      if (!this._sources.has(source)) {
        this._sources.add(source);
      }
    }

    if (name != null) {
      name = String(name);
      if (!this._names.has(name)) {
        this._names.add(name);
      }
    }

    this._mappings.add({
      generatedLine: generated.line,
      generatedColumn: generated.column,
      originalLine: original != null && original.line,
      originalColumn: original != null && original.column,
      source: source,
      name: name
    });
  };

/**
 * Set the source content for a source file.
 */
SourceMapGenerator$3.prototype.setSourceContent =
  function SourceMapGenerator_setSourceContent(aSourceFile, aSourceContent) {
    var source = aSourceFile;
    if (this._sourceRoot != null) {
      source = util$2.relative(this._sourceRoot, source);
    }

    if (aSourceContent != null) {
      // Add the source content to the _sourcesContents map.
      // Create a new _sourcesContents map if the property is null.
      if (!this._sourcesContents) {
        this._sourcesContents = Object.create(null);
      }
      this._sourcesContents[util$2.toSetString(source)] = aSourceContent;
    } else if (this._sourcesContents) {
      // Remove the source file from the _sourcesContents map.
      // If the _sourcesContents map is empty, set the property to null.
      delete this._sourcesContents[util$2.toSetString(source)];
      if (Object.keys(this._sourcesContents).length === 0) {
        this._sourcesContents = null;
      }
    }
  };

/**
 * Applies the mappings of a sub-source-map for a specific source file to the
 * source map being generated. Each mapping to the supplied source file is
 * rewritten using the supplied source map. Note: The resolution for the
 * resulting mappings is the minimium of this map and the supplied map.
 *
 * @param aSourceMapConsumer The source map to be applied.
 * @param aSourceFile Optional. The filename of the source file.
 *        If omitted, SourceMapConsumer's file property will be used.
 * @param aSourceMapPath Optional. The dirname of the path to the source map
 *        to be applied. If relative, it is relative to the SourceMapConsumer.
 *        This parameter is needed when the two source maps aren't in the same
 *        directory, and the source map to be applied contains relative source
 *        paths. If so, those relative source paths need to be rewritten
 *        relative to the SourceMapGenerator.
 */
SourceMapGenerator$3.prototype.applySourceMap =
  function SourceMapGenerator_applySourceMap(aSourceMapConsumer, aSourceFile, aSourceMapPath) {
    var sourceFile = aSourceFile;
    // If aSourceFile is omitted, we will use the file property of the SourceMap
    if (aSourceFile == null) {
      if (aSourceMapConsumer.file == null) {
        throw new Error(
          'SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, ' +
          'or the source map\'s "file" property. Both were omitted.'
        );
      }
      sourceFile = aSourceMapConsumer.file;
    }
    var sourceRoot = this._sourceRoot;
    // Make "sourceFile" relative if an absolute Url is passed.
    if (sourceRoot != null) {
      sourceFile = util$2.relative(sourceRoot, sourceFile);
    }
    // Applying the SourceMap can add and remove items from the sources and
    // the names array.
    var newSources = new ArraySet$1();
    var newNames = new ArraySet$1();

    // Find mappings for the "sourceFile"
    this._mappings.unsortedForEach(function (mapping) {
      if (mapping.source === sourceFile && mapping.originalLine != null) {
        // Check if it can be mapped by the source map, then update the mapping.
        var original = aSourceMapConsumer.originalPositionFor({
          line: mapping.originalLine,
          column: mapping.originalColumn
        });
        if (original.source != null) {
          // Copy mapping
          mapping.source = original.source;
          if (aSourceMapPath != null) {
            mapping.source = util$2.join(aSourceMapPath, mapping.source);
          }
          if (sourceRoot != null) {
            mapping.source = util$2.relative(sourceRoot, mapping.source);
          }
          mapping.originalLine = original.line;
          mapping.originalColumn = original.column;
          if (original.name != null) {
            mapping.name = original.name;
          }
        }
      }

      var source = mapping.source;
      if (source != null && !newSources.has(source)) {
        newSources.add(source);
      }

      var name = mapping.name;
      if (name != null && !newNames.has(name)) {
        newNames.add(name);
      }

    }, this);
    this._sources = newSources;
    this._names = newNames;

    // Copy sourcesContents of applied map.
    aSourceMapConsumer.sources.forEach(function (sourceFile) {
      var content = aSourceMapConsumer.sourceContentFor(sourceFile);
      if (content != null) {
        if (aSourceMapPath != null) {
          sourceFile = util$2.join(aSourceMapPath, sourceFile);
        }
        if (sourceRoot != null) {
          sourceFile = util$2.relative(sourceRoot, sourceFile);
        }
        this.setSourceContent(sourceFile, content);
      }
    }, this);
  };

/**
 * A mapping can have one of the three levels of data:
 *
 *   1. Just the generated position.
 *   2. The Generated position, original position, and original source.
 *   3. Generated and original position, original source, as well as a name
 *      token.
 *
 * To maintain consistency, we validate that any new mapping being added falls
 * in to one of these categories.
 */
SourceMapGenerator$3.prototype._validateMapping =
  function SourceMapGenerator_validateMapping(aGenerated, aOriginal, aSource,
                                              aName) {
    // When aOriginal is truthy but has empty values for .line and .column,
    // it is most likely a programmer error. In this case we throw a very
    // specific error message to try to guide them the right way.
    // For example: https://github.com/Polymer/polymer-bundler/pull/519
    if (aOriginal && typeof aOriginal.line !== 'number' && typeof aOriginal.column !== 'number') {
        throw new Error(
            'original.line and original.column are not numbers -- you probably meant to omit ' +
            'the original mapping entirely and only map the generated position. If so, pass ' +
            'null for the original mapping instead of an object with empty or null values.'
        );
    }

    if (aGenerated && 'line' in aGenerated && 'column' in aGenerated
        && aGenerated.line > 0 && aGenerated.column >= 0
        && !aOriginal && !aSource && !aName) {
      // Case 1.
      return;
    }
    else if (aGenerated && 'line' in aGenerated && 'column' in aGenerated
             && aOriginal && 'line' in aOriginal && 'column' in aOriginal
             && aGenerated.line > 0 && aGenerated.column >= 0
             && aOriginal.line > 0 && aOriginal.column >= 0
             && aSource) {
      // Cases 2 and 3.
      return;
    }
    else {
      throw new Error('Invalid mapping: ' + JSON.stringify({
        generated: aGenerated,
        source: aSource,
        original: aOriginal,
        name: aName
      }));
    }
  };

/**
 * Serialize the accumulated mappings in to the stream of base 64 VLQs
 * specified by the source map format.
 */
SourceMapGenerator$3.prototype._serializeMappings =
  function SourceMapGenerator_serializeMappings() {
    var previousGeneratedColumn = 0;
    var previousGeneratedLine = 1;
    var previousOriginalColumn = 0;
    var previousOriginalLine = 0;
    var previousName = 0;
    var previousSource = 0;
    var result = '';
    var next;
    var mapping;
    var nameIdx;
    var sourceIdx;

    var mappings = this._mappings.toArray();
    for (var i = 0, len = mappings.length; i < len; i++) {
      mapping = mappings[i];
      next = '';

      if (mapping.generatedLine !== previousGeneratedLine) {
        previousGeneratedColumn = 0;
        while (mapping.generatedLine !== previousGeneratedLine) {
          next += ';';
          previousGeneratedLine++;
        }
      }
      else {
        if (i > 0) {
          if (!util$2.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
            continue;
          }
          next += ',';
        }
      }

      next += base64VLQ$1.encode(mapping.generatedColumn
                                 - previousGeneratedColumn);
      previousGeneratedColumn = mapping.generatedColumn;

      if (mapping.source != null) {
        sourceIdx = this._sources.indexOf(mapping.source);
        next += base64VLQ$1.encode(sourceIdx - previousSource);
        previousSource = sourceIdx;

        // lines are stored 0-based in SourceMap spec version 3
        next += base64VLQ$1.encode(mapping.originalLine - 1
                                   - previousOriginalLine);
        previousOriginalLine = mapping.originalLine - 1;

        next += base64VLQ$1.encode(mapping.originalColumn
                                   - previousOriginalColumn);
        previousOriginalColumn = mapping.originalColumn;

        if (mapping.name != null) {
          nameIdx = this._names.indexOf(mapping.name);
          next += base64VLQ$1.encode(nameIdx - previousName);
          previousName = nameIdx;
        }
      }

      result += next;
    }

    return result;
  };

SourceMapGenerator$3.prototype._generateSourcesContent =
  function SourceMapGenerator_generateSourcesContent(aSources, aSourceRoot) {
    return aSources.map(function (source) {
      if (!this._sourcesContents) {
        return null;
      }
      if (aSourceRoot != null) {
        source = util$2.relative(aSourceRoot, source);
      }
      var key = util$2.toSetString(source);
      return Object.prototype.hasOwnProperty.call(this._sourcesContents, key)
        ? this._sourcesContents[key]
        : null;
    }, this);
  };

/**
 * Externalize the source map.
 */
SourceMapGenerator$3.prototype.toJSON =
  function SourceMapGenerator_toJSON() {
    var map = {
      version: this._version,
      sources: this._sources.toArray(),
      names: this._names.toArray(),
      mappings: this._serializeMappings()
    };
    if (this._file != null) {
      map.file = this._file;
    }
    if (this._sourceRoot != null) {
      map.sourceRoot = this._sourceRoot;
    }
    if (this._sourcesContents) {
      map.sourcesContent = this._generateSourcesContent(map.sources, map.sourceRoot);
    }

    return map;
  };

/**
 * Render the source map being generated to a string.
 */
SourceMapGenerator$3.prototype.toString =
  function SourceMapGenerator_toString() {
    return JSON.stringify(this.toJSON());
  };

sourceMapGenerator.SourceMapGenerator = SourceMapGenerator$3;

var sourceMapConsumer = {};

var binarySearch$2 = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

(function (exports) {
	/*
	 * Copyright 2011 Mozilla Foundation and contributors
	 * Licensed under the New BSD license. See LICENSE or:
	 * http://opensource.org/licenses/BSD-3-Clause
	 */

	exports.GREATEST_LOWER_BOUND = 1;
	exports.LEAST_UPPER_BOUND = 2;

	/**
	 * Recursive implementation of binary search.
	 *
	 * @param aLow Indices here and lower do not contain the needle.
	 * @param aHigh Indices here and higher do not contain the needle.
	 * @param aNeedle The element being searched for.
	 * @param aHaystack The non-empty array being searched.
	 * @param aCompare Function which takes two elements and returns -1, 0, or 1.
	 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
	 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
	 *     closest element that is smaller than or greater than the one we are
	 *     searching for, respectively, if the exact element cannot be found.
	 */
	function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare, aBias) {
	  // This function terminates when one of the following is true:
	  //
	  //   1. We find the exact element we are looking for.
	  //
	  //   2. We did not find the exact element, but we can return the index of
	  //      the next-closest element.
	  //
	  //   3. We did not find the exact element, and there is no next-closest
	  //      element than the one we are searching for, so we return -1.
	  var mid = Math.floor((aHigh - aLow) / 2) + aLow;
	  var cmp = aCompare(aNeedle, aHaystack[mid], true);
	  if (cmp === 0) {
	    // Found the element we are looking for.
	    return mid;
	  }
	  else if (cmp > 0) {
	    // Our needle is greater than aHaystack[mid].
	    if (aHigh - mid > 1) {
	      // The element is in the upper half.
	      return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare, aBias);
	    }

	    // The exact needle element was not found in this haystack. Determine if
	    // we are in termination case (3) or (2) and return the appropriate thing.
	    if (aBias == exports.LEAST_UPPER_BOUND) {
	      return aHigh < aHaystack.length ? aHigh : -1;
	    } else {
	      return mid;
	    }
	  }
	  else {
	    // Our needle is less than aHaystack[mid].
	    if (mid - aLow > 1) {
	      // The element is in the lower half.
	      return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare, aBias);
	    }

	    // we are in termination case (3) or (2) and return the appropriate thing.
	    if (aBias == exports.LEAST_UPPER_BOUND) {
	      return mid;
	    } else {
	      return aLow < 0 ? -1 : aLow;
	    }
	  }
	}

	/**
	 * This is an implementation of binary search which will always try and return
	 * the index of the closest element if there is no exact hit. This is because
	 * mappings between original and generated line/col pairs are single points,
	 * and there is an implicit region between each of them, so a miss just means
	 * that you aren't on the very start of a region.
	 *
	 * @param aNeedle The element you are looking for.
	 * @param aHaystack The array that is being searched.
	 * @param aCompare A function which takes the needle and an element in the
	 *     array and returns -1, 0, or 1 depending on whether the needle is less
	 *     than, equal to, or greater than the element, respectively.
	 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
	 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
	 *     closest element that is smaller than or greater than the one we are
	 *     searching for, respectively, if the exact element cannot be found.
	 *     Defaults to 'binarySearch.GREATEST_LOWER_BOUND'.
	 */
	exports.search = function search(aNeedle, aHaystack, aCompare, aBias) {
	  if (aHaystack.length === 0) {
	    return -1;
	  }

	  var index = recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack,
	                              aCompare, aBias || exports.GREATEST_LOWER_BOUND);
	  if (index < 0) {
	    return -1;
	  }

	  // We have found either the exact element, or the next-closest element than
	  // the one we are searching for. However, there may be more than one such
	  // element. Make sure we always return the smallest of these.
	  while (index - 1 >= 0) {
	    if (aCompare(aHaystack[index], aHaystack[index - 1], true) !== 0) {
	      break;
	    }
	    --index;
	  }

	  return index;
	};
} (binarySearch$2));

var quickSort$1 = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

// It turns out that some (most?) JavaScript engines don't self-host
// `Array.prototype.sort`. This makes sense because C++ will likely remain
// faster than JS when doing raw CPU-intensive sorting. However, when using a
// custom comparator function, calling back and forth between the VM's C++ and
// JIT'd JS is rather slow *and* loses JIT type information, resulting in
// worse generated code for the comparator function than would be optimal. In
// fact, when sorting with a comparator, these costs outweigh the benefits of
// sorting in C++. By using our own JS-implemented Quick Sort (below), we get
// a ~3500ms mean speed-up in `bench/bench.html`.

/**
 * Swap the elements indexed by `x` and `y` in the array `ary`.
 *
 * @param {Array} ary
 *        The array.
 * @param {Number} x
 *        The index of the first item.
 * @param {Number} y
 *        The index of the second item.
 */
function swap(ary, x, y) {
  var temp = ary[x];
  ary[x] = ary[y];
  ary[y] = temp;
}

/**
 * Returns a random integer within the range `low .. high` inclusive.
 *
 * @param {Number} low
 *        The lower bound on the range.
 * @param {Number} high
 *        The upper bound on the range.
 */
function randomIntInRange(low, high) {
  return Math.round(low + (Math.random() * (high - low)));
}

/**
 * The Quick Sort algorithm.
 *
 * @param {Array} ary
 *        An array to sort.
 * @param {function} comparator
 *        Function to use to compare two items.
 * @param {Number} p
 *        Start index of the array
 * @param {Number} r
 *        End index of the array
 */
function doQuickSort(ary, comparator, p, r) {
  // If our lower bound is less than our upper bound, we (1) partition the
  // array into two pieces and (2) recurse on each half. If it is not, this is
  // the empty array and our base case.

  if (p < r) {
    // (1) Partitioning.
    //
    // The partitioning chooses a pivot between `p` and `r` and moves all
    // elements that are less than or equal to the pivot to the before it, and
    // all the elements that are greater than it after it. The effect is that
    // once partition is done, the pivot is in the exact place it will be when
    // the array is put in sorted order, and it will not need to be moved
    // again. This runs in O(n) time.

    // Always choose a random pivot so that an input array which is reverse
    // sorted does not cause O(n^2) running time.
    var pivotIndex = randomIntInRange(p, r);
    var i = p - 1;

    swap(ary, pivotIndex, r);
    var pivot = ary[r];

    // Immediately after `j` is incremented in this loop, the following hold
    // true:
    //
    //   * Every element in `ary[p .. i]` is less than or equal to the pivot.
    //
    //   * Every element in `ary[i+1 .. j-1]` is greater than the pivot.
    for (var j = p; j < r; j++) {
      if (comparator(ary[j], pivot) <= 0) {
        i += 1;
        swap(ary, i, j);
      }
    }

    swap(ary, i + 1, j);
    var q = i + 1;

    // (2) Recurse on each half.

    doQuickSort(ary, comparator, p, q - 1);
    doQuickSort(ary, comparator, q + 1, r);
  }
}

/**
 * Sort the given array in-place with the given comparator function.
 *
 * @param {Array} ary
 *        An array to sort.
 * @param {function} comparator
 *        Function to use to compare two items.
 */
quickSort$1.quickSort = function (ary, comparator) {
  doQuickSort(ary, comparator, 0, ary.length - 1);
};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var util$1 = util$5;
var binarySearch$1 = binarySearch$2;
var ArraySet = arraySet.ArraySet;
var base64VLQ = base64Vlq;
var quickSort = quickSort$1.quickSort;

function SourceMapConsumer$2(aSourceMap, aSourceMapURL) {
  var sourceMap = aSourceMap;
  if (typeof aSourceMap === 'string') {
    sourceMap = util$1.parseSourceMapInput(aSourceMap);
  }

  return sourceMap.sections != null
    ? new IndexedSourceMapConsumer(sourceMap, aSourceMapURL)
    : new BasicSourceMapConsumer(sourceMap, aSourceMapURL);
}

SourceMapConsumer$2.fromSourceMap = function(aSourceMap, aSourceMapURL) {
  return BasicSourceMapConsumer.fromSourceMap(aSourceMap, aSourceMapURL);
};

/**
 * The version of the source mapping spec that we are consuming.
 */
SourceMapConsumer$2.prototype._version = 3;

// `__generatedMappings` and `__originalMappings` are arrays that hold the
// parsed mapping coordinates from the source map's "mappings" attribute. They
// are lazily instantiated, accessed via the `_generatedMappings` and
// `_originalMappings` getters respectively, and we only parse the mappings
// and create these arrays once queried for a source location. We jump through
// these hoops because there can be many thousands of mappings, and parsing
// them is expensive, so we only want to do it if we must.
//
// Each object in the arrays is of the form:
//
//     {
//       generatedLine: The line number in the generated code,
//       generatedColumn: The column number in the generated code,
//       source: The path to the original source file that generated this
//               chunk of code,
//       originalLine: The line number in the original source that
//                     corresponds to this chunk of generated code,
//       originalColumn: The column number in the original source that
//                       corresponds to this chunk of generated code,
//       name: The name of the original symbol which generated this chunk of
//             code.
//     }
//
// All properties except for `generatedLine` and `generatedColumn` can be
// `null`.
//
// `_generatedMappings` is ordered by the generated positions.
//
// `_originalMappings` is ordered by the original positions.

SourceMapConsumer$2.prototype.__generatedMappings = null;
Object.defineProperty(SourceMapConsumer$2.prototype, '_generatedMappings', {
  configurable: true,
  enumerable: true,
  get: function () {
    if (!this.__generatedMappings) {
      this._parseMappings(this._mappings, this.sourceRoot);
    }

    return this.__generatedMappings;
  }
});

SourceMapConsumer$2.prototype.__originalMappings = null;
Object.defineProperty(SourceMapConsumer$2.prototype, '_originalMappings', {
  configurable: true,
  enumerable: true,
  get: function () {
    if (!this.__originalMappings) {
      this._parseMappings(this._mappings, this.sourceRoot);
    }

    return this.__originalMappings;
  }
});

SourceMapConsumer$2.prototype._charIsMappingSeparator =
  function SourceMapConsumer_charIsMappingSeparator(aStr, index) {
    var c = aStr.charAt(index);
    return c === ";" || c === ",";
  };

/**
 * Parse the mappings in a string in to a data structure which we can easily
 * query (the ordered arrays in the `this.__generatedMappings` and
 * `this.__originalMappings` properties).
 */
SourceMapConsumer$2.prototype._parseMappings =
  function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
    throw new Error("Subclasses must implement _parseMappings");
  };

SourceMapConsumer$2.GENERATED_ORDER = 1;
SourceMapConsumer$2.ORIGINAL_ORDER = 2;

SourceMapConsumer$2.GREATEST_LOWER_BOUND = 1;
SourceMapConsumer$2.LEAST_UPPER_BOUND = 2;

/**
 * Iterate over each mapping between an original source/line/column and a
 * generated line/column in this source map.
 *
 * @param Function aCallback
 *        The function that is called with each mapping.
 * @param Object aContext
 *        Optional. If specified, this object will be the value of `this` every
 *        time that `aCallback` is called.
 * @param aOrder
 *        Either `SourceMapConsumer.GENERATED_ORDER` or
 *        `SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to
 *        iterate over the mappings sorted by the generated file's line/column
 *        order or the original's source/line/column order, respectively. Defaults to
 *        `SourceMapConsumer.GENERATED_ORDER`.
 */
SourceMapConsumer$2.prototype.eachMapping =
  function SourceMapConsumer_eachMapping(aCallback, aContext, aOrder) {
    var context = aContext || null;
    var order = aOrder || SourceMapConsumer$2.GENERATED_ORDER;

    var mappings;
    switch (order) {
    case SourceMapConsumer$2.GENERATED_ORDER:
      mappings = this._generatedMappings;
      break;
    case SourceMapConsumer$2.ORIGINAL_ORDER:
      mappings = this._originalMappings;
      break;
    default:
      throw new Error("Unknown order of iteration.");
    }

    var sourceRoot = this.sourceRoot;
    mappings.map(function (mapping) {
      var source = mapping.source === null ? null : this._sources.at(mapping.source);
      source = util$1.computeSourceURL(sourceRoot, source, this._sourceMapURL);
      return {
        source: source,
        generatedLine: mapping.generatedLine,
        generatedColumn: mapping.generatedColumn,
        originalLine: mapping.originalLine,
        originalColumn: mapping.originalColumn,
        name: mapping.name === null ? null : this._names.at(mapping.name)
      };
    }, this).forEach(aCallback, context);
  };

/**
 * Returns all generated line and column information for the original source,
 * line, and column provided. If no column is provided, returns all mappings
 * corresponding to a either the line we are searching for or the next
 * closest line that has any mappings. Otherwise, returns all mappings
 * corresponding to the given line and either the column we are searching for
 * or the next closest column that has any offsets.
 *
 * The only argument is an object with the following properties:
 *
 *   - source: The filename of the original source.
 *   - line: The line number in the original source.  The line number is 1-based.
 *   - column: Optional. the column number in the original source.
 *    The column number is 0-based.
 *
 * and an array of objects is returned, each with the following properties:
 *
 *   - line: The line number in the generated source, or null.  The
 *    line number is 1-based.
 *   - column: The column number in the generated source, or null.
 *    The column number is 0-based.
 */
SourceMapConsumer$2.prototype.allGeneratedPositionsFor =
  function SourceMapConsumer_allGeneratedPositionsFor(aArgs) {
    var line = util$1.getArg(aArgs, 'line');

    // When there is no exact match, BasicSourceMapConsumer.prototype._findMapping
    // returns the index of the closest mapping less than the needle. By
    // setting needle.originalColumn to 0, we thus find the last mapping for
    // the given line, provided such a mapping exists.
    var needle = {
      source: util$1.getArg(aArgs, 'source'),
      originalLine: line,
      originalColumn: util$1.getArg(aArgs, 'column', 0)
    };

    needle.source = this._findSourceIndex(needle.source);
    if (needle.source < 0) {
      return [];
    }

    var mappings = [];

    var index = this._findMapping(needle,
                                  this._originalMappings,
                                  "originalLine",
                                  "originalColumn",
                                  util$1.compareByOriginalPositions,
                                  binarySearch$1.LEAST_UPPER_BOUND);
    if (index >= 0) {
      var mapping = this._originalMappings[index];

      if (aArgs.column === undefined) {
        var originalLine = mapping.originalLine;

        // Iterate until either we run out of mappings, or we run into
        // a mapping for a different line than the one we found. Since
        // mappings are sorted, this is guaranteed to find all mappings for
        // the line we found.
        while (mapping && mapping.originalLine === originalLine) {
          mappings.push({
            line: util$1.getArg(mapping, 'generatedLine', null),
            column: util$1.getArg(mapping, 'generatedColumn', null),
            lastColumn: util$1.getArg(mapping, 'lastGeneratedColumn', null)
          });

          mapping = this._originalMappings[++index];
        }
      } else {
        var originalColumn = mapping.originalColumn;

        // Iterate until either we run out of mappings, or we run into
        // a mapping for a different line than the one we were searching for.
        // Since mappings are sorted, this is guaranteed to find all mappings for
        // the line we are searching for.
        while (mapping &&
               mapping.originalLine === line &&
               mapping.originalColumn == originalColumn) {
          mappings.push({
            line: util$1.getArg(mapping, 'generatedLine', null),
            column: util$1.getArg(mapping, 'generatedColumn', null),
            lastColumn: util$1.getArg(mapping, 'lastGeneratedColumn', null)
          });

          mapping = this._originalMappings[++index];
        }
      }
    }

    return mappings;
  };

sourceMapConsumer.SourceMapConsumer = SourceMapConsumer$2;

/**
 * A BasicSourceMapConsumer instance represents a parsed source map which we can
 * query for information about the original file positions by giving it a file
 * position in the generated source.
 *
 * The first parameter is the raw source map (either as a JSON string, or
 * already parsed to an object). According to the spec, source maps have the
 * following attributes:
 *
 *   - version: Which version of the source map spec this map is following.
 *   - sources: An array of URLs to the original source files.
 *   - names: An array of identifiers which can be referrenced by individual mappings.
 *   - sourceRoot: Optional. The URL root from which all sources are relative.
 *   - sourcesContent: Optional. An array of contents of the original source files.
 *   - mappings: A string of base64 VLQs which contain the actual mappings.
 *   - file: Optional. The generated file this source map is associated with.
 *
 * Here is an example source map, taken from the source map spec[0]:
 *
 *     {
 *       version : 3,
 *       file: "out.js",
 *       sourceRoot : "",
 *       sources: ["foo.js", "bar.js"],
 *       names: ["src", "maps", "are", "fun"],
 *       mappings: "AA,AB;;ABCDE;"
 *     }
 *
 * The second parameter, if given, is a string whose value is the URL
 * at which the source map was found.  This URL is used to compute the
 * sources array.
 *
 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
 */
function BasicSourceMapConsumer(aSourceMap, aSourceMapURL) {
  var sourceMap = aSourceMap;
  if (typeof aSourceMap === 'string') {
    sourceMap = util$1.parseSourceMapInput(aSourceMap);
  }

  var version = util$1.getArg(sourceMap, 'version');
  var sources = util$1.getArg(sourceMap, 'sources');
  // Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
  // requires the array) to play nice here.
  var names = util$1.getArg(sourceMap, 'names', []);
  var sourceRoot = util$1.getArg(sourceMap, 'sourceRoot', null);
  var sourcesContent = util$1.getArg(sourceMap, 'sourcesContent', null);
  var mappings = util$1.getArg(sourceMap, 'mappings');
  var file = util$1.getArg(sourceMap, 'file', null);

  // Once again, Sass deviates from the spec and supplies the version as a
  // string rather than a number, so we use loose equality checking here.
  if (version != this._version) {
    throw new Error('Unsupported version: ' + version);
  }

  if (sourceRoot) {
    sourceRoot = util$1.normalize(sourceRoot);
  }

  sources = sources
    .map(String)
    // Some source maps produce relative source paths like "./foo.js" instead of
    // "foo.js".  Normalize these first so that future comparisons will succeed.
    // See bugzil.la/1090768.
    .map(util$1.normalize)
    // Always ensure that absolute sources are internally stored relative to
    // the source root, if the source root is absolute. Not doing this would
    // be particularly problematic when the source root is a prefix of the
    // source (valid, but why??). See github issue #199 and bugzil.la/1188982.
    .map(function (source) {
      return sourceRoot && util$1.isAbsolute(sourceRoot) && util$1.isAbsolute(source)
        ? util$1.relative(sourceRoot, source)
        : source;
    });

  // Pass `true` below to allow duplicate names and sources. While source maps
  // are intended to be compressed and deduplicated, the TypeScript compiler
  // sometimes generates source maps with duplicates in them. See Github issue
  // #72 and bugzil.la/889492.
  this._names = ArraySet.fromArray(names.map(String), true);
  this._sources = ArraySet.fromArray(sources, true);

  this._absoluteSources = this._sources.toArray().map(function (s) {
    return util$1.computeSourceURL(sourceRoot, s, aSourceMapURL);
  });

  this.sourceRoot = sourceRoot;
  this.sourcesContent = sourcesContent;
  this._mappings = mappings;
  this._sourceMapURL = aSourceMapURL;
  this.file = file;
}

BasicSourceMapConsumer.prototype = Object.create(SourceMapConsumer$2.prototype);
BasicSourceMapConsumer.prototype.consumer = SourceMapConsumer$2;

/**
 * Utility function to find the index of a source.  Returns -1 if not
 * found.
 */
BasicSourceMapConsumer.prototype._findSourceIndex = function(aSource) {
  var relativeSource = aSource;
  if (this.sourceRoot != null) {
    relativeSource = util$1.relative(this.sourceRoot, relativeSource);
  }

  if (this._sources.has(relativeSource)) {
    return this._sources.indexOf(relativeSource);
  }

  // Maybe aSource is an absolute URL as returned by |sources|.  In
  // this case we can't simply undo the transform.
  var i;
  for (i = 0; i < this._absoluteSources.length; ++i) {
    if (this._absoluteSources[i] == aSource) {
      return i;
    }
  }

  return -1;
};

/**
 * Create a BasicSourceMapConsumer from a SourceMapGenerator.
 *
 * @param SourceMapGenerator aSourceMap
 *        The source map that will be consumed.
 * @param String aSourceMapURL
 *        The URL at which the source map can be found (optional)
 * @returns BasicSourceMapConsumer
 */
BasicSourceMapConsumer.fromSourceMap =
  function SourceMapConsumer_fromSourceMap(aSourceMap, aSourceMapURL) {
    var smc = Object.create(BasicSourceMapConsumer.prototype);

    var names = smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
    var sources = smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
    smc.sourceRoot = aSourceMap._sourceRoot;
    smc.sourcesContent = aSourceMap._generateSourcesContent(smc._sources.toArray(),
                                                            smc.sourceRoot);
    smc.file = aSourceMap._file;
    smc._sourceMapURL = aSourceMapURL;
    smc._absoluteSources = smc._sources.toArray().map(function (s) {
      return util$1.computeSourceURL(smc.sourceRoot, s, aSourceMapURL);
    });

    // Because we are modifying the entries (by converting string sources and
    // names to indices into the sources and names ArraySets), we have to make
    // a copy of the entry or else bad things happen. Shared mutable state
    // strikes again! See github issue #191.

    var generatedMappings = aSourceMap._mappings.toArray().slice();
    var destGeneratedMappings = smc.__generatedMappings = [];
    var destOriginalMappings = smc.__originalMappings = [];

    for (var i = 0, length = generatedMappings.length; i < length; i++) {
      var srcMapping = generatedMappings[i];
      var destMapping = new Mapping;
      destMapping.generatedLine = srcMapping.generatedLine;
      destMapping.generatedColumn = srcMapping.generatedColumn;

      if (srcMapping.source) {
        destMapping.source = sources.indexOf(srcMapping.source);
        destMapping.originalLine = srcMapping.originalLine;
        destMapping.originalColumn = srcMapping.originalColumn;

        if (srcMapping.name) {
          destMapping.name = names.indexOf(srcMapping.name);
        }

        destOriginalMappings.push(destMapping);
      }

      destGeneratedMappings.push(destMapping);
    }

    quickSort(smc.__originalMappings, util$1.compareByOriginalPositions);

    return smc;
  };

/**
 * The version of the source mapping spec that we are consuming.
 */
BasicSourceMapConsumer.prototype._version = 3;

/**
 * The list of original sources.
 */
Object.defineProperty(BasicSourceMapConsumer.prototype, 'sources', {
  get: function () {
    return this._absoluteSources.slice();
  }
});

/**
 * Provide the JIT with a nice shape / hidden class.
 */
function Mapping() {
  this.generatedLine = 0;
  this.generatedColumn = 0;
  this.source = null;
  this.originalLine = null;
  this.originalColumn = null;
  this.name = null;
}

/**
 * Parse the mappings in a string in to a data structure which we can easily
 * query (the ordered arrays in the `this.__generatedMappings` and
 * `this.__originalMappings` properties).
 */
BasicSourceMapConsumer.prototype._parseMappings =
  function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
    var generatedLine = 1;
    var previousGeneratedColumn = 0;
    var previousOriginalLine = 0;
    var previousOriginalColumn = 0;
    var previousSource = 0;
    var previousName = 0;
    var length = aStr.length;
    var index = 0;
    var cachedSegments = {};
    var temp = {};
    var originalMappings = [];
    var generatedMappings = [];
    var mapping, str, segment, end, value;

    while (index < length) {
      if (aStr.charAt(index) === ';') {
        generatedLine++;
        index++;
        previousGeneratedColumn = 0;
      }
      else if (aStr.charAt(index) === ',') {
        index++;
      }
      else {
        mapping = new Mapping();
        mapping.generatedLine = generatedLine;

        // Because each offset is encoded relative to the previous one,
        // many segments often have the same encoding. We can exploit this
        // fact by caching the parsed variable length fields of each segment,
        // allowing us to avoid a second parse if we encounter the same
        // segment again.
        for (end = index; end < length; end++) {
          if (this._charIsMappingSeparator(aStr, end)) {
            break;
          }
        }
        str = aStr.slice(index, end);

        segment = cachedSegments[str];
        if (segment) {
          index += str.length;
        } else {
          segment = [];
          while (index < end) {
            base64VLQ.decode(aStr, index, temp);
            value = temp.value;
            index = temp.rest;
            segment.push(value);
          }

          if (segment.length === 2) {
            throw new Error('Found a source, but no line and column');
          }

          if (segment.length === 3) {
            throw new Error('Found a source and line, but no column');
          }

          cachedSegments[str] = segment;
        }

        // Generated column.
        mapping.generatedColumn = previousGeneratedColumn + segment[0];
        previousGeneratedColumn = mapping.generatedColumn;

        if (segment.length > 1) {
          // Original source.
          mapping.source = previousSource + segment[1];
          previousSource += segment[1];

          // Original line.
          mapping.originalLine = previousOriginalLine + segment[2];
          previousOriginalLine = mapping.originalLine;
          // Lines are stored 0-based
          mapping.originalLine += 1;

          // Original column.
          mapping.originalColumn = previousOriginalColumn + segment[3];
          previousOriginalColumn = mapping.originalColumn;

          if (segment.length > 4) {
            // Original name.
            mapping.name = previousName + segment[4];
            previousName += segment[4];
          }
        }

        generatedMappings.push(mapping);
        if (typeof mapping.originalLine === 'number') {
          originalMappings.push(mapping);
        }
      }
    }

    quickSort(generatedMappings, util$1.compareByGeneratedPositionsDeflated);
    this.__generatedMappings = generatedMappings;

    quickSort(originalMappings, util$1.compareByOriginalPositions);
    this.__originalMappings = originalMappings;
  };

/**
 * Find the mapping that best matches the hypothetical "needle" mapping that
 * we are searching for in the given "haystack" of mappings.
 */
BasicSourceMapConsumer.prototype._findMapping =
  function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName,
                                         aColumnName, aComparator, aBias) {
    // To return the position we are searching for, we must first find the
    // mapping for the given position and then return the opposite position it
    // points to. Because the mappings are sorted, we can use binary search to
    // find the best mapping.

    if (aNeedle[aLineName] <= 0) {
      throw new TypeError('Line must be greater than or equal to 1, got '
                          + aNeedle[aLineName]);
    }
    if (aNeedle[aColumnName] < 0) {
      throw new TypeError('Column must be greater than or equal to 0, got '
                          + aNeedle[aColumnName]);
    }

    return binarySearch$1.search(aNeedle, aMappings, aComparator, aBias);
  };

/**
 * Compute the last column for each generated mapping. The last column is
 * inclusive.
 */
BasicSourceMapConsumer.prototype.computeColumnSpans =
  function SourceMapConsumer_computeColumnSpans() {
    for (var index = 0; index < this._generatedMappings.length; ++index) {
      var mapping = this._generatedMappings[index];

      // Mappings do not contain a field for the last generated columnt. We
      // can come up with an optimistic estimate, however, by assuming that
      // mappings are contiguous (i.e. given two consecutive mappings, the
      // first mapping ends where the second one starts).
      if (index + 1 < this._generatedMappings.length) {
        var nextMapping = this._generatedMappings[index + 1];

        if (mapping.generatedLine === nextMapping.generatedLine) {
          mapping.lastGeneratedColumn = nextMapping.generatedColumn - 1;
          continue;
        }
      }

      // The last mapping for each line spans the entire line.
      mapping.lastGeneratedColumn = Infinity;
    }
  };

/**
 * Returns the original source, line, and column information for the generated
 * source's line and column positions provided. The only argument is an object
 * with the following properties:
 *
 *   - line: The line number in the generated source.  The line number
 *     is 1-based.
 *   - column: The column number in the generated source.  The column
 *     number is 0-based.
 *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
 *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
 *     closest element that is smaller than or greater than the one we are
 *     searching for, respectively, if the exact element cannot be found.
 *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
 *
 * and an object is returned with the following properties:
 *
 *   - source: The original source file, or null.
 *   - line: The line number in the original source, or null.  The
 *     line number is 1-based.
 *   - column: The column number in the original source, or null.  The
 *     column number is 0-based.
 *   - name: The original identifier, or null.
 */
BasicSourceMapConsumer.prototype.originalPositionFor =
  function SourceMapConsumer_originalPositionFor(aArgs) {
    var needle = {
      generatedLine: util$1.getArg(aArgs, 'line'),
      generatedColumn: util$1.getArg(aArgs, 'column')
    };

    var index = this._findMapping(
      needle,
      this._generatedMappings,
      "generatedLine",
      "generatedColumn",
      util$1.compareByGeneratedPositionsDeflated,
      util$1.getArg(aArgs, 'bias', SourceMapConsumer$2.GREATEST_LOWER_BOUND)
    );

    if (index >= 0) {
      var mapping = this._generatedMappings[index];

      if (mapping.generatedLine === needle.generatedLine) {
        var source = util$1.getArg(mapping, 'source', null);
        if (source !== null) {
          source = this._sources.at(source);
          source = util$1.computeSourceURL(this.sourceRoot, source, this._sourceMapURL);
        }
        var name = util$1.getArg(mapping, 'name', null);
        if (name !== null) {
          name = this._names.at(name);
        }
        return {
          source: source,
          line: util$1.getArg(mapping, 'originalLine', null),
          column: util$1.getArg(mapping, 'originalColumn', null),
          name: name
        };
      }
    }

    return {
      source: null,
      line: null,
      column: null,
      name: null
    };
  };

/**
 * Return true if we have the source content for every source in the source
 * map, false otherwise.
 */
BasicSourceMapConsumer.prototype.hasContentsOfAllSources =
  function BasicSourceMapConsumer_hasContentsOfAllSources() {
    if (!this.sourcesContent) {
      return false;
    }
    return this.sourcesContent.length >= this._sources.size() &&
      !this.sourcesContent.some(function (sc) { return sc == null; });
  };

/**
 * Returns the original source content. The only argument is the url of the
 * original source file. Returns null if no original source content is
 * available.
 */
BasicSourceMapConsumer.prototype.sourceContentFor =
  function SourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
    if (!this.sourcesContent) {
      return null;
    }

    var index = this._findSourceIndex(aSource);
    if (index >= 0) {
      return this.sourcesContent[index];
    }

    var relativeSource = aSource;
    if (this.sourceRoot != null) {
      relativeSource = util$1.relative(this.sourceRoot, relativeSource);
    }

    var url;
    if (this.sourceRoot != null
        && (url = util$1.urlParse(this.sourceRoot))) {
      // XXX: file:// URIs and absolute paths lead to unexpected behavior for
      // many users. We can help them out when they expect file:// URIs to
      // behave like it would if they were running a local HTTP server. See
      // https://bugzilla.mozilla.org/show_bug.cgi?id=885597.
      var fileUriAbsPath = relativeSource.replace(/^file:\/\//, "");
      if (url.scheme == "file"
          && this._sources.has(fileUriAbsPath)) {
        return this.sourcesContent[this._sources.indexOf(fileUriAbsPath)]
      }

      if ((!url.path || url.path == "/")
          && this._sources.has("/" + relativeSource)) {
        return this.sourcesContent[this._sources.indexOf("/" + relativeSource)];
      }
    }

    // This function is used recursively from
    // IndexedSourceMapConsumer.prototype.sourceContentFor. In that case, we
    // don't want to throw if we can't find the source - we just want to
    // return null, so we provide a flag to exit gracefully.
    if (nullOnMissing) {
      return null;
    }
    else {
      throw new Error('"' + relativeSource + '" is not in the SourceMap.');
    }
  };

/**
 * Returns the generated line and column information for the original source,
 * line, and column positions provided. The only argument is an object with
 * the following properties:
 *
 *   - source: The filename of the original source.
 *   - line: The line number in the original source.  The line number
 *     is 1-based.
 *   - column: The column number in the original source.  The column
 *     number is 0-based.
 *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
 *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
 *     closest element that is smaller than or greater than the one we are
 *     searching for, respectively, if the exact element cannot be found.
 *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
 *
 * and an object is returned with the following properties:
 *
 *   - line: The line number in the generated source, or null.  The
 *     line number is 1-based.
 *   - column: The column number in the generated source, or null.
 *     The column number is 0-based.
 */
BasicSourceMapConsumer.prototype.generatedPositionFor =
  function SourceMapConsumer_generatedPositionFor(aArgs) {
    var source = util$1.getArg(aArgs, 'source');
    source = this._findSourceIndex(source);
    if (source < 0) {
      return {
        line: null,
        column: null,
        lastColumn: null
      };
    }

    var needle = {
      source: source,
      originalLine: util$1.getArg(aArgs, 'line'),
      originalColumn: util$1.getArg(aArgs, 'column')
    };

    var index = this._findMapping(
      needle,
      this._originalMappings,
      "originalLine",
      "originalColumn",
      util$1.compareByOriginalPositions,
      util$1.getArg(aArgs, 'bias', SourceMapConsumer$2.GREATEST_LOWER_BOUND)
    );

    if (index >= 0) {
      var mapping = this._originalMappings[index];

      if (mapping.source === needle.source) {
        return {
          line: util$1.getArg(mapping, 'generatedLine', null),
          column: util$1.getArg(mapping, 'generatedColumn', null),
          lastColumn: util$1.getArg(mapping, 'lastGeneratedColumn', null)
        };
      }
    }

    return {
      line: null,
      column: null,
      lastColumn: null
    };
  };

sourceMapConsumer.BasicSourceMapConsumer = BasicSourceMapConsumer;

/**
 * An IndexedSourceMapConsumer instance represents a parsed source map which
 * we can query for information. It differs from BasicSourceMapConsumer in
 * that it takes "indexed" source maps (i.e. ones with a "sections" field) as
 * input.
 *
 * The first parameter is a raw source map (either as a JSON string, or already
 * parsed to an object). According to the spec for indexed source maps, they
 * have the following attributes:
 *
 *   - version: Which version of the source map spec this map is following.
 *   - file: Optional. The generated file this source map is associated with.
 *   - sections: A list of section definitions.
 *
 * Each value under the "sections" field has two fields:
 *   - offset: The offset into the original specified at which this section
 *       begins to apply, defined as an object with a "line" and "column"
 *       field.
 *   - map: A source map definition. This source map could also be indexed,
 *       but doesn't have to be.
 *
 * Instead of the "map" field, it's also possible to have a "url" field
 * specifying a URL to retrieve a source map from, but that's currently
 * unsupported.
 *
 * Here's an example source map, taken from the source map spec[0], but
 * modified to omit a section which uses the "url" field.
 *
 *  {
 *    version : 3,
 *    file: "app.js",
 *    sections: [{
 *      offset: {line:100, column:10},
 *      map: {
 *        version : 3,
 *        file: "section.js",
 *        sources: ["foo.js", "bar.js"],
 *        names: ["src", "maps", "are", "fun"],
 *        mappings: "AAAA,E;;ABCDE;"
 *      }
 *    }],
 *  }
 *
 * The second parameter, if given, is a string whose value is the URL
 * at which the source map was found.  This URL is used to compute the
 * sources array.
 *
 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#heading=h.535es3xeprgt
 */
function IndexedSourceMapConsumer(aSourceMap, aSourceMapURL) {
  var sourceMap = aSourceMap;
  if (typeof aSourceMap === 'string') {
    sourceMap = util$1.parseSourceMapInput(aSourceMap);
  }

  var version = util$1.getArg(sourceMap, 'version');
  var sections = util$1.getArg(sourceMap, 'sections');

  if (version != this._version) {
    throw new Error('Unsupported version: ' + version);
  }

  this._sources = new ArraySet();
  this._names = new ArraySet();

  var lastOffset = {
    line: -1,
    column: 0
  };
  this._sections = sections.map(function (s) {
    if (s.url) {
      // The url field will require support for asynchronicity.
      // See https://github.com/mozilla/source-map/issues/16
      throw new Error('Support for url field in sections not implemented.');
    }
    var offset = util$1.getArg(s, 'offset');
    var offsetLine = util$1.getArg(offset, 'line');
    var offsetColumn = util$1.getArg(offset, 'column');

    if (offsetLine < lastOffset.line ||
        (offsetLine === lastOffset.line && offsetColumn < lastOffset.column)) {
      throw new Error('Section offsets must be ordered and non-overlapping.');
    }
    lastOffset = offset;

    return {
      generatedOffset: {
        // The offset fields are 0-based, but we use 1-based indices when
        // encoding/decoding from VLQ.
        generatedLine: offsetLine + 1,
        generatedColumn: offsetColumn + 1
      },
      consumer: new SourceMapConsumer$2(util$1.getArg(s, 'map'), aSourceMapURL)
    }
  });
}

IndexedSourceMapConsumer.prototype = Object.create(SourceMapConsumer$2.prototype);
IndexedSourceMapConsumer.prototype.constructor = SourceMapConsumer$2;

/**
 * The version of the source mapping spec that we are consuming.
 */
IndexedSourceMapConsumer.prototype._version = 3;

/**
 * The list of original sources.
 */
Object.defineProperty(IndexedSourceMapConsumer.prototype, 'sources', {
  get: function () {
    var sources = [];
    for (var i = 0; i < this._sections.length; i++) {
      for (var j = 0; j < this._sections[i].consumer.sources.length; j++) {
        sources.push(this._sections[i].consumer.sources[j]);
      }
    }
    return sources;
  }
});

/**
 * Returns the original source, line, and column information for the generated
 * source's line and column positions provided. The only argument is an object
 * with the following properties:
 *
 *   - line: The line number in the generated source.  The line number
 *     is 1-based.
 *   - column: The column number in the generated source.  The column
 *     number is 0-based.
 *
 * and an object is returned with the following properties:
 *
 *   - source: The original source file, or null.
 *   - line: The line number in the original source, or null.  The
 *     line number is 1-based.
 *   - column: The column number in the original source, or null.  The
 *     column number is 0-based.
 *   - name: The original identifier, or null.
 */
IndexedSourceMapConsumer.prototype.originalPositionFor =
  function IndexedSourceMapConsumer_originalPositionFor(aArgs) {
    var needle = {
      generatedLine: util$1.getArg(aArgs, 'line'),
      generatedColumn: util$1.getArg(aArgs, 'column')
    };

    // Find the section containing the generated position we're trying to map
    // to an original position.
    var sectionIndex = binarySearch$1.search(needle, this._sections,
      function(needle, section) {
        var cmp = needle.generatedLine - section.generatedOffset.generatedLine;
        if (cmp) {
          return cmp;
        }

        return (needle.generatedColumn -
                section.generatedOffset.generatedColumn);
      });
    var section = this._sections[sectionIndex];

    if (!section) {
      return {
        source: null,
        line: null,
        column: null,
        name: null
      };
    }

    return section.consumer.originalPositionFor({
      line: needle.generatedLine -
        (section.generatedOffset.generatedLine - 1),
      column: needle.generatedColumn -
        (section.generatedOffset.generatedLine === needle.generatedLine
         ? section.generatedOffset.generatedColumn - 1
         : 0),
      bias: aArgs.bias
    });
  };

/**
 * Return true if we have the source content for every source in the source
 * map, false otherwise.
 */
IndexedSourceMapConsumer.prototype.hasContentsOfAllSources =
  function IndexedSourceMapConsumer_hasContentsOfAllSources() {
    return this._sections.every(function (s) {
      return s.consumer.hasContentsOfAllSources();
    });
  };

/**
 * Returns the original source content. The only argument is the url of the
 * original source file. Returns null if no original source content is
 * available.
 */
IndexedSourceMapConsumer.prototype.sourceContentFor =
  function IndexedSourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
    for (var i = 0; i < this._sections.length; i++) {
      var section = this._sections[i];

      var content = section.consumer.sourceContentFor(aSource, true);
      if (content) {
        return content;
      }
    }
    if (nullOnMissing) {
      return null;
    }
    else {
      throw new Error('"' + aSource + '" is not in the SourceMap.');
    }
  };

/**
 * Returns the generated line and column information for the original source,
 * line, and column positions provided. The only argument is an object with
 * the following properties:
 *
 *   - source: The filename of the original source.
 *   - line: The line number in the original source.  The line number
 *     is 1-based.
 *   - column: The column number in the original source.  The column
 *     number is 0-based.
 *
 * and an object is returned with the following properties:
 *
 *   - line: The line number in the generated source, or null.  The
 *     line number is 1-based. 
 *   - column: The column number in the generated source, or null.
 *     The column number is 0-based.
 */
IndexedSourceMapConsumer.prototype.generatedPositionFor =
  function IndexedSourceMapConsumer_generatedPositionFor(aArgs) {
    for (var i = 0; i < this._sections.length; i++) {
      var section = this._sections[i];

      // Only consider this section if the requested source is in the list of
      // sources of the consumer.
      if (section.consumer._findSourceIndex(util$1.getArg(aArgs, 'source')) === -1) {
        continue;
      }
      var generatedPosition = section.consumer.generatedPositionFor(aArgs);
      if (generatedPosition) {
        var ret = {
          line: generatedPosition.line +
            (section.generatedOffset.generatedLine - 1),
          column: generatedPosition.column +
            (section.generatedOffset.generatedLine === generatedPosition.line
             ? section.generatedOffset.generatedColumn - 1
             : 0)
        };
        return ret;
      }
    }

    return {
      line: null,
      column: null
    };
  };

/**
 * Parse the mappings in a string in to a data structure which we can easily
 * query (the ordered arrays in the `this.__generatedMappings` and
 * `this.__originalMappings` properties).
 */
IndexedSourceMapConsumer.prototype._parseMappings =
  function IndexedSourceMapConsumer_parseMappings(aStr, aSourceRoot) {
    this.__generatedMappings = [];
    this.__originalMappings = [];
    for (var i = 0; i < this._sections.length; i++) {
      var section = this._sections[i];
      var sectionMappings = section.consumer._generatedMappings;
      for (var j = 0; j < sectionMappings.length; j++) {
        var mapping = sectionMappings[j];

        var source = section.consumer._sources.at(mapping.source);
        source = util$1.computeSourceURL(section.consumer.sourceRoot, source, this._sourceMapURL);
        this._sources.add(source);
        source = this._sources.indexOf(source);

        var name = null;
        if (mapping.name) {
          name = section.consumer._names.at(mapping.name);
          this._names.add(name);
          name = this._names.indexOf(name);
        }

        // The mappings coming from the consumer for the section have
        // generated positions relative to the start of the section, so we
        // need to offset them to be relative to the start of the concatenated
        // generated file.
        var adjustedMapping = {
          source: source,
          generatedLine: mapping.generatedLine +
            (section.generatedOffset.generatedLine - 1),
          generatedColumn: mapping.generatedColumn +
            (section.generatedOffset.generatedLine === mapping.generatedLine
            ? section.generatedOffset.generatedColumn - 1
            : 0),
          originalLine: mapping.originalLine,
          originalColumn: mapping.originalColumn,
          name: name
        };

        this.__generatedMappings.push(adjustedMapping);
        if (typeof adjustedMapping.originalLine === 'number') {
          this.__originalMappings.push(adjustedMapping);
        }
      }
    }

    quickSort(this.__generatedMappings, util$1.compareByGeneratedPositionsDeflated);
    quickSort(this.__originalMappings, util$1.compareByOriginalPositions);
  };

sourceMapConsumer.IndexedSourceMapConsumer = IndexedSourceMapConsumer;

var sourceNode = {};

/* -*- Mode: js; js-indent-level: 2; -*- */

/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

var SourceMapGenerator$2 = sourceMapGenerator.SourceMapGenerator;
var util = util$5;

// Matches a Windows-style `\r\n` newline or a `\n` newline used by all other
// operating systems these days (capturing the result).
var REGEX_NEWLINE = /(\r?\n)/;

// Newline character code for charCodeAt() comparisons
var NEWLINE_CODE = 10;

// Private symbol for identifying `SourceNode`s when multiple versions of
// the source-map library are loaded. This MUST NOT CHANGE across
// versions!
var isSourceNode = "$$$isSourceNode$$$";

/**
 * SourceNodes provide a way to abstract over interpolating/concatenating
 * snippets of generated JavaScript source code while maintaining the line and
 * column information associated with the original source code.
 *
 * @param aLine The original line number.
 * @param aColumn The original column number.
 * @param aSource The original source's filename.
 * @param aChunks Optional. An array of strings which are snippets of
 *        generated JS, or other SourceNodes.
 * @param aName The original identifier.
 */
function SourceNode(aLine, aColumn, aSource, aChunks, aName) {
  this.children = [];
  this.sourceContents = {};
  this.line = aLine == null ? null : aLine;
  this.column = aColumn == null ? null : aColumn;
  this.source = aSource == null ? null : aSource;
  this.name = aName == null ? null : aName;
  this[isSourceNode] = true;
  if (aChunks != null) this.add(aChunks);
}

/**
 * Creates a SourceNode from generated code and a SourceMapConsumer.
 *
 * @param aGeneratedCode The generated code
 * @param aSourceMapConsumer The SourceMap for the generated code
 * @param aRelativePath Optional. The path that relative sources in the
 *        SourceMapConsumer should be relative to.
 */
SourceNode.fromStringWithSourceMap =
  function SourceNode_fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer, aRelativePath) {
    // The SourceNode we want to fill with the generated code
    // and the SourceMap
    var node = new SourceNode();

    // All even indices of this array are one line of the generated code,
    // while all odd indices are the newlines between two adjacent lines
    // (since `REGEX_NEWLINE` captures its match).
    // Processed fragments are accessed by calling `shiftNextLine`.
    var remainingLines = aGeneratedCode.split(REGEX_NEWLINE);
    var remainingLinesIndex = 0;
    var shiftNextLine = function() {
      var lineContents = getNextLine();
      // The last line of a file might not have a newline.
      var newLine = getNextLine() || "";
      return lineContents + newLine;

      function getNextLine() {
        return remainingLinesIndex < remainingLines.length ?
            remainingLines[remainingLinesIndex++] : undefined;
      }
    };

    // We need to remember the position of "remainingLines"
    var lastGeneratedLine = 1, lastGeneratedColumn = 0;

    // The generate SourceNodes we need a code range.
    // To extract it current and last mapping is used.
    // Here we store the last mapping.
    var lastMapping = null;

    aSourceMapConsumer.eachMapping(function (mapping) {
      if (lastMapping !== null) {
        // We add the code from "lastMapping" to "mapping":
        // First check if there is a new line in between.
        if (lastGeneratedLine < mapping.generatedLine) {
          // Associate first line with "lastMapping"
          addMappingWithCode(lastMapping, shiftNextLine());
          lastGeneratedLine++;
          lastGeneratedColumn = 0;
          // The remaining code is added without mapping
        } else {
          // There is no new line in between.
          // Associate the code between "lastGeneratedColumn" and
          // "mapping.generatedColumn" with "lastMapping"
          var nextLine = remainingLines[remainingLinesIndex] || '';
          var code = nextLine.substr(0, mapping.generatedColumn -
                                        lastGeneratedColumn);
          remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn -
                                              lastGeneratedColumn);
          lastGeneratedColumn = mapping.generatedColumn;
          addMappingWithCode(lastMapping, code);
          // No more remaining code, continue
          lastMapping = mapping;
          return;
        }
      }
      // We add the generated code until the first mapping
      // to the SourceNode without any mapping.
      // Each line is added as separate string.
      while (lastGeneratedLine < mapping.generatedLine) {
        node.add(shiftNextLine());
        lastGeneratedLine++;
      }
      if (lastGeneratedColumn < mapping.generatedColumn) {
        var nextLine = remainingLines[remainingLinesIndex] || '';
        node.add(nextLine.substr(0, mapping.generatedColumn));
        remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn);
        lastGeneratedColumn = mapping.generatedColumn;
      }
      lastMapping = mapping;
    }, this);
    // We have processed all mappings.
    if (remainingLinesIndex < remainingLines.length) {
      if (lastMapping) {
        // Associate the remaining code in the current line with "lastMapping"
        addMappingWithCode(lastMapping, shiftNextLine());
      }
      // and add the remaining lines without any mapping
      node.add(remainingLines.splice(remainingLinesIndex).join(""));
    }

    // Copy sourcesContent into SourceNode
    aSourceMapConsumer.sources.forEach(function (sourceFile) {
      var content = aSourceMapConsumer.sourceContentFor(sourceFile);
      if (content != null) {
        if (aRelativePath != null) {
          sourceFile = util.join(aRelativePath, sourceFile);
        }
        node.setSourceContent(sourceFile, content);
      }
    });

    return node;

    function addMappingWithCode(mapping, code) {
      if (mapping === null || mapping.source === undefined) {
        node.add(code);
      } else {
        var source = aRelativePath
          ? util.join(aRelativePath, mapping.source)
          : mapping.source;
        node.add(new SourceNode(mapping.originalLine,
                                mapping.originalColumn,
                                source,
                                code,
                                mapping.name));
      }
    }
  };

/**
 * Add a chunk of generated JS to this source node.
 *
 * @param aChunk A string snippet of generated JS code, another instance of
 *        SourceNode, or an array where each member is one of those things.
 */
SourceNode.prototype.add = function SourceNode_add(aChunk) {
  if (Array.isArray(aChunk)) {
    aChunk.forEach(function (chunk) {
      this.add(chunk);
    }, this);
  }
  else if (aChunk[isSourceNode] || typeof aChunk === "string") {
    if (aChunk) {
      this.children.push(aChunk);
    }
  }
  else {
    throw new TypeError(
      "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
    );
  }
  return this;
};

/**
 * Add a chunk of generated JS to the beginning of this source node.
 *
 * @param aChunk A string snippet of generated JS code, another instance of
 *        SourceNode, or an array where each member is one of those things.
 */
SourceNode.prototype.prepend = function SourceNode_prepend(aChunk) {
  if (Array.isArray(aChunk)) {
    for (var i = aChunk.length-1; i >= 0; i--) {
      this.prepend(aChunk[i]);
    }
  }
  else if (aChunk[isSourceNode] || typeof aChunk === "string") {
    this.children.unshift(aChunk);
  }
  else {
    throw new TypeError(
      "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
    );
  }
  return this;
};

/**
 * Walk over the tree of JS snippets in this node and its children. The
 * walking function is called once for each snippet of JS and is passed that
 * snippet and the its original associated source's line/column location.
 *
 * @param aFn The traversal function.
 */
SourceNode.prototype.walk = function SourceNode_walk(aFn) {
  var chunk;
  for (var i = 0, len = this.children.length; i < len; i++) {
    chunk = this.children[i];
    if (chunk[isSourceNode]) {
      chunk.walk(aFn);
    }
    else {
      if (chunk !== '') {
        aFn(chunk, { source: this.source,
                     line: this.line,
                     column: this.column,
                     name: this.name });
      }
    }
  }
};

/**
 * Like `String.prototype.join` except for SourceNodes. Inserts `aStr` between
 * each of `this.children`.
 *
 * @param aSep The separator.
 */
SourceNode.prototype.join = function SourceNode_join(aSep) {
  var newChildren;
  var i;
  var len = this.children.length;
  if (len > 0) {
    newChildren = [];
    for (i = 0; i < len-1; i++) {
      newChildren.push(this.children[i]);
      newChildren.push(aSep);
    }
    newChildren.push(this.children[i]);
    this.children = newChildren;
  }
  return this;
};

/**
 * Call String.prototype.replace on the very right-most source snippet. Useful
 * for trimming whitespace from the end of a source node, etc.
 *
 * @param aPattern The pattern to replace.
 * @param aReplacement The thing to replace the pattern with.
 */
SourceNode.prototype.replaceRight = function SourceNode_replaceRight(aPattern, aReplacement) {
  var lastChild = this.children[this.children.length - 1];
  if (lastChild[isSourceNode]) {
    lastChild.replaceRight(aPattern, aReplacement);
  }
  else if (typeof lastChild === 'string') {
    this.children[this.children.length - 1] = lastChild.replace(aPattern, aReplacement);
  }
  else {
    this.children.push(''.replace(aPattern, aReplacement));
  }
  return this;
};

/**
 * Set the source content for a source file. This will be added to the SourceMapGenerator
 * in the sourcesContent field.
 *
 * @param aSourceFile The filename of the source file
 * @param aSourceContent The content of the source file
 */
SourceNode.prototype.setSourceContent =
  function SourceNode_setSourceContent(aSourceFile, aSourceContent) {
    this.sourceContents[util.toSetString(aSourceFile)] = aSourceContent;
  };

/**
 * Walk over the tree of SourceNodes. The walking function is called for each
 * source file content and is passed the filename and source content.
 *
 * @param aFn The traversal function.
 */
SourceNode.prototype.walkSourceContents =
  function SourceNode_walkSourceContents(aFn) {
    for (var i = 0, len = this.children.length; i < len; i++) {
      if (this.children[i][isSourceNode]) {
        this.children[i].walkSourceContents(aFn);
      }
    }

    var sources = Object.keys(this.sourceContents);
    for (var i = 0, len = sources.length; i < len; i++) {
      aFn(util.fromSetString(sources[i]), this.sourceContents[sources[i]]);
    }
  };

/**
 * Return the string representation of this source node. Walks over the tree
 * and concatenates all the various snippets together to one string.
 */
SourceNode.prototype.toString = function SourceNode_toString() {
  var str = "";
  this.walk(function (chunk) {
    str += chunk;
  });
  return str;
};

/**
 * Returns the string representation of this source node along with a source
 * map.
 */
SourceNode.prototype.toStringWithSourceMap = function SourceNode_toStringWithSourceMap(aArgs) {
  var generated = {
    code: "",
    line: 1,
    column: 0
  };
  var map = new SourceMapGenerator$2(aArgs);
  var sourceMappingActive = false;
  var lastOriginalSource = null;
  var lastOriginalLine = null;
  var lastOriginalColumn = null;
  var lastOriginalName = null;
  this.walk(function (chunk, original) {
    generated.code += chunk;
    if (original.source !== null
        && original.line !== null
        && original.column !== null) {
      if(lastOriginalSource !== original.source
         || lastOriginalLine !== original.line
         || lastOriginalColumn !== original.column
         || lastOriginalName !== original.name) {
        map.addMapping({
          source: original.source,
          original: {
            line: original.line,
            column: original.column
          },
          generated: {
            line: generated.line,
            column: generated.column
          },
          name: original.name
        });
      }
      lastOriginalSource = original.source;
      lastOriginalLine = original.line;
      lastOriginalColumn = original.column;
      lastOriginalName = original.name;
      sourceMappingActive = true;
    } else if (sourceMappingActive) {
      map.addMapping({
        generated: {
          line: generated.line,
          column: generated.column
        }
      });
      lastOriginalSource = null;
      sourceMappingActive = false;
    }
    for (var idx = 0, length = chunk.length; idx < length; idx++) {
      if (chunk.charCodeAt(idx) === NEWLINE_CODE) {
        generated.line++;
        generated.column = 0;
        // Mappings end at eol
        if (idx + 1 === length) {
          lastOriginalSource = null;
          sourceMappingActive = false;
        } else if (sourceMappingActive) {
          map.addMapping({
            source: original.source,
            original: {
              line: original.line,
              column: original.column
            },
            generated: {
              line: generated.line,
              column: generated.column
            },
            name: original.name
          });
        }
      } else {
        generated.column++;
      }
    }
  });
  this.walkSourceContents(function (sourceFile, sourceContent) {
    map.setSourceContent(sourceFile, sourceContent);
  });

  return { code: generated.code, map: map };
};

sourceNode.SourceNode = SourceNode;

/*
 * Copyright 2009-2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE.txt or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

sourceMap.SourceMapGenerator = sourceMapGenerator.SourceMapGenerator;
sourceMap.SourceMapConsumer = sourceMapConsumer.SourceMapConsumer;
sourceMap.SourceNode = sourceNode.SourceNode;

var SourceMapConsumer$1 = sourceMap.SourceMapConsumer;

function inputSourceMapTracker$1() {
  var maps = {};

  return {
    all: all$2.bind(null, maps),
    isTracking: isTracking.bind(null, maps),
    originalPositionFor: originalPositionFor$1.bind(null, maps),
    track: track$2.bind(null, maps)
  };
}

function all$2(maps) {
  return maps;
}

function isTracking(maps, source) {
  return source in maps;
}

function originalPositionFor$1(maps, metadata, range, selectorFallbacks) {
  var line = metadata[0];
  var column = metadata[1];
  var source = metadata[2];
  var position = {
    line: line,
    column: column + range
  };
  var originalPosition;

  while (!originalPosition && position.column > column) {
    position.column--;
    originalPosition = maps[source].originalPositionFor(position);
  }

  if (!originalPosition || originalPosition.column < 0) {
    return metadata;
  }

  if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
    return originalPositionFor$1(maps, [line - 1, column, source], range, selectorFallbacks - 1);
  }

  return originalPosition.line !== null ?
    toMetadata(originalPosition) :
    metadata;
}

function toMetadata(asHash) {
  return [asHash.line, asHash.column, asHash.source];
}

function track$2(maps, source, data) {
  maps[source] = new SourceMapConsumer$1(data);
}

var inputSourceMapTracker_1 = inputSourceMapTracker$1;

var _polyfillNode_fs = {};

var _polyfillNode_fs$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	default: _polyfillNode_fs
});

var require$$0 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_fs$1);

var REMOTE_RESOURCE_PATTERN = /^(\w+:\/\/|\/\/)/;

function isRemoteResource$5(uri) {
  return REMOTE_RESOURCE_PATTERN.test(uri);
}

var isRemoteResource_1 = isRemoteResource$5;

var NO_PROTOCOL_RESOURCE_PATTERN = /^\/\//;

function hasProtocol$4(uri) {
  return !NO_PROTOCOL_RESOURCE_PATTERN.test(uri);
}

var hasProtocol_1 = hasProtocol$4;

var path$8 = require$$1;
var url$2 = require$$0$1;

var isRemoteResource$4 = isRemoteResource_1;
var hasProtocol$3 = hasProtocol_1;

var HTTP_PROTOCOL = 'http:';

function isAllowedResource$3(uri, isRemote, rules) {
  var match;
  var absoluteUri;
  var allowed = isRemote ? false : true;
  var rule;
  var isNegated;
  var normalizedRule;
  var i;

  if (rules.length === 0) {
    return false;
  }

  if (isRemote && !hasProtocol$3(uri)) {
    uri = HTTP_PROTOCOL + uri;
  }

  match = isRemote ?
    url$2.parse(uri).host :
    uri;

  absoluteUri = isRemote ?
    uri :
    path$8.resolve(uri);

  for (i = 0; i < rules.length; i++) {
    rule = rules[i];
    isNegated = rule[0] == '!';
    normalizedRule = rule.substring(1);

    if (isNegated && isRemote && isRemoteRule(normalizedRule)) {
      allowed = allowed && !isAllowedResource$3(uri, true, [normalizedRule]);
    } else if (isNegated && !isRemote && !isRemoteRule(normalizedRule)) {
      allowed = allowed && !isAllowedResource$3(uri, false, [normalizedRule]);
    } else if (isNegated) {
      allowed = allowed && true;
    } else if (rule == 'all') {
      allowed = true;
    } else if (isRemote && rule == 'local') {
      allowed = allowed || false;
    } else if (isRemote && rule == 'remote') {
      allowed = true;
    } else if (!isRemote && rule == 'remote') {
      allowed = false;
    } else if (!isRemote && rule == 'local') {
      allowed = true;
    } else if (rule === match) {
      allowed = true;
    } else if (rule === uri) {
      allowed = true;
    } else if (isRemote && absoluteUri.indexOf(rule) === 0) {
      allowed = true;
    } else if (!isRemote && absoluteUri.indexOf(path$8.resolve(rule)) === 0) {
      allowed = true;
    } else if (isRemote != isRemoteRule(normalizedRule)) {
      allowed = allowed && true;
    } else {
      allowed = false;
    }
  }

  return allowed;
}

function isRemoteRule(rule) {
  return isRemoteResource$4(rule) || url$2.parse(HTTP_PROTOCOL + '//' + rule).host == rule;
}

var isAllowedResource_1 = isAllowedResource$3;

var DATA_URI_PATTERN$1 = /^data:(\S*?)?(;charset=[^;]+)?(;[^,]+?)?,(.+)/;

function matchDataUri$1(uri) {
  return DATA_URI_PATTERN$1.exec(uri);
}

var matchDataUri_1 = matchDataUri$1;

var path$7 = require$$1;

function rebaseLocalMap$2(sourceMap, sourceUri, rebaseTo) {
  var currentPath = path$7.resolve('');
  var absoluteUri = path$7.resolve(currentPath, sourceUri);
  var absoluteUriDirectory = path$7.dirname(absoluteUri);

  sourceMap.sources = sourceMap.sources.map(function(source) {
    return path$7.relative(rebaseTo, path$7.resolve(absoluteUriDirectory, source));
  });

  return sourceMap;
}

var rebaseLocalMap_1 = rebaseLocalMap$2;

var path$6 = require$$1;
var url$1 = require$$0$1;

function rebaseRemoteMap$2(sourceMap, sourceUri) {
  var sourceDirectory = path$6.dirname(sourceUri);

  sourceMap.sources = sourceMap.sources.map(function(source) {
    return url$1.resolve(sourceDirectory, source);
  });

  return sourceMap;
}

var rebaseRemoteMap_1 = rebaseRemoteMap$2;

var DATA_URI_PATTERN = /^data:(\S*?)?(;charset=[^;]+)?(;[^,]+?)?,(.+)/;

function isDataUriResource$2(uri) {
  return DATA_URI_PATTERN.test(uri);
}

var isDataUriResource_1 = isDataUriResource$2;

var fs$2 = require$$0;
var path$5 = require$$1;

var isAllowedResource$2 = isAllowedResource_1;
var matchDataUri = matchDataUri_1;
var rebaseLocalMap$1 = rebaseLocalMap_1;
var rebaseRemoteMap$1 = rebaseRemoteMap_1;

var Token$3 = token;
var hasProtocol$2 = hasProtocol_1;
var isDataUriResource$1 = isDataUriResource_1;
var isRemoteResource$3 = isRemoteResource_1;

var MAP_MARKER_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;

function applySourceMaps$1(tokens, context, callback) {
  var applyContext = {
    callback: callback,
    fetch: context.options.fetch,
    index: 0,
    inline: context.options.inline,
    inlineRequest: context.options.inlineRequest,
    inlineTimeout: context.options.inlineTimeout,
    inputSourceMapTracker: context.inputSourceMapTracker,
    localOnly: context.localOnly,
    processedTokens: [],
    rebaseTo: context.options.rebaseTo,
    sourceTokens: tokens,
    warnings: context.warnings
  };

  return context.options.sourceMap && tokens.length > 0 ?
    doApplySourceMaps(applyContext) :
    callback(tokens);
}

function doApplySourceMaps(applyContext) {
  var singleSourceTokens = [];
  var lastSource = findTokenSource(applyContext.sourceTokens[0]);
  var source;
  var token;
  var l;

  for (l = applyContext.sourceTokens.length; applyContext.index < l; applyContext.index++) {
    token = applyContext.sourceTokens[applyContext.index];
    source = findTokenSource(token);

    if (source != lastSource) {
      singleSourceTokens = [];
      lastSource = source;
    }

    singleSourceTokens.push(token);
    applyContext.processedTokens.push(token);

    if (token[0] == Token$3.COMMENT && MAP_MARKER_PATTERN.test(token[1])) {
      return fetchAndApplySourceMap(token[1], source, singleSourceTokens, applyContext);
    }
  }

  return applyContext.callback(applyContext.processedTokens);
}

function findTokenSource(token) {
  var scope;
  var metadata;

  if (token[0] == Token$3.AT_RULE || token[0] == Token$3.COMMENT || token[0] == Token$3.RAW) {
    metadata = token[2][0];
  } else {
    scope = token[1][0];
    metadata = scope[2][0];
  }

  return metadata[2];
}

function fetchAndApplySourceMap(sourceMapComment, source, singleSourceTokens, applyContext) {
  return extractInputSourceMapFrom(sourceMapComment, applyContext, function (inputSourceMap) {
    if (inputSourceMap) {
      applyContext.inputSourceMapTracker.track(source, inputSourceMap);
      applySourceMapRecursively(singleSourceTokens, applyContext.inputSourceMapTracker);
    }

    applyContext.index++;
    return doApplySourceMaps(applyContext);
  });
}

function extractInputSourceMapFrom(sourceMapComment, applyContext, whenSourceMapReady) {
  var uri = MAP_MARKER_PATTERN.exec(sourceMapComment)[1];
  var absoluteUri;
  var sourceMap;
  var rebasedMap;

  if (isDataUriResource$1(uri)) {
    sourceMap = extractInputSourceMapFromDataUri(uri);
    return whenSourceMapReady(sourceMap);
  } else if (isRemoteResource$3(uri)) {
    return loadInputSourceMapFromRemoteUri(uri, applyContext, function (sourceMap) {
      var parsedMap;

      if (sourceMap) {
        parsedMap = JSON.parse(sourceMap);
        rebasedMap = rebaseRemoteMap$1(parsedMap, uri);
        whenSourceMapReady(rebasedMap);
      } else {
        whenSourceMapReady(null);
      }
    });
  } else {
    // at this point `uri` is already rebased, see lib/reader/rebase.js#rebaseSourceMapComment
    // it is rebased to be consistent with rebasing other URIs
    // however here we need to resolve it back to read it from disk
    absoluteUri = path$5.resolve(applyContext.rebaseTo, uri);
    sourceMap = loadInputSourceMapFromLocalUri(absoluteUri, applyContext);

    if (sourceMap) {
      rebasedMap = rebaseLocalMap$1(sourceMap, absoluteUri, applyContext.rebaseTo);
      return whenSourceMapReady(rebasedMap);
    } else {
      return whenSourceMapReady(null);
    }
  }
}

function extractInputSourceMapFromDataUri(uri) {
  var dataUriMatch = matchDataUri(uri);
  var charset = dataUriMatch[2] ? dataUriMatch[2].split(/[=;]/)[2] : 'us-ascii';
  var encoding = dataUriMatch[3] ? dataUriMatch[3].split(';')[1] : 'utf8';
  var data = encoding == 'utf8' ? commonjsGlobal.unescape(dataUriMatch[4]) : dataUriMatch[4];

  var buffer = Buffer$1.from(data, encoding);
  buffer.charset = charset;

  return JSON.parse(buffer.toString());
}

function loadInputSourceMapFromRemoteUri(uri, applyContext, whenLoaded) {
  var isAllowed = isAllowedResource$2(uri, true, applyContext.inline);
  var isRuntimeResource = !hasProtocol$2(uri);

  if (applyContext.localOnly) {
    applyContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
    return whenLoaded(null);
  } else if (isRuntimeResource) {
    applyContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
    return whenLoaded(null);
  } else if (!isAllowed) {
    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
    return whenLoaded(null);
  }

  applyContext.fetch(uri, applyContext.inlineRequest, applyContext.inlineTimeout, function (error, body) {
    if (error) {
      applyContext.warnings.push('Missing source map at "' + uri + '" - ' + error);
      return whenLoaded(null);
    }

    whenLoaded(body);
  });
}

function loadInputSourceMapFromLocalUri(uri, applyContext) {
  var isAllowed = isAllowedResource$2(uri, false, applyContext.inline);
  var sourceMap;

  if (!fs$2.existsSync(uri) || !fs$2.statSync(uri).isFile()) {
    applyContext.warnings.push('Ignoring local source map at "' + uri + '" as resource is missing.');
    return null;
  } else if (!isAllowed) {
    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
    return null;
  }

  sourceMap = fs$2.readFileSync(uri, 'utf-8');
  return JSON.parse(sourceMap);
}

function applySourceMapRecursively(tokens, inputSourceMapTracker) {
  var token;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];

    switch (token[0]) {
      case Token$3.AT_RULE:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.AT_RULE_BLOCK:
        applySourceMapRecursively(token[1], inputSourceMapTracker);
        applySourceMapRecursively(token[2], inputSourceMapTracker);
        break;
      case Token$3.AT_RULE_BLOCK_SCOPE:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.NESTED_BLOCK:
        applySourceMapRecursively(token[1], inputSourceMapTracker);
        applySourceMapRecursively(token[2], inputSourceMapTracker);
        break;
      case Token$3.NESTED_BLOCK_SCOPE:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.COMMENT:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.PROPERTY:
        applySourceMapRecursively(token, inputSourceMapTracker);
        break;
      case Token$3.PROPERTY_BLOCK:
        applySourceMapRecursively(token[1], inputSourceMapTracker);
        break;
      case Token$3.PROPERTY_NAME:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.PROPERTY_VALUE:
        applySourceMapTo(token, inputSourceMapTracker);
        break;
      case Token$3.RULE:
        applySourceMapRecursively(token[1], inputSourceMapTracker);
        applySourceMapRecursively(token[2], inputSourceMapTracker);
        break;
      case Token$3.RULE_SCOPE:
        applySourceMapTo(token, inputSourceMapTracker);
    }
  }

  return tokens;
}

function applySourceMapTo(token, inputSourceMapTracker) {
  var value = token[1];
  var metadata = token[2];
  var newMetadata = [];
  var i, l;

  for (i = 0, l = metadata.length; i < l; i++) {
    newMetadata.push(inputSourceMapTracker.originalPositionFor(metadata[i], value.length));
  }

  token[2] = newMetadata;
}

var applySourceMaps_1 = applySourceMaps$1;

var split = split_1;

var BRACE_PREFIX = /^\(/;
var BRACE_SUFFIX = /\)$/;
var IMPORT_PREFIX_PATTERN$1 = /^@import/i;
var QUOTE_PREFIX_PATTERN$1 = /['"]\s*/;
var QUOTE_SUFFIX_PATTERN$1 = /\s*['"]/;
var URL_PREFIX_PATTERN$1 = /^url\(\s*/i;
var URL_SUFFIX_PATTERN$1 = /\s*\)/i;

function extractImportUrlAndMedia$2(atRuleValue) {
  var uri;
  var mediaQuery;
  var stripped;
  var parts;

  stripped = atRuleValue
    .replace(IMPORT_PREFIX_PATTERN$1, '')
    .trim()
    .replace(URL_PREFIX_PATTERN$1, '(')
    .replace(URL_SUFFIX_PATTERN$1, ')')
    .replace(QUOTE_PREFIX_PATTERN$1, '')
    .replace(QUOTE_SUFFIX_PATTERN$1, '');

  parts = split(stripped, ' ');

  uri = parts[0]
    .replace(BRACE_PREFIX, '')
    .replace(BRACE_SUFFIX, '');
  mediaQuery = parts.slice(1).join(' ');

  return [uri, mediaQuery];
}

var extractImportUrlAndMedia_1 = extractImportUrlAndMedia$2;

var fs$1 = require$$0;
var path$4 = require$$1;

var isAllowedResource$1 = isAllowedResource_1;

var hasProtocol$1 = hasProtocol_1;
var isRemoteResource$2 = isRemoteResource_1;

function loadOriginalSources$1(context, callback) {
  var loadContext = {
    callback: callback,
    fetch: context.options.fetch,
    index: 0,
    inline: context.options.inline,
    inlineRequest: context.options.inlineRequest,
    inlineTimeout: context.options.inlineTimeout,
    localOnly: context.localOnly,
    rebaseTo: context.options.rebaseTo,
    sourcesContent: context.sourcesContent,
    uriToSource: uriToSourceMapping(context.inputSourceMapTracker.all()),
    warnings: context.warnings
  };

  return context.options.sourceMap && context.options.sourceMapInlineSources ?
    doLoadOriginalSources(loadContext) :
    callback();
}

function uriToSourceMapping(allSourceMapConsumers) {
  var mapping = {};
  var consumer;
  var uri;
  var source;
  var i, l;

  for (source in allSourceMapConsumers) {
    consumer = allSourceMapConsumers[source];

    for (i = 0, l = consumer.sources.length; i < l; i++) {
      uri = consumer.sources[i];
      source = consumer.sourceContentFor(uri, true);

      mapping[uri] = source;
    }
  }

  return mapping;
}

function doLoadOriginalSources(loadContext) {
  var uris = Object.keys(loadContext.uriToSource);
  var uri;
  var source;
  var total;

  for (total = uris.length; loadContext.index < total; loadContext.index++) {
    uri = uris[loadContext.index];
    source = loadContext.uriToSource[uri];

    if (source) {
      loadContext.sourcesContent[uri] = source;
    } else {
      return loadOriginalSource(uri, loadContext);
    }
  }

  return loadContext.callback();
}

function loadOriginalSource(uri, loadContext) {
  var content;

  if (isRemoteResource$2(uri)) {
    return loadOriginalSourceFromRemoteUri(uri, loadContext, function (content) {
      loadContext.index++;
      loadContext.sourcesContent[uri] = content;
      return doLoadOriginalSources(loadContext);
    });
  } else {
    content = loadOriginalSourceFromLocalUri(uri, loadContext);
    loadContext.index++;
    loadContext.sourcesContent[uri] = content;
    return doLoadOriginalSources(loadContext);
  }
}

function loadOriginalSourceFromRemoteUri(uri, loadContext, whenLoaded) {
  var isAllowed = isAllowedResource$1(uri, true, loadContext.inline);
  var isRuntimeResource = !hasProtocol$1(uri);

  if (loadContext.localOnly) {
    loadContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
    return whenLoaded(null);
  } else if (isRuntimeResource) {
    loadContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
    return whenLoaded(null);
  } else if (!isAllowed) {
    loadContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
    return whenLoaded(null);
  }

  loadContext.fetch(uri, loadContext.inlineRequest, loadContext.inlineTimeout, function (error, content) {
    if (error) {
      loadContext.warnings.push('Missing original source at "' + uri + '" - ' + error);
    }

    whenLoaded(content);
  });
}

function loadOriginalSourceFromLocalUri(relativeUri, loadContext) {
  var isAllowed = isAllowedResource$1(relativeUri, false, loadContext.inline);
  var absoluteUri = path$4.resolve(loadContext.rebaseTo, relativeUri);

  if (!fs$1.existsSync(absoluteUri) || !fs$1.statSync(absoluteUri).isFile()) {
    loadContext.warnings.push('Ignoring local source map at "' + absoluteUri + '" as resource is missing.');
    return null;
  } else if (!isAllowed) {
    loadContext.warnings.push('Cannot fetch "' + absoluteUri + '" as resource is not allowed.');
    return null;
  }

  return fs$1.readFileSync(absoluteUri, 'utf8');
}

var loadOriginalSources_1 = loadOriginalSources$1;

var UNIX_SEPARATOR = '/';
var WINDOWS_SEPARATOR_PATTERN = /\\/g;

function normalizePath$2(path) {
  return path.replace(WINDOWS_SEPARATOR_PATTERN, UNIX_SEPARATOR);
}

var normalizePath_1 = normalizePath$2;

function restoreImport$2(uri, mediaQuery) {
  return ('@import ' + uri + ' ' + mediaQuery).trim();
}

var restoreImport_1 = restoreImport$2;

var path$3 = require$$1;
var url = require$$0$1;

var isDataUriResource = isDataUriResource_1;

var DOUBLE_QUOTE = '"';
var SINGLE_QUOTE = '\'';
var URL_PREFIX = 'url(';
var URL_SUFFIX = ')';

var PROTOCOL_LESS_PREFIX_PATTERN = /^[^\w\d]*\/\//;
var QUOTE_PREFIX_PATTERN = /^["']/;
var QUOTE_SUFFIX_PATTERN = /["']$/;
var ROUND_BRACKETS_PATTERN = /[\(\)]/;
var URL_PREFIX_PATTERN = /^url\(/i;
var URL_SUFFIX_PATTERN = /\)$/;
var WHITESPACE_PATTERN = /\s/;

var isWindows$1 = browser$1.platform == 'win32';

function rebase$2(uri, rebaseConfig) {
  if (!rebaseConfig) {
    return uri;
  }

  if (isAbsolute(uri) && !isRemote(rebaseConfig.toBase)) {
    return uri;
  }

  if (isRemote(uri) || isSVGMarker(uri) || isInternal(uri) || isDataUriResource(uri)) {
    return uri;
  }

  if (isRemote(rebaseConfig.toBase)) {
    return url.resolve(rebaseConfig.toBase, uri);
  }

  return rebaseConfig.absolute ?
    normalize(absolute(uri, rebaseConfig)) :
    normalize(relative(uri, rebaseConfig));
}

function isAbsolute(uri) {
  return path$3.isAbsolute(uri);
}

function isSVGMarker(uri) {
  return uri[0] == '#';
}

function isInternal(uri) {
  return /^\w+:\w+/.test(uri);
}

function isRemote(uri) {
  return /^[^:]+?:\/\//.test(uri) || PROTOCOL_LESS_PREFIX_PATTERN.test(uri);
}

function absolute(uri, rebaseConfig) {
  return path$3
    .resolve(path$3.join(rebaseConfig.fromBase || '', uri))
    .replace(rebaseConfig.toBase, '');
}

function relative(uri, rebaseConfig) {
  return path$3.relative(rebaseConfig.toBase, path$3.join(rebaseConfig.fromBase || '', uri));
}

function normalize(uri) {
  return isWindows$1 ? uri.replace(/\\/g, '/') : uri;
}

function quoteFor(unquotedUrl) {
  if (unquotedUrl.indexOf(SINGLE_QUOTE) > -1) {
    return DOUBLE_QUOTE;
  } else if (unquotedUrl.indexOf(DOUBLE_QUOTE) > -1) {
    return SINGLE_QUOTE;
  } else if (hasWhitespace(unquotedUrl) || hasRoundBrackets(unquotedUrl)) {
    return SINGLE_QUOTE;
  } else {
    return '';
  }
}

function hasWhitespace(url) {
  return WHITESPACE_PATTERN.test(url);
}

function hasRoundBrackets(url) {
  return ROUND_BRACKETS_PATTERN.test(url);
}

function rewriteUrl$1(originalUrl, rebaseConfig, pathOnly) {
  var strippedUrl = originalUrl
    .replace(URL_PREFIX_PATTERN, '')
    .replace(URL_SUFFIX_PATTERN, '')
    .trim();

  var unquotedUrl = strippedUrl
    .replace(QUOTE_PREFIX_PATTERN, '')
    .replace(QUOTE_SUFFIX_PATTERN, '')
    .trim();

  var quote = strippedUrl[0] == SINGLE_QUOTE || strippedUrl[0] == DOUBLE_QUOTE ?
    strippedUrl[0] :
    quoteFor(unquotedUrl);

  return pathOnly ?
    rebase$2(unquotedUrl, rebaseConfig) :
    URL_PREFIX + quote + rebase$2(unquotedUrl, rebaseConfig) + quote + URL_SUFFIX;
}

var rewriteUrl_1 = rewriteUrl$1;

var IMPORT_PREFIX_PATTERN = /^@import/i;

function isImport$2(value) {
  return IMPORT_PREFIX_PATTERN.test(value);
}

var isImport_1 = isImport$2;

var extractImportUrlAndMedia$1 = extractImportUrlAndMedia_1;
var restoreImport$1 = restoreImport_1;
var rewriteUrl = rewriteUrl_1;

var Token$2 = token;
var isImport$1 = isImport_1;

var SOURCE_MAP_COMMENT_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;

function rebase$1(tokens, rebaseAll, validator, rebaseConfig) {
  return rebaseAll ?
    rebaseEverything(tokens, validator, rebaseConfig) :
    rebaseAtRules(tokens, validator, rebaseConfig);
}

function rebaseEverything(tokens, validator, rebaseConfig) {
  var token;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];

    switch (token[0]) {
      case Token$2.AT_RULE:
        rebaseAtRule(token, validator, rebaseConfig);
        break;
      case Token$2.AT_RULE_BLOCK:
        rebaseProperties(token[2], validator, rebaseConfig);
        break;
      case Token$2.COMMENT:
        rebaseSourceMapComment(token, rebaseConfig);
        break;
      case Token$2.NESTED_BLOCK:
        rebaseEverything(token[2], validator, rebaseConfig);
        break;
      case Token$2.RULE:
        rebaseProperties(token[2], validator, rebaseConfig);
        break;
    }
  }

  return tokens;
}

function rebaseAtRules(tokens, validator, rebaseConfig) {
  var token;
  var i, l;

  for (i = 0, l = tokens.length; i < l; i++) {
    token = tokens[i];

    switch (token[0]) {
      case Token$2.AT_RULE:
        rebaseAtRule(token, validator, rebaseConfig);
        break;
    }
  }

  return tokens;
}

function rebaseAtRule(token, validator, rebaseConfig) {
  if (!isImport$1(token[1])) {
    return;
  }

  var uriAndMediaQuery = extractImportUrlAndMedia$1(token[1]);
  var newUrl = rewriteUrl(uriAndMediaQuery[0], rebaseConfig);
  var mediaQuery = uriAndMediaQuery[1];

  token[1] = restoreImport$1(newUrl, mediaQuery);
}

function rebaseSourceMapComment(token, rebaseConfig) {
  var matches = SOURCE_MAP_COMMENT_PATTERN.exec(token[1]);

  if (matches && matches[1].indexOf('data:') === -1) {
    token[1] = token[1].replace(matches[1], rewriteUrl(matches[1], rebaseConfig, true));
  }
}

function rebaseProperties(properties, validator, rebaseConfig) {
  var property;
  var value;
  var i, l;
  var j, m;

  for (i = 0, l = properties.length; i < l; i++) {
    property = properties[i];

    for (j = 2 /* 0 is Token.PROPERTY, 1 is name */, m = property.length; j < m; j++) {
      value = property[j][1];

      if (validator.isUrl(value)) {
        property[j][1] = rewriteUrl(value, rebaseConfig);
      }
    }
  }
}

var rebase_1 = rebase$1;

var Marker$1 = marker;
var Token$1 = token;

var formatPosition = formatPosition_1;

var Level = {
  BLOCK: 'block',
  COMMENT: 'comment',
  DOUBLE_QUOTE: 'double-quote',
  RULE: 'rule',
  SINGLE_QUOTE: 'single-quote'
};

var AT_RULES = [
  '@charset',
  '@import'
];

var BLOCK_RULES = [
  '@-moz-document',
  '@document',
  '@-moz-keyframes',
  '@-ms-keyframes',
  '@-o-keyframes',
  '@-webkit-keyframes',
  '@keyframes',
  '@media',
  '@supports'
];

var IGNORE_END_COMMENT_PATTERN = /\/\* clean\-css ignore:end \*\/$/;
var IGNORE_START_COMMENT_PATTERN = /^\/\* clean\-css ignore:start \*\//;

var PAGE_MARGIN_BOXES = [
  '@bottom-center',
  '@bottom-left',
  '@bottom-left-corner',
  '@bottom-right',
  '@bottom-right-corner',
  '@left-bottom',
  '@left-middle',
  '@left-top',
  '@right-bottom',
  '@right-middle',
  '@right-top',
  '@top-center',
  '@top-left',
  '@top-left-corner',
  '@top-right',
  '@top-right-corner'
];

var EXTRA_PAGE_BOXES = [
  '@footnote',
  '@footnotes',
  '@left',
  '@page-float-bottom',
  '@page-float-top',
  '@right'
];

var REPEAT_PATTERN = /^\[\s{0,31}\d+\s{0,31}\]$/;
var RULE_WORD_SEPARATOR_PATTERN = /[\s\(]/;
var TAIL_BROKEN_VALUE_PATTERN = /[\s|\}]*$/;

function tokenize$1(source, externalContext) {
  var internalContext = {
    level: Level.BLOCK,
    position: {
      source: externalContext.source || undefined,
      line: 1,
      column: 0,
      index: 0
    }
  };

  return intoTokens(source, externalContext, internalContext, false);
}

function intoTokens(source, externalContext, internalContext, isNested) {
  var allTokens = [];
  var newTokens = allTokens;
  var lastToken;
  var ruleToken;
  var ruleTokens = [];
  var propertyToken;
  var metadata;
  var metadatas = [];
  var level = internalContext.level;
  var levels = [];
  var buffer = [];
  var buffers = [];
  var isBufferEmpty = true;
  var serializedBuffer;
  var serializedBufferPart;
  var roundBracketLevel = 0;
  var isQuoted;
  var isSpace;
  var isNewLineNix;
  var isNewLineWin;
  var isCarriageReturn;
  var isCommentStart;
  var wasCommentStart = false;
  var isCommentEnd;
  var wasCommentEnd = false;
  var isCommentEndMarker;
  var isEscaped;
  var wasEscaped = false;
  var characterWithNoSpecialMeaning;
  var isPreviousDash = false;
  var isVariable = false;
  var isRaw = false;
  var seekingValue = false;
  var seekingPropertyBlockClosing = false;
  var position = internalContext.position;
  var lastCommentStartAt;

  for (; position.index < source.length; position.index++) {
    var character = source[position.index];

    isQuoted = level == Level.SINGLE_QUOTE || level == Level.DOUBLE_QUOTE;
    isSpace = character == Marker$1.SPACE || character == Marker$1.TAB;
    isNewLineNix = character == Marker$1.NEW_LINE_NIX;
    isNewLineWin = character == Marker$1.NEW_LINE_NIX && source[position.index - 1] == Marker$1.CARRIAGE_RETURN;
    isCarriageReturn = character == Marker$1.CARRIAGE_RETURN && source[position.index + 1] && source[position.index + 1] != Marker$1.NEW_LINE_NIX;
    isCommentStart = !wasCommentEnd && level != Level.COMMENT && !isQuoted && character == Marker$1.ASTERISK && source[position.index - 1] == Marker$1.FORWARD_SLASH;
    isCommentEndMarker = !wasCommentStart && !isQuoted && character == Marker$1.FORWARD_SLASH && source[position.index - 1] == Marker$1.ASTERISK;
    isCommentEnd = level == Level.COMMENT && isCommentEndMarker;
    characterWithNoSpecialMeaning = !isSpace && !isCarriageReturn && (character >= 'A' && character <= 'Z' || character >= 'a' && character <= 'z' || character >= '0' && character <= '9' || character == '-');
    isVariable = isVariable || (!seekingValue && isPreviousDash && character === '-');
    isPreviousDash = character === '-';
    roundBracketLevel = Math.max(roundBracketLevel, 0);

    metadata = isBufferEmpty ?
      [position.line, position.column, position.source] :
      metadata;

    if (isEscaped) {
      // previous character was a backslash
      buffer.push(character);
      isBufferEmpty = false;
    } else if (characterWithNoSpecialMeaning) {
      // it's just an alphanumeric character or a hyphen (part of any rule or property name) so let's end it quickly
      buffer.push(character);
      isBufferEmpty = false;
    } else if ((isSpace || isNewLineNix && !isNewLineWin) && (isQuoted || level == Level.COMMENT)) {
      buffer.push(character);
      isBufferEmpty = false;
    } else if ((isSpace || isNewLineNix && !isNewLineWin) && isBufferEmpty) ; else if (!isCommentEnd && level == Level.COMMENT) {
      buffer.push(character);
      isBufferEmpty = false;
    } else if (!isCommentStart && !isCommentEnd && isRaw) {
      buffer.push(character);
      isBufferEmpty = false;
    } else if (isCommentStart && (level == Level.BLOCK || level == Level.RULE) && buffer.length > 1) {
      // comment start within block preceded by some content, e.g. div/*<--
      metadatas.push(metadata);
      buffer.push(character);
      buffers.push(buffer.slice(0, -2));
      isBufferEmpty = false;

      buffer = buffer.slice(-2);
      metadata = [position.line, position.column - 1, position.source];

      levels.push(level);
      level = Level.COMMENT;
    } else if (isCommentStart) {
      // comment start, e.g. /*<--
      levels.push(level);
      level = Level.COMMENT;
      buffer.push(character);
      isBufferEmpty = false;
    } else if (isCommentEnd && isIgnoreStartComment(buffer)) {
      // ignore:start comment end, e.g. /* clean-css ignore:start */<--
      serializedBuffer = buffer.join('').trim() + character;
      lastToken = [Token$1.COMMENT, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]];
      newTokens.push(lastToken);

      isRaw = true;
      metadata = metadatas.pop() || null;
      buffer = buffers.pop() || [];
      isBufferEmpty = buffer.length === 0;
    } else if (isCommentEnd && isIgnoreEndComment(buffer)) {
      // ignore:start comment end, e.g. /* clean-css ignore:end */<--
      serializedBuffer = buffer.join('') + character;
      lastCommentStartAt = serializedBuffer.lastIndexOf(Marker$1.FORWARD_SLASH + Marker$1.ASTERISK);

      serializedBufferPart = serializedBuffer.substring(0, lastCommentStartAt);
      lastToken = [Token$1.RAW, serializedBufferPart, [originalMetadata(metadata, serializedBufferPart, externalContext)]];
      newTokens.push(lastToken);

      serializedBufferPart = serializedBuffer.substring(lastCommentStartAt);
      metadata = [position.line, position.column - serializedBufferPart.length + 1, position.source];
      lastToken = [Token$1.COMMENT, serializedBufferPart, [originalMetadata(metadata, serializedBufferPart, externalContext)]];
      newTokens.push(lastToken);

      isRaw = false;
      level = levels.pop();
      metadata = metadatas.pop() || null;
      buffer = buffers.pop() || [];
      isBufferEmpty = buffer.length === 0;
    } else if (isCommentEnd) {
      // comment end, e.g. /* comment */<--
      serializedBuffer = buffer.join('').trim() + character;
      lastToken = [Token$1.COMMENT, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]];
      newTokens.push(lastToken);

      level = levels.pop();
      metadata = metadatas.pop() || null;
      buffer = buffers.pop() || [];
      isBufferEmpty = buffer.length === 0;
    } else if (isCommentEndMarker && source[position.index + 1] != Marker$1.ASTERISK) {
      externalContext.warnings.push('Unexpected \'*/\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SINGLE_QUOTE && !isQuoted) {
      // single quotation start, e.g. a[href^='https<--
      levels.push(level);
      level = Level.SINGLE_QUOTE;
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
      // single quotation end, e.g. a[href^='https'<--
      level = levels.pop();
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.DOUBLE_QUOTE && !isQuoted) {
      // double quotation start, e.g. a[href^="<--
      levels.push(level);
      level = Level.DOUBLE_QUOTE;
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
      // double quotation end, e.g. a[href^="https"<--
      level = levels.pop();
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character != Marker$1.CLOSE_ROUND_BRACKET && character != Marker$1.OPEN_ROUND_BRACKET && level != Level.COMMENT && !isQuoted && roundBracketLevel > 0) {
      // character inside any function, e.g. hsla(.<--
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.OPEN_ROUND_BRACKET && !isQuoted && level != Level.COMMENT && !seekingValue) {
      // round open bracket, e.g. @import url(<--
      buffer.push(character);
      isBufferEmpty = false;

      roundBracketLevel++;
    } else if (character == Marker$1.CLOSE_ROUND_BRACKET && !isQuoted && level != Level.COMMENT && !seekingValue) {
      // round open bracket, e.g. @import url(test.css)<--
      buffer.push(character);
      isBufferEmpty = false;

      roundBracketLevel--;
    } else if (character == Marker$1.SEMICOLON && level == Level.BLOCK && buffer[0] == Marker$1.AT) {
      // semicolon ending rule at block level, e.g. @import '...';<--
      serializedBuffer = buffer.join('').trim();
      allTokens.push([Token$1.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.COMMA && level == Level.BLOCK && ruleToken) {
      // comma separator at block level, e.g. a,div,<--
      serializedBuffer = buffer.join('').trim();
      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.COMMA && level == Level.BLOCK && tokenTypeFrom(buffer) == Token$1.AT_RULE) {
      // comma separator at block level, e.g. @import url(...) screen,<--
      // keep iterating as end semicolon will create the token
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.COMMA && level == Level.BLOCK) {
      // comma separator at block level, e.g. a,<--
      ruleToken = [tokenTypeFrom(buffer), [], []];
      serializedBuffer = buffer.join('').trim();
      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, 0)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.OPEN_CURLY_BRACKET && level == Level.BLOCK && ruleToken && ruleToken[0] == Token$1.NESTED_BLOCK) {
      // open brace opening at-rule at block level, e.g. @media{<--
      serializedBuffer = buffer.join('').trim();
      ruleToken[1].push([Token$1.NESTED_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      allTokens.push(ruleToken);

      levels.push(level);
      position.column++;
      position.index++;
      buffer = [];
      isBufferEmpty = true;

      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
      ruleToken = null;
    } else if (character == Marker$1.OPEN_CURLY_BRACKET && level == Level.BLOCK && tokenTypeFrom(buffer) == Token$1.NESTED_BLOCK) {
      // open brace opening at-rule at block level, e.g. @media{<--
      serializedBuffer = buffer.join('').trim();
      ruleToken = ruleToken || [Token$1.NESTED_BLOCK, [], []];
      ruleToken[1].push([Token$1.NESTED_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      allTokens.push(ruleToken);

      levels.push(level);
      position.column++;
      position.index++;
      buffer = [];
      isBufferEmpty = true;

      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
      ruleToken = null;
    } else if (character == Marker$1.OPEN_CURLY_BRACKET && level == Level.BLOCK) {
      // open brace opening rule at block level, e.g. div{<--
      serializedBuffer = buffer.join('').trim();
      ruleToken = ruleToken || [tokenTypeFrom(buffer), [], []];
      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]]);
      newTokens = ruleToken[2];
      allTokens.push(ruleToken);

      levels.push(level);
      level = Level.RULE;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.OPEN_CURLY_BRACKET && level == Level.RULE && seekingValue) {
      // open brace opening rule at rule level, e.g. div{--variable:{<--
      ruleTokens.push(ruleToken);
      ruleToken = [Token$1.PROPERTY_BLOCK, []];
      propertyToken.push(ruleToken);
      newTokens = ruleToken[1];

      levels.push(level);
      level = Level.RULE;
      seekingValue = false;
    } else if (character == Marker$1.OPEN_CURLY_BRACKET && level == Level.RULE && isPageMarginBox(buffer)) {
      // open brace opening page-margin box at rule level, e.g. @page{@top-center{<--
      serializedBuffer = buffer.join('').trim();
      ruleTokens.push(ruleToken);
      ruleToken = [Token$1.AT_RULE_BLOCK, [], []];
      ruleToken[1].push([Token$1.AT_RULE_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      newTokens.push(ruleToken);
      newTokens = ruleToken[2];

      levels.push(level);
      level = Level.RULE;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.COLON && level == Level.RULE && !seekingValue) {
      // colon at rule level, e.g. a{color:<--
      serializedBuffer = buffer.join('').trim();
      propertyToken = [Token$1.PROPERTY, [Token$1.PROPERTY_NAME, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]];
      newTokens.push(propertyToken);

      seekingValue = true;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && propertyToken && ruleTokens.length > 0 && !isBufferEmpty && buffer[0] == Marker$1.AT) {
      // semicolon at rule level for at-rule, e.g. a{--color:{@apply(--other-color);<--
      serializedBuffer = buffer.join('').trim();
      ruleToken[1].push([Token$1.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && propertyToken && !isBufferEmpty) {
      // semicolon at rule level, e.g. a{color:red;<--
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      propertyToken = null;
      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && propertyToken && isBufferEmpty && isVariable && !propertyToken[2]) {
      // semicolon after empty variable value at rule level, e.g. a{--color: ;<--
      propertyToken.push([Token$1.PROPERTY_VALUE, ' ', [originalMetadata(metadata, ' ', externalContext)]]);
      isVariable = false;
      propertyToken = null;
      seekingValue = false;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && propertyToken && isBufferEmpty) {
      // semicolon after bracketed value at rule level, e.g. a{color:rgb(...);<--
      propertyToken = null;
      seekingValue = false;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && !isBufferEmpty && buffer[0] == Marker$1.AT) {
      // semicolon for at-rule at rule level, e.g. a{@apply(--variable);<--
      serializedBuffer = buffer.join('');
      newTokens.push([Token$1.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && seekingPropertyBlockClosing) {
      // close brace after a property block at rule level, e.g. a{--custom:{color:red;};<--
      seekingPropertyBlockClosing = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.SEMICOLON && level == Level.RULE && isBufferEmpty) ; else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && seekingValue && !isBufferEmpty && ruleTokens.length > 0) {
      // close brace at rule level, e.g. a{--color:{color:red}<--
      serializedBuffer = buffer.join('');
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      propertyToken = null;
      ruleToken = ruleTokens.pop();
      newTokens = ruleToken[2];

      level = levels.pop();
      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && !isBufferEmpty && buffer[0] == Marker$1.AT && ruleTokens.length > 0) {
      // close brace at rule level for at-rule, e.g. a{--color:{@apply(--other-color)}<--
      serializedBuffer = buffer.join('');
      ruleToken[1].push([Token$1.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      propertyToken = null;
      ruleToken = ruleTokens.pop();
      newTokens = ruleToken[2];

      level = levels.pop();
      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && ruleTokens.length > 0) {
      // close brace at rule level after space, e.g. a{--color:{color:red }<--
      propertyToken = null;
      ruleToken = ruleTokens.pop();
      newTokens = ruleToken[2];

      level = levels.pop();
      seekingValue = false;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && !isBufferEmpty) {
      // close brace at rule level, e.g. a{color:red}<--
      serializedBuffer = buffer.join('');
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      propertyToken = null;
      ruleToken = ruleTokens.pop();
      newTokens = allTokens;

      level = levels.pop();
      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && !isBufferEmpty && buffer[0] == Marker$1.AT) {
      // close brace after at-rule at rule level, e.g. a{@apply(--variable)}<--
      propertyToken = null;
      ruleToken = null;
      serializedBuffer = buffer.join('').trim();
      newTokens.push([Token$1.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      newTokens = allTokens;

      level = levels.pop();
      seekingValue = false;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && levels[levels.length - 1] == Level.RULE) {
      // close brace after a property block at rule level, e.g. a{--custom:{color:red;}<--
      propertyToken = null;
      ruleToken = ruleTokens.pop();
      newTokens = ruleToken[2];

      level = levels.pop();
      seekingValue = false;
      seekingPropertyBlockClosing = true;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE && isVariable && propertyToken && !propertyToken[2]) {
      // close brace after an empty variable declaration inside a rule, e.g. a{--color: }<--
      propertyToken.push([Token$1.PROPERTY_VALUE, ' ', [originalMetadata(metadata, ' ', externalContext)]]);
      isVariable = false;
      propertyToken = null;
      ruleToken = null;
      newTokens = allTokens;

      level = levels.pop();
      seekingValue = false;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.RULE) {
      // close brace after a rule, e.g. a{color:red;}<--
      propertyToken = null;
      ruleToken = null;
      newTokens = allTokens;

      level = levels.pop();
      seekingValue = false;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.BLOCK && !isNested && position.index <= source.length - 1) {
      // stray close brace at block level, e.g. a{color:red}color:blue}<--
      externalContext.warnings.push('Unexpected \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
      buffer.push(character);
      isBufferEmpty = false;
    } else if (character == Marker$1.CLOSE_CURLY_BRACKET && level == Level.BLOCK) {
      // close brace at block level, e.g. @media screen {...}<--
      break;
    } else if (character == Marker$1.OPEN_ROUND_BRACKET && level == Level.RULE && seekingValue) {
      // round open bracket, e.g. a{color:hsla(<--
      buffer.push(character);
      isBufferEmpty = false;
      roundBracketLevel++;
    } else if (character == Marker$1.CLOSE_ROUND_BRACKET && level == Level.RULE && seekingValue && roundBracketLevel == 1) {
      // round close bracket, e.g. a{color:hsla(0,0%,0%)<--
      buffer.push(character);
      isBufferEmpty = false;
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      roundBracketLevel--;
      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_ROUND_BRACKET && level == Level.RULE && seekingValue) {
      // round close bracket within other brackets, e.g. a{width:calc((10rem / 2)<--
      buffer.push(character);
      isBufferEmpty = false;
      roundBracketLevel--;
    } else if (character == Marker$1.FORWARD_SLASH && source[position.index + 1] != Marker$1.ASTERISK && level == Level.RULE && seekingValue && !isBufferEmpty) {
      // forward slash within a property, e.g. a{background:url(image.png) 0 0/<--
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      propertyToken.push([Token$1.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.FORWARD_SLASH && source[position.index + 1] != Marker$1.ASTERISK && level == Level.RULE && seekingValue) {
      // forward slash within a property after space, e.g. a{background:url(image.png) 0 0 /<--
      propertyToken.push([Token$1.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.COMMA && level == Level.RULE && seekingValue && !isBufferEmpty) {
      // comma within a property, e.g. a{background:url(image.png),<--
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
      propertyToken.push([Token$1.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.COMMA && level == Level.RULE && seekingValue) {
      // comma within a property after space, e.g. a{background:url(image.png) ,<--
      propertyToken.push([Token$1.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (character == Marker$1.CLOSE_SQUARE_BRACKET && propertyToken && propertyToken.length > 1 && !isBufferEmpty && isRepeatToken(buffer)) {
      buffer.push(character);
      serializedBuffer = buffer.join('').trim();
      propertyToken[propertyToken.length - 1][1] += serializedBuffer;

      buffer = [];
      isBufferEmpty = true;
    } else if ((isSpace || (isNewLineNix && !isNewLineWin)) && level == Level.RULE && seekingValue && propertyToken && !isBufferEmpty) {
      // space or *nix newline within property, e.g. a{margin:0 <--
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (isNewLineWin && level == Level.RULE && seekingValue && propertyToken && buffer.length > 1) {
      // win newline within property, e.g. a{margin:0\r\n<--
      serializedBuffer = buffer.join('').trim();
      propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

      buffer = [];
      isBufferEmpty = true;
    } else if (isNewLineWin && level == Level.RULE && seekingValue) {
      // win newline
      buffer = [];
      isBufferEmpty = true;
    } else if (isNewLineWin && buffer.length == 1) {
      // ignore windows newline which is composed of two characters
      buffer.pop();
      isBufferEmpty = buffer.length === 0;
    } else if (!isBufferEmpty || !isSpace && !isNewLineNix && !isNewLineWin && !isCarriageReturn) {
      // any character
      buffer.push(character);
      isBufferEmpty = false;
    }

    wasEscaped = isEscaped;
    isEscaped = !wasEscaped && character == Marker$1.BACK_SLASH;
    wasCommentStart = isCommentStart;
    wasCommentEnd = isCommentEnd;

    position.line = (isNewLineWin || isNewLineNix || isCarriageReturn) ? position.line + 1 : position.line;
    position.column = (isNewLineWin || isNewLineNix || isCarriageReturn) ? 0 : position.column + 1;
  }

  if (seekingValue) {
    externalContext.warnings.push('Missing \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
  }

  if (seekingValue && buffer.length > 0) {
    serializedBuffer = buffer.join('').replace(TAIL_BROKEN_VALUE_PATTERN, '');
    propertyToken.push([Token$1.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);

    buffer = [];
  }

  if (buffer.length > 0) {
    externalContext.warnings.push('Invalid character(s) \'' + buffer.join('') + '\' at ' + formatPosition(metadata) + '. Ignoring.');
  }

  return allTokens;
}

function isIgnoreStartComment(buffer) {
  return IGNORE_START_COMMENT_PATTERN.test(buffer.join('') + Marker$1.FORWARD_SLASH);
}

function isIgnoreEndComment(buffer) {
  return IGNORE_END_COMMENT_PATTERN.test(buffer.join('') + Marker$1.FORWARD_SLASH);
}

function originalMetadata(metadata, value, externalContext, selectorFallbacks) {
  var source = metadata[2];

  return externalContext.inputSourceMapTracker.isTracking(source) ?
    externalContext.inputSourceMapTracker.originalPositionFor(metadata, value.length, selectorFallbacks) :
    metadata;
}

function tokenTypeFrom(buffer) {
  var isAtRule = buffer[0] == Marker$1.AT || buffer[0] == Marker$1.UNDERSCORE;
  var ruleWord = buffer.join('').split(RULE_WORD_SEPARATOR_PATTERN)[0];

  if (isAtRule && BLOCK_RULES.indexOf(ruleWord) > -1) {
    return Token$1.NESTED_BLOCK;
  } else if (isAtRule && AT_RULES.indexOf(ruleWord) > -1) {
    return Token$1.AT_RULE;
  } else if (isAtRule) {
    return Token$1.AT_RULE_BLOCK;
  } else {
    return Token$1.RULE;
  }
}

function tokenScopeFrom(tokenType) {
  if (tokenType == Token$1.RULE) {
    return Token$1.RULE_SCOPE;
  } else if (tokenType == Token$1.NESTED_BLOCK) {
    return Token$1.NESTED_BLOCK_SCOPE;
  } else if (tokenType == Token$1.AT_RULE_BLOCK) {
    return Token$1.AT_RULE_BLOCK_SCOPE;
  }
}

function isPageMarginBox(buffer) {
  var serializedBuffer = buffer.join('').trim();

  return PAGE_MARGIN_BOXES.indexOf(serializedBuffer) > -1 || EXTRA_PAGE_BOXES.indexOf(serializedBuffer) > -1;
}

function isRepeatToken(buffer) {
  return REPEAT_PATTERN.test(buffer.join('') + Marker$1.CLOSE_SQUARE_BRACKET);
}

var tokenize_1 = tokenize$1;

var fs = require$$0;
var path$2 = require$$1;

var applySourceMaps = applySourceMaps_1;
var extractImportUrlAndMedia = extractImportUrlAndMedia_1;
var isAllowedResource = isAllowedResource_1;
var loadOriginalSources = loadOriginalSources_1;
var normalizePath$1 = normalizePath_1;
var rebase = rebase_1;
var rebaseLocalMap = rebaseLocalMap_1;
var rebaseRemoteMap = rebaseRemoteMap_1;
var restoreImport = restoreImport_1;

var tokenize = tokenize_1;
var Token = token;
var Marker = marker;
var hasProtocol = hasProtocol_1;
var isImport = isImport_1;
var isRemoteResource$1 = isRemoteResource_1;

var UNKNOWN_URI = 'uri:unknown';

function readSources$1(input, context, callback) {
  return doReadSources(input, context, function (tokens) {
    return applySourceMaps(tokens, context, function () {
      return loadOriginalSources(context, function () { return callback(tokens); });
    });
  });
}

function doReadSources(input, context, callback) {
  if (typeof input == 'string') {
    return fromString(input, context, callback);
  } else if (Buffer$1.isBuffer(input)) {
    return fromString(input.toString(), context, callback);
  } else if (Array.isArray(input)) {
    return fromArray(input, context, callback);
  } else if (typeof input == 'object') {
    return fromHash(input, context, callback);
  }
}

function fromString(input, context, callback) {
  context.source = undefined;
  context.sourcesContent[undefined] = input;
  context.stats.originalSize += input.length;

  return fromStyles(input, context, { inline: context.options.inline }, callback);
}

function fromArray(input, context, callback) {
  var inputAsImports = input.reduce(function (accumulator, uriOrHash) {
    if (typeof uriOrHash === 'string') {
      return addStringSource(uriOrHash, accumulator);
    } else {
      return addHashSource(uriOrHash, context, accumulator);
    }

  }, []);

  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
}

function fromHash(input, context, callback) {
  var inputAsImports = addHashSource(input, context, []);
  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
}

function addStringSource(input, imports) {
  imports.push(restoreAsImport(normalizeUri(input)));
  return imports;
}

function addHashSource(input, context, imports) {
  var uri;
  var normalizedUri;
  var source;

  for (uri in input) {
    source = input[uri];
    normalizedUri = normalizeUri(uri);

    imports.push(restoreAsImport(normalizedUri));

    context.sourcesContent[normalizedUri] = source.styles;

    if (source.sourceMap) {
      trackSourceMap(source.sourceMap, normalizedUri, context);
    }
  }

  return imports;
}

function normalizeUri(uri) {
  var currentPath = path$2.resolve('');
  var absoluteUri;
  var relativeToCurrentPath;
  var normalizedUri;

  if (isRemoteResource$1(uri)) {
    return uri;
  }

  absoluteUri = path$2.isAbsolute(uri) ?
    uri :
    path$2.resolve(uri);
  relativeToCurrentPath = path$2.relative(currentPath, absoluteUri);
  normalizedUri = normalizePath$1(relativeToCurrentPath);

  return normalizedUri;
}

function trackSourceMap(sourceMap, uri, context) {
  var parsedMap = typeof sourceMap == 'string' ?
      JSON.parse(sourceMap) :
      sourceMap;
  var rebasedMap = isRemoteResource$1(uri) ?
    rebaseRemoteMap(parsedMap, uri) :
    rebaseLocalMap(parsedMap, uri || UNKNOWN_URI, context.options.rebaseTo);

  context.inputSourceMapTracker.track(uri, rebasedMap);
}

function restoreAsImport(uri) {
  return restoreImport('url(' + uri + ')', '') + Marker.SEMICOLON;
}

function fromStyles(styles, context, parentInlinerContext, callback) {
  var tokens;
  var rebaseConfig = {};

  if (!context.source) {
    rebaseConfig.fromBase = path$2.resolve('');
    rebaseConfig.toBase = context.options.rebaseTo;
  } else if (isRemoteResource$1(context.source)) {
    rebaseConfig.fromBase = context.source;
    rebaseConfig.toBase = context.source;
  } else if (path$2.isAbsolute(context.source)) {
    rebaseConfig.fromBase = path$2.dirname(context.source);
    rebaseConfig.toBase = context.options.rebaseTo;
  } else {
    rebaseConfig.fromBase = path$2.dirname(path$2.resolve(context.source));
    rebaseConfig.toBase = context.options.rebaseTo;
  }

  tokens = tokenize(styles, context);
  tokens = rebase(tokens, context.options.rebase, context.validator, rebaseConfig);

  return allowsAnyImports(parentInlinerContext.inline) ?
    inline$1(tokens, context, parentInlinerContext, callback) :
    callback(tokens);
}

function allowsAnyImports(inline) {
  return !(inline.length == 1 && inline[0] == 'none');
}

function inline$1(tokens, externalContext, parentInlinerContext, callback) {
  var inlinerContext = {
    afterContent: false,
    callback: callback,
    errors: externalContext.errors,
    externalContext: externalContext,
    fetch: externalContext.options.fetch,
    inlinedStylesheets: parentInlinerContext.inlinedStylesheets || externalContext.inlinedStylesheets,
    inline: parentInlinerContext.inline,
    inlineRequest: externalContext.options.inlineRequest,
    inlineTimeout: externalContext.options.inlineTimeout,
    isRemote: parentInlinerContext.isRemote || false,
    localOnly: externalContext.localOnly,
    outputTokens: [],
    rebaseTo: externalContext.options.rebaseTo,
    sourceTokens: tokens,
    warnings: externalContext.warnings
  };

  return doInlineImports(inlinerContext);
}

function doInlineImports(inlinerContext) {
  var token;
  var i, l;

  for (i = 0, l = inlinerContext.sourceTokens.length; i < l; i++) {
    token = inlinerContext.sourceTokens[i];

    if (token[0] == Token.AT_RULE && isImport(token[1])) {
      inlinerContext.sourceTokens.splice(0, i);
      return inlineStylesheet(token, inlinerContext);
    } else if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) {
      inlinerContext.outputTokens.push(token);
    } else {
      inlinerContext.outputTokens.push(token);
      inlinerContext.afterContent = true;
    }
  }

  inlinerContext.sourceTokens = [];
  return inlinerContext.callback(inlinerContext.outputTokens);
}

function inlineStylesheet(token, inlinerContext) {
  var uriAndMediaQuery = extractImportUrlAndMedia(token[1]);
  var uri = uriAndMediaQuery[0];
  var mediaQuery = uriAndMediaQuery[1];
  var metadata = token[2];

  return isRemoteResource$1(uri) ?
    inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext) :
    inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext);
}

function inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext) {
  var isAllowed = isAllowedResource(uri, true, inlinerContext.inline);
  var originalUri = uri;
  var isLoaded = uri in inlinerContext.externalContext.sourcesContent;
  var isRuntimeResource = !hasProtocol(uri);

  if (inlinerContext.inlinedStylesheets.indexOf(uri) > -1) {
    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as it has already been imported.');
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  } else if (inlinerContext.localOnly && inlinerContext.afterContent) {
    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as no callback given and after other content.');
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  } else if (isRuntimeResource) {
    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no protocol given.');
    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  } else if (inlinerContext.localOnly && !isLoaded) {
    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no callback given.');
    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  } else if (!isAllowed && inlinerContext.afterContent) {
    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as resource is not allowed and after other content.');
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  } else if (!isAllowed) {
    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as resource is not allowed.');
    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
    return doInlineImports(inlinerContext);
  }

  inlinerContext.inlinedStylesheets.push(uri);

  function whenLoaded(error, importedStyles) {
    if (error) {
      inlinerContext.errors.push('Broken @import declaration of "' + uri + '" - ' + error);

      return browser$1.nextTick(function () {
        inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
        inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
        doInlineImports(inlinerContext);
      });
    }

    inlinerContext.inline = inlinerContext.externalContext.options.inline;
    inlinerContext.isRemote = true;

    inlinerContext.externalContext.source = originalUri;
    inlinerContext.externalContext.sourcesContent[uri] = importedStyles;
    inlinerContext.externalContext.stats.originalSize += importedStyles.length;

    return fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function (importedTokens) {
      importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);

      inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
      inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);

      return doInlineImports(inlinerContext);
    });
  }

  return isLoaded ?
    whenLoaded(null, inlinerContext.externalContext.sourcesContent[uri]) :
    inlinerContext.fetch(uri, inlinerContext.inlineRequest, inlinerContext.inlineTimeout, whenLoaded);
}

function inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext) {
  var currentPath = path$2.resolve('');
  var absoluteUri = path$2.isAbsolute(uri) ?
    path$2.resolve(currentPath, uri[0] == '/' ? uri.substring(1) : uri) :
    path$2.resolve(inlinerContext.rebaseTo, uri);
  var relativeToCurrentPath = path$2.relative(currentPath, absoluteUri);
  var importedStyles;
  var isAllowed = isAllowedResource(uri, false, inlinerContext.inline);
  var normalizedPath = normalizePath$1(relativeToCurrentPath);
  var isLoaded = normalizedPath in inlinerContext.externalContext.sourcesContent;

  if (inlinerContext.inlinedStylesheets.indexOf(absoluteUri) > -1) {
    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as it has already been imported.');
  } else if (isAllowed && !isLoaded && (!fs.existsSync(absoluteUri) || !fs.statSync(absoluteUri).isFile())) {
    inlinerContext.errors.push('Ignoring local @import of "' + uri + '" as resource is missing.');
  } else if (!isAllowed && inlinerContext.afterContent) {
    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as resource is not allowed and after other content.');
  } else if (inlinerContext.afterContent) {
    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as after other content.');
  } else if (!isAllowed) {
    inlinerContext.warnings.push('Skipping local @import of "' + uri + '" as resource is not allowed.');
    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
  } else {
    importedStyles = isLoaded ?
      inlinerContext.externalContext.sourcesContent[normalizedPath] :
      fs.readFileSync(absoluteUri, 'utf-8');

    inlinerContext.inlinedStylesheets.push(absoluteUri);
    inlinerContext.inline = inlinerContext.externalContext.options.inline;

    inlinerContext.externalContext.source = normalizedPath;
    inlinerContext.externalContext.sourcesContent[normalizedPath] = importedStyles;
    inlinerContext.externalContext.stats.originalSize += importedStyles.length;

    return fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function (importedTokens) {
      importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);

      inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
      inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);

      return doInlineImports(inlinerContext);
    });
  }

  inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);

  return doInlineImports(inlinerContext);
}

function wrapInMedia(tokens, mediaQuery, metadata) {
  if (mediaQuery) {
    return [[Token.NESTED_BLOCK, [[Token.NESTED_BLOCK_SCOPE, '@media ' + mediaQuery, metadata]], tokens]];
  } else {
    return tokens;
  }
}

var readSources_1 = readSources$1;

var all$1 = helpers$1.all;

function store$1(serializeContext, token) {
  var value = typeof token == 'string' ?
    token :
    token[1];
  var wrap = serializeContext.wrap;

  wrap(serializeContext, value);
  track$1(serializeContext, value);
  serializeContext.output.push(value);
}

function wrap$1(serializeContext, value) {
  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
    track$1(serializeContext, serializeContext.format.breakWith);
    serializeContext.output.push(serializeContext.format.breakWith);
  }
}

function track$1(serializeContext, value) {
  var parts = value.split('\n');

  serializeContext.line += parts.length - 1;
  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
}

function serializeStyles$1(tokens, context) {
  var serializeContext = {
    column: 0,
    format: context.options.format,
    indentBy: 0,
    indentWith: '',
    line: 1,
    output: [],
    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
    store: store$1,
    wrap: context.options.format.wrapAt ?
      wrap$1 :
      function () { /* noop */  }
  };

  all$1(serializeContext, tokens);

  return {
    styles: serializeContext.output.join('')
  };
}

var simple = serializeStyles$1;

var SourceMapGenerator$1 = sourceMap.SourceMapGenerator;
var all = helpers$1.all;

var isRemoteResource = isRemoteResource_1;

var isWindows = browser$1.platform == 'win32';

var NIX_SEPARATOR_PATTERN = /\//g;
var UNKNOWN_SOURCE = '$stdin';
var WINDOWS_SEPARATOR = '\\';

function store(serializeContext, element) {
  var fromString = typeof element == 'string';
  var value = fromString ? element : element[1];
  var mappings = fromString ? null : element[2];
  var wrap = serializeContext.wrap;

  wrap(serializeContext, value);
  track(serializeContext, value, mappings);
  serializeContext.output.push(value);
}

function wrap(serializeContext, value) {
  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
    track(serializeContext, serializeContext.format.breakWith, false);
    serializeContext.output.push(serializeContext.format.breakWith);
  }
}

function track(serializeContext, value, mappings) {
  var parts = value.split('\n');

  if (mappings) {
    trackAllMappings(serializeContext, mappings);
  }

  serializeContext.line += parts.length - 1;
  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
}

function trackAllMappings(serializeContext, mappings) {
  for (var i = 0, l = mappings.length; i < l; i++) {
    trackMapping(serializeContext, mappings[i]);
  }
}

function trackMapping(serializeContext, mapping) {
  var line = mapping[0];
  var column = mapping[1];
  var originalSource = mapping[2];
  var source = originalSource;
  var storedSource = source || UNKNOWN_SOURCE;

  if (isWindows && source && !isRemoteResource(source)) {
    storedSource = source.replace(NIX_SEPARATOR_PATTERN, WINDOWS_SEPARATOR);
  }

  serializeContext.outputMap.addMapping({
    generated: {
      line: serializeContext.line,
      column: serializeContext.column
    },
    source: storedSource,
    original: {
      line: line,
      column: column
    }
  });

  if (serializeContext.inlineSources && (originalSource in serializeContext.sourcesContent)) {
    serializeContext.outputMap.setSourceContent(storedSource, serializeContext.sourcesContent[originalSource]);
  }
}

function serializeStylesAndSourceMap$1(tokens, context) {
  var serializeContext = {
    column: 0,
    format: context.options.format,
    indentBy: 0,
    indentWith: '',
    inlineSources: context.options.sourceMapInlineSources,
    line: 1,
    output: [],
    outputMap: new SourceMapGenerator$1(),
    sourcesContent: context.sourcesContent,
    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
    store: store,
    wrap: context.options.format.wrapAt ?
      wrap :
      function () { /* noop */  }
  };

  all(serializeContext, tokens);

  return {
    sourceMap: serializeContext.outputMap,
    styles: serializeContext.output.join('')
  };
}

var sourceMaps = serializeStylesAndSourceMap$1;

var level0Optimize = optimize$4;
var level1Optimize = optimize$3;
var level2Optimize = optimize$1;
var validator = validator_1;

var compatibilityFrom = compatibility;
var fetchFrom = fetch;
var formatFrom = format$3.formatFrom;
var inlineFrom = inline$2;
var inlineRequestFrom = inlineRequest;
var inlineTimeoutFrom = inlineTimeout;
var OptimizationLevel = optimizationLevel.OptimizationLevel;
var optimizationLevelFrom = optimizationLevel.optimizationLevelFrom;
var pluginsFrom = plugins;
var rebaseFrom = rebase$3;
var rebaseToFrom = rebaseTo;

var inputSourceMapTracker = inputSourceMapTracker_1;
var readSources = readSources_1;

var serializeStyles = simple;
var serializeStylesAndSourceMap = sourceMaps;

var CleanCSS$1 = clean$1.exports = function CleanCSS(options) {
  options = options || {};

  this.options = {
    batch: !!options.batch,
    compatibility: compatibilityFrom(options.compatibility),
    explicitRebaseTo: 'rebaseTo' in options,
    fetch: fetchFrom(options.fetch),
    format: formatFrom(options.format),
    inline: inlineFrom(options.inline),
    inlineRequest: inlineRequestFrom(options.inlineRequest),
    inlineTimeout: inlineTimeoutFrom(options.inlineTimeout),
    level: optimizationLevelFrom(options.level),
    plugins: pluginsFrom(options.plugins),
    rebase: rebaseFrom(options.rebase, options.rebaseTo),
    rebaseTo: rebaseToFrom(options.rebaseTo),
    returnPromise: !!options.returnPromise,
    sourceMap: !!options.sourceMap,
    sourceMapInlineSources: !!options.sourceMapInlineSources
  };
};


// for compatibility with optimize-css-assets-webpack-plugin
CleanCSS$1.process = function (input, opts) {
  var cleanCss;
  var optsTo = opts.to;

  delete opts.to;
  cleanCss = new CleanCSS$1(Object.assign({ returnPromise: true, rebaseTo: optsTo }, opts));

  return cleanCss.minify(input)
    .then(function(output) {
      return { css: output.styles };
    });
};


CleanCSS$1.prototype.minify = function (input, maybeSourceMap, maybeCallback) {
  var options = this.options;

  if (options.returnPromise) {
    return new Promise(function (resolve, reject) {
      minifyAll(input, options, maybeSourceMap, function (errors, output) {
        return errors ?
          reject(errors) :
          resolve(output);
      });
    });
  } else {
    return minifyAll(input, options, maybeSourceMap, maybeCallback);
  }
};

function minifyAll(input, options, maybeSourceMap, maybeCallback) {
  if (options.batch && Array.isArray(input)) {
    return minifyInBatchesFromArray(input, options, maybeSourceMap, maybeCallback);
  } else if (options.batch && (typeof input == 'object')) {
    return minifyInBatchesFromHash(input, options, maybeSourceMap, maybeCallback);
  } else {
    return minify$2(input, options, maybeSourceMap, maybeCallback);
  }
}

function minifyInBatchesFromArray(input, options, maybeSourceMap, maybeCallback) {
  var callback = typeof maybeCallback == 'function' ?
    maybeCallback :
    (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
  var errors = [];
  var outputAsHash = {};
  var inputValue;
  var i, l;

  function whenHashBatchDone(innerErrors, output) {
    outputAsHash = Object.assign(outputAsHash, output);
    errors = errors.concat(innerErrors);
  }

  for (i = 0, l = input.length; i < l; i++) {
    if (typeof input[i] == 'object') {
      minifyInBatchesFromHash(input[i], options, whenHashBatchDone);
    } else {
      inputValue = input[i];

      outputAsHash[inputValue] = minify$2([inputValue], options);
      errors = errors.concat(outputAsHash[inputValue].errors);
    }
  }

  return callback ?
    callback(errors.length > 0 ? errors : null, outputAsHash) :
    outputAsHash;
}

function minifyInBatchesFromHash(input, options, maybeSourceMap, maybeCallback) {
  var callback = typeof maybeCallback == 'function' ?
    maybeCallback :
    (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
  var errors = [];
  var outputAsHash = {};
  var inputKey;
  var inputValue;

  for (inputKey in input) {
    inputValue = input[inputKey];

    outputAsHash[inputKey] = minify$2(inputValue.styles, options, inputValue.sourceMap);
    errors = errors.concat(outputAsHash[inputKey].errors);
  }

  return callback ?
    callback(errors.length > 0 ? errors : null, outputAsHash) :
    outputAsHash;
}

function minify$2(input, options, maybeSourceMap, maybeCallback) {
  var sourceMap = typeof maybeSourceMap != 'function' ?
    maybeSourceMap :
    null;
  var callback = typeof maybeCallback == 'function' ?
    maybeCallback :
    (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
  var context = {
    stats: {
      efficiency: 0,
      minifiedSize: 0,
      originalSize: 0,
      startedAt: Date.now(),
      timeSpent: 0
    },
    cache: {
      specificity: {}
    },
    errors: [],
    inlinedStylesheets: [],
    inputSourceMapTracker: inputSourceMapTracker(),
    localOnly: !callback,
    options: options,
    source: null,
    sourcesContent: {},
    validator: validator(options.compatibility),
    warnings: []
  };
  var implicitRebaseToWarning;

  if (sourceMap) {
    context.inputSourceMapTracker.track(undefined, sourceMap);
  }

  if (options.rebase && !options.explicitRebaseTo) {
    implicitRebaseToWarning =
      'You have set `rebase: true` without giving `rebaseTo` option, which, in this case, defaults to the current working directory. ' +
      'You are then warned this can lead to unexpected URL rebasing (aka here be dragons)! ' +
      'If you are OK with the clean-css output, then you can get rid of this warning by giving clean-css a `rebaseTo: process.cwd()` option.';
    context.warnings.push(implicitRebaseToWarning);
  }

  return runner(context.localOnly)(function () {
    return readSources(input, context, function (tokens) {
      var serialize = context.options.sourceMap ?
        serializeStylesAndSourceMap :
        serializeStyles;

      var optimizedTokens = optimize(tokens, context);
      var optimizedStyles = serialize(optimizedTokens, context);
      var output = withMetadata(optimizedStyles, context);

      return callback ?
        callback(context.errors.length > 0 ? context.errors : null, output) :
        output;
    });
  });
}

function runner(localOnly) {
  // to always execute code asynchronously when a callback is given
  // more at blog.izs.me/post/59142742143/designing-apis-for-asynchrony
  return localOnly ?
    function (callback) { return callback(); } :
    browser$1.nextTick;
}

function optimize(tokens, context) {
  var optimized = level0Optimize(tokens);

  optimized = OptimizationLevel.One in context.options.level ?
    level1Optimize(tokens, context) :
    tokens;
  optimized = OptimizationLevel.Two in context.options.level ?
    level2Optimize(tokens, context, true) :
    optimized;

  return optimized;
}

function withMetadata(output, context) {
  output.stats = calculateStatsFrom(output.styles, context);
  output.errors = context.errors;
  output.inlinedStylesheets = context.inlinedStylesheets;
  output.warnings = context.warnings;

  return output;
}

function calculateStatsFrom(styles, context) {
  var finishedAt = Date.now();
  var timeSpent = finishedAt - context.stats.startedAt;

  delete context.stats.startedAt;
  context.stats.timeSpent = timeSpent;
  context.stats.efficiency = 1 - styles.length / context.stats.originalSize;
  context.stats.minifiedSize = styles.length;

  return context.stats;
}

(function (module) {
	module.exports = clean$1.exports;
} (cleanCss));

var CleanCSS = /*@__PURE__*/getDefaultExportFromCjs(cleanCss.exports);

// Generated using scripts/write-decode-map.ts
var htmlDecodeTree = new Uint16Array(
// prettier-ignore
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    .split("")
    .map((c) => c.charCodeAt(0)));

// Generated using scripts/write-decode-map.ts
new Uint16Array(
// prettier-ignore
"\u0200aglq\t\x15\x18\x1b\u026d\x0f\0\0\x12p;\u4026os;\u4027t;\u403et;\u403cuot;\u4022"
    .split("")
    .map((c) => c.charCodeAt(0)));

// Adapted from https://github.com/mathiasbynens/he/blob/36afe179392226cf1b6ccdb16ebbb7a5a844d93a/src/he.js#L106-L134
var _a;
const decodeMap = new Map([
    [0, 65533],
    [128, 8364],
    [130, 8218],
    [131, 402],
    [132, 8222],
    [133, 8230],
    [134, 8224],
    [135, 8225],
    [136, 710],
    [137, 8240],
    [138, 352],
    [139, 8249],
    [140, 338],
    [142, 381],
    [145, 8216],
    [146, 8217],
    [147, 8220],
    [148, 8221],
    [149, 8226],
    [150, 8211],
    [151, 8212],
    [152, 732],
    [153, 8482],
    [154, 353],
    [155, 8250],
    [156, 339],
    [158, 382],
    [159, 376],
]);
const fromCodePoint = 
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition, node/no-unsupported-features/es-builtins
(_a = String.fromCodePoint) !== null && _a !== void 0 ? _a : function (codePoint) {
    let output = "";
    if (codePoint > 0xffff) {
        codePoint -= 0x10000;
        output += String.fromCharCode(((codePoint >>> 10) & 0x3ff) | 0xd800);
        codePoint = 0xdc00 | (codePoint & 0x3ff);
    }
    output += String.fromCharCode(codePoint);
    return output;
};
function replaceCodePoint(codePoint) {
    var _a;
    if ((codePoint >= 0xd800 && codePoint <= 0xdfff) || codePoint > 0x10ffff) {
        return 0xfffd;
    }
    return (_a = decodeMap.get(codePoint)) !== null && _a !== void 0 ? _a : codePoint;
}
function decodeCodePoint(codePoint) {
    return fromCodePoint(replaceCodePoint(codePoint));
}

var CharCodes;
(function (CharCodes) {
    CharCodes[CharCodes["NUM"] = 35] = "NUM";
    CharCodes[CharCodes["SEMI"] = 59] = "SEMI";
    CharCodes[CharCodes["ZERO"] = 48] = "ZERO";
    CharCodes[CharCodes["NINE"] = 57] = "NINE";
    CharCodes[CharCodes["LOWER_A"] = 97] = "LOWER_A";
    CharCodes[CharCodes["LOWER_F"] = 102] = "LOWER_F";
    CharCodes[CharCodes["LOWER_X"] = 120] = "LOWER_X";
    /** Bit that needs to be set to convert an upper case ASCII character to lower case */
    CharCodes[CharCodes["To_LOWER_BIT"] = 32] = "To_LOWER_BIT";
})(CharCodes || (CharCodes = {}));
var BinTrieFlags;
(function (BinTrieFlags) {
    BinTrieFlags[BinTrieFlags["VALUE_LENGTH"] = 49152] = "VALUE_LENGTH";
    BinTrieFlags[BinTrieFlags["BRANCH_LENGTH"] = 16256] = "BRANCH_LENGTH";
    BinTrieFlags[BinTrieFlags["JUMP_TABLE"] = 127] = "JUMP_TABLE";
})(BinTrieFlags || (BinTrieFlags = {}));
function getDecoder(decodeTree) {
    return function decodeHTMLBinary(str, strict) {
        let ret = "";
        let lastIdx = 0;
        let strIdx = 0;
        while ((strIdx = str.indexOf("&", strIdx)) >= 0) {
            ret += str.slice(lastIdx, strIdx);
            lastIdx = strIdx;
            // Skip the "&"
            strIdx += 1;
            // If we have a numeric entity, handle this separately.
            if (str.charCodeAt(strIdx) === CharCodes.NUM) {
                // Skip the leading "&#". For hex entities, also skip the leading "x".
                let start = strIdx + 1;
                let base = 10;
                let cp = str.charCodeAt(start);
                if ((cp | CharCodes.To_LOWER_BIT) === CharCodes.LOWER_X) {
                    base = 16;
                    strIdx += 1;
                    start += 1;
                }
                do
                    cp = str.charCodeAt(++strIdx);
                while ((cp >= CharCodes.ZERO && cp <= CharCodes.NINE) ||
                    (base === 16 &&
                        (cp | CharCodes.To_LOWER_BIT) >= CharCodes.LOWER_A &&
                        (cp | CharCodes.To_LOWER_BIT) <= CharCodes.LOWER_F));
                if (start !== strIdx) {
                    const entity = str.substring(start, strIdx);
                    const parsed = parseInt(entity, base);
                    if (str.charCodeAt(strIdx) === CharCodes.SEMI) {
                        strIdx += 1;
                    }
                    else if (strict) {
                        continue;
                    }
                    ret += decodeCodePoint(parsed);
                    lastIdx = strIdx;
                }
                continue;
            }
            let resultIdx = 0;
            let excess = 1;
            let treeIdx = 0;
            let current = decodeTree[treeIdx];
            for (; strIdx < str.length; strIdx++, excess++) {
                treeIdx = determineBranch(decodeTree, current, treeIdx + 1, str.charCodeAt(strIdx));
                if (treeIdx < 0)
                    break;
                current = decodeTree[treeIdx];
                const masked = current & BinTrieFlags.VALUE_LENGTH;
                // If the branch is a value, store it and continue
                if (masked) {
                    // If we have a legacy entity while parsing strictly, just skip the number of bytes
                    if (!strict || str.charCodeAt(strIdx) === CharCodes.SEMI) {
                        resultIdx = treeIdx;
                        excess = 0;
                    }
                    // The mask is the number of bytes of the value, including the current byte.
                    const valueLength = (masked >> 14) - 1;
                    if (valueLength === 0)
                        break;
                    treeIdx += valueLength;
                }
            }
            if (resultIdx !== 0) {
                const valueLength = (decodeTree[resultIdx] & BinTrieFlags.VALUE_LENGTH) >> 14;
                ret +=
                    valueLength === 1
                        ? String.fromCharCode(decodeTree[resultIdx] & ~BinTrieFlags.VALUE_LENGTH)
                        : valueLength === 2
                            ? String.fromCharCode(decodeTree[resultIdx + 1])
                            : String.fromCharCode(decodeTree[resultIdx + 1], decodeTree[resultIdx + 2]);
                lastIdx = strIdx - excess + 1;
            }
        }
        return ret + str.slice(lastIdx);
    };
}
function determineBranch(decodeTree, current, nodeIdx, char) {
    const branchCount = (current & BinTrieFlags.BRANCH_LENGTH) >> 7;
    const jumpOffset = current & BinTrieFlags.JUMP_TABLE;
    // Case 1: Single branch encoded in jump offset
    if (branchCount === 0) {
        return jumpOffset !== 0 && char === jumpOffset ? nodeIdx : -1;
    }
    // Case 2: Multiple branches encoded in jump table
    if (jumpOffset) {
        const value = char - jumpOffset;
        return value < 0 || value >= branchCount
            ? -1
            : decodeTree[nodeIdx + value] - 1;
    }
    // Case 3: Multiple branches encoded in dictionary
    // Binary search for the character.
    let lo = nodeIdx;
    let hi = lo + branchCount - 1;
    while (lo <= hi) {
        const mid = (lo + hi) >>> 1;
        const midVal = decodeTree[mid];
        if (midVal < char) {
            lo = mid + 1;
        }
        else if (midVal > char) {
            hi = mid - 1;
        }
        else {
            return decodeTree[mid + branchCount];
        }
    }
    return -1;
}
const htmlDecoder = getDecoder(htmlDecodeTree);
/**
 * Decodes an HTML string, allowing for entities not terminated by a semi-colon.
 *
 * @param str The string to decode.
 * @returns The decoded string.
 */
function decodeHTML(str) {
    return htmlDecoder(str, false);
}
/**
 * Decodes an HTML string, requiring all entities to be terminated by a semi-colon.
 *
 * @param str The string to decode.
 * @returns The decoded string.
 */
function decodeHTMLStrict(str) {
    return htmlDecoder(str, true);
}

var constants$2 =
{
	// Output
	ABSOLUTE:      "absolute",
	PATH_RELATIVE: "pathRelative",
	ROOT_RELATIVE: "rootRelative",
	SHORTEST:      "shortest"
};

var constants$1 = constants$2;



function formatAuth(urlObj, options)
{
	if (urlObj.auth && !options.removeAuth && (urlObj.extra.relation.maximumHost || options.output===constants$1.ABSOLUTE))
	{
		return urlObj.auth + "@";
	}
	
	return "";
}



function formatHash(urlObj, options)
{
	return urlObj.hash ? urlObj.hash : "";
}



function formatHost(urlObj, options)
{
	if (urlObj.host.full && (urlObj.extra.relation.maximumAuth || options.output===constants$1.ABSOLUTE))
	{
		return urlObj.host.full;
	}
	
	return "";
}



function formatPath(urlObj, options)
{
	var str = "";
	
	var absolutePath = urlObj.path.absolute.string;
	var relativePath = urlObj.path.relative.string;
	var resource = showResource(urlObj, options);
	
	if (urlObj.extra.relation.maximumHost || options.output===constants$1.ABSOLUTE || options.output===constants$1.ROOT_RELATIVE)
	{
		str = absolutePath;
	}
	else if (relativePath.length<=absolutePath.length && options.output===constants$1.SHORTEST || options.output===constants$1.PATH_RELATIVE)
	{
		str = relativePath;
		
		if (str === "")
		{
			var query = showQuery(urlObj,options) && !!getQuery(urlObj,options);
			
			if (urlObj.extra.relation.maximumPath && !resource)
			{
				str = "./";
			}
			else if (urlObj.extra.relation.overridesQuery && !resource && !query)
			{
				str = "./";
			}
		}
	}
	else
	{
		str = absolutePath;
	}
	
	if ( str==="/" && !resource && options.removeRootTrailingSlash && (!urlObj.extra.relation.minimumPort || options.output===constants$1.ABSOLUTE) )
	{
		str = "";
	}
	
	return str;
}



function formatPort(urlObj, options)
{
	if (urlObj.port && !urlObj.extra.portIsDefault && urlObj.extra.relation.maximumHost)
	{
		return ":" + urlObj.port;
	}
	
	return "";
}



function formatQuery(urlObj, options)
{
	return showQuery(urlObj,options) ? getQuery(urlObj, options) : "";
}



function formatResource(urlObj, options)
{
	return showResource(urlObj,options) ? urlObj.resource : "";
}



function formatScheme(urlObj, options)
{
	var str = "";
	
	if (urlObj.extra.relation.maximumHost || options.output===constants$1.ABSOLUTE)
	{
		if (!urlObj.extra.relation.minimumScheme || !options.schemeRelative || options.output===constants$1.ABSOLUTE)
		{
			str += urlObj.scheme + "://";
		}
		else
		{
			str += "//";
		}
	}
	
	return str;
}



function formatUrl$1(urlObj, options)
{
	var url = "";
	
	url += formatScheme(urlObj, options);
	url += formatAuth(urlObj, options);
	url += formatHost(urlObj, options);
	url += formatPort(urlObj);
	url += formatPath(urlObj, options);
	url += formatResource(urlObj, options);
	url += formatQuery(urlObj, options);
	url += formatHash(urlObj);
	
	return url;
}



function getQuery(urlObj, options)
{
	var stripQuery = options.removeEmptyQueries && urlObj.extra.relation.minimumPort;
	
	return urlObj.query.string[ stripQuery ? "stripped" : "full" ];
}



function showQuery(urlObj, options)
{
	return !urlObj.extra.relation.minimumQuery || options.output===constants$1.ABSOLUTE || options.output===constants$1.ROOT_RELATIVE;
}



function showResource(urlObj, options)
{
	var removeIndex = options.removeDirectoryIndexes && urlObj.extra.resourceIsIndex;
	var removeMatchingResource = urlObj.extra.relation.minimumResource && options.output!==constants$1.ABSOLUTE && options.output!==constants$1.ROOT_RELATIVE;
	
	return !!urlObj.resource && !removeMatchingResource && !removeIndex;
}



var format = formatUrl$1;

/*
	Deep-clone an object.
*/
function clone(obj)
{
	if (obj instanceof Object)
	{
		var clonedObj = (obj instanceof Array) ? [] : {};
		
		for (var i in obj)
		{
			if ( obj.hasOwnProperty(i) )
			{
				clonedObj[i] = clone( obj[i] );
			}
		}
		
		return clonedObj;
	}
	
	return obj;
}



/*
	https://github.com/jonschlinkert/is-plain-object
*/
function isPlainObject(obj)
{
	return !!obj && typeof obj==="object" && obj.constructor===Object;
}



/*
	Shallow-merge two objects.
*/
function shallowMerge(target, source)
{
	if (target instanceof Object && source instanceof Object)
	{
		for (var i in source)
		{
			if ( source.hasOwnProperty(i) )
			{
				target[i] = source[i];
			}
		}
	}
	
	return target;
}



var object =
{
	clone: clone,
	isPlainObject: isPlainObject,
	shallowMerge: shallowMerge
};

var objUtils$2 = object;



function getOptions$1(options, defaults)
{
	if ( objUtils$2.isPlainObject(options) )
	{
		var newOptions = {};
		
		for (var i in defaults)
		{
			if ( defaults.hasOwnProperty(i) )
			{
				if (options[i] !== undefined)
				{
					newOptions[i] = mergeOption(options[i], defaults[i]);
				}
				else
				{
					newOptions[i] = defaults[i];
				}
			}
		}
		
		return newOptions;
	}
	else
	{
		return defaults;
	}
}



function mergeOption(newValues, defaultValues)
{
	if (defaultValues instanceof Object && newValues instanceof Object)
	{
		if (defaultValues instanceof Array && newValues instanceof Array)
		{
			return defaultValues.concat(newValues);
		}
		else
		{
			return objUtils$2.shallowMerge(newValues, defaultValues);
		}
	}
	
	return newValues;
}



var options = getOptions$1;

function hrefInfo$1(urlObj)
{
	var minimumPathOnly     = (!urlObj.scheme && !urlObj.auth && !urlObj.host.full && !urlObj.port);
	var minimumResourceOnly = (minimumPathOnly && !urlObj.path.absolute.string);
	var minimumQueryOnly    = (minimumResourceOnly && !urlObj.resource);
	var minimumHashOnly     = (minimumQueryOnly && !urlObj.query.string.full.length);
	var empty               = (minimumHashOnly && !urlObj.hash);
	
	urlObj.extra.hrefInfo.minimumPathOnly     = minimumPathOnly;
	urlObj.extra.hrefInfo.minimumResourceOnly = minimumResourceOnly;
	urlObj.extra.hrefInfo.minimumQueryOnly    = minimumQueryOnly;
	urlObj.extra.hrefInfo.minimumHashOnly     = minimumHashOnly;
	urlObj.extra.hrefInfo.empty = empty;
}



var hrefInfo_1 = hrefInfo$1;

function parseHost$1(urlObj, options)
{
	// TWEAK :: condition only for speed optimization
	if (options.ignore_www)
	{
		var host = urlObj.host.full;
		
		if (host)
		{
			var stripped = host;
			
			if (host.indexOf("www.") === 0)
			{
				stripped = host.substr(4);
			}
			
			urlObj.host.stripped = stripped;
		}
	}
}



var host = parseHost$1;

function isDirectoryIndex(resource, options)
{
	var verdict = false;
	
	options.directoryIndexes.every( function(index)
	{
		if (index === resource)
		{
			verdict = true;
			return false;
		}
		
		return true;
	});
	
	return verdict;
}



function parsePath$1(urlObj, options)
{
	var path = urlObj.path.absolute.string;
	
	if (path)
	{
		var lastSlash = path.lastIndexOf("/");
		
		if (lastSlash > -1)
		{
			if (++lastSlash < path.length)
			{
				var resource = path.substr(lastSlash);
				
				if (resource!=="." && resource!=="..")
				{
					urlObj.resource = resource;
					path = path.substr(0, lastSlash);
				}
				else
				{
					path += "/";
				}
			}
			
			urlObj.path.absolute.string = path;
			urlObj.path.absolute.array = splitPath(path);
		}
		else if (path==="." || path==="..")
		{
			// "..?var", "..#anchor", etc ... not "..index.html"
			path += "/";
			
			urlObj.path.absolute.string = path;
			urlObj.path.absolute.array = splitPath(path);
		}
		else
		{
			// Resource-only
			urlObj.resource = path;
			urlObj.path.absolute.string = null;
		}
		
		urlObj.extra.resourceIsIndex = isDirectoryIndex(urlObj.resource, options);
	}
	// Else: query/hash-only or empty
}



function splitPath(path)
{
	// TWEAK :: condition only for speed optimization
	if (path !== "/")
	{
		var cleaned = [];
		
		path.split("/").forEach( function(dir)
		{
			// Cleanup -- splitting "/dir/" becomes ["","dir",""]
			if (dir !== "")
			{
				cleaned.push(dir);
			}
		});
		
		return cleaned;
	}
	else
	{
		// Faster to skip the above block and just create an array
		return [];
	}
}



var path$1 = parsePath$1;

function parsePort$1(urlObj, options)
{
	var defaultPort = -1;
	
	for (var i in options.defaultPorts)
	{
		if ( i===urlObj.scheme && options.defaultPorts.hasOwnProperty(i) )
		{
			defaultPort = options.defaultPorts[i];
			break;
		}
	}
	
	if (defaultPort > -1)
	{
		// Force same type as urlObj.port
		defaultPort = defaultPort.toString();
		
		if (urlObj.port === null)
		{
			urlObj.port = defaultPort;
		}
		
		urlObj.extra.portIsDefault = (urlObj.port === defaultPort);
	}
}



var port = parsePort$1;

var hasOwnProperty = Object.prototype.hasOwnProperty;



function parseQuery$1(urlObj, options)
{
	urlObj.query.string.full = stringify(urlObj.query.object, false);
	
	// TWEAK :: condition only for speed optimization
	if (options.removeEmptyQueries)
	{
		urlObj.query.string.stripped = stringify(urlObj.query.object, true);
	}
}



function stringify(queryObj, removeEmptyQueries)
{
	var count = 0;
	var str = "";
	
	for (var i in queryObj)
	{
		if ( i!=="" && hasOwnProperty.call(queryObj, i)===true )
		{
			var value = queryObj[i];
			
			if (value !== "" || !removeEmptyQueries)
			{
				str += (++count===1) ? "?" : "&";
				
				i = encodeURIComponent(i);
				
				if (value !== "")
				{
					str += i +"="+ encodeURIComponent(value).replace(/%20/g,"+");
				}
				else
				{
					str += i;
				}
			}
		}
	}
	
	return str;
}



var query = parseQuery$1;

var _parseUrl = require$$0$1.parse;



/*
	Customize the URL object that Node generates
	because:
	
	* necessary data for later
	* urlObj.host is useless
	* urlObj.hostname is too long
	* urlObj.path is useless
	* urlObj.pathname is too long
	* urlObj.protocol is inaccurate; should be called "scheme"
	* urlObj.search is mostly useless
*/
function clean(urlObj)
{
	var scheme = urlObj.protocol;
	
	if (scheme)
	{
		// Remove ":" suffix
		if (scheme.indexOf(":") === scheme.length-1)
		{
			scheme = scheme.substr(0, scheme.length-1);
		}
	}
	
	urlObj.host =
	{
		// TODO :: unescape(encodeURIComponent(s)) ? ... http://ecmanaut.blogspot.ca/2006/07/encoding-decoding-utf8-in-javascript.html
		full: urlObj.hostname,
		stripped: null
	};
	
	urlObj.path =
	{
		absolute:
		{
			array: null,
			string: urlObj.pathname
		},
		relative:
		{
			array: null,
			string: null
		}
	};
	
	urlObj.query =
	{
		object: urlObj.query,
		string:
		{
			full: null,
			stripped: null
		}
	};
	
	urlObj.extra =
	{
		hrefInfo:
		{
			minimumPathOnly: null,
			minimumResourceOnly: null,
			minimumQueryOnly: null,
			minimumHashOnly: null,
			empty: null,
			
			separatorOnlyQuery: urlObj.search==="?"
		},
		portIsDefault: null,
		relation:
		{
			maximumScheme: null,
			maximumAuth: null,
			maximumHost: null,
			maximumPort: null,
			maximumPath: null,
			maximumResource: null,
			maximumQuery: null,
			maximumHash: null,
			
			minimumScheme: null,
			minimumAuth: null,
			minimumHost: null,
			minimumPort: null,
			minimumPath: null,
			minimumResource: null,
			minimumQuery: null,
			minimumHash: null,
			
			overridesQuery: null
		},
		resourceIsIndex: null,
		slashes: urlObj.slashes
	};
	
	urlObj.resource = null;
	urlObj.scheme = scheme;
	delete urlObj.hostname;
	delete urlObj.pathname;
	delete urlObj.protocol;
	delete urlObj.search;
	delete urlObj.slashes;
	
	return urlObj;
}



function validScheme(url, options)
{
	var valid = true;
	
	options.rejectedSchemes.every( function(rejectedScheme)
	{
		valid = !(url.indexOf(rejectedScheme+":") === 0);
		
		// Break loop
		return valid;
	});
	
	return valid;
}



function parseUrlString$1(url, options)
{
	if ( validScheme(url,options) )
	{
		return clean( _parseUrl(url, true, options.slashesDenoteHost) );
	}
	else
	{
		return {href:url, valid:false};
	}
}



var urlstring = parseUrlString$1;

function joinPath(pathArray)
{
	if (pathArray.length > 0)
	{
		return pathArray.join("/") + "/";
	}
	else
	{
		return "";
	}
}



function resolveDotSegments(pathArray)
{
	var pathAbsolute = [];
	
	pathArray.forEach( function(dir)
	{
		if (dir !== "..")
		{
			if (dir !== ".")
			{
				pathAbsolute.push(dir);
			}
		}
		else
		{
			// Remove parent
			if (pathAbsolute.length > 0)
			{
				pathAbsolute.splice(pathAbsolute.length-1, 1);
			}
		}
	});
	
	return pathAbsolute;
}



var path =
{
	join: joinPath,
	resolveDotSegments: resolveDotSegments
};

var hrefInfo   = hrefInfo_1;
var parseHost  = host;
var parsePath  = path$1;
var parsePort  = port;
var parseQuery = query;
var parseUrlString = urlstring;
var pathUtils$2      = path;



function parseFromUrl(url, options, fallback)
{
	if (url)
	{
		var urlObj = parseUrl$2(url, options);
		
		// Because the following occurs in the relate stage for "to" URLs,
		// such had to be mostly duplicated here
		
		var pathArray = pathUtils$2.resolveDotSegments(urlObj.path.absolute.array);
		
		urlObj.path.absolute.array  = pathArray;
		urlObj.path.absolute.string = "/" + pathUtils$2.join(pathArray);
		
		return urlObj;
	}
	else
	{
		return fallback;
	}
}



function parseUrl$2(url, options)
{
	var urlObj = parseUrlString(url, options);
	
	if (urlObj.valid===false) return urlObj;
	
	parseHost(urlObj, options);
	parsePort(urlObj, options);
	parsePath(urlObj, options);
	parseQuery(urlObj, options);
	hrefInfo(urlObj);
	
	return urlObj;
}



var parse$1 =
{
	from: parseFromUrl,
	to:   parseUrl$2
};

function findRelation_upToPath(urlObj, siteUrlObj, options)
{
	// Path- or root-relative URL
	var pathOnly = urlObj.extra.hrefInfo.minimumPathOnly;
	
	// Matching scheme, scheme-relative or path-only
	var minimumScheme = (urlObj.scheme===siteUrlObj.scheme || !urlObj.scheme);
	
	// Matching auth, ignoring auth or path-only
	var minimumAuth = minimumScheme && (urlObj.auth===siteUrlObj.auth || options.removeAuth || pathOnly);
	
	// Matching host or path-only
	var www = options.ignore_www ? "stripped" : "full";
	var minimumHost = minimumAuth && (urlObj.host[www]===siteUrlObj.host[www] || pathOnly);
	
	// Matching port or path-only
	var minimumPort = minimumHost && (urlObj.port===siteUrlObj.port || pathOnly);
	
	urlObj.extra.relation.minimumScheme = minimumScheme;
	urlObj.extra.relation.minimumAuth   = minimumAuth;
	urlObj.extra.relation.minimumHost   = minimumHost;
	urlObj.extra.relation.minimumPort   = minimumPort;
	
	urlObj.extra.relation.maximumScheme = !minimumScheme || minimumScheme && !minimumAuth;
	urlObj.extra.relation.maximumAuth   = !minimumScheme || minimumScheme && !minimumHost;
	urlObj.extra.relation.maximumHost   = !minimumScheme || minimumScheme && !minimumPort;
}



function findRelation_pathOn(urlObj, siteUrlObj, options)
{
	var queryOnly = urlObj.extra.hrefInfo.minimumQueryOnly;
	var hashOnly  = urlObj.extra.hrefInfo.minimumHashOnly;
	var empty     = urlObj.extra.hrefInfo.empty;	// not required, but self-documenting
	
	// From upToPath()
	var minimumPort   = urlObj.extra.relation.minimumPort;
	var minimumScheme = urlObj.extra.relation.minimumScheme;
	
	// Matching port and path
	var minimumPath = minimumPort && urlObj.path.absolute.string===siteUrlObj.path.absolute.string;
	
	// Matching resource or query/hash-only or empty
	var matchingResource = (urlObj.resource===siteUrlObj.resource || !urlObj.resource && siteUrlObj.extra.resourceIsIndex) || (options.removeDirectoryIndexes && urlObj.extra.resourceIsIndex && !siteUrlObj.resource);
	var minimumResource = minimumPath && (matchingResource || queryOnly || hashOnly || empty);
	
	// Matching query or hash-only/empty
	var query = options.removeEmptyQueries ? "stripped" : "full";
	var urlQuery = urlObj.query.string[query];
	var siteUrlQuery = siteUrlObj.query.string[query];
	var minimumQuery = (minimumResource && !!urlQuery && urlQuery===siteUrlQuery) || ((hashOnly || empty) && !urlObj.extra.hrefInfo.separatorOnlyQuery);
	
	var minimumHash = minimumQuery && urlObj.hash===siteUrlObj.hash;
	
	urlObj.extra.relation.minimumPath     = minimumPath;
	urlObj.extra.relation.minimumResource = minimumResource;
	urlObj.extra.relation.minimumQuery    = minimumQuery;
	urlObj.extra.relation.minimumHash     = minimumHash;
	
	urlObj.extra.relation.maximumPort     = !minimumScheme || minimumScheme && !minimumPath;
	urlObj.extra.relation.maximumPath     = !minimumScheme || minimumScheme && !minimumResource;
	urlObj.extra.relation.maximumResource = !minimumScheme || minimumScheme && !minimumQuery;
	urlObj.extra.relation.maximumQuery    = !minimumScheme || minimumScheme && !minimumHash;
	urlObj.extra.relation.maximumHash     = !minimumScheme || minimumScheme && !minimumHash;	// there's nothing after hash, so it's the same as maximumQuery
	
	// Matching path and/or resource with existing but non-matching site query
	urlObj.extra.relation.overridesQuery  = minimumPath && urlObj.extra.relation.maximumResource && !minimumQuery && !!siteUrlQuery;
}



var findRelation$1 =
{
	pathOn:   findRelation_pathOn,
	upToPath: findRelation_upToPath
};

var findRelation = findRelation$1;
var objUtils$1     = object;
var pathUtils$1    = path;



function absolutize$1(urlObj, siteUrlObj, options)
{
	findRelation.upToPath(urlObj, siteUrlObj, options);
	
	// Fill in relative URLs
	if (urlObj.extra.relation.minimumScheme) urlObj.scheme = siteUrlObj.scheme;
	if (urlObj.extra.relation.minimumAuth)   urlObj.auth   = siteUrlObj.auth;
	if (urlObj.extra.relation.minimumHost)   urlObj.host   = objUtils$1.clone(siteUrlObj.host);
	if (urlObj.extra.relation.minimumPort)   copyPort(urlObj, siteUrlObj);
	if (urlObj.extra.relation.minimumScheme) copyPath(urlObj, siteUrlObj);
	
	// Check remaining relativeness now that path has been copied and/or resolved
	findRelation.pathOn(urlObj, siteUrlObj, options);
	
	// Fill in relative URLs
	if (urlObj.extra.relation.minimumResource) copyResource(urlObj, siteUrlObj);
	if (urlObj.extra.relation.minimumQuery)    urlObj.query = objUtils$1.clone(siteUrlObj.query);
	if (urlObj.extra.relation.minimumHash)     urlObj.hash  = siteUrlObj.hash;
}



/*
	Get an absolute path that's relative to site url.
*/
function copyPath(urlObj, siteUrlObj)
{
	if (urlObj.extra.relation.maximumHost || !urlObj.extra.hrefInfo.minimumResourceOnly)
	{
		var pathArray = urlObj.path.absolute.array;
		var pathString = "/";
		
		// If not erroneous URL
		if (pathArray)
		{
			// If is relative path
			if (urlObj.extra.hrefInfo.minimumPathOnly && urlObj.path.absolute.string.indexOf("/")!==0)
			{
				// Append path to site path
				pathArray = siteUrlObj.path.absolute.array.concat(pathArray);
			}
			
			pathArray   = pathUtils$1.resolveDotSegments(pathArray);
			pathString += pathUtils$1.join(pathArray);
		}
		else
		{
			pathArray = [];
		}
		
		urlObj.path.absolute.array  = pathArray;
		urlObj.path.absolute.string = pathString;
	}
	else
	{
		// Resource-, query- or hash-only or empty
		urlObj.path = objUtils$1.clone(siteUrlObj.path);
	}
}



function copyPort(urlObj, siteUrlObj)
{
	urlObj.port = siteUrlObj.port;
	
	urlObj.extra.portIsDefault = siteUrlObj.extra.portIsDefault;
}



function copyResource(urlObj, siteUrlObj)
{
	urlObj.resource = siteUrlObj.resource;
	
	urlObj.extra.resourceIsIndex = siteUrlObj.extra.resourceIsIndex;
}



var absolutize_1 = absolutize$1;

var pathUtils = path;



/*
	Get a path relative to the site path.
*/
function relatePath(absolutePath, siteAbsolutePath)
{
	var relativePath = [];
	
	// At this point, it's related to the host/port
	var related = true;
	var parentIndex = -1;
	
	// Find parents
	siteAbsolutePath.forEach( function(siteAbsoluteDir, i)
	{
		if (related)
		{
			if (absolutePath[i] !== siteAbsoluteDir)
			{
				related = false;
			}
			else
			{
				parentIndex = i;
			}
		}
		
		if (!related)
		{
			// Up one level
			relativePath.push("..");
		}
	});
	
	// Form path
	absolutePath.forEach( function(dir, i)
	{
		if (i > parentIndex)
		{
			relativePath.push(dir);
		}
	});
	
	return relativePath;
}



function relativize$1(urlObj, siteUrlObj, options)
{
	if (urlObj.extra.relation.minimumScheme)
	{
		var pathArray = relatePath(urlObj.path.absolute.array, siteUrlObj.path.absolute.array);
		
		urlObj.path.relative.array  = pathArray;
		urlObj.path.relative.string = pathUtils.join(pathArray);
	}
}



var relativize_1 = relativize$1;

var absolutize = absolutize_1;
var relativize = relativize_1;



function relateUrl$1(siteUrlObj, urlObj, options)
{
	absolutize(urlObj, siteUrlObj, options);
	relativize(urlObj, siteUrlObj);
	
	return urlObj;
}



var relate = relateUrl$1;

var constants  = constants$2;
var formatUrl  = format;
var getOptions = options;
var objUtils   = object;
var parseUrl$1   = parse$1;
var relateUrl  = relate;



function RelateUrl(from, options)
{
	this.options = getOptions(options,
	{
		defaultPorts: {ftp:21, http:80, https:443},
		directoryIndexes: ["index.html"],
		ignore_www: false,
		output: RelateUrl.SHORTEST,
		rejectedSchemes: ["data","javascript","mailto"],
		removeAuth: false,
		removeDirectoryIndexes: true,
		removeEmptyQueries: false,
		removeRootTrailingSlash: true,
		schemeRelative: true,
		site: undefined,
		slashesDenoteHost: true
	});
	
	this.from = parseUrl$1.from(from, this.options, null);
}



/*
	Usage: instance=new RelateUrl(); instance.relate();
*/
RelateUrl.prototype.relate = function(from, to, options)
{
	// relate(to,options)
	if ( objUtils.isPlainObject(to) )
	{
		options = to;
		to = from;
		from = null;
	}
	// relate(to)
	else if (!to)
	{
		to = from;
		from = null;
	}
	
	options = getOptions(options, this.options);
	from = from || options.site;
	from = parseUrl$1.from(from, options, this.from);
	
	if (!from || !from.href)
	{
		throw new Error("from value not defined.");
	}
	else if (from.extra.hrefInfo.minimumPathOnly)
	{
		throw new Error("from value supplied is not absolute: "+from.href);
	}
	
	to = parseUrl$1.to(to, options);
	
	if (to.valid===false) return to.href;
	
	to = relateUrl(from, to, options);
	to = formatUrl(to, options);
	
	return to;
};



/*
	Usage: RelateUrl.relate();
*/
RelateUrl.relate = function(from, to, options)
{
	return new RelateUrl().relate(from, to, options);
};



// Make constants accessible from API
objUtils.shallowMerge(RelateUrl, constants);



var lib = RelateUrl;

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

function characters(str) {
    return str.split("");
}

function member(name, array) {
    return array.includes(name);
}

class DefaultsError extends Error {
    constructor(msg, defs) {
        super();

        this.name = "DefaultsError";
        this.message = msg;
        this.defs = defs;
    }
}

function defaults(args, defs, croak) {
    if (args === true) {
        args = {};
    } else if (args != null && typeof args === "object") {
        args = {...args};
    }

    const ret = args || {};

    if (croak) for (const i in ret) if (HOP(ret, i) && !HOP(defs, i)) {
        throw new DefaultsError("`" + i + "` is not a supported option", defs);
    }

    for (const i in defs) if (HOP(defs, i)) {
        if (!args || !HOP(args, i)) {
            ret[i] = defs[i];
        } else if (i === "ecma") {
            let ecma = args[i] | 0;
            if (ecma > 5 && ecma < 2015) ecma += 2009;
            ret[i] = ecma;
        } else {
            ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
        }
    }

    return ret;
}

function noop() {}
function return_false() { return false; }
function return_true() { return true; }
function return_this() { return this; }
function return_null() { return null; }

var MAP = (function() {
    function MAP(a, f, backwards) {
        var ret = [], top = [], i;
        function doit() {
            var val = f(a[i], i);
            var is_last = val instanceof Last;
            if (is_last) val = val.v;
            if (val instanceof AtTop) {
                val = val.v;
                if (val instanceof Splice) {
                    top.push.apply(top, backwards ? val.v.slice().reverse() : val.v);
                } else {
                    top.push(val);
                }
            } else if (val !== skip) {
                if (val instanceof Splice) {
                    ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
                } else {
                    ret.push(val);
                }
            }
            return is_last;
        }
        if (Array.isArray(a)) {
            if (backwards) {
                for (i = a.length; --i >= 0;) if (doit()) break;
                ret.reverse();
                top.reverse();
            } else {
                for (i = 0; i < a.length; ++i) if (doit()) break;
            }
        } else {
            for (i in a) if (HOP(a, i)) if (doit()) break;
        }
        return top.concat(ret);
    }
    MAP.at_top = function(val) { return new AtTop(val); };
    MAP.splice = function(val) { return new Splice(val); };
    MAP.last = function(val) { return new Last(val); };
    var skip = MAP.skip = {};
    function AtTop(val) { this.v = val; }
    function Splice(val) { this.v = val; }
    function Last(val) { this.v = val; }
    return MAP;
})();

function make_node(ctor, orig, props) {
    if (!props) props = {};
    if (orig) {
        if (!props.start) props.start = orig.start;
        if (!props.end) props.end = orig.end;
    }
    return new ctor(props);
}

function push_uniq(array, el) {
    if (!array.includes(el))
        array.push(el);
}

function string_template(text, props) {
    return text.replace(/{(.+?)}/g, function(str, p) {
        return props && props[p];
    });
}

function remove(array, el) {
    for (var i = array.length; --i >= 0;) {
        if (array[i] === el) array.splice(i, 1);
    }
}

function mergeSort(array, cmp) {
    if (array.length < 2) return array.slice();
    function merge(a, b) {
        var r = [], ai = 0, bi = 0, i = 0;
        while (ai < a.length && bi < b.length) {
            cmp(a[ai], b[bi]) <= 0
                ? r[i++] = a[ai++]
                : r[i++] = b[bi++];
        }
        if (ai < a.length) r.push.apply(r, a.slice(ai));
        if (bi < b.length) r.push.apply(r, b.slice(bi));
        return r;
    }
    function _ms(a) {
        if (a.length <= 1)
            return a;
        var m = Math.floor(a.length / 2), left = a.slice(0, m), right = a.slice(m);
        left = _ms(left);
        right = _ms(right);
        return merge(left, right);
    }
    return _ms(array);
}

function makePredicate(words) {
    if (!Array.isArray(words)) words = words.split(" ");

    return new Set(words.sort());
}

function map_add(map, key, value) {
    if (map.has(key)) {
        map.get(key).push(value);
    } else {
        map.set(key, [ value ]);
    }
}

function map_from_object(obj) {
    var map = new Map();
    for (var key in obj) {
        if (HOP(obj, key) && key.charAt(0) === "$") {
            map.set(key.substr(1), obj[key]);
        }
    }
    return map;
}

function map_to_object(map) {
    var obj = Object.create(null);
    map.forEach(function (value, key) {
        obj["$" + key] = value;
    });
    return obj;
}

function HOP(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
}

function keep_name(keep_setting, name) {
    return keep_setting === true
        || (keep_setting instanceof RegExp && keep_setting.test(name));
}

var lineTerminatorEscape = {
    "\0": "0",
    "\n": "n",
    "\r": "r",
    "\u2028": "u2028",
    "\u2029": "u2029",
};
function regexp_source_fix(source) {
    // V8 does not escape line terminators in regexp patterns in node 12
    // We'll also remove literal \0
    return source.replace(/[\0\n\r\u2028\u2029]/g, function (match, offset) {
        var escaped = source[offset - 1] == "\\"
            && (source[offset - 2] != "\\"
            || /(?:^|[^\\])(?:\\{2})*$/.test(source.slice(0, offset - 1)));
        return (escaped ? "" : "\\") + lineTerminatorEscape[match];
    });
}

// Subset of regexps that is not going to cause regexp based DDOS
// https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
const re_safe_regexp = /^[\\/|\0\s\w^$.[\]()]*$/;

/** Check if the regexp is safe for Terser to create without risking a RegExp DOS */
const regexp_is_safe = (source) => re_safe_regexp.test(source);

const all_flags = "dgimsuy";
function sort_regexp_flags(flags) {
    const existing_flags = new Set(flags.split(""));
    let out = "";
    for (const flag of all_flags) {
        if (existing_flags.has(flag)) {
            out += flag;
            existing_flags.delete(flag);
        }
    }
    if (existing_flags.size) {
        // Flags Terser doesn't know about
        existing_flags.forEach(flag => { out += flag; });
    }
    return out;
}

function has_annotation(node, annotation) {
    return node._annotations & annotation;
}

function set_annotation(node, annotation) {
    node._annotations |= annotation;
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
    Parser based on parse-js (http://marijn.haverbeke.nl/parse-js/).

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

var LATEST_RAW = "";  // Only used for numbers and template strings
var TEMPLATE_RAWS = new Map();  // Raw template strings

var KEYWORDS = "break case catch class const continue debugger default delete do else export extends finally for function if in instanceof let new return switch throw try typeof var void while with";
var KEYWORDS_ATOM = "false null true";
var RESERVED_WORDS = "enum import super this " + KEYWORDS_ATOM + " " + KEYWORDS;
var ALL_RESERVED_WORDS = "implements interface package private protected public static " + RESERVED_WORDS;
var KEYWORDS_BEFORE_EXPRESSION = "return new delete throw else case yield await";

KEYWORDS = makePredicate(KEYWORDS);
RESERVED_WORDS = makePredicate(RESERVED_WORDS);
KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION);
KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM);
ALL_RESERVED_WORDS = makePredicate(ALL_RESERVED_WORDS);

var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^"));

var RE_NUM_LITERAL = /[0-9a-f]/i;
var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;
var RE_OCT_NUMBER = /^0[0-7]+$/;
var RE_ES6_OCT_NUMBER = /^0o[0-7]+$/i;
var RE_BIN_NUMBER = /^0b[01]+$/i;
var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i;
var RE_BIG_INT = /^(0[xob])?[0-9a-f]+n$/i;

var OPERATORS = makePredicate([
    "in",
    "instanceof",
    "typeof",
    "new",
    "void",
    "delete",
    "++",
    "--",
    "+",
    "-",
    "!",
    "~",
    "&",
    "|",
    "^",
    "*",
    "**",
    "/",
    "%",
    ">>",
    "<<",
    ">>>",
    "<",
    ">",
    "<=",
    ">=",
    "==",
    "===",
    "!=",
    "!==",
    "?",
    "=",
    "+=",
    "-=",
    "||=",
    "&&=",
    "??=",
    "/=",
    "*=",
    "**=",
    "%=",
    ">>=",
    "<<=",
    ">>>=",
    "|=",
    "^=",
    "&=",
    "&&",
    "??",
    "||",
]);

var WHITESPACE_CHARS = makePredicate(characters(" \u00a0\n\r\t\f\u000b\u200b\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000\uFEFF"));

var NEWLINE_CHARS = makePredicate(characters("\n\r\u2028\u2029"));

var PUNC_AFTER_EXPRESSION = makePredicate(characters(";]),:"));

var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,;:"));

var PUNC_CHARS = makePredicate(characters("[]{}(),;:"));

/* -----[ Tokenizer ]----- */

// surrogate safe regexps adapted from https://github.com/mathiasbynens/unicode-8.0.0/tree/89b412d8a71ecca9ed593d9e9fa073ab64acfebe/Binary_Property
var UNICODE = {
    ID_Start: /[$A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0-\u08B4\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2118-\u211D\u2124\u2126\u2128\u212A-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309B-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FD5\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7AD\uA7B0-\uA7B7\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDE80-\uDE9C\uDEA0-\uDED0\uDF00-\uDF1F\uDF30-\uDF4A\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE4\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2]|\uD804[\uDC03-\uDC37\uDC83-\uDCAF\uDCD0-\uDCE8\uDD03-\uDD26\uDD50-\uDD7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    ID_Continue: 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};

function get_full_char(str, pos) {
    if (is_surrogate_pair_head(str.charCodeAt(pos))) {
        if (is_surrogate_pair_tail(str.charCodeAt(pos + 1))) {
            return str.charAt(pos) + str.charAt(pos + 1);
        }
    } else if (is_surrogate_pair_tail(str.charCodeAt(pos))) {
        if (is_surrogate_pair_head(str.charCodeAt(pos - 1))) {
            return str.charAt(pos - 1) + str.charAt(pos);
        }
    }
    return str.charAt(pos);
}

function get_full_char_code(str, pos) {
    // https://en.wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates
    if (is_surrogate_pair_head(str.charCodeAt(pos))) {
        return 0x10000 + (str.charCodeAt(pos) - 0xd800 << 10) + str.charCodeAt(pos + 1) - 0xdc00;
    }
    return str.charCodeAt(pos);
}

function get_full_char_length(str) {
    var surrogates = 0;

    for (var i = 0; i < str.length; i++) {
        if (is_surrogate_pair_head(str.charCodeAt(i)) && is_surrogate_pair_tail(str.charCodeAt(i + 1))) {
            surrogates++;
            i++;
        }
    }

    return str.length - surrogates;
}

function from_char_code(code) {
    // Based on https://github.com/mathiasbynens/String.fromCodePoint/blob/master/fromcodepoint.js
    if (code > 0xFFFF) {
        code -= 0x10000;
        return (String.fromCharCode((code >> 10) + 0xD800) +
            String.fromCharCode((code % 0x400) + 0xDC00));
    }
    return String.fromCharCode(code);
}

function is_surrogate_pair_head(code) {
    return code >= 0xd800 && code <= 0xdbff;
}

function is_surrogate_pair_tail(code) {
    return code >= 0xdc00 && code <= 0xdfff;
}

function is_digit(code) {
    return code >= 48 && code <= 57;
}

function is_identifier_start(ch) {
    return UNICODE.ID_Start.test(ch);
}

function is_identifier_char(ch) {
    return UNICODE.ID_Continue.test(ch);
}

const BASIC_IDENT = /^[a-z_$][a-z0-9_$]*$/i;

function is_basic_identifier_string(str) {
    return BASIC_IDENT.test(str);
}

function is_identifier_string(str, allow_surrogates) {
    if (BASIC_IDENT.test(str)) {
        return true;
    }
    if (!allow_surrogates && /[\ud800-\udfff]/.test(str)) {
        return false;
    }
    var match = UNICODE.ID_Start.exec(str);
    if (!match || match.index !== 0) {
        return false;
    }

    str = str.slice(match[0].length);
    if (!str) {
        return true;
    }

    match = UNICODE.ID_Continue.exec(str);
    return !!match && match[0].length === str.length;
}

function parse_js_number(num, allow_e = true) {
    if (!allow_e && num.includes("e")) {
        return NaN;
    }
    if (RE_HEX_NUMBER.test(num)) {
        return parseInt(num.substr(2), 16);
    } else if (RE_OCT_NUMBER.test(num)) {
        return parseInt(num.substr(1), 8);
    } else if (RE_ES6_OCT_NUMBER.test(num)) {
        return parseInt(num.substr(2), 8);
    } else if (RE_BIN_NUMBER.test(num)) {
        return parseInt(num.substr(2), 2);
    } else if (RE_DEC_NUMBER.test(num)) {
        return parseFloat(num);
    } else {
        var val = parseFloat(num);
        if (val == num) return val;
    }
}

class JS_Parse_Error extends Error {
    constructor(message, filename, line, col, pos) {
        super();

        this.name = "SyntaxError";
        this.message = message;
        this.filename = filename;
        this.line = line;
        this.col = col;
        this.pos = pos;
    }
}

function js_error(message, filename, line, col, pos) {
    throw new JS_Parse_Error(message, filename, line, col, pos);
}

function is_token(token, type, val) {
    return token.type == type && (val == null || token.value == val);
}

var EX_EOF = {};

function tokenizer($TEXT, filename, html5_comments, shebang) {
    var S = {
        text            : $TEXT,
        filename        : filename,
        pos             : 0,
        tokpos          : 0,
        line            : 1,
        tokline         : 0,
        col             : 0,
        tokcol          : 0,
        newline_before  : false,
        regex_allowed   : false,
        brace_counter   : 0,
        template_braces : [],
        comments_before : [],
        directives      : {},
        directive_stack : []
    };

    function peek() { return get_full_char(S.text, S.pos); }

    // Used because parsing ?. involves a lookahead for a digit
    function is_option_chain_op() {
        const must_be_dot = S.text.charCodeAt(S.pos + 1) === 46;
        if (!must_be_dot) return false;

        const cannot_be_digit = S.text.charCodeAt(S.pos + 2);
        return cannot_be_digit < 48 || cannot_be_digit > 57;
    }

    function next(signal_eof, in_string) {
        var ch = get_full_char(S.text, S.pos++);
        if (signal_eof && !ch)
            throw EX_EOF;
        if (NEWLINE_CHARS.has(ch)) {
            S.newline_before = S.newline_before || !in_string;
            ++S.line;
            S.col = 0;
            if (ch == "\r" && peek() == "\n") {
                // treat a \r\n sequence as a single \n
                ++S.pos;
                ch = "\n";
            }
        } else {
            if (ch.length > 1) {
                ++S.pos;
                ++S.col;
            }
            ++S.col;
        }
        return ch;
    }

    function forward(i) {
        while (i--) next();
    }

    function looking_at(str) {
        return S.text.substr(S.pos, str.length) == str;
    }

    function find_eol() {
        var text = S.text;
        for (var i = S.pos, n = S.text.length; i < n; ++i) {
            var ch = text[i];
            if (NEWLINE_CHARS.has(ch))
                return i;
        }
        return -1;
    }

    function find(what, signal_eof) {
        var pos = S.text.indexOf(what, S.pos);
        if (signal_eof && pos == -1) throw EX_EOF;
        return pos;
    }

    function start_token() {
        S.tokline = S.line;
        S.tokcol = S.col;
        S.tokpos = S.pos;
    }

    var prev_was_dot = false;
    var previous_token = null;
    function token(type, value, is_comment) {
        S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX.has(value)) ||
                           (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION.has(value)) ||
                           (type == "punc" && PUNC_BEFORE_EXPRESSION.has(value))) ||
                           (type == "arrow");
        if (type == "punc" && (value == "." || value == "?.")) {
            prev_was_dot = true;
        } else if (!is_comment) {
            prev_was_dot = false;
        }
        const line     = S.tokline;
        const col      = S.tokcol;
        const pos      = S.tokpos;
        const nlb      = S.newline_before;
        const file     = filename;
        let comments_before = [];
        let comments_after  = [];

        if (!is_comment) {
            comments_before = S.comments_before;
            comments_after = S.comments_before = [];
        }
        S.newline_before = false;
        const tok = new AST_Token(type, value, line, col, pos, nlb, comments_before, comments_after, file);

        if (!is_comment) previous_token = tok;
        return tok;
    }

    function skip_whitespace() {
        while (WHITESPACE_CHARS.has(peek()))
            next();
    }

    function read_while(pred) {
        var ret = "", ch, i = 0;
        while ((ch = peek()) && pred(ch, i++))
            ret += next();
        return ret;
    }

    function parse_error(err) {
        js_error(err, filename, S.tokline, S.tokcol, S.tokpos);
    }

    function read_num(prefix) {
        var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".", is_big_int = false, numeric_separator = false;
        var num = read_while(function(ch, i) {
            if (is_big_int) return false;

            var code = ch.charCodeAt(0);
            switch (code) {
              case 95: // _
                return (numeric_separator = true);
              case 98: case 66: // bB
                return (has_x = true); // Can occur in hex sequence, don't return false yet
              case 111: case 79: // oO
              case 120: case 88: // xX
                return has_x ? false : (has_x = true);
              case 101: case 69: // eE
                return has_x ? true : has_e ? false : (has_e = after_e = true);
              case 45: // -
                return after_e || (i == 0 && !prefix);
              case 43: // +
                return after_e;
              case (after_e = false, 46): // .
                return (!has_dot && !has_x && !has_e) ? (has_dot = true) : false;
            }

            if (ch === "n") {
                is_big_int = true;

                return true;
            }

            return RE_NUM_LITERAL.test(ch);
        });
        if (prefix) num = prefix + num;

        LATEST_RAW = num;

        if (RE_OCT_NUMBER.test(num) && next_token.has_directive("use strict")) {
            parse_error("Legacy octal literals are not allowed in strict mode");
        }
        if (numeric_separator) {
            if (num.endsWith("_")) {
                parse_error("Numeric separators are not allowed at the end of numeric literals");
            } else if (num.includes("__")) {
                parse_error("Only one underscore is allowed as numeric separator");
            }
            num = num.replace(/_/g, "");
        }
        if (num.endsWith("n")) {
            const without_n = num.slice(0, -1);
            const allow_e = RE_HEX_NUMBER.test(without_n);
            const valid = parse_js_number(without_n, allow_e);
            if (!has_dot && RE_BIG_INT.test(num) && !isNaN(valid))
                return token("big_int", without_n);
            parse_error("Invalid or unexpected token");
        }
        var valid = parse_js_number(num);
        if (!isNaN(valid)) {
            return token("num", valid);
        } else {
            parse_error("Invalid syntax: " + num);
        }
    }

    function is_octal(ch) {
        return ch >= "0" && ch <= "7";
    }

    function read_escaped_char(in_string, strict_hex, template_string) {
        var ch = next(true, in_string);
        switch (ch.charCodeAt(0)) {
          case 110 : return "\n";
          case 114 : return "\r";
          case 116 : return "\t";
          case 98  : return "\b";
          case 118 : return "\u000b"; // \v
          case 102 : return "\f";
          case 120 : return String.fromCharCode(hex_bytes(2, strict_hex)); // \x
          case 117 : // \u
            if (peek() == "{") {
                next(true);
                if (peek() === "}")
                    parse_error("Expecting hex-character between {}");
                while (peek() == "0") next(true); // No significance
                var result, length = find("}", true) - S.pos;
                // Avoid 32 bit integer overflow (1 << 32 === 1)
                // We know first character isn't 0 and thus out of range anyway
                if (length > 6 || (result = hex_bytes(length, strict_hex)) > 0x10FFFF) {
                    parse_error("Unicode reference out of bounds");
                }
                next(true);
                return from_char_code(result);
            }
            return String.fromCharCode(hex_bytes(4, strict_hex));
          case 10  : return ""; // newline
          case 13  :            // \r
            if (peek() == "\n") { // DOS newline
                next(true, in_string);
                return "";
            }
        }
        if (is_octal(ch)) {
            if (template_string && strict_hex) {
                const represents_null_character = ch === "0" && !is_octal(peek());
                if (!represents_null_character) {
                    parse_error("Octal escape sequences are not allowed in template strings");
                }
            }
            return read_octal_escape_sequence(ch, strict_hex);
        }
        return ch;
    }

    function read_octal_escape_sequence(ch, strict_octal) {
        // Read
        var p = peek();
        if (p >= "0" && p <= "7") {
            ch += next(true);
            if (ch[0] <= "3" && (p = peek()) >= "0" && p <= "7")
                ch += next(true);
        }

        // Parse
        if (ch === "0") return "\0";
        if (ch.length > 0 && next_token.has_directive("use strict") && strict_octal)
            parse_error("Legacy octal escape sequences are not allowed in strict mode");
        return String.fromCharCode(parseInt(ch, 8));
    }

    function hex_bytes(n, strict_hex) {
        var num = 0;
        for (; n > 0; --n) {
            if (!strict_hex && isNaN(parseInt(peek(), 16))) {
                return parseInt(num, 16) || "";
            }
            var digit = next(true);
            if (isNaN(parseInt(digit, 16)))
                parse_error("Invalid hex-character pattern in string");
            num += digit;
        }
        return parseInt(num, 16);
    }

    var read_string = with_eof_error("Unterminated string constant", function() {
        const start_pos = S.pos;
        var quote = next(), ret = [];
        for (;;) {
            var ch = next(true, true);
            if (ch == "\\") ch = read_escaped_char(true, true);
            else if (ch == "\r" || ch == "\n") parse_error("Unterminated string constant");
            else if (ch == quote) break;
            ret.push(ch);
        }
        var tok = token("string", ret.join(""));
        LATEST_RAW = S.text.slice(start_pos, S.pos);
        tok.quote = quote;
        return tok;
    });

    var read_template_characters = with_eof_error("Unterminated template", function(begin) {
        if (begin) {
            S.template_braces.push(S.brace_counter);
        }
        var content = "", raw = "", ch, tok;
        next(true, true);
        while ((ch = next(true, true)) != "`") {
            if (ch == "\r") {
                if (peek() == "\n") ++S.pos;
                ch = "\n";
            } else if (ch == "$" && peek() == "{") {
                next(true, true);
                S.brace_counter++;
                tok = token(begin ? "template_head" : "template_substitution", content);
                TEMPLATE_RAWS.set(tok, raw);
                tok.template_end = false;
                return tok;
            }

            raw += ch;
            if (ch == "\\") {
                var tmp = S.pos;
                var prev_is_tag = previous_token && (previous_token.type === "name" || previous_token.type === "punc" && (previous_token.value === ")" || previous_token.value === "]"));
                ch = read_escaped_char(true, !prev_is_tag, true);
                raw += S.text.substr(tmp, S.pos - tmp);
            }

            content += ch;
        }
        S.template_braces.pop();
        tok = token(begin ? "template_head" : "template_substitution", content);
        TEMPLATE_RAWS.set(tok, raw);
        tok.template_end = true;
        return tok;
    });

    function skip_line_comment(type) {
        var regex_allowed = S.regex_allowed;
        var i = find_eol(), ret;
        if (i == -1) {
            ret = S.text.substr(S.pos);
            S.pos = S.text.length;
        } else {
            ret = S.text.substring(S.pos, i);
            S.pos = i;
        }
        S.col = S.tokcol + (S.pos - S.tokpos);
        S.comments_before.push(token(type, ret, true));
        S.regex_allowed = regex_allowed;
        return next_token;
    }

    var skip_multiline_comment = with_eof_error("Unterminated multiline comment", function() {
        var regex_allowed = S.regex_allowed;
        var i = find("*/", true);
        var text = S.text.substring(S.pos, i).replace(/\r\n|\r|\u2028|\u2029/g, "\n");
        // update stream position
        forward(get_full_char_length(text) /* text length doesn't count \r\n as 2 char while S.pos - i does */ + 2);
        S.comments_before.push(token("comment2", text, true));
        S.newline_before = S.newline_before || text.includes("\n");
        S.regex_allowed = regex_allowed;
        return next_token;
    });

    var read_name = with_eof_error("Unterminated identifier name", function() {
        var name = [], ch, escaped = false;
        var read_escaped_identifier_char = function() {
            escaped = true;
            next();
            if (peek() !== "u") {
                parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}");
            }
            return read_escaped_char(false, true);
        };

        // Read first character (ID_Start)
        if ((ch = peek()) === "\\") {
            ch = read_escaped_identifier_char();
            if (!is_identifier_start(ch)) {
                parse_error("First identifier char is an invalid identifier char");
            }
        } else if (is_identifier_start(ch)) {
            next();
        } else {
            return "";
        }

        name.push(ch);

        // Read ID_Continue
        while ((ch = peek()) != null) {
            if ((ch = peek()) === "\\") {
                ch = read_escaped_identifier_char();
                if (!is_identifier_char(ch)) {
                    parse_error("Invalid escaped identifier char");
                }
            } else {
                if (!is_identifier_char(ch)) {
                    break;
                }
                next();
            }
            name.push(ch);
        }
        const name_str = name.join("");
        if (RESERVED_WORDS.has(name_str) && escaped) {
            parse_error("Escaped characters are not allowed in keywords");
        }
        return name_str;
    });

    var read_regexp = with_eof_error("Unterminated regular expression", function(source) {
        var prev_backslash = false, ch, in_class = false;
        while ((ch = next(true))) if (NEWLINE_CHARS.has(ch)) {
            parse_error("Unexpected line terminator");
        } else if (prev_backslash) {
            source += "\\" + ch;
            prev_backslash = false;
        } else if (ch == "[") {
            in_class = true;
            source += ch;
        } else if (ch == "]" && in_class) {
            in_class = false;
            source += ch;
        } else if (ch == "/" && !in_class) {
            break;
        } else if (ch == "\\") {
            prev_backslash = true;
        } else {
            source += ch;
        }
        const flags = read_name();
        return token("regexp", "/" + source + "/" + flags);
    });

    function read_operator(prefix) {
        function grow(op) {
            if (!peek()) return op;
            var bigger = op + peek();
            if (OPERATORS.has(bigger)) {
                next();
                return grow(bigger);
            } else {
                return op;
            }
        }
        return token("operator", grow(prefix || next()));
    }

    function handle_slash() {
        next();
        switch (peek()) {
          case "/":
            next();
            return skip_line_comment("comment1");
          case "*":
            next();
            return skip_multiline_comment();
        }
        return S.regex_allowed ? read_regexp("") : read_operator("/");
    }

    function handle_eq_sign() {
        next();
        if (peek() === ">") {
            next();
            return token("arrow", "=>");
        } else {
            return read_operator("=");
        }
    }

    function handle_dot() {
        next();
        if (is_digit(peek().charCodeAt(0))) {
            return read_num(".");
        }
        if (peek() === ".") {
            next();  // Consume second dot
            next();  // Consume third dot
            return token("expand", "...");
        }

        return token("punc", ".");
    }

    function read_word() {
        var word = read_name();
        if (prev_was_dot) return token("name", word);
        return KEYWORDS_ATOM.has(word) ? token("atom", word)
            : !KEYWORDS.has(word) ? token("name", word)
            : OPERATORS.has(word) ? token("operator", word)
            : token("keyword", word);
    }

    function read_private_word() {
        next();
        return token("privatename", read_name());
    }

    function with_eof_error(eof_error, cont) {
        return function(x) {
            try {
                return cont(x);
            } catch(ex) {
                if (ex === EX_EOF) parse_error(eof_error);
                else throw ex;
            }
        };
    }

    function next_token(force_regexp) {
        if (force_regexp != null)
            return read_regexp(force_regexp);
        if (shebang && S.pos == 0 && looking_at("#!")) {
            start_token();
            forward(2);
            skip_line_comment("comment5");
        }
        for (;;) {
            skip_whitespace();
            start_token();
            if (html5_comments) {
                if (looking_at("<!--")) {
                    forward(4);
                    skip_line_comment("comment3");
                    continue;
                }
                if (looking_at("-->") && S.newline_before) {
                    forward(3);
                    skip_line_comment("comment4");
                    continue;
                }
            }
            var ch = peek();
            if (!ch) return token("eof");
            var code = ch.charCodeAt(0);
            switch (code) {
              case 34: case 39: return read_string();
              case 46: return handle_dot();
              case 47: {
                  var tok = handle_slash();
                  if (tok === next_token) continue;
                  return tok;
              }
              case 61: return handle_eq_sign();
              case 63: {
                  if (!is_option_chain_op()) break;  // Handled below

                  next(); // ?
                  next(); // .

                  return token("punc", "?.");
              }
              case 96: return read_template_characters(true);
              case 123:
                S.brace_counter++;
                break;
              case 125:
                S.brace_counter--;
                if (S.template_braces.length > 0
                    && S.template_braces[S.template_braces.length - 1] === S.brace_counter)
                    return read_template_characters(false);
                break;
            }
            if (is_digit(code)) return read_num();
            if (PUNC_CHARS.has(ch)) return token("punc", next());
            if (OPERATOR_CHARS.has(ch)) return read_operator();
            if (code == 92 || is_identifier_start(ch)) return read_word();
            if (code == 35) return read_private_word();
            break;
        }
        parse_error("Unexpected character '" + ch + "'");
    }

    next_token.next = next;
    next_token.peek = peek;

    next_token.context = function(nc) {
        if (nc) S = nc;
        return S;
    };

    next_token.add_directive = function(directive) {
        S.directive_stack[S.directive_stack.length - 1].push(directive);

        if (S.directives[directive] === undefined) {
            S.directives[directive] = 1;
        } else {
            S.directives[directive]++;
        }
    };

    next_token.push_directives_stack = function() {
        S.directive_stack.push([]);
    };

    next_token.pop_directives_stack = function() {
        var directives = S.directive_stack[S.directive_stack.length - 1];

        for (var i = 0; i < directives.length; i++) {
            S.directives[directives[i]]--;
        }

        S.directive_stack.pop();
    };

    next_token.has_directive = function(directive) {
        return S.directives[directive] > 0;
    };

    return next_token;

}

/* -----[ Parser (constants) ]----- */

var UNARY_PREFIX = makePredicate([
    "typeof",
    "void",
    "delete",
    "--",
    "++",
    "!",
    "~",
    "-",
    "+"
]);

var UNARY_POSTFIX = makePredicate([ "--", "++" ]);

var ASSIGNMENT = makePredicate([ "=", "+=", "-=", "??=", "&&=", "||=", "/=", "*=", "**=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=" ]);

var LOGICAL_ASSIGNMENT = makePredicate([ "??=", "&&=", "||=" ]);

var PRECEDENCE = (function(a, ret) {
    for (var i = 0; i < a.length; ++i) {
        var b = a[i];
        for (var j = 0; j < b.length; ++j) {
            ret[b[j]] = i + 1;
        }
    }
    return ret;
})(
    [
        ["||"],
        ["??"],
        ["&&"],
        ["|"],
        ["^"],
        ["&"],
        ["==", "===", "!=", "!=="],
        ["<", ">", "<=", ">=", "in", "instanceof"],
        [">>", "<<", ">>>"],
        ["+", "-"],
        ["*", "/", "%"],
        ["**"]
    ],
    {}
);

var ATOMIC_START_TOKEN = makePredicate([ "atom", "num", "big_int", "string", "regexp", "name" ]);

/* -----[ Parser ]----- */

function parse($TEXT, options) {
    // maps start tokens to count of comments found outside of their parens
    // Example: /* I count */ ( /* I don't */ foo() )
    // Useful because comments_before property of call with parens outside
    // contains both comments inside and outside these parens. Used to find the
    
    const outer_comments_before_counts = new WeakMap();

    options = defaults(options, {
        bare_returns   : false,
        ecma           : null,  // Legacy
        expression     : false,
        filename       : null,
        html5_comments : true,
        module         : false,
        shebang        : true,
        strict         : false,
        toplevel       : null,
    }, true);

    var S = {
        input         : (typeof $TEXT == "string"
                         ? tokenizer($TEXT, options.filename,
                                     options.html5_comments, options.shebang)
                         : $TEXT),
        token         : null,
        prev          : null,
        peeked        : null,
        in_function   : 0,
        in_async      : -1,
        in_generator  : -1,
        in_directives : true,
        in_loop       : 0,
        labels        : []
    };

    S.token = next();

    function is(type, value) {
        return is_token(S.token, type, value);
    }

    function peek() { return S.peeked || (S.peeked = S.input()); }

    function next() {
        S.prev = S.token;

        if (!S.peeked) peek();
        S.token = S.peeked;
        S.peeked = null;
        S.in_directives = S.in_directives && (
            S.token.type == "string" || is("punc", ";")
        );
        return S.token;
    }

    function prev() {
        return S.prev;
    }

    function croak(msg, line, col, pos) {
        var ctx = S.input.context();
        js_error(msg,
                 ctx.filename,
                 line != null ? line : ctx.tokline,
                 col != null ? col : ctx.tokcol,
                 pos != null ? pos : ctx.tokpos);
    }

    function token_error(token, msg) {
        croak(msg, token.line, token.col);
    }

    function unexpected(token) {
        if (token == null)
            token = S.token;
        token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")");
    }

    function expect_token(type, val) {
        if (is(type, val)) {
            return next();
        }
        token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»");
    }

    function expect(punc) { return expect_token("punc", punc); }

    function has_newline_before(token) {
        return token.nlb || !token.comments_before.every((comment) => !comment.nlb);
    }

    function can_insert_semicolon() {
        return !options.strict
            && (is("eof") || is("punc", "}") || has_newline_before(S.token));
    }

    function is_in_generator() {
        return S.in_generator === S.in_function;
    }

    function is_in_async() {
        return S.in_async === S.in_function;
    }

    function can_await() {
        return (
            S.in_async === S.in_function
            || S.in_function === 0 && S.input.has_directive("use strict")
        );
    }

    function semicolon(optional) {
        if (is("punc", ";")) next();
        else if (!optional && !can_insert_semicolon()) unexpected();
    }

    function parenthesised() {
        expect("(");
        var exp = expression(true);
        expect(")");
        return exp;
    }

    function embed_tokens(parser) {
        return function _embed_tokens_wrapper(...args) {
            const start = S.token;
            const expr = parser(...args);
            expr.start = start;
            expr.end = prev();
            return expr;
        };
    }

    function handle_regexp() {
        if (is("operator", "/") || is("operator", "/=")) {
            S.peeked = null;
            S.token = S.input(S.token.value.substr(1)); // force regexp
        }
    }

    var statement = embed_tokens(function statement(is_export_default, is_for_body, is_if_body) {
        handle_regexp();
        switch (S.token.type) {
          case "string":
            if (S.in_directives) {
                var token = peek();
                if (!LATEST_RAW.includes("\\")
                    && (is_token(token, "punc", ";")
                        || is_token(token, "punc", "}")
                        || has_newline_before(token)
                        || is_token(token, "eof"))) {
                    S.input.add_directive(S.token.value);
                } else {
                    S.in_directives = false;
                }
            }
            var dir = S.in_directives, stat = simple_statement();
            return dir && stat.body instanceof AST_String ? new AST_Directive(stat.body) : stat;
          case "template_head":
          case "num":
          case "big_int":
          case "regexp":
          case "operator":
          case "atom":
            return simple_statement();

          case "name":
            if (S.token.value == "async" && is_token(peek(), "keyword", "function")) {
                next();
                next();
                if (is_for_body) {
                    croak("functions are not allowed as the body of a loop");
                }
                return function_(AST_Defun, false, true, is_export_default);
            }
            if (S.token.value == "import" && !is_token(peek(), "punc", "(") && !is_token(peek(), "punc", ".")) {
                next();
                var node = import_statement();
                semicolon();
                return node;
            }
            return is_token(peek(), "punc", ":")
                ? labeled_statement()
                : simple_statement();

          case "punc":
            switch (S.token.value) {
              case "{":
                return new AST_BlockStatement({
                    start : S.token,
                    body  : block_(),
                    end   : prev()
                });
              case "[":
              case "(":
                return simple_statement();
              case ";":
                S.in_directives = false;
                next();
                return new AST_EmptyStatement();
              default:
                unexpected();
            }

          case "keyword":
            switch (S.token.value) {
              case "break":
                next();
                return break_cont(AST_Break);

              case "continue":
                next();
                return break_cont(AST_Continue);

              case "debugger":
                next();
                semicolon();
                return new AST_Debugger();

              case "do":
                next();
                var body = in_loop(statement);
                expect_token("keyword", "while");
                var condition = parenthesised();
                semicolon(true);
                return new AST_Do({
                    body      : body,
                    condition : condition
                });

              case "while":
                next();
                return new AST_While({
                    condition : parenthesised(),
                    body      : in_loop(function() { return statement(false, true); })
                });

              case "for":
                next();
                return for_();

              case "class":
                next();
                if (is_for_body) {
                    croak("classes are not allowed as the body of a loop");
                }
                if (is_if_body) {
                    croak("classes are not allowed as the body of an if");
                }
                return class_(AST_DefClass, is_export_default);

              case "function":
                next();
                if (is_for_body) {
                    croak("functions are not allowed as the body of a loop");
                }
                return function_(AST_Defun, false, false, is_export_default);

              case "if":
                next();
                return if_();

              case "return":
                if (S.in_function == 0 && !options.bare_returns)
                    croak("'return' outside of function");
                next();
                var value = null;
                if (is("punc", ";")) {
                    next();
                } else if (!can_insert_semicolon()) {
                    value = expression(true);
                    semicolon();
                }
                return new AST_Return({
                    value: value
                });

              case "switch":
                next();
                return new AST_Switch({
                    expression : parenthesised(),
                    body       : in_loop(switch_body_)
                });

              case "throw":
                next();
                if (has_newline_before(S.token))
                    croak("Illegal newline after 'throw'");
                var value = expression(true);
                semicolon();
                return new AST_Throw({
                    value: value
                });

              case "try":
                next();
                return try_();

              case "var":
                next();
                var node = var_();
                semicolon();
                return node;

              case "let":
                next();
                var node = let_();
                semicolon();
                return node;

              case "const":
                next();
                var node = const_();
                semicolon();
                return node;

              case "with":
                if (S.input.has_directive("use strict")) {
                    croak("Strict mode may not include a with statement");
                }
                next();
                return new AST_With({
                    expression : parenthesised(),
                    body       : statement()
                });

              case "export":
                if (!is_token(peek(), "punc", "(")) {
                    next();
                    var node = export_statement();
                    if (is("punc", ";")) semicolon();
                    return node;
                }
            }
        }
        unexpected();
    });

    function labeled_statement() {
        var label = as_symbol(AST_Label);
        if (label.name === "await" && is_in_async()) {
            token_error(S.prev, "await cannot be used as label inside async function");
        }
        if (S.labels.some((l) => l.name === label.name)) {
            // ECMA-262, 12.12: An ECMAScript program is considered
            // syntactically incorrect if it contains a
            // LabelledStatement that is enclosed by a
            // LabelledStatement with the same Identifier as label.
            croak("Label " + label.name + " defined twice");
        }
        expect(":");
        S.labels.push(label);
        var stat = statement();
        S.labels.pop();
        if (!(stat instanceof AST_IterationStatement)) {
            // check for `continue` that refers to this label.
            // those should be reported as syntax errors.
            // https://github.com/mishoo/UglifyJS2/issues/287
            label.references.forEach(function(ref) {
                if (ref instanceof AST_Continue) {
                    ref = ref.label.start;
                    croak("Continue label `" + label.name + "` refers to non-IterationStatement.",
                          ref.line, ref.col, ref.pos);
                }
            });
        }
        return new AST_LabeledStatement({ body: stat, label: label });
    }

    function simple_statement(tmp) {
        return new AST_SimpleStatement({ body: (tmp = expression(true), semicolon(), tmp) });
    }

    function break_cont(type) {
        var label = null, ldef;
        if (!can_insert_semicolon()) {
            label = as_symbol(AST_LabelRef, true);
        }
        if (label != null) {
            ldef = S.labels.find((l) => l.name === label.name);
            if (!ldef)
                croak("Undefined label " + label.name);
            label.thedef = ldef;
        } else if (S.in_loop == 0)
            croak(type.TYPE + " not inside a loop or switch");
        semicolon();
        var stat = new type({ label: label });
        if (ldef) ldef.references.push(stat);
        return stat;
    }

    function for_() {
        var for_await_error = "`for await` invalid in this context";
        var await_tok = S.token;
        if (await_tok.type == "name" && await_tok.value == "await") {
            if (!can_await()) {
                token_error(await_tok, for_await_error);
            }
            next();
        } else {
            await_tok = false;
        }
        expect("(");
        var init = null;
        if (!is("punc", ";")) {
            init =
                is("keyword", "var") ? (next(), var_(true)) :
                is("keyword", "let") ? (next(), let_(true)) :
                is("keyword", "const") ? (next(), const_(true)) :
                                       expression(true, true);
            var is_in = is("operator", "in");
            var is_of = is("name", "of");
            if (await_tok && !is_of) {
                token_error(await_tok, for_await_error);
            }
            if (is_in || is_of) {
                if (init instanceof AST_Definitions) {
                    if (init.definitions.length > 1)
                        token_error(init.start, "Only one variable declaration allowed in for..in loop");
                } else if (!(is_assignable(init) || (init = to_destructuring(init)) instanceof AST_Destructuring)) {
                    token_error(init.start, "Invalid left-hand side in for..in loop");
                }
                next();
                if (is_in) {
                    return for_in(init);
                } else {
                    return for_of(init, !!await_tok);
                }
            }
        } else if (await_tok) {
            token_error(await_tok, for_await_error);
        }
        return regular_for(init);
    }

    function regular_for(init) {
        expect(";");
        var test = is("punc", ";") ? null : expression(true);
        expect(";");
        var step = is("punc", ")") ? null : expression(true);
        expect(")");
        return new AST_For({
            init      : init,
            condition : test,
            step      : step,
            body      : in_loop(function() { return statement(false, true); })
        });
    }

    function for_of(init, is_await) {
        var lhs = init instanceof AST_Definitions ? init.definitions[0].name : null;
        var obj = expression(true);
        expect(")");
        return new AST_ForOf({
            await  : is_await,
            init   : init,
            name   : lhs,
            object : obj,
            body   : in_loop(function() { return statement(false, true); })
        });
    }

    function for_in(init) {
        var obj = expression(true);
        expect(")");
        return new AST_ForIn({
            init   : init,
            object : obj,
            body   : in_loop(function() { return statement(false, true); })
        });
    }

    var arrow_function = function(start, argnames, is_async) {
        if (has_newline_before(S.token)) {
            croak("Unexpected newline before arrow (=>)");
        }

        expect_token("arrow", "=>");

        var body = _function_body(is("punc", "{"), false, is_async);

        var end =
            body instanceof Array && body.length ? body[body.length - 1].end :
            body instanceof Array ? start :
                body.end;

        return new AST_Arrow({
            start    : start,
            end      : end,
            async    : is_async,
            argnames : argnames,
            body     : body
        });
    };

    var function_ = function(ctor, is_generator_property, is_async, is_export_default) {
        var in_statement = ctor === AST_Defun;
        var is_generator = is("operator", "*");
        if (is_generator) {
            next();
        }

        var name = is("name") ? as_symbol(in_statement ? AST_SymbolDefun : AST_SymbolLambda) : null;
        if (in_statement && !name) {
            if (is_export_default) {
                ctor = AST_Function;
            } else {
                unexpected();
            }
        }

        if (name && ctor !== AST_Accessor && !(name instanceof AST_SymbolDeclaration))
            unexpected(prev());

        var args = [];
        var body = _function_body(true, is_generator || is_generator_property, is_async, name, args);
        return new ctor({
            start : args.start,
            end   : body.end,
            is_generator: is_generator,
            async : is_async,
            name  : name,
            argnames: args,
            body  : body
        });
    };

    class UsedParametersTracker {
        constructor(is_parameter, strict, duplicates_ok = false) {
            this.is_parameter = is_parameter;
            this.duplicates_ok = duplicates_ok;
            this.parameters = new Set();
            this.duplicate = null;
            this.default_assignment = false;
            this.spread = false;
            this.strict_mode = !!strict;
        }
        add_parameter(token) {
            if (this.parameters.has(token.value)) {
                if (this.duplicate === null) {
                    this.duplicate = token;
                }
                this.check_strict();
            } else {
                this.parameters.add(token.value);
                if (this.is_parameter) {
                    switch (token.value) {
                      case "arguments":
                      case "eval":
                      case "yield":
                        if (this.strict_mode) {
                            token_error(token, "Unexpected " + token.value + " identifier as parameter inside strict mode");
                        }
                        break;
                      default:
                        if (RESERVED_WORDS.has(token.value)) {
                            unexpected();
                        }
                    }
                }
            }
        }
        mark_default_assignment(token) {
            if (this.default_assignment === false) {
                this.default_assignment = token;
            }
        }
        mark_spread(token) {
            if (this.spread === false) {
                this.spread = token;
            }
        }
        mark_strict_mode() {
            this.strict_mode = true;
        }
        is_strict() {
            return this.default_assignment !== false || this.spread !== false || this.strict_mode;
        }
        check_strict() {
            if (this.is_strict() && this.duplicate !== null && !this.duplicates_ok) {
                token_error(this.duplicate, "Parameter " + this.duplicate.value + " was used already");
            }
        }
    }

    function parameters(params) {
        var used_parameters = new UsedParametersTracker(true, S.input.has_directive("use strict"));

        expect("(");

        while (!is("punc", ")")) {
            var param = parameter(used_parameters);
            params.push(param);

            if (!is("punc", ")")) {
                expect(",");
            }

            if (param instanceof AST_Expansion) {
                break;
            }
        }

        next();
    }

    function parameter(used_parameters, symbol_type) {
        var param;
        var expand = false;
        if (used_parameters === undefined) {
            used_parameters = new UsedParametersTracker(true, S.input.has_directive("use strict"));
        }
        if (is("expand", "...")) {
            expand = S.token;
            used_parameters.mark_spread(S.token);
            next();
        }
        param = binding_element(used_parameters, symbol_type);

        if (is("operator", "=") && expand === false) {
            used_parameters.mark_default_assignment(S.token);
            next();
            param = new AST_DefaultAssign({
                start: param.start,
                left: param,
                operator: "=",
                right: expression(false),
                end: S.token
            });
        }

        if (expand !== false) {
            if (!is("punc", ")")) {
                unexpected();
            }
            param = new AST_Expansion({
                start: expand,
                expression: param,
                end: expand
            });
        }
        used_parameters.check_strict();

        return param;
    }

    function binding_element(used_parameters, symbol_type) {
        var elements = [];
        var first = true;
        var is_expand = false;
        var expand_token;
        var first_token = S.token;
        if (used_parameters === undefined) {
            const strict = S.input.has_directive("use strict");
            const duplicates_ok = symbol_type === AST_SymbolVar;
            used_parameters = new UsedParametersTracker(false, strict, duplicates_ok);
        }
        symbol_type = symbol_type === undefined ? AST_SymbolFunarg : symbol_type;
        if (is("punc", "[")) {
            next();
            while (!is("punc", "]")) {
                if (first) {
                    first = false;
                } else {
                    expect(",");
                }

                if (is("expand", "...")) {
                    is_expand = true;
                    expand_token = S.token;
                    used_parameters.mark_spread(S.token);
                    next();
                }
                if (is("punc")) {
                    switch (S.token.value) {
                      case ",":
                        elements.push(new AST_Hole({
                            start: S.token,
                            end: S.token
                        }));
                        continue;
                      case "]": // Trailing comma after last element
                        break;
                      case "[":
                      case "{":
                        elements.push(binding_element(used_parameters, symbol_type));
                        break;
                      default:
                        unexpected();
                    }
                } else if (is("name")) {
                    used_parameters.add_parameter(S.token);
                    elements.push(as_symbol(symbol_type));
                } else {
                    croak("Invalid function parameter");
                }
                if (is("operator", "=") && is_expand === false) {
                    used_parameters.mark_default_assignment(S.token);
                    next();
                    elements[elements.length - 1] = new AST_DefaultAssign({
                        start: elements[elements.length - 1].start,
                        left: elements[elements.length - 1],
                        operator: "=",
                        right: expression(false),
                        end: S.token
                    });
                }
                if (is_expand) {
                    if (!is("punc", "]")) {
                        croak("Rest element must be last element");
                    }
                    elements[elements.length - 1] = new AST_Expansion({
                        start: expand_token,
                        expression: elements[elements.length - 1],
                        end: expand_token
                    });
                }
            }
            expect("]");
            used_parameters.check_strict();
            return new AST_Destructuring({
                start: first_token,
                names: elements,
                is_array: true,
                end: prev()
            });
        } else if (is("punc", "{")) {
            next();
            while (!is("punc", "}")) {
                if (first) {
                    first = false;
                } else {
                    expect(",");
                }
                if (is("expand", "...")) {
                    is_expand = true;
                    expand_token = S.token;
                    used_parameters.mark_spread(S.token);
                    next();
                }
                if (is("name") && (is_token(peek(), "punc") || is_token(peek(), "operator")) && [",", "}", "="].includes(peek().value)) {
                    used_parameters.add_parameter(S.token);
                    var start = prev();
                    var value = as_symbol(symbol_type);
                    if (is_expand) {
                        elements.push(new AST_Expansion({
                            start: expand_token,
                            expression: value,
                            end: value.end,
                        }));
                    } else {
                        elements.push(new AST_ObjectKeyVal({
                            start: start,
                            key: value.name,
                            value: value,
                            end: value.end,
                        }));
                    }
                } else if (is("punc", "}")) {
                    continue; // Allow trailing hole
                } else {
                    var property_token = S.token;
                    var property = as_property_name();
                    if (property === null) {
                        unexpected(prev());
                    } else if (prev().type === "name" && !is("punc", ":")) {
                        elements.push(new AST_ObjectKeyVal({
                            start: prev(),
                            key: property,
                            value: new symbol_type({
                                start: prev(),
                                name: property,
                                end: prev()
                            }),
                            end: prev()
                        }));
                    } else {
                        expect(":");
                        elements.push(new AST_ObjectKeyVal({
                            start: property_token,
                            quote: property_token.quote,
                            key: property,
                            value: binding_element(used_parameters, symbol_type),
                            end: prev()
                        }));
                    }
                }
                if (is_expand) {
                    if (!is("punc", "}")) {
                        croak("Rest element must be last element");
                    }
                } else if (is("operator", "=")) {
                    used_parameters.mark_default_assignment(S.token);
                    next();
                    elements[elements.length - 1].value = new AST_DefaultAssign({
                        start: elements[elements.length - 1].value.start,
                        left: elements[elements.length - 1].value,
                        operator: "=",
                        right: expression(false),
                        end: S.token
                    });
                }
            }
            expect("}");
            used_parameters.check_strict();
            return new AST_Destructuring({
                start: first_token,
                names: elements,
                is_array: false,
                end: prev()
            });
        } else if (is("name")) {
            used_parameters.add_parameter(S.token);
            return as_symbol(symbol_type);
        } else {
            croak("Invalid function parameter");
        }
    }

    function params_or_seq_(allow_arrows, maybe_sequence) {
        var spread_token;
        var invalid_sequence;
        var trailing_comma;
        var a = [];
        expect("(");
        while (!is("punc", ")")) {
            if (spread_token) unexpected(spread_token);
            if (is("expand", "...")) {
                spread_token = S.token;
                if (maybe_sequence) invalid_sequence = S.token;
                next();
                a.push(new AST_Expansion({
                    start: prev(),
                    expression: expression(),
                    end: S.token,
                }));
            } else {
                a.push(expression());
            }
            if (!is("punc", ")")) {
                expect(",");
                if (is("punc", ")")) {
                    trailing_comma = prev();
                    if (maybe_sequence) invalid_sequence = trailing_comma;
                }
            }
        }
        expect(")");
        if (allow_arrows && is("arrow", "=>")) {
            if (spread_token && trailing_comma) unexpected(trailing_comma);
        } else if (invalid_sequence) {
            unexpected(invalid_sequence);
        }
        return a;
    }

    function _function_body(block, generator, is_async, name, args) {
        var loop = S.in_loop;
        var labels = S.labels;
        var current_generator = S.in_generator;
        var current_async = S.in_async;
        ++S.in_function;
        if (generator)
            S.in_generator = S.in_function;
        if (is_async)
            S.in_async = S.in_function;
        if (args) parameters(args);
        if (block)
            S.in_directives = true;
        S.in_loop = 0;
        S.labels = [];
        if (block) {
            S.input.push_directives_stack();
            var a = block_();
            if (name) _verify_symbol(name);
            if (args) args.forEach(_verify_symbol);
            S.input.pop_directives_stack();
        } else {
            var a = [new AST_Return({
                start: S.token,
                value: expression(false),
                end: S.token
            })];
        }
        --S.in_function;
        S.in_loop = loop;
        S.labels = labels;
        S.in_generator = current_generator;
        S.in_async = current_async;
        return a;
    }

    function _await_expression() {
        // Previous token must be "await" and not be interpreted as an identifier
        if (!can_await()) {
            croak("Unexpected await expression outside async function",
                S.prev.line, S.prev.col, S.prev.pos);
        }
        // the await expression is parsed as a unary expression in Babel
        return new AST_Await({
            start: prev(),
            end: S.token,
            expression : maybe_unary(true),
        });
    }

    function _yield_expression() {
        // Previous token must be keyword yield and not be interpret as an identifier
        if (!is_in_generator()) {
            croak("Unexpected yield expression outside generator function",
                S.prev.line, S.prev.col, S.prev.pos);
        }
        var start = S.token;
        var star = false;
        var has_expression = true;

        // Attempt to get expression or star (and then the mandatory expression)
        // behind yield on the same line.
        //
        // If nothing follows on the same line of the yieldExpression,
        // it should default to the value `undefined` for yield to return.
        // In that case, the `undefined` stored as `null` in ast.
        //
        // Note 1: It isn't allowed for yield* to close without an expression
        // Note 2: If there is a nlb between yield and star, it is interpret as
        //         yield <explicit undefined> <inserted automatic semicolon> *
        if (can_insert_semicolon() ||
            (is("punc") && PUNC_AFTER_EXPRESSION.has(S.token.value))) {
            has_expression = false;

        } else if (is("operator", "*")) {
            star = true;
            next();
        }

        return new AST_Yield({
            start      : start,
            is_star    : star,
            expression : has_expression ? expression() : null,
            end        : prev()
        });
    }

    function if_() {
        var cond = parenthesised(), body = statement(false, false, true), belse = null;
        if (is("keyword", "else")) {
            next();
            belse = statement(false, false, true);
        }
        return new AST_If({
            condition   : cond,
            body        : body,
            alternative : belse
        });
    }

    function block_() {
        expect("{");
        var a = [];
        while (!is("punc", "}")) {
            if (is("eof")) unexpected();
            a.push(statement());
        }
        next();
        return a;
    }

    function switch_body_() {
        expect("{");
        var a = [], cur = null, branch = null, tmp;
        while (!is("punc", "}")) {
            if (is("eof")) unexpected();
            if (is("keyword", "case")) {
                if (branch) branch.end = prev();
                cur = [];
                branch = new AST_Case({
                    start      : (tmp = S.token, next(), tmp),
                    expression : expression(true),
                    body       : cur
                });
                a.push(branch);
                expect(":");
            } else if (is("keyword", "default")) {
                if (branch) branch.end = prev();
                cur = [];
                branch = new AST_Default({
                    start : (tmp = S.token, next(), expect(":"), tmp),
                    body  : cur
                });
                a.push(branch);
            } else {
                if (!cur) unexpected();
                cur.push(statement());
            }
        }
        if (branch) branch.end = prev();
        next();
        return a;
    }

    function try_() {
        var body = block_(), bcatch = null, bfinally = null;
        if (is("keyword", "catch")) {
            var start = S.token;
            next();
            if (is("punc", "{")) {
                var name = null;
            } else {
                expect("(");
                var name = parameter(undefined, AST_SymbolCatch);
                expect(")");
            }
            bcatch = new AST_Catch({
                start   : start,
                argname : name,
                body    : block_(),
                end     : prev()
            });
        }
        if (is("keyword", "finally")) {
            var start = S.token;
            next();
            bfinally = new AST_Finally({
                start : start,
                body  : block_(),
                end   : prev()
            });
        }
        if (!bcatch && !bfinally)
            croak("Missing catch/finally blocks");
        return new AST_Try({
            body     : body,
            bcatch   : bcatch,
            bfinally : bfinally
        });
    }

    function vardefs(no_in, kind) {
        var a = [];
        var def;
        for (;;) {
            var sym_type =
                kind === "var" ? AST_SymbolVar :
                kind === "const" ? AST_SymbolConst :
                kind === "let" ? AST_SymbolLet : null;
            if (is("punc", "{") || is("punc", "[")) {
                def = new AST_VarDef({
                    start: S.token,
                    name: binding_element(undefined, sym_type),
                    value: is("operator", "=") ? (expect_token("operator", "="), expression(false, no_in)) : null,
                    end: prev()
                });
            } else {
                def = new AST_VarDef({
                    start : S.token,
                    name  : as_symbol(sym_type),
                    value : is("operator", "=")
                        ? (next(), expression(false, no_in))
                        : !no_in && kind === "const"
                            ? croak("Missing initializer in const declaration") : null,
                    end   : prev()
                });
                if (def.name.name == "import") croak("Unexpected token: import");
            }
            a.push(def);
            if (!is("punc", ","))
                break;
            next();
        }
        return a;
    }

    var var_ = function(no_in) {
        return new AST_Var({
            start       : prev(),
            definitions : vardefs(no_in, "var"),
            end         : prev()
        });
    };

    var let_ = function(no_in) {
        return new AST_Let({
            start       : prev(),
            definitions : vardefs(no_in, "let"),
            end         : prev()
        });
    };

    var const_ = function(no_in) {
        return new AST_Const({
            start       : prev(),
            definitions : vardefs(no_in, "const"),
            end         : prev()
        });
    };

    var new_ = function(allow_calls) {
        var start = S.token;
        expect_token("operator", "new");
        if (is("punc", ".")) {
            next();
            expect_token("name", "target");
            return subscripts(new AST_NewTarget({
                start : start,
                end   : prev()
            }), allow_calls);
        }
        var newexp = expr_atom(false), args;
        if (is("punc", "(")) {
            next();
            args = expr_list(")", true);
        } else {
            args = [];
        }
        var call = new AST_New({
            start      : start,
            expression : newexp,
            args       : args,
            end        : prev()
        });
        annotate(call);
        return subscripts(call, allow_calls);
    };

    function as_atom_node() {
        var tok = S.token, ret;
        switch (tok.type) {
          case "name":
            ret = _make_symbol(AST_SymbolRef);
            break;
          case "num":
            ret = new AST_Number({
                start: tok,
                end: tok,
                value: tok.value,
                raw: LATEST_RAW
            });
            break;
          case "big_int":
            ret = new AST_BigInt({ start: tok, end: tok, value: tok.value });
            break;
          case "string":
            ret = new AST_String({
                start : tok,
                end   : tok,
                value : tok.value,
                quote : tok.quote
            });
            break;
          case "regexp":
            const [_, source, flags] = tok.value.match(/^\/(.*)\/(\w*)$/);

            ret = new AST_RegExp({ start: tok, end: tok, value: { source, flags } });
            break;
          case "atom":
            switch (tok.value) {
              case "false":
                ret = new AST_False({ start: tok, end: tok });
                break;
              case "true":
                ret = new AST_True({ start: tok, end: tok });
                break;
              case "null":
                ret = new AST_Null({ start: tok, end: tok });
                break;
            }
            break;
        }
        next();
        return ret;
    }

    function to_fun_args(ex, default_seen_above) {
        var insert_default = function(ex, default_value) {
            if (default_value) {
                return new AST_DefaultAssign({
                    start: ex.start,
                    left: ex,
                    operator: "=",
                    right: default_value,
                    end: default_value.end
                });
            }
            return ex;
        };
        if (ex instanceof AST_Object) {
            return insert_default(new AST_Destructuring({
                start: ex.start,
                end: ex.end,
                is_array: false,
                names: ex.properties.map(prop => to_fun_args(prop))
            }), default_seen_above);
        } else if (ex instanceof AST_ObjectKeyVal) {
            ex.value = to_fun_args(ex.value);
            return insert_default(ex, default_seen_above);
        } else if (ex instanceof AST_Hole) {
            return ex;
        } else if (ex instanceof AST_Destructuring) {
            ex.names = ex.names.map(name => to_fun_args(name));
            return insert_default(ex, default_seen_above);
        } else if (ex instanceof AST_SymbolRef) {
            return insert_default(new AST_SymbolFunarg({
                name: ex.name,
                start: ex.start,
                end: ex.end
            }), default_seen_above);
        } else if (ex instanceof AST_Expansion) {
            ex.expression = to_fun_args(ex.expression);
            return insert_default(ex, default_seen_above);
        } else if (ex instanceof AST_Array) {
            return insert_default(new AST_Destructuring({
                start: ex.start,
                end: ex.end,
                is_array: true,
                names: ex.elements.map(elm => to_fun_args(elm))
            }), default_seen_above);
        } else if (ex instanceof AST_Assign) {
            return insert_default(to_fun_args(ex.left, ex.right), default_seen_above);
        } else if (ex instanceof AST_DefaultAssign) {
            ex.left = to_fun_args(ex.left);
            return ex;
        } else {
            croak("Invalid function parameter", ex.start.line, ex.start.col);
        }
    }

    var expr_atom = function(allow_calls, allow_arrows) {
        if (is("operator", "new")) {
            return new_(allow_calls);
        }
        if (is("operator", "import")) {
            return import_meta();
        }
        var start = S.token;
        var peeked;
        var async = is("name", "async")
            && (peeked = peek()).value != "["
            && peeked.type != "arrow"
            && as_atom_node();
        if (is("punc")) {
            switch (S.token.value) {
              case "(":
                if (async && !allow_calls) break;
                var exprs = params_or_seq_(allow_arrows, !async);
                if (allow_arrows && is("arrow", "=>")) {
                    return arrow_function(start, exprs.map(e => to_fun_args(e)), !!async);
                }
                var ex = async ? new AST_Call({
                    expression: async,
                    args: exprs
                }) : exprs.length == 1 ? exprs[0] : new AST_Sequence({
                    expressions: exprs
                });
                if (ex.start) {
                    const outer_comments_before = start.comments_before.length;
                    outer_comments_before_counts.set(start, outer_comments_before);
                    ex.start.comments_before.unshift(...start.comments_before);
                    start.comments_before = ex.start.comments_before;
                    if (outer_comments_before == 0 && start.comments_before.length > 0) {
                        var comment = start.comments_before[0];
                        if (!comment.nlb) {
                            comment.nlb = start.nlb;
                            start.nlb = false;
                        }
                    }
                    start.comments_after = ex.start.comments_after;
                }
                ex.start = start;
                var end = prev();
                if (ex.end) {
                    end.comments_before = ex.end.comments_before;
                    ex.end.comments_after.push(...end.comments_after);
                    end.comments_after = ex.end.comments_after;
                }
                ex.end = end;
                if (ex instanceof AST_Call) annotate(ex);
                return subscripts(ex, allow_calls);
              case "[":
                return subscripts(array_(), allow_calls);
              case "{":
                return subscripts(object_or_destructuring_(), allow_calls);
            }
            if (!async) unexpected();
        }
        if (allow_arrows && is("name") && is_token(peek(), "arrow")) {
            var param = new AST_SymbolFunarg({
                name: S.token.value,
                start: start,
                end: start,
            });
            next();
            return arrow_function(start, [param], !!async);
        }
        if (is("keyword", "function")) {
            next();
            var func = function_(AST_Function, false, !!async);
            func.start = start;
            func.end = prev();
            return subscripts(func, allow_calls);
        }
        if (async) return subscripts(async, allow_calls);
        if (is("keyword", "class")) {
            next();
            var cls = class_(AST_ClassExpression);
            cls.start = start;
            cls.end = prev();
            return subscripts(cls, allow_calls);
        }
        if (is("template_head")) {
            return subscripts(template_string(), allow_calls);
        }
        if (ATOMIC_START_TOKEN.has(S.token.type)) {
            return subscripts(as_atom_node(), allow_calls);
        }
        unexpected();
    };

    function template_string() {
        var segments = [], start = S.token;

        segments.push(new AST_TemplateSegment({
            start: S.token,
            raw: TEMPLATE_RAWS.get(S.token),
            value: S.token.value,
            end: S.token
        }));

        while (!S.token.template_end) {
            next();
            handle_regexp();
            segments.push(expression(true));

            segments.push(new AST_TemplateSegment({
                start: S.token,
                raw: TEMPLATE_RAWS.get(S.token),
                value: S.token.value,
                end: S.token
            }));
        }
        next();

        return new AST_TemplateString({
            start: start,
            segments: segments,
            end: S.token
        });
    }

    function expr_list(closing, allow_trailing_comma, allow_empty) {
        var first = true, a = [];
        while (!is("punc", closing)) {
            if (first) first = false; else expect(",");
            if (allow_trailing_comma && is("punc", closing)) break;
            if (is("punc", ",") && allow_empty) {
                a.push(new AST_Hole({ start: S.token, end: S.token }));
            } else if (is("expand", "...")) {
                next();
                a.push(new AST_Expansion({start: prev(), expression: expression(),end: S.token}));
            } else {
                a.push(expression(false));
            }
        }
        next();
        return a;
    }

    var array_ = embed_tokens(function() {
        expect("[");
        return new AST_Array({
            elements: expr_list("]", !options.strict, true)
        });
    });

    var create_accessor = embed_tokens((is_generator, is_async) => {
        return function_(AST_Accessor, is_generator, is_async);
    });

    var object_or_destructuring_ = embed_tokens(function object_or_destructuring_() {
        var start = S.token, first = true, a = [];
        expect("{");
        while (!is("punc", "}")) {
            if (first) first = false; else expect(",");
            if (!options.strict && is("punc", "}"))
                // allow trailing comma
                break;

            start = S.token;
            if (start.type == "expand") {
                next();
                a.push(new AST_Expansion({
                    start: start,
                    expression: expression(false),
                    end: prev(),
                }));
                continue;
            }

            var name = as_property_name();
            var value;

            // Check property and fetch value
            if (!is("punc", ":")) {
                var concise = concise_method_or_getset(name, start);
                if (concise) {
                    a.push(concise);
                    continue;
                }

                value = new AST_SymbolRef({
                    start: prev(),
                    name: name,
                    end: prev()
                });
            } else if (name === null) {
                unexpected(prev());
            } else {
                next(); // `:` - see first condition
                value = expression(false);
            }

            // Check for default value and alter value accordingly if necessary
            if (is("operator", "=")) {
                next();
                value = new AST_Assign({
                    start: start,
                    left: value,
                    operator: "=",
                    right: expression(false),
                    logical: false,
                    end: prev()
                });
            }

            // Create property
            a.push(new AST_ObjectKeyVal({
                start: start,
                quote: start.quote,
                key: name instanceof AST_Node ? name : "" + name,
                value: value,
                end: prev()
            }));
        }
        next();
        return new AST_Object({ properties: a });
    });

    function class_(KindOfClass, is_export_default) {
        var start, method, class_name, extends_, a = [];

        S.input.push_directives_stack(); // Push directive stack, but not scope stack
        S.input.add_directive("use strict");

        if (S.token.type == "name" && S.token.value != "extends") {
            class_name = as_symbol(KindOfClass === AST_DefClass ? AST_SymbolDefClass : AST_SymbolClass);
        }

        if (KindOfClass === AST_DefClass && !class_name) {
            if (is_export_default) {
                KindOfClass = AST_ClassExpression;
            } else {
                unexpected();
            }
        }

        if (S.token.value == "extends") {
            next();
            extends_ = expression(true);
        }

        expect("{");

        while (is("punc", ";")) { next(); }  // Leading semicolons are okay in class bodies.
        while (!is("punc", "}")) {
            start = S.token;
            method = concise_method_or_getset(as_property_name(), start, true);
            if (!method) { unexpected(); }
            a.push(method);
            while (is("punc", ";")) { next(); }
        }

        S.input.pop_directives_stack();

        next();

        return new KindOfClass({
            start: start,
            name: class_name,
            extends: extends_,
            properties: a,
            end: prev(),
        });
    }

    function concise_method_or_getset(name, start, is_class) {
        const get_symbol_ast = (name, SymbolClass = AST_SymbolMethod) => {
            if (typeof name === "string" || typeof name === "number") {
                return new SymbolClass({
                    start,
                    name: "" + name,
                    end: prev()
                });
            } else if (name === null) {
                unexpected();
            }
            return name;
        };

        const is_not_method_start = () =>
            !is("punc", "(") && !is("punc", ",") && !is("punc", "}") && !is("punc", ";") && !is("operator", "=");

        var is_async = false;
        var is_static = false;
        var is_generator = false;
        var is_private = false;
        var accessor_type = null;

        if (is_class && name === "static" && is_not_method_start()) {
            const static_block = class_static_block();
            if (static_block != null) {
                return static_block;
            }
            is_static = true;
            name = as_property_name();
        }
        if (name === "async" && is_not_method_start()) {
            is_async = true;
            name = as_property_name();
        }
        if (prev().type === "operator" && prev().value === "*") {
            is_generator = true;
            name = as_property_name();
        }
        if ((name === "get" || name === "set") && is_not_method_start()) {
            accessor_type = name;
            name = as_property_name();
        }
        if (prev().type === "privatename") {
            is_private = true;
        }

        const property_token = prev();

        if (accessor_type != null) {
            if (!is_private) {
                const AccessorClass = accessor_type === "get"
                    ? AST_ObjectGetter
                    : AST_ObjectSetter;

                name = get_symbol_ast(name);
                return new AccessorClass({
                    start,
                    static: is_static,
                    key: name,
                    quote: name instanceof AST_SymbolMethod ? property_token.quote : undefined,
                    value: create_accessor(),
                    end: prev()
                });
            } else {
                const AccessorClass = accessor_type === "get"
                    ? AST_PrivateGetter
                    : AST_PrivateSetter;

                return new AccessorClass({
                    start,
                    static: is_static,
                    key: get_symbol_ast(name),
                    value: create_accessor(),
                    end: prev(),
                });
            }
        }

        if (is("punc", "(")) {
            name = get_symbol_ast(name);
            const AST_MethodVariant = is_private
                ? AST_PrivateMethod
                : AST_ConciseMethod;
            var node = new AST_MethodVariant({
                start       : start,
                static      : is_static,
                is_generator: is_generator,
                async       : is_async,
                key         : name,
                quote       : name instanceof AST_SymbolMethod ?
                              property_token.quote : undefined,
                value       : create_accessor(is_generator, is_async),
                end         : prev()
            });
            return node;
        }

        if (is_class) {
            const key = get_symbol_ast(name, AST_SymbolClassProperty);
            const quote = key instanceof AST_SymbolClassProperty
                ? property_token.quote
                : undefined;
            const AST_ClassPropertyVariant = is_private
                ? AST_ClassPrivateProperty
                : AST_ClassProperty;
            if (is("operator", "=")) {
                next();
                return new AST_ClassPropertyVariant({
                    start,
                    static: is_static,
                    quote,
                    key,
                    value: expression(false),
                    end: prev()
                });
            } else if (
                is("name")
                || is("privatename")
                || is("operator", "*")
                || is("punc", ";")
                || is("punc", "}")
            ) {
                return new AST_ClassPropertyVariant({
                    start,
                    static: is_static,
                    quote,
                    key,
                    end: prev()
                });
            }
        }
    }

    function class_static_block() {
        if (!is("punc", "{")) {
            return null;
        }

        const start = S.token;
        const body = [];

        next();

        while (!is("punc", "}")) {
            body.push(statement());
        }

        next();

        return new AST_ClassStaticBlock({ start, body, end: prev() });
    }

    function maybe_import_assertion() {
        if (is("name", "assert") && !has_newline_before(S.token)) {
            next();
            return object_or_destructuring_();
        }
        return null;
    }

    function import_statement() {
        var start = prev();

        var imported_name;
        var imported_names;
        if (is("name")) {
            imported_name = as_symbol(AST_SymbolImport);
        }

        if (is("punc", ",")) {
            next();
        }

        imported_names = map_names(true);

        if (imported_names || imported_name) {
            expect_token("name", "from");
        }
        var mod_str = S.token;
        if (mod_str.type !== "string") {
            unexpected();
        }
        next();

        const assert_clause = maybe_import_assertion();

        return new AST_Import({
            start,
            imported_name,
            imported_names,
            module_name: new AST_String({
                start: mod_str,
                value: mod_str.value,
                quote: mod_str.quote,
                end: mod_str,
            }),
            assert_clause,
            end: S.token,
        });
    }

    function import_meta() {
        var start = S.token;
        expect_token("operator", "import");
        expect_token("punc", ".");
        expect_token("name", "meta");
        return subscripts(new AST_ImportMeta({
            start: start,
            end: prev()
        }), false);
    }

    function map_name(is_import) {
        function make_symbol(type) {
            return new type({
                name: as_property_name(),
                start: prev(),
                end: prev()
            });
        }

        var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign;
        var type = is_import ? AST_SymbolImport : AST_SymbolExport;
        var start = S.token;
        var foreign_name;
        var name;

        if (is_import) {
            foreign_name = make_symbol(foreign_type);
        } else {
            name = make_symbol(type);
        }
        if (is("name", "as")) {
            next();  // The "as" word
            if (is_import) {
                name = make_symbol(type);
            } else {
                foreign_name = make_symbol(foreign_type);
            }
        } else if (is_import) {
            name = new type(foreign_name);
        } else {
            foreign_name = new foreign_type(name);
        }

        return new AST_NameMapping({
            start: start,
            foreign_name: foreign_name,
            name: name,
            end: prev(),
        });
    }

    function map_nameAsterisk(is_import, name) {
        var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign;
        var type = is_import ? AST_SymbolImport : AST_SymbolExport;
        var start = S.token;
        var foreign_name;
        var end = prev();

        name = name || new type({
            start: start,
            name: "*",
            end: end,
        });

        foreign_name = new foreign_type({
            start: start,
            name: "*",
            end: end,
        });

        return new AST_NameMapping({
            start: start,
            foreign_name: foreign_name,
            name: name,
            end: end,
        });
    }

    function map_names(is_import) {
        var names;
        if (is("punc", "{")) {
            next();
            names = [];
            while (!is("punc", "}")) {
                names.push(map_name(is_import));
                if (is("punc", ",")) {
                    next();
                }
            }
            next();
        } else if (is("operator", "*")) {
            var name;
            next();
            if (is_import && is("name", "as")) {
                next();  // The "as" word
                name = as_symbol(is_import ? AST_SymbolImport : AST_SymbolExportForeign);
            }
            names = [map_nameAsterisk(is_import, name)];
        }
        return names;
    }

    function export_statement() {
        var start = S.token;
        var is_default;
        var exported_names;

        if (is("keyword", "default")) {
            is_default = true;
            next();
        } else if (exported_names = map_names(false)) {
            if (is("name", "from")) {
                next();

                var mod_str = S.token;
                if (mod_str.type !== "string") {
                    unexpected();
                }
                next();

                const assert_clause = maybe_import_assertion();

                return new AST_Export({
                    start: start,
                    is_default: is_default,
                    exported_names: exported_names,
                    module_name: new AST_String({
                        start: mod_str,
                        value: mod_str.value,
                        quote: mod_str.quote,
                        end: mod_str,
                    }),
                    end: prev(),
                    assert_clause
                });
            } else {
                return new AST_Export({
                    start: start,
                    is_default: is_default,
                    exported_names: exported_names,
                    end: prev(),
                });
            }
        }

        var node;
        var exported_value;
        var exported_definition;
        if (is("punc", "{")
            || is_default
                && (is("keyword", "class") || is("keyword", "function"))
                && is_token(peek(), "punc")) {
            exported_value = expression(false);
            semicolon();
        } else if ((node = statement(is_default)) instanceof AST_Definitions && is_default) {
            unexpected(node.start);
        } else if (
            node instanceof AST_Definitions
            || node instanceof AST_Defun
            || node instanceof AST_DefClass
        ) {
            exported_definition = node;
        } else if (
            node instanceof AST_ClassExpression
            || node instanceof AST_Function
        ) {
            exported_value = node;
        } else if (node instanceof AST_SimpleStatement) {
            exported_value = node.body;
        } else {
            unexpected(node.start);
        }

        return new AST_Export({
            start: start,
            is_default: is_default,
            exported_value: exported_value,
            exported_definition: exported_definition,
            end: prev(),
            assert_clause: null
        });
    }

    function as_property_name() {
        var tmp = S.token;
        switch (tmp.type) {
          case "punc":
            if (tmp.value === "[") {
                next();
                var ex = expression(false);
                expect("]");
                return ex;
            } else unexpected(tmp);
          case "operator":
            if (tmp.value === "*") {
                next();
                return null;
            }
            if (!["delete", "in", "instanceof", "new", "typeof", "void"].includes(tmp.value)) {
                unexpected(tmp);
            }
            /* falls through */
          case "name":
          case "privatename":
          case "string":
          case "num":
          case "big_int":
          case "keyword":
          case "atom":
            next();
            return tmp.value;
          default:
            unexpected(tmp);
        }
    }

    function as_name() {
        var tmp = S.token;
        if (tmp.type != "name" && tmp.type != "privatename") unexpected();
        next();
        return tmp.value;
    }

    function _make_symbol(type) {
        var name = S.token.value;
        return new (name == "this" ? AST_This :
                    name == "super" ? AST_Super :
                    type)({
            name  : String(name),
            start : S.token,
            end   : S.token
        });
    }

    function _verify_symbol(sym) {
        var name = sym.name;
        if (is_in_generator() && name == "yield") {
            token_error(sym.start, "Yield cannot be used as identifier inside generators");
        }
        if (S.input.has_directive("use strict")) {
            if (name == "yield") {
                token_error(sym.start, "Unexpected yield identifier inside strict mode");
            }
            if (sym instanceof AST_SymbolDeclaration && (name == "arguments" || name == "eval")) {
                token_error(sym.start, "Unexpected " + name + " in strict mode");
            }
        }
    }

    function as_symbol(type, noerror) {
        if (!is("name")) {
            if (!noerror) croak("Name expected");
            return null;
        }
        var sym = _make_symbol(type);
        _verify_symbol(sym);
        next();
        return sym;
    }

    // Annotate AST_Call, AST_Lambda or AST_New with the special comments
    function annotate(node) {
        var start = node.start;
        var comments = start.comments_before;
        const comments_outside_parens = outer_comments_before_counts.get(start);
        var i = comments_outside_parens != null ? comments_outside_parens : comments.length;
        while (--i >= 0) {
            var comment = comments[i];
            if (/[@#]__/.test(comment.value)) {
                if (/[@#]__PURE__/.test(comment.value)) {
                    set_annotation(node, _PURE);
                    break;
                }
                if (/[@#]__INLINE__/.test(comment.value)) {
                    set_annotation(node, _INLINE);
                    break;
                }
                if (/[@#]__NOINLINE__/.test(comment.value)) {
                    set_annotation(node, _NOINLINE);
                    break;
                }
            }
        }
    }

    var subscripts = function(expr, allow_calls, is_chain) {
        var start = expr.start;
        if (is("punc", ".")) {
            next();
            const AST_DotVariant = is("privatename") ? AST_DotHash : AST_Dot;
            return subscripts(new AST_DotVariant({
                start      : start,
                expression : expr,
                optional   : false,
                property   : as_name(),
                end        : prev()
            }), allow_calls, is_chain);
        }
        if (is("punc", "[")) {
            next();
            var prop = expression(true);
            expect("]");
            return subscripts(new AST_Sub({
                start      : start,
                expression : expr,
                optional   : false,
                property   : prop,
                end        : prev()
            }), allow_calls, is_chain);
        }
        if (allow_calls && is("punc", "(")) {
            next();
            var call = new AST_Call({
                start      : start,
                expression : expr,
                optional   : false,
                args       : call_args(),
                end        : prev()
            });
            annotate(call);
            return subscripts(call, true, is_chain);
        }

        if (is("punc", "?.")) {
            next();

            let chain_contents;

            if (allow_calls && is("punc", "(")) {
                next();

                const call = new AST_Call({
                    start,
                    optional: true,
                    expression: expr,
                    args: call_args(),
                    end: prev()
                });
                annotate(call);

                chain_contents = subscripts(call, true, true);
            } else if (is("name") || is("privatename")) {
                const AST_DotVariant = is("privatename") ? AST_DotHash : AST_Dot;
                chain_contents = subscripts(new AST_DotVariant({
                    start,
                    expression: expr,
                    optional: true,
                    property: as_name(),
                    end: prev()
                }), allow_calls, true);
            } else if (is("punc", "[")) {
                next();
                const property = expression(true);
                expect("]");
                chain_contents = subscripts(new AST_Sub({
                    start,
                    expression: expr,
                    optional: true,
                    property,
                    end: prev()
                }), allow_calls, true);
            }

            if (!chain_contents) unexpected();

            if (chain_contents instanceof AST_Chain) return chain_contents;

            return new AST_Chain({
                start,
                expression: chain_contents,
                end: prev()
            });
        }

        if (is("template_head")) {
            if (is_chain) {
                // a?.b`c` is a syntax error
                unexpected();
            }

            return subscripts(new AST_PrefixedTemplateString({
                start: start,
                prefix: expr,
                template_string: template_string(),
                end: prev()
            }), allow_calls);
        }

        return expr;
    };

    function call_args() {
        var args = [];
        while (!is("punc", ")")) {
            if (is("expand", "...")) {
                next();
                args.push(new AST_Expansion({
                    start: prev(),
                    expression: expression(false),
                    end: prev()
                }));
            } else {
                args.push(expression(false));
            }
            if (!is("punc", ")")) {
                expect(",");
            }
        }
        next();
        return args;
    }

    var maybe_unary = function(allow_calls, allow_arrows) {
        var start = S.token;
        if (start.type == "name" && start.value == "await" && can_await()) {
            next();
            return _await_expression();
        }
        if (is("operator") && UNARY_PREFIX.has(start.value)) {
            next();
            handle_regexp();
            var ex = make_unary(AST_UnaryPrefix, start, maybe_unary(allow_calls));
            ex.start = start;
            ex.end = prev();
            return ex;
        }
        var val = expr_atom(allow_calls, allow_arrows);
        while (is("operator") && UNARY_POSTFIX.has(S.token.value) && !has_newline_before(S.token)) {
            if (val instanceof AST_Arrow) unexpected();
            val = make_unary(AST_UnaryPostfix, S.token, val);
            val.start = start;
            val.end = S.token;
            next();
        }
        return val;
    };

    function make_unary(ctor, token, expr) {
        var op = token.value;
        switch (op) {
          case "++":
          case "--":
            if (!is_assignable(expr))
                croak("Invalid use of " + op + " operator", token.line, token.col, token.pos);
            break;
          case "delete":
            if (expr instanceof AST_SymbolRef && S.input.has_directive("use strict"))
                croak("Calling delete on expression not allowed in strict mode", expr.start.line, expr.start.col, expr.start.pos);
            break;
        }
        return new ctor({ operator: op, expression: expr });
    }

    var expr_op = function(left, min_prec, no_in) {
        var op = is("operator") ? S.token.value : null;
        if (op == "in" && no_in) op = null;
        if (op == "**" && left instanceof AST_UnaryPrefix
            /* unary token in front not allowed - parenthesis required */
            && !is_token(left.start, "punc", "(")
            && left.operator !== "--" && left.operator !== "++")
                unexpected(left.start);
        var prec = op != null ? PRECEDENCE[op] : null;
        if (prec != null && (prec > min_prec || (op === "**" && min_prec === prec))) {
            next();
            var right = expr_op(maybe_unary(true), prec, no_in);
            return expr_op(new AST_Binary({
                start    : left.start,
                left     : left,
                operator : op,
                right    : right,
                end      : right.end
            }), min_prec, no_in);
        }
        return left;
    };

    function expr_ops(no_in) {
        return expr_op(maybe_unary(true, true), 0, no_in);
    }

    var maybe_conditional = function(no_in) {
        var start = S.token;
        var expr = expr_ops(no_in);
        if (is("operator", "?")) {
            next();
            var yes = expression(false);
            expect(":");
            return new AST_Conditional({
                start       : start,
                condition   : expr,
                consequent  : yes,
                alternative : expression(false, no_in),
                end         : prev()
            });
        }
        return expr;
    };

    function is_assignable(expr) {
        return expr instanceof AST_PropAccess || expr instanceof AST_SymbolRef;
    }

    function to_destructuring(node) {
        if (node instanceof AST_Object) {
            node = new AST_Destructuring({
                start: node.start,
                names: node.properties.map(to_destructuring),
                is_array: false,
                end: node.end
            });
        } else if (node instanceof AST_Array) {
            var names = [];

            for (var i = 0; i < node.elements.length; i++) {
                // Only allow expansion as last element
                if (node.elements[i] instanceof AST_Expansion) {
                    if (i + 1 !== node.elements.length) {
                        token_error(node.elements[i].start, "Spread must the be last element in destructuring array");
                    }
                    node.elements[i].expression = to_destructuring(node.elements[i].expression);
                }

                names.push(to_destructuring(node.elements[i]));
            }

            node = new AST_Destructuring({
                start: node.start,
                names: names,
                is_array: true,
                end: node.end
            });
        } else if (node instanceof AST_ObjectProperty) {
            node.value = to_destructuring(node.value);
        } else if (node instanceof AST_Assign) {
            node = new AST_DefaultAssign({
                start: node.start,
                left: node.left,
                operator: "=",
                right: node.right,
                end: node.end
            });
        }
        return node;
    }

    // In ES6, AssignmentExpression can also be an ArrowFunction
    var maybe_assign = function(no_in) {
        handle_regexp();
        var start = S.token;

        if (start.type == "name" && start.value == "yield") {
            if (is_in_generator()) {
                next();
                return _yield_expression();
            } else if (S.input.has_directive("use strict")) {
                token_error(S.token, "Unexpected yield identifier inside strict mode");
            }
        }

        var left = maybe_conditional(no_in);
        var val = S.token.value;

        if (is("operator") && ASSIGNMENT.has(val)) {
            if (is_assignable(left) || (left = to_destructuring(left)) instanceof AST_Destructuring) {
                next();

                return new AST_Assign({
                    start    : start,
                    left     : left,
                    operator : val,
                    right    : maybe_assign(no_in),
                    logical  : LOGICAL_ASSIGNMENT.has(val),
                    end      : prev()
                });
            }
            croak("Invalid assignment");
        }
        return left;
    };

    var expression = function(commas, no_in) {
        var start = S.token;
        var exprs = [];
        while (true) {
            exprs.push(maybe_assign(no_in));
            if (!commas || !is("punc", ",")) break;
            next();
            commas = true;
        }
        return exprs.length == 1 ? exprs[0] : new AST_Sequence({
            start       : start,
            expressions : exprs,
            end         : peek()
        });
    };

    function in_loop(cont) {
        ++S.in_loop;
        var ret = cont();
        --S.in_loop;
        return ret;
    }

    if (options.expression) {
        return expression(true);
    }

    return (function parse_toplevel() {
        var start = S.token;
        var body = [];
        S.input.push_directives_stack();
        if (options.module) S.input.add_directive("use strict");
        while (!is("eof")) {
            body.push(statement());
        }
        S.input.pop_directives_stack();
        var end = prev();
        var toplevel = options.toplevel;
        if (toplevel) {
            toplevel.body = toplevel.body.concat(body);
            toplevel.end = end;
        } else {
            toplevel = new AST_Toplevel({ start: start, body: body, end: end });
        }
        TEMPLATE_RAWS = new Map();
        return toplevel;
    })();

}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

function DEFNODE(type, props, ctor, methods, base = AST_Node) {
    if (!props) props = [];
    else props = props.split(/\s+/);
    var self_props = props;
    if (base && base.PROPS)
        props = props.concat(base.PROPS);
    const proto = base && Object.create(base.prototype);
    if (proto) {
        ctor.prototype = proto;
        ctor.BASE = base;
    }
    if (base) base.SUBCLASSES.push(ctor);
    ctor.prototype.CTOR = ctor;
    ctor.prototype.constructor = ctor;
    ctor.PROPS = props || null;
    ctor.SELF_PROPS = self_props;
    ctor.SUBCLASSES = [];
    if (type) {
        ctor.prototype.TYPE = ctor.TYPE = type;
    }
    if (methods) for (let i in methods) if (HOP(methods, i)) {
        if (i[0] === "$") {
            ctor[i.substr(1)] = methods[i];
        } else {
            ctor.prototype[i] = methods[i];
        }
    }
    ctor.DEFMETHOD = function(name, method) {
        this.prototype[name] = method;
    };
    return ctor;
}

const has_tok_flag = (tok, flag) => Boolean(tok.flags & flag);
const set_tok_flag = (tok, flag, truth) => {
    if (truth) {
        tok.flags |= flag;
    } else {
        tok.flags &= ~flag;
    }
};

const TOK_FLAG_NLB          = 0b0001;
const TOK_FLAG_QUOTE_SINGLE = 0b0010;
const TOK_FLAG_QUOTE_EXISTS = 0b0100;
const TOK_FLAG_TEMPLATE_END = 0b1000;

class AST_Token {
    constructor(type, value, line, col, pos, nlb, comments_before, comments_after, file) {
        this.flags = (nlb ? 1 : 0);

        this.type = type;
        this.value = value;
        this.line = line;
        this.col = col;
        this.pos = pos;
        this.comments_before = comments_before;
        this.comments_after = comments_after;
        this.file = file;

        Object.seal(this);
    }

    get nlb() {
        return has_tok_flag(this, TOK_FLAG_NLB);
    }

    set nlb(new_nlb) {
        set_tok_flag(this, TOK_FLAG_NLB, new_nlb);
    }

    get quote() {
        return !has_tok_flag(this, TOK_FLAG_QUOTE_EXISTS)
            ? ""
            : (has_tok_flag(this, TOK_FLAG_QUOTE_SINGLE) ? "'" : '"');
    }

    set quote(quote_type) {
        set_tok_flag(this, TOK_FLAG_QUOTE_SINGLE, quote_type === "'");
        set_tok_flag(this, TOK_FLAG_QUOTE_EXISTS, !!quote_type);
    }

    get template_end() {
        return has_tok_flag(this, TOK_FLAG_TEMPLATE_END);
    }

    set template_end(new_template_end) {
        set_tok_flag(this, TOK_FLAG_TEMPLATE_END, new_template_end);
    }
}

var AST_Node = DEFNODE("Node", "start end", function AST_Node(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    _clone: function(deep) {
        if (deep) {
            var self = this.clone();
            return self.transform(new TreeTransformer(function(node) {
                if (node !== self) {
                    return node.clone(true);
                }
            }));
        }
        return new this.CTOR(this);
    },
    clone: function(deep) {
        return this._clone(deep);
    },
    $documentation: "Base class of all AST nodes",
    $propdoc: {
        start: "[AST_Token] The first token of this node",
        end: "[AST_Token] The last token of this node"
    },
    _walk: function(visitor) {
        return visitor._visit(this);
    },
    walk: function(visitor) {
        return this._walk(visitor); // not sure the indirection will be any help
    },
    _children_backwards: () => {}
}, null);

/* -----[ statements ]----- */

var AST_Statement = DEFNODE("Statement", null, function AST_Statement(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class of all statements",
});

var AST_Debugger = DEFNODE("Debugger", null, function AST_Debugger(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Represents a debugger statement",
}, AST_Statement);

var AST_Directive = DEFNODE("Directive", "value quote", function AST_Directive(props) {
    if (props) {
        this.value = props.value;
        this.quote = props.quote;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Represents a directive, like \"use strict\";",
    $propdoc: {
        value: "[string] The value of this directive as a plain string (it's not an AST_String!)",
        quote: "[string] the original quote character"
    },
}, AST_Statement);

var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", function AST_SimpleStatement(props) {
    if (props) {
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A statement consisting of an expression, i.e. a = 1 + 2",
    $propdoc: {
        body: "[AST_Node] an expression node (should not be instanceof AST_Statement)"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
    }
}, AST_Statement);

function walk_body(node, visitor) {
    const body = node.body;
    for (var i = 0, len = body.length; i < len; i++) {
        body[i]._walk(visitor);
    }
}

function clone_block_scope(deep) {
    var clone = this._clone(deep);
    if (this.block_scope) {
        clone.block_scope = this.block_scope.clone();
    }
    return clone;
}

var AST_Block = DEFNODE("Block", "body block_scope", function AST_Block(props) {
    if (props) {
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A body of statements (usually braced)",
    $propdoc: {
        body: "[AST_Statement*] an array of statements",
        block_scope: "[AST_Scope] the block scope"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            walk_body(this, visitor);
        });
    },
    _children_backwards(push) {
        let i = this.body.length;
        while (i--) push(this.body[i]);
    },
    clone: clone_block_scope
}, AST_Statement);

var AST_BlockStatement = DEFNODE("BlockStatement", null, function AST_BlockStatement(props) {
    if (props) {
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A block statement",
}, AST_Block);

var AST_EmptyStatement = DEFNODE("EmptyStatement", null, function AST_EmptyStatement(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The empty statement (empty block or simply a semicolon)"
}, AST_Statement);

var AST_StatementWithBody = DEFNODE("StatementWithBody", "body", function AST_StatementWithBody(props) {
    if (props) {
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for all statements that contain one nested body: `For`, `ForIn`, `Do`, `While`, `With`",
    $propdoc: {
        body: "[AST_Statement] the body; this should always be present, even if it's an AST_EmptyStatement"
    }
}, AST_Statement);

var AST_LabeledStatement = DEFNODE("LabeledStatement", "label", function AST_LabeledStatement(props) {
    if (props) {
        this.label = props.label;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Statement with a label",
    $propdoc: {
        label: "[AST_Label] a label definition"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.label._walk(visitor);
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
        push(this.label);
    },
    clone: function(deep) {
        var node = this._clone(deep);
        if (deep) {
            var label = node.label;
            var def = this.label;
            node.walk(new TreeWalker(function(node) {
                if (node instanceof AST_LoopControl
                    && node.label && node.label.thedef === def) {
                    node.label.thedef = label;
                    label.references.push(node);
                }
            }));
        }
        return node;
    }
}, AST_StatementWithBody);

var AST_IterationStatement = DEFNODE(
    "IterationStatement",
    "block_scope",
    function AST_IterationStatement(props) {
        if (props) {
            this.block_scope = props.block_scope;
            this.body = props.body;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Internal class.  All loops inherit from it.",
        $propdoc: {
            block_scope: "[AST_Scope] the block scope for this iteration statement."
        },
        clone: clone_block_scope
    },
    AST_StatementWithBody
);

var AST_DWLoop = DEFNODE("DWLoop", "condition", function AST_DWLoop(props) {
    if (props) {
        this.condition = props.condition;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for do/while statements",
    $propdoc: {
        condition: "[AST_Node] the loop condition.  Should not be instanceof AST_Statement"
    }
}, AST_IterationStatement);

var AST_Do = DEFNODE("Do", null, function AST_Do(props) {
    if (props) {
        this.condition = props.condition;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `do` statement",
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.body._walk(visitor);
            this.condition._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.condition);
        push(this.body);
    }
}, AST_DWLoop);

var AST_While = DEFNODE("While", null, function AST_While(props) {
    if (props) {
        this.condition = props.condition;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `while` statement",
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.condition._walk(visitor);
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
        push(this.condition);
    },
}, AST_DWLoop);

var AST_For = DEFNODE("For", "init condition step", function AST_For(props) {
    if (props) {
        this.init = props.init;
        this.condition = props.condition;
        this.step = props.step;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `for` statement",
    $propdoc: {
        init: "[AST_Node?] the `for` initialization code, or null if empty",
        condition: "[AST_Node?] the `for` termination clause, or null if empty",
        step: "[AST_Node?] the `for` update clause, or null if empty"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            if (this.init) this.init._walk(visitor);
            if (this.condition) this.condition._walk(visitor);
            if (this.step) this.step._walk(visitor);
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
        if (this.step) push(this.step);
        if (this.condition) push(this.condition);
        if (this.init) push(this.init);
    },
}, AST_IterationStatement);

var AST_ForIn = DEFNODE("ForIn", "init object", function AST_ForIn(props) {
    if (props) {
        this.init = props.init;
        this.object = props.object;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `for ... in` statement",
    $propdoc: {
        init: "[AST_Node] the `for/in` initialization code",
        object: "[AST_Node] the object that we're looping through"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.init._walk(visitor);
            this.object._walk(visitor);
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
        if (this.object) push(this.object);
        if (this.init) push(this.init);
    },
}, AST_IterationStatement);

var AST_ForOf = DEFNODE("ForOf", "await", function AST_ForOf(props) {
    if (props) {
        this.await = props.await;
        this.init = props.init;
        this.object = props.object;
        this.block_scope = props.block_scope;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `for ... of` statement",
}, AST_ForIn);

var AST_With = DEFNODE("With", "expression", function AST_With(props) {
    if (props) {
        this.expression = props.expression;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `with` statement",
    $propdoc: {
        expression: "[AST_Node] the `with` expression"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
            this.body._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.body);
        push(this.expression);
    },
}, AST_StatementWithBody);

/* -----[ scope and functions ]----- */

var AST_Scope = DEFNODE(
    "Scope",
    "variables uses_with uses_eval parent_scope enclosed cname",
    function AST_Scope(props) {
        if (props) {
            this.variables = props.variables;
            this.uses_with = props.uses_with;
            this.uses_eval = props.uses_eval;
            this.parent_scope = props.parent_scope;
            this.enclosed = props.enclosed;
            this.cname = props.cname;
            this.body = props.body;
            this.block_scope = props.block_scope;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Base class for all statements introducing a lexical scope",
        $propdoc: {
            variables: "[Map/S] a map of name -> SymbolDef for all variables/functions defined in this scope",
            uses_with: "[boolean/S] tells whether this scope uses the `with` statement",
            uses_eval: "[boolean/S] tells whether this scope contains a direct call to the global `eval`",
            parent_scope: "[AST_Scope?/S] link to the parent scope",
            enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
            cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
        },
        get_defun_scope: function() {
            var self = this;
            while (self.is_block_scope()) {
                self = self.parent_scope;
            }
            return self;
        },
        clone: function(deep, toplevel) {
            var node = this._clone(deep);
            if (deep && this.variables && toplevel && !this._block_scope) {
                node.figure_out_scope({}, {
                    toplevel: toplevel,
                    parent_scope: this.parent_scope
                });
            } else {
                if (this.variables) node.variables = new Map(this.variables);
                if (this.enclosed) node.enclosed = this.enclosed.slice();
                if (this._block_scope) node._block_scope = this._block_scope;
            }
            return node;
        },
        pinned: function() {
            return this.uses_eval || this.uses_with;
        }
    },
    AST_Block
);

var AST_Toplevel = DEFNODE("Toplevel", "globals", function AST_Toplevel(props) {
    if (props) {
        this.globals = props.globals;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The toplevel scope",
    $propdoc: {
        globals: "[Map/S] a map of name -> SymbolDef for all undeclared names",
    },
    wrap_commonjs: function(name) {
        var body = this.body;
        var wrapped_tl = "(function(exports){'$ORIG';})(typeof " + name + "=='undefined'?(" + name + "={}):" + name + ");";
        wrapped_tl = parse(wrapped_tl);
        wrapped_tl = wrapped_tl.transform(new TreeTransformer(function(node) {
            if (node instanceof AST_Directive && node.value == "$ORIG") {
                return MAP.splice(body);
            }
        }));
        return wrapped_tl;
    },
    wrap_enclose: function(args_values) {
        if (typeof args_values != "string") args_values = "";
        var index = args_values.indexOf(":");
        if (index < 0) index = args_values.length;
        var body = this.body;
        return parse([
            "(function(",
            args_values.slice(0, index),
            '){"$ORIG"})(',
            args_values.slice(index + 1),
            ")"
        ].join("")).transform(new TreeTransformer(function(node) {
            if (node instanceof AST_Directive && node.value == "$ORIG") {
                return MAP.splice(body);
            }
        }));
    }
}, AST_Scope);

var AST_Expansion = DEFNODE("Expansion", "expression", function AST_Expansion(props) {
    if (props) {
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An expandible argument, such as ...rest, a splat, such as [1,2,...all], or an expansion in a variable declaration, such as var [first, ...rest] = list",
    $propdoc: {
        expression: "[AST_Node] the thing to be expanded"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression.walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
});

var AST_Lambda = DEFNODE(
    "Lambda",
    "name argnames uses_arguments is_generator async",
    function AST_Lambda(props) {
        if (props) {
            this.name = props.name;
            this.argnames = props.argnames;
            this.uses_arguments = props.uses_arguments;
            this.is_generator = props.is_generator;
            this.async = props.async;
            this.variables = props.variables;
            this.uses_with = props.uses_with;
            this.uses_eval = props.uses_eval;
            this.parent_scope = props.parent_scope;
            this.enclosed = props.enclosed;
            this.cname = props.cname;
            this.body = props.body;
            this.block_scope = props.block_scope;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Base class for functions",
        $propdoc: {
            name: "[AST_SymbolDeclaration?] the name of this function",
            argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion|AST_DefaultAssign*] array of function arguments, destructurings, or expanding arguments",
            uses_arguments: "[boolean/S] tells whether this function accesses the arguments array",
            is_generator: "[boolean] is this a generator method",
            async: "[boolean] is this method async",
        },
        args_as_names: function () {
            var out = [];
            for (var i = 0; i < this.argnames.length; i++) {
                if (this.argnames[i] instanceof AST_Destructuring) {
                    out.push(...this.argnames[i].all_symbols());
                } else {
                    out.push(this.argnames[i]);
                }
            }
            return out;
        },
        _walk: function(visitor) {
            return visitor._visit(this, function() {
                if (this.name) this.name._walk(visitor);
                var argnames = this.argnames;
                for (var i = 0, len = argnames.length; i < len; i++) {
                    argnames[i]._walk(visitor);
                }
                walk_body(this, visitor);
            });
        },
        _children_backwards(push) {
            let i = this.body.length;
            while (i--) push(this.body[i]);

            i = this.argnames.length;
            while (i--) push(this.argnames[i]);

            if (this.name) push(this.name);
        },
        is_braceless() {
            return this.body[0] instanceof AST_Return && this.body[0].value;
        },
        // Default args and expansion don't count, so .argnames.length doesn't cut it
        length_property() {
            let length = 0;

            for (const arg of this.argnames) {
                if (arg instanceof AST_SymbolFunarg || arg instanceof AST_Destructuring) {
                    length++;
                }
            }

            return length;
        }
    },
    AST_Scope
);

var AST_Accessor = DEFNODE("Accessor", null, function AST_Accessor(props) {
    if (props) {
        this.name = props.name;
        this.argnames = props.argnames;
        this.uses_arguments = props.uses_arguments;
        this.is_generator = props.is_generator;
        this.async = props.async;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A setter/getter function.  The `name` property is always null."
}, AST_Lambda);

var AST_Function = DEFNODE("Function", null, function AST_Function(props) {
    if (props) {
        this.name = props.name;
        this.argnames = props.argnames;
        this.uses_arguments = props.uses_arguments;
        this.is_generator = props.is_generator;
        this.async = props.async;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A function expression"
}, AST_Lambda);

var AST_Arrow = DEFNODE("Arrow", null, function AST_Arrow(props) {
    if (props) {
        this.name = props.name;
        this.argnames = props.argnames;
        this.uses_arguments = props.uses_arguments;
        this.is_generator = props.is_generator;
        this.async = props.async;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An ES6 Arrow function ((a) => b)"
}, AST_Lambda);

var AST_Defun = DEFNODE("Defun", null, function AST_Defun(props) {
    if (props) {
        this.name = props.name;
        this.argnames = props.argnames;
        this.uses_arguments = props.uses_arguments;
        this.is_generator = props.is_generator;
        this.async = props.async;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A function definition"
}, AST_Lambda);

/* -----[ DESTRUCTURING ]----- */
var AST_Destructuring = DEFNODE("Destructuring", "names is_array", function AST_Destructuring(props) {
    if (props) {
        this.names = props.names;
        this.is_array = props.is_array;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A destructuring of several names. Used in destructuring assignment and with destructuring function argument names",
    $propdoc: {
        "names": "[AST_Node*] Array of properties or elements",
        "is_array": "[Boolean] Whether the destructuring represents an object or array"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.names.forEach(function(name) {
                name._walk(visitor);
            });
        });
    },
    _children_backwards(push) {
        let i = this.names.length;
        while (i--) push(this.names[i]);
    },
    all_symbols: function() {
        var out = [];
        this.walk(new TreeWalker(function (node) {
            if (node instanceof AST_Symbol) {
                out.push(node);
            }
        }));
        return out;
    }
});

var AST_PrefixedTemplateString = DEFNODE(
    "PrefixedTemplateString",
    "template_string prefix",
    function AST_PrefixedTemplateString(props) {
        if (props) {
            this.template_string = props.template_string;
            this.prefix = props.prefix;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
        $propdoc: {
            template_string: "[AST_TemplateString] The template string",
            prefix: "[AST_Node] The prefix, which will get called."
        },
        _walk: function(visitor) {
            return visitor._visit(this, function () {
                this.prefix._walk(visitor);
                this.template_string._walk(visitor);
            });
        },
        _children_backwards(push) {
            push(this.template_string);
            push(this.prefix);
        },
    }
);

var AST_TemplateString = DEFNODE("TemplateString", "segments", function AST_TemplateString(props) {
    if (props) {
        this.segments = props.segments;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A template string literal",
    $propdoc: {
        segments: "[AST_Node*] One or more segments, starting with AST_TemplateSegment. AST_Node may follow AST_TemplateSegment, but each AST_Node must be followed by AST_TemplateSegment."
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.segments.forEach(function(seg) {
                seg._walk(visitor);
            });
        });
    },
    _children_backwards(push) {
        let i = this.segments.length;
        while (i--) push(this.segments[i]);
    }
});

var AST_TemplateSegment = DEFNODE("TemplateSegment", "value raw", function AST_TemplateSegment(props) {
    if (props) {
        this.value = props.value;
        this.raw = props.raw;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A segment of a template string literal",
    $propdoc: {
        value: "Content of the segment",
        raw: "Raw source of the segment",
    }
});

/* -----[ JUMPS ]----- */

var AST_Jump = DEFNODE("Jump", null, function AST_Jump(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for “jumps” (for now that's `return`, `throw`, `break` and `continue`)"
}, AST_Statement);

var AST_Exit = DEFNODE("Exit", "value", function AST_Exit(props) {
    if (props) {
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for “exits” (`return` and `throw`)",
    $propdoc: {
        value: "[AST_Node?] the value returned or thrown by this statement; could be null for AST_Return"
    },
    _walk: function(visitor) {
        return visitor._visit(this, this.value && function() {
            this.value._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.value) push(this.value);
    },
}, AST_Jump);

var AST_Return = DEFNODE("Return", null, function AST_Return(props) {
    if (props) {
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `return` statement"
}, AST_Exit);

var AST_Throw = DEFNODE("Throw", null, function AST_Throw(props) {
    if (props) {
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `throw` statement"
}, AST_Exit);

var AST_LoopControl = DEFNODE("LoopControl", "label", function AST_LoopControl(props) {
    if (props) {
        this.label = props.label;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for loop control statements (`break` and `continue`)",
    $propdoc: {
        label: "[AST_LabelRef?] the label, or null if none",
    },
    _walk: function(visitor) {
        return visitor._visit(this, this.label && function() {
            this.label._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.label) push(this.label);
    },
}, AST_Jump);

var AST_Break = DEFNODE("Break", null, function AST_Break(props) {
    if (props) {
        this.label = props.label;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `break` statement"
}, AST_LoopControl);

var AST_Continue = DEFNODE("Continue", null, function AST_Continue(props) {
    if (props) {
        this.label = props.label;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `continue` statement"
}, AST_LoopControl);

var AST_Await = DEFNODE("Await", "expression", function AST_Await(props) {
    if (props) {
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An `await` statement",
    $propdoc: {
        expression: "[AST_Node] the mandatory expression being awaited",
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
});

var AST_Yield = DEFNODE("Yield", "expression is_star", function AST_Yield(props) {
    if (props) {
        this.expression = props.expression;
        this.is_star = props.is_star;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `yield` statement",
    $propdoc: {
        expression: "[AST_Node?] the value returned or thrown by this statement; could be null (representing undefined) but only when is_star is set to false",
        is_star: "[Boolean] Whether this is a yield or yield* statement"
    },
    _walk: function(visitor) {
        return visitor._visit(this, this.expression && function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.expression) push(this.expression);
    }
});

/* -----[ IF ]----- */

var AST_If = DEFNODE("If", "condition alternative", function AST_If(props) {
    if (props) {
        this.condition = props.condition;
        this.alternative = props.alternative;
        this.body = props.body;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `if` statement",
    $propdoc: {
        condition: "[AST_Node] the `if` condition",
        alternative: "[AST_Statement?] the `else` part, or null if not present"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.condition._walk(visitor);
            this.body._walk(visitor);
            if (this.alternative) this.alternative._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.alternative) {
            push(this.alternative);
        }
        push(this.body);
        push(this.condition);
    }
}, AST_StatementWithBody);

/* -----[ SWITCH ]----- */

var AST_Switch = DEFNODE("Switch", "expression", function AST_Switch(props) {
    if (props) {
        this.expression = props.expression;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `switch` statement",
    $propdoc: {
        expression: "[AST_Node] the `switch` “discriminant”"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
            walk_body(this, visitor);
        });
    },
    _children_backwards(push) {
        let i = this.body.length;
        while (i--) push(this.body[i]);
        push(this.expression);
    }
}, AST_Block);

var AST_SwitchBranch = DEFNODE("SwitchBranch", null, function AST_SwitchBranch(props) {
    if (props) {
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for `switch` branches",
}, AST_Block);

var AST_Default = DEFNODE("Default", null, function AST_Default(props) {
    if (props) {
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `default` switch branch",
}, AST_SwitchBranch);

var AST_Case = DEFNODE("Case", "expression", function AST_Case(props) {
    if (props) {
        this.expression = props.expression;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `case` switch branch",
    $propdoc: {
        expression: "[AST_Node] the `case` expression"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
            walk_body(this, visitor);
        });
    },
    _children_backwards(push) {
        let i = this.body.length;
        while (i--) push(this.body[i]);
        push(this.expression);
    },
}, AST_SwitchBranch);

/* -----[ EXCEPTIONS ]----- */

var AST_Try = DEFNODE("Try", "bcatch bfinally", function AST_Try(props) {
    if (props) {
        this.bcatch = props.bcatch;
        this.bfinally = props.bfinally;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `try` statement",
    $propdoc: {
        bcatch: "[AST_Catch?] the catch block, or null if not present",
        bfinally: "[AST_Finally?] the finally block, or null if not present"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            walk_body(this, visitor);
            if (this.bcatch) this.bcatch._walk(visitor);
            if (this.bfinally) this.bfinally._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.bfinally) push(this.bfinally);
        if (this.bcatch) push(this.bcatch);
        let i = this.body.length;
        while (i--) push(this.body[i]);
    },
}, AST_Block);

var AST_Catch = DEFNODE("Catch", "argname", function AST_Catch(props) {
    if (props) {
        this.argname = props.argname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `catch` node; only makes sense as part of a `try` statement",
    $propdoc: {
        argname: "[AST_SymbolCatch|AST_Destructuring|AST_Expansion|AST_DefaultAssign] symbol for the exception"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            if (this.argname) this.argname._walk(visitor);
            walk_body(this, visitor);
        });
    },
    _children_backwards(push) {
        let i = this.body.length;
        while (i--) push(this.body[i]);
        if (this.argname) push(this.argname);
    },
}, AST_Block);

var AST_Finally = DEFNODE("Finally", null, function AST_Finally(props) {
    if (props) {
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `finally` node; only makes sense as part of a `try` statement"
}, AST_Block);

/* -----[ VAR/CONST ]----- */

var AST_Definitions = DEFNODE("Definitions", "definitions", function AST_Definitions(props) {
    if (props) {
        this.definitions = props.definitions;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for `var` or `const` nodes (variable declarations/initializations)",
    $propdoc: {
        definitions: "[AST_VarDef*] array of variable definitions"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            var definitions = this.definitions;
            for (var i = 0, len = definitions.length; i < len; i++) {
                definitions[i]._walk(visitor);
            }
        });
    },
    _children_backwards(push) {
        let i = this.definitions.length;
        while (i--) push(this.definitions[i]);
    },
}, AST_Statement);

var AST_Var = DEFNODE("Var", null, function AST_Var(props) {
    if (props) {
        this.definitions = props.definitions;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `var` statement"
}, AST_Definitions);

var AST_Let = DEFNODE("Let", null, function AST_Let(props) {
    if (props) {
        this.definitions = props.definitions;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `let` statement"
}, AST_Definitions);

var AST_Const = DEFNODE("Const", null, function AST_Const(props) {
    if (props) {
        this.definitions = props.definitions;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A `const` statement"
}, AST_Definitions);

var AST_VarDef = DEFNODE("VarDef", "name value", function AST_VarDef(props) {
    if (props) {
        this.name = props.name;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A variable declaration; only appears in a AST_Definitions node",
    $propdoc: {
        name: "[AST_Destructuring|AST_SymbolConst|AST_SymbolLet|AST_SymbolVar] name of the variable",
        value: "[AST_Node?] initializer, or null of there's no initializer"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.name._walk(visitor);
            if (this.value) this.value._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.value) push(this.value);
        push(this.name);
    },
});

var AST_NameMapping = DEFNODE("NameMapping", "foreign_name name", function AST_NameMapping(props) {
    if (props) {
        this.foreign_name = props.foreign_name;
        this.name = props.name;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The part of the export/import statement that declare names from a module.",
    $propdoc: {
        foreign_name: "[AST_SymbolExportForeign|AST_SymbolImportForeign] The name being exported/imported (as specified in the module)",
        name: "[AST_SymbolExport|AST_SymbolImport] The name as it is visible to this module."
    },
    _walk: function (visitor) {
        return visitor._visit(this, function() {
            this.foreign_name._walk(visitor);
            this.name._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.name);
        push(this.foreign_name);
    },
});

var AST_Import = DEFNODE(
    "Import",
    "imported_name imported_names module_name assert_clause",
    function AST_Import(props) {
        if (props) {
            this.imported_name = props.imported_name;
            this.imported_names = props.imported_names;
            this.module_name = props.module_name;
            this.assert_clause = props.assert_clause;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "An `import` statement",
        $propdoc: {
            imported_name: "[AST_SymbolImport] The name of the variable holding the module's default export.",
            imported_names: "[AST_NameMapping*] The names of non-default imported variables",
            module_name: "[AST_String] String literal describing where this module came from",
            assert_clause: "[AST_Object?] The import assertion"
        },
        _walk: function(visitor) {
            return visitor._visit(this, function() {
                if (this.imported_name) {
                    this.imported_name._walk(visitor);
                }
                if (this.imported_names) {
                    this.imported_names.forEach(function(name_import) {
                        name_import._walk(visitor);
                    });
                }
                this.module_name._walk(visitor);
            });
        },
        _children_backwards(push) {
            push(this.module_name);
            if (this.imported_names) {
                let i = this.imported_names.length;
                while (i--) push(this.imported_names[i]);
            }
            if (this.imported_name) push(this.imported_name);
        },
    }
);

var AST_ImportMeta = DEFNODE("ImportMeta", null, function AST_ImportMeta(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A reference to import.meta",
});

var AST_Export = DEFNODE(
    "Export",
    "exported_definition exported_value is_default exported_names module_name assert_clause",
    function AST_Export(props) {
        if (props) {
            this.exported_definition = props.exported_definition;
            this.exported_value = props.exported_value;
            this.is_default = props.is_default;
            this.exported_names = props.exported_names;
            this.module_name = props.module_name;
            this.assert_clause = props.assert_clause;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "An `export` statement",
        $propdoc: {
            exported_definition: "[AST_Defun|AST_Definitions|AST_DefClass?] An exported definition",
            exported_value: "[AST_Node?] An exported value",
            exported_names: "[AST_NameMapping*?] List of exported names",
            module_name: "[AST_String?] Name of the file to load exports from",
            is_default: "[Boolean] Whether this is the default exported value of this module",
            assert_clause: "[AST_Object?] The import assertion"
        },
        _walk: function (visitor) {
            return visitor._visit(this, function () {
                if (this.exported_definition) {
                    this.exported_definition._walk(visitor);
                }
                if (this.exported_value) {
                    this.exported_value._walk(visitor);
                }
                if (this.exported_names) {
                    this.exported_names.forEach(function(name_export) {
                        name_export._walk(visitor);
                    });
                }
                if (this.module_name) {
                    this.module_name._walk(visitor);
                }
            });
        },
        _children_backwards(push) {
            if (this.module_name) push(this.module_name);
            if (this.exported_names) {
                let i = this.exported_names.length;
                while (i--) push(this.exported_names[i]);
            }
            if (this.exported_value) push(this.exported_value);
            if (this.exported_definition) push(this.exported_definition);
        }
    },
    AST_Statement
);

/* -----[ OTHER ]----- */

var AST_Call = DEFNODE(
    "Call",
    "expression args optional _annotations",
    function AST_Call(props) {
        if (props) {
            this.expression = props.expression;
            this.args = props.args;
            this.optional = props.optional;
            this._annotations = props._annotations;
            this.start = props.start;
            this.end = props.end;
            this.initialize();
        }

        this.flags = 0;
    },
    {
        $documentation: "A function call expression",
        $propdoc: {
            expression: "[AST_Node] expression to invoke as function",
            args: "[AST_Node*] array of arguments",
            optional: "[boolean] whether this is an optional call (IE ?.() )",
            _annotations: "[number] bitfield containing information about the call"
        },
        initialize() {
            if (this._annotations == null) this._annotations = 0;
        },
        _walk(visitor) {
            return visitor._visit(this, function() {
                var args = this.args;
                for (var i = 0, len = args.length; i < len; i++) {
                    args[i]._walk(visitor);
                }
                this.expression._walk(visitor);  // TODO why do we need to crawl this last?
            });
        },
        _children_backwards(push) {
            let i = this.args.length;
            while (i--) push(this.args[i]);
            push(this.expression);
        },
    }
);

var AST_New = DEFNODE("New", null, function AST_New(props) {
    if (props) {
        this.expression = props.expression;
        this.args = props.args;
        this.optional = props.optional;
        this._annotations = props._annotations;
        this.start = props.start;
        this.end = props.end;
        this.initialize();
    }

    this.flags = 0;
}, {
    $documentation: "An object instantiation.  Derives from a function call since it has exactly the same properties"
}, AST_Call);

var AST_Sequence = DEFNODE("Sequence", "expressions", function AST_Sequence(props) {
    if (props) {
        this.expressions = props.expressions;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A sequence expression (comma-separated expressions)",
    $propdoc: {
        expressions: "[AST_Node*] array of expressions (at least two)"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expressions.forEach(function(node) {
                node._walk(visitor);
            });
        });
    },
    _children_backwards(push) {
        let i = this.expressions.length;
        while (i--) push(this.expressions[i]);
    },
});

var AST_PropAccess = DEFNODE(
    "PropAccess",
    "expression property optional",
    function AST_PropAccess(props) {
        if (props) {
            this.expression = props.expression;
            this.property = props.property;
            this.optional = props.optional;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Base class for property access expressions, i.e. `a.foo` or `a[\"foo\"]`",
        $propdoc: {
            expression: "[AST_Node] the “container” expression",
            property: "[AST_Node|string] the property to access.  For AST_Dot & AST_DotHash this is always a plain string, while for AST_Sub it's an arbitrary AST_Node",

            optional: "[boolean] whether this is an optional property access (IE ?.)"
        }
    }
);

var AST_Dot = DEFNODE("Dot", "quote", function AST_Dot(props) {
    if (props) {
        this.quote = props.quote;
        this.expression = props.expression;
        this.property = props.property;
        this.optional = props.optional;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A dotted property access expression",
    $propdoc: {
        quote: "[string] the original quote character when transformed from AST_Sub",
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
}, AST_PropAccess);

var AST_DotHash = DEFNODE("DotHash", "", function AST_DotHash(props) {
    if (props) {
        this.expression = props.expression;
        this.property = props.property;
        this.optional = props.optional;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A dotted property access to a private property",
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
}, AST_PropAccess);

var AST_Sub = DEFNODE("Sub", null, function AST_Sub(props) {
    if (props) {
        this.expression = props.expression;
        this.property = props.property;
        this.optional = props.optional;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Index-style property access, i.e. `a[\"foo\"]`",
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
            this.property._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.property);
        push(this.expression);
    },
}, AST_PropAccess);

var AST_Chain = DEFNODE("Chain", "expression", function AST_Chain(props) {
    if (props) {
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A chain expression like a?.b?.(c)?.[d]",
    $propdoc: {
        expression: "[AST_Call|AST_Dot|AST_DotHash|AST_Sub] chain element."
    },
    _walk: function (visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
});

var AST_Unary = DEFNODE("Unary", "operator expression", function AST_Unary(props) {
    if (props) {
        this.operator = props.operator;
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for unary expressions",
    $propdoc: {
        operator: "[string] the operator",
        expression: "[AST_Node] expression that this unary operator applies to"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.expression._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.expression);
    },
});

var AST_UnaryPrefix = DEFNODE("UnaryPrefix", null, function AST_UnaryPrefix(props) {
    if (props) {
        this.operator = props.operator;
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Unary prefix expression, i.e. `typeof i` or `++i`"
}, AST_Unary);

var AST_UnaryPostfix = DEFNODE("UnaryPostfix", null, function AST_UnaryPostfix(props) {
    if (props) {
        this.operator = props.operator;
        this.expression = props.expression;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Unary postfix expression, i.e. `i++`"
}, AST_Unary);

var AST_Binary = DEFNODE("Binary", "operator left right", function AST_Binary(props) {
    if (props) {
        this.operator = props.operator;
        this.left = props.left;
        this.right = props.right;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Binary expression, i.e. `a + b`",
    $propdoc: {
        left: "[AST_Node] left-hand side expression",
        operator: "[string] the operator",
        right: "[AST_Node] right-hand side expression"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            this.left._walk(visitor);
            this.right._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.right);
        push(this.left);
    },
});

var AST_Conditional = DEFNODE(
    "Conditional",
    "condition consequent alternative",
    function AST_Conditional(props) {
        if (props) {
            this.condition = props.condition;
            this.consequent = props.consequent;
            this.alternative = props.alternative;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Conditional expression using the ternary operator, i.e. `a ? b : c`",
        $propdoc: {
            condition: "[AST_Node]",
            consequent: "[AST_Node]",
            alternative: "[AST_Node]"
        },
        _walk: function(visitor) {
            return visitor._visit(this, function() {
                this.condition._walk(visitor);
                this.consequent._walk(visitor);
                this.alternative._walk(visitor);
            });
        },
        _children_backwards(push) {
            push(this.alternative);
            push(this.consequent);
            push(this.condition);
        },
    }
);

var AST_Assign = DEFNODE("Assign", "logical", function AST_Assign(props) {
    if (props) {
        this.logical = props.logical;
        this.operator = props.operator;
        this.left = props.left;
        this.right = props.right;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An assignment expression — `a = b + 5`",
    $propdoc: {
        logical: "Whether it's a logical assignment"
    }
}, AST_Binary);

var AST_DefaultAssign = DEFNODE("DefaultAssign", null, function AST_DefaultAssign(props) {
    if (props) {
        this.operator = props.operator;
        this.left = props.left;
        this.right = props.right;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A default assignment expression like in `(a = 3) => a`"
}, AST_Binary);

/* -----[ LITERALS ]----- */

var AST_Array = DEFNODE("Array", "elements", function AST_Array(props) {
    if (props) {
        this.elements = props.elements;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An array literal",
    $propdoc: {
        elements: "[AST_Node*] array of elements"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            var elements = this.elements;
            for (var i = 0, len = elements.length; i < len; i++) {
                elements[i]._walk(visitor);
            }
        });
    },
    _children_backwards(push) {
        let i = this.elements.length;
        while (i--) push(this.elements[i]);
    },
});

var AST_Object = DEFNODE("Object", "properties", function AST_Object(props) {
    if (props) {
        this.properties = props.properties;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "An object literal",
    $propdoc: {
        properties: "[AST_ObjectProperty*] array of properties"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            var properties = this.properties;
            for (var i = 0, len = properties.length; i < len; i++) {
                properties[i]._walk(visitor);
            }
        });
    },
    _children_backwards(push) {
        let i = this.properties.length;
        while (i--) push(this.properties[i]);
    },
});

var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", function AST_ObjectProperty(props) {
    if (props) {
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for literal object properties",
    $propdoc: {
        key: "[string|AST_Node] property name. For ObjectKeyVal this is a string. For getters, setters and computed property this is an AST_Node.",
        value: "[AST_Node] property value.  For getters and setters this is an AST_Accessor."
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            if (this.key instanceof AST_Node)
                this.key._walk(visitor);
            this.value._walk(visitor);
        });
    },
    _children_backwards(push) {
        push(this.value);
        if (this.key instanceof AST_Node) push(this.key);
    }
});

var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", function AST_ObjectKeyVal(props) {
    if (props) {
        this.quote = props.quote;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A key: value object property",
    $propdoc: {
        quote: "[string] the original quote character"
    },
    computed_key() {
        return this.key instanceof AST_Node;
    }
}, AST_ObjectProperty);

var AST_PrivateSetter = DEFNODE("PrivateSetter", "static", function AST_PrivateSetter(props) {
    if (props) {
        this.static = props.static;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        static: "[boolean] whether this is a static private setter"
    },
    $documentation: "A private setter property",
    computed_key() {
        return false;
    }
}, AST_ObjectProperty);

var AST_PrivateGetter = DEFNODE("PrivateGetter", "static", function AST_PrivateGetter(props) {
    if (props) {
        this.static = props.static;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        static: "[boolean] whether this is a static private getter"
    },
    $documentation: "A private getter property",
    computed_key() {
        return false;
    }
}, AST_ObjectProperty);

var AST_ObjectSetter = DEFNODE("ObjectSetter", "quote static", function AST_ObjectSetter(props) {
    if (props) {
        this.quote = props.quote;
        this.static = props.static;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        quote: "[string|undefined] the original quote character, if any",
        static: "[boolean] whether this is a static setter (classes only)"
    },
    $documentation: "An object setter property",
    computed_key() {
        return !(this.key instanceof AST_SymbolMethod);
    }
}, AST_ObjectProperty);

var AST_ObjectGetter = DEFNODE("ObjectGetter", "quote static", function AST_ObjectGetter(props) {
    if (props) {
        this.quote = props.quote;
        this.static = props.static;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        quote: "[string|undefined] the original quote character, if any",
        static: "[boolean] whether this is a static getter (classes only)"
    },
    $documentation: "An object getter property",
    computed_key() {
        return !(this.key instanceof AST_SymbolMethod);
    }
}, AST_ObjectProperty);

var AST_ConciseMethod = DEFNODE(
    "ConciseMethod",
    "quote static is_generator async",
    function AST_ConciseMethod(props) {
        if (props) {
            this.quote = props.quote;
            this.static = props.static;
            this.is_generator = props.is_generator;
            this.async = props.async;
            this.key = props.key;
            this.value = props.value;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $propdoc: {
            quote: "[string|undefined] the original quote character, if any",
            static: "[boolean] is this method static (classes only)",
            is_generator: "[boolean] is this a generator method",
            async: "[boolean] is this method async",
        },
        $documentation: "An ES6 concise method inside an object or class",
        computed_key() {
            return !(this.key instanceof AST_SymbolMethod);
        }
    },
    AST_ObjectProperty
);

var AST_PrivateMethod = DEFNODE("PrivateMethod", "", function AST_PrivateMethod(props) {
    if (props) {
        this.quote = props.quote;
        this.static = props.static;
        this.is_generator = props.is_generator;
        this.async = props.async;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A private class method inside a class",
}, AST_ConciseMethod);

var AST_Class = DEFNODE("Class", "name extends properties", function AST_Class(props) {
    if (props) {
        this.name = props.name;
        this.extends = props.extends;
        this.properties = props.properties;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        name: "[AST_SymbolClass|AST_SymbolDefClass?] optional class name.",
        extends: "[AST_Node]? optional parent class",
        properties: "[AST_ObjectProperty*] array of properties"
    },
    $documentation: "An ES6 class",
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            if (this.name) {
                this.name._walk(visitor);
            }
            if (this.extends) {
                this.extends._walk(visitor);
            }
            this.properties.forEach((prop) => prop._walk(visitor));
        });
    },
    _children_backwards(push) {
        let i = this.properties.length;
        while (i--) push(this.properties[i]);
        if (this.extends) push(this.extends);
        if (this.name) push(this.name);
    },
}, AST_Scope /* TODO a class might have a scope but it's not a scope */);

var AST_ClassProperty = DEFNODE("ClassProperty", "static quote", function AST_ClassProperty(props) {
    if (props) {
        this.static = props.static;
        this.quote = props.quote;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A class property",
    $propdoc: {
        static: "[boolean] whether this is a static key",
        quote: "[string] which quote is being used"
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            if (this.key instanceof AST_Node)
                this.key._walk(visitor);
            if (this.value instanceof AST_Node)
                this.value._walk(visitor);
        });
    },
    _children_backwards(push) {
        if (this.value instanceof AST_Node) push(this.value);
        if (this.key instanceof AST_Node) push(this.key);
    },
    computed_key() {
        return !(this.key instanceof AST_SymbolClassProperty);
    }
}, AST_ObjectProperty);

var AST_ClassPrivateProperty = DEFNODE("ClassPrivateProperty", "", function AST_ClassPrivateProperty(props) {
    if (props) {
        this.static = props.static;
        this.quote = props.quote;
        this.key = props.key;
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A class property for a private property",
}, AST_ClassProperty);

var AST_DefClass = DEFNODE("DefClass", null, function AST_DefClass(props) {
    if (props) {
        this.name = props.name;
        this.extends = props.extends;
        this.properties = props.properties;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A class definition",
}, AST_Class);

var AST_ClassStaticBlock = DEFNODE("ClassStaticBlock", "body block_scope", function AST_ClassStaticBlock (props) {
    this.body = props.body;
    this.block_scope = props.block_scope;
    this.start = props.start;
    this.end = props.end;
}, {
    $documentation: "A block containing statements to be executed in the context of the class",
    $propdoc: {
        body: "[AST_Statement*] an array of statements",
    },
    _walk: function(visitor) {
        return visitor._visit(this, function() {
            walk_body(this, visitor);
        });
    },
    _children_backwards(push) {
        let i = this.body.length;
        while (i--) push(this.body[i]);
    },
    clone: clone_block_scope,
}, AST_Scope);

var AST_ClassExpression = DEFNODE("ClassExpression", null, function AST_ClassExpression(props) {
    if (props) {
        this.name = props.name;
        this.extends = props.extends;
        this.properties = props.properties;
        this.variables = props.variables;
        this.uses_with = props.uses_with;
        this.uses_eval = props.uses_eval;
        this.parent_scope = props.parent_scope;
        this.enclosed = props.enclosed;
        this.cname = props.cname;
        this.body = props.body;
        this.block_scope = props.block_scope;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A class expression."
}, AST_Class);

var AST_Symbol = DEFNODE("Symbol", "scope name thedef", function AST_Symbol(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $propdoc: {
        name: "[string] name of this symbol",
        scope: "[AST_Scope/S] the current scope (not necessarily the definition scope)",
        thedef: "[SymbolDef/S] the definition of this symbol"
    },
    $documentation: "Base class for all symbols"
});

var AST_NewTarget = DEFNODE("NewTarget", null, function AST_NewTarget(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A reference to new.target"
});

var AST_SymbolDeclaration = DEFNODE("SymbolDeclaration", "init", function AST_SymbolDeclaration(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A declaration symbol (symbol in var/const, function name or argument, symbol in catch)",
}, AST_Symbol);

var AST_SymbolVar = DEFNODE("SymbolVar", null, function AST_SymbolVar(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol defining a variable",
}, AST_SymbolDeclaration);

var AST_SymbolBlockDeclaration = DEFNODE(
    "SymbolBlockDeclaration",
    null,
    function AST_SymbolBlockDeclaration(props) {
        if (props) {
            this.init = props.init;
            this.scope = props.scope;
            this.name = props.name;
            this.thedef = props.thedef;
            this.start = props.start;
            this.end = props.end;
        }

        this.flags = 0;
    },
    {
        $documentation: "Base class for block-scoped declaration symbols"
    },
    AST_SymbolDeclaration
);

var AST_SymbolConst = DEFNODE("SymbolConst", null, function AST_SymbolConst(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A constant declaration"
}, AST_SymbolBlockDeclaration);

var AST_SymbolLet = DEFNODE("SymbolLet", null, function AST_SymbolLet(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A block-scoped `let` declaration"
}, AST_SymbolBlockDeclaration);

var AST_SymbolFunarg = DEFNODE("SymbolFunarg", null, function AST_SymbolFunarg(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming a function argument",
}, AST_SymbolVar);

var AST_SymbolDefun = DEFNODE("SymbolDefun", null, function AST_SymbolDefun(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol defining a function",
}, AST_SymbolDeclaration);

var AST_SymbolMethod = DEFNODE("SymbolMethod", null, function AST_SymbolMethod(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol in an object defining a method",
}, AST_Symbol);

var AST_SymbolClassProperty = DEFNODE("SymbolClassProperty", null, function AST_SymbolClassProperty(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol for a class property",
}, AST_Symbol);

var AST_SymbolLambda = DEFNODE("SymbolLambda", null, function AST_SymbolLambda(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming a function expression",
}, AST_SymbolDeclaration);

var AST_SymbolDefClass = DEFNODE("SymbolDefClass", null, function AST_SymbolDefClass(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming a class's name in a class declaration. Lexically scoped to its containing scope, and accessible within the class."
}, AST_SymbolBlockDeclaration);

var AST_SymbolClass = DEFNODE("SymbolClass", null, function AST_SymbolClass(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming a class's name. Lexically scoped to the class."
}, AST_SymbolDeclaration);

var AST_SymbolCatch = DEFNODE("SymbolCatch", null, function AST_SymbolCatch(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming the exception in catch",
}, AST_SymbolBlockDeclaration);

var AST_SymbolImport = DEFNODE("SymbolImport", null, function AST_SymbolImport(props) {
    if (props) {
        this.init = props.init;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol referring to an imported name",
}, AST_SymbolBlockDeclaration);

var AST_SymbolImportForeign = DEFNODE("SymbolImportForeign", null, function AST_SymbolImportForeign(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A symbol imported from a module, but it is defined in the other module, and its real name is irrelevant for this module's purposes",
}, AST_Symbol);

var AST_Label = DEFNODE("Label", "references", function AST_Label(props) {
    if (props) {
        this.references = props.references;
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
        this.initialize();
    }

    this.flags = 0;
}, {
    $documentation: "Symbol naming a label (declaration)",
    $propdoc: {
        references: "[AST_LoopControl*] a list of nodes referring to this label"
    },
    initialize: function() {
        this.references = [];
        this.thedef = this;
    }
}, AST_Symbol);

var AST_SymbolRef = DEFNODE("SymbolRef", null, function AST_SymbolRef(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Reference to some symbol (not definition/declaration)",
}, AST_Symbol);

var AST_SymbolExport = DEFNODE("SymbolExport", null, function AST_SymbolExport(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Symbol referring to a name to export",
}, AST_SymbolRef);

var AST_SymbolExportForeign = DEFNODE("SymbolExportForeign", null, function AST_SymbolExportForeign(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A symbol exported from this module, but it is used in the other module, and its real name is irrelevant for this module's purposes",
}, AST_Symbol);

var AST_LabelRef = DEFNODE("LabelRef", null, function AST_LabelRef(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Reference to a label symbol",
}, AST_Symbol);

var AST_This = DEFNODE("This", null, function AST_This(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `this` symbol",
}, AST_Symbol);

var AST_Super = DEFNODE("Super", null, function AST_Super(props) {
    if (props) {
        this.scope = props.scope;
        this.name = props.name;
        this.thedef = props.thedef;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `super` symbol",
}, AST_This);

var AST_Constant = DEFNODE("Constant", null, function AST_Constant(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for all constants",
    getValue: function() {
        return this.value;
    }
});

var AST_String = DEFNODE("String", "value quote", function AST_String(props) {
    if (props) {
        this.value = props.value;
        this.quote = props.quote;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A string literal",
    $propdoc: {
        value: "[string] the contents of this string",
        quote: "[string] the original quote character"
    }
}, AST_Constant);

var AST_Number = DEFNODE("Number", "value raw", function AST_Number(props) {
    if (props) {
        this.value = props.value;
        this.raw = props.raw;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A number literal",
    $propdoc: {
        value: "[number] the numeric value",
        raw: "[string] numeric value as string"
    }
}, AST_Constant);

var AST_BigInt = DEFNODE("BigInt", "value", function AST_BigInt(props) {
    if (props) {
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A big int literal",
    $propdoc: {
        value: "[string] big int value"
    }
}, AST_Constant);

var AST_RegExp = DEFNODE("RegExp", "value", function AST_RegExp(props) {
    if (props) {
        this.value = props.value;
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A regexp literal",
    $propdoc: {
        value: "[RegExp] the actual regexp",
    }
}, AST_Constant);

var AST_Atom = DEFNODE("Atom", null, function AST_Atom(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for atoms",
}, AST_Constant);

var AST_Null = DEFNODE("Null", null, function AST_Null(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `null` atom",
    value: null
}, AST_Atom);

var AST_NaN = DEFNODE("NaN", null, function AST_NaN(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The impossible value",
    value: 0/0
}, AST_Atom);

var AST_Undefined = DEFNODE("Undefined", null, function AST_Undefined(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `undefined` value",
    value: (function() {}())
}, AST_Atom);

var AST_Hole = DEFNODE("Hole", null, function AST_Hole(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "A hole in an array",
    value: (function() {}())
}, AST_Atom);

var AST_Infinity = DEFNODE("Infinity", null, function AST_Infinity(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `Infinity` value",
    value: 1/0
}, AST_Atom);

var AST_Boolean = DEFNODE("Boolean", null, function AST_Boolean(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "Base class for booleans",
}, AST_Atom);

var AST_False = DEFNODE("False", null, function AST_False(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `false` atom",
    value: false
}, AST_Boolean);

var AST_True = DEFNODE("True", null, function AST_True(props) {
    if (props) {
        this.start = props.start;
        this.end = props.end;
    }

    this.flags = 0;
}, {
    $documentation: "The `true` atom",
    value: true
}, AST_Boolean);

/* -----[ Walk function ]---- */

/**
 * Walk nodes in depth-first search fashion.
 * Callback can return `walk_abort` symbol to stop iteration.
 * It can also return `true` to stop iteration just for child nodes.
 * Iteration can be stopped and continued by passing the `to_visit` argument,
 * which is given to the callback in the second argument.
 **/
function walk(node, cb, to_visit = [node]) {
    const push = to_visit.push.bind(to_visit);
    while (to_visit.length) {
        const node = to_visit.pop();
        const ret = cb(node, to_visit);

        if (ret) {
            if (ret === walk_abort) return true;
            continue;
        }

        node._children_backwards(push);
    }
    return false;
}

/**
 * Walks an AST node and its children.
 *
 * {cb} can return `walk_abort` to interrupt the walk.
 *
 * @param node
 * @param cb {(node, info: { parent: (nth) => any }) => (boolean | undefined)}
 *
 * @returns {boolean} whether the walk was aborted
 *
 * @example
 * const found_some_cond = walk_parent(my_ast_node, (node, { parent }) => {
 *   if (some_cond(node, parent())) return walk_abort
 * });
 */
function walk_parent(node, cb, initial_stack) {
    const to_visit = [node];
    const push = to_visit.push.bind(to_visit);
    const stack = initial_stack ? initial_stack.slice() : [];
    const parent_pop_indices = [];

    let current;

    const info = {
        parent: (n = 0) => {
            if (n === -1) {
                return current;
            }

            // [ p1 p0 ] [ 1 0 ]
            if (initial_stack && n >= stack.length) {
                n -= stack.length;
                return initial_stack[
                    initial_stack.length - (n + 1)
                ];
            }

            return stack[stack.length - (1 + n)];
        },
    };

    while (to_visit.length) {
        current = to_visit.pop();

        while (
            parent_pop_indices.length &&
            to_visit.length == parent_pop_indices[parent_pop_indices.length - 1]
        ) {
            stack.pop();
            parent_pop_indices.pop();
        }

        const ret = cb(current, info);

        if (ret) {
            if (ret === walk_abort) return true;
            continue;
        }

        const visit_length = to_visit.length;

        current._children_backwards(push);

        // Push only if we're going to traverse the children
        if (to_visit.length > visit_length) {
            stack.push(current);
            parent_pop_indices.push(visit_length - 1);
        }
    }

    return false;
}

const walk_abort = Symbol("abort walk");

/* -----[ TreeWalker ]----- */

class TreeWalker {
    constructor(callback) {
        this.visit = callback;
        this.stack = [];
        this.directives = Object.create(null);
    }

    _visit(node, descend) {
        this.push(node);
        var ret = this.visit(node, descend ? function() {
            descend.call(node);
        } : noop);
        if (!ret && descend) {
            descend.call(node);
        }
        this.pop();
        return ret;
    }

    parent(n) {
        return this.stack[this.stack.length - 2 - (n || 0)];
    }

    push(node) {
        if (node instanceof AST_Lambda) {
            this.directives = Object.create(this.directives);
        } else if (node instanceof AST_Directive && !this.directives[node.value]) {
            this.directives[node.value] = node;
        } else if (node instanceof AST_Class) {
            this.directives = Object.create(this.directives);
            if (!this.directives["use strict"]) {
                this.directives["use strict"] = node;
            }
        }
        this.stack.push(node);
    }

    pop() {
        var node = this.stack.pop();
        if (node instanceof AST_Lambda || node instanceof AST_Class) {
            this.directives = Object.getPrototypeOf(this.directives);
        }
    }

    self() {
        return this.stack[this.stack.length - 1];
    }

    find_parent(type) {
        var stack = this.stack;
        for (var i = stack.length; --i >= 0;) {
            var x = stack[i];
            if (x instanceof type) return x;
        }
    }

    find_scope() {
        for (let i = 0;;i++) {
            const p = this.parent(i);
            if (p instanceof AST_Toplevel) return p;
            if (p instanceof AST_Lambda) return p;
            if (p.block_scope) return p.block_scope;
        }
    }

    has_directive(type) {
        var dir = this.directives[type];
        if (dir) return dir;
        var node = this.stack[this.stack.length - 1];
        if (node instanceof AST_Scope && node.body) {
            for (var i = 0; i < node.body.length; ++i) {
                var st = node.body[i];
                if (!(st instanceof AST_Directive)) break;
                if (st.value == type) return st;
            }
        }
    }

    loopcontrol_target(node) {
        var stack = this.stack;
        if (node.label) for (var i = stack.length; --i >= 0;) {
            var x = stack[i];
            if (x instanceof AST_LabeledStatement && x.label.name == node.label.name)
                return x.body;
        } else for (var i = stack.length; --i >= 0;) {
            var x = stack[i];
            if (x instanceof AST_IterationStatement
                || node instanceof AST_Break && x instanceof AST_Switch)
                return x;
        }
    }
}

// Tree transformer helpers.
class TreeTransformer extends TreeWalker {
    constructor(before, after) {
        super();
        this.before = before;
        this.after = after;
    }
}

const _PURE     = 0b00000001;
const _INLINE   = 0b00000010;
const _NOINLINE = 0b00000100;

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

function def_transform(node, descend) {
    node.DEFMETHOD("transform", function(tw, in_list) {
        let transformed = undefined;
        tw.push(this);
        if (tw.before) transformed = tw.before(this, descend, in_list);
        if (transformed === undefined) {
            transformed = this;
            descend(transformed, tw);
            if (tw.after) {
                const after_ret = tw.after(transformed, in_list);
                if (after_ret !== undefined) transformed = after_ret;
            }
        }
        tw.pop();
        return transformed;
    });
}

function do_list(list, tw) {
    return MAP(list, function(node) {
        return node.transform(tw, true);
    });
}

def_transform(AST_Node, noop);

def_transform(AST_LabeledStatement, function(self, tw) {
    self.label = self.label.transform(tw);
    self.body = self.body.transform(tw);
});

def_transform(AST_SimpleStatement, function(self, tw) {
    self.body = self.body.transform(tw);
});

def_transform(AST_Block, function(self, tw) {
    self.body = do_list(self.body, tw);
});

def_transform(AST_Do, function(self, tw) {
    self.body = self.body.transform(tw);
    self.condition = self.condition.transform(tw);
});

def_transform(AST_While, function(self, tw) {
    self.condition = self.condition.transform(tw);
    self.body = self.body.transform(tw);
});

def_transform(AST_For, function(self, tw) {
    if (self.init) self.init = self.init.transform(tw);
    if (self.condition) self.condition = self.condition.transform(tw);
    if (self.step) self.step = self.step.transform(tw);
    self.body = self.body.transform(tw);
});

def_transform(AST_ForIn, function(self, tw) {
    self.init = self.init.transform(tw);
    self.object = self.object.transform(tw);
    self.body = self.body.transform(tw);
});

def_transform(AST_With, function(self, tw) {
    self.expression = self.expression.transform(tw);
    self.body = self.body.transform(tw);
});

def_transform(AST_Exit, function(self, tw) {
    if (self.value) self.value = self.value.transform(tw);
});

def_transform(AST_LoopControl, function(self, tw) {
    if (self.label) self.label = self.label.transform(tw);
});

def_transform(AST_If, function(self, tw) {
    self.condition = self.condition.transform(tw);
    self.body = self.body.transform(tw);
    if (self.alternative) self.alternative = self.alternative.transform(tw);
});

def_transform(AST_Switch, function(self, tw) {
    self.expression = self.expression.transform(tw);
    self.body = do_list(self.body, tw);
});

def_transform(AST_Case, function(self, tw) {
    self.expression = self.expression.transform(tw);
    self.body = do_list(self.body, tw);
});

def_transform(AST_Try, function(self, tw) {
    self.body = do_list(self.body, tw);
    if (self.bcatch) self.bcatch = self.bcatch.transform(tw);
    if (self.bfinally) self.bfinally = self.bfinally.transform(tw);
});

def_transform(AST_Catch, function(self, tw) {
    if (self.argname) self.argname = self.argname.transform(tw);
    self.body = do_list(self.body, tw);
});

def_transform(AST_Definitions, function(self, tw) {
    self.definitions = do_list(self.definitions, tw);
});

def_transform(AST_VarDef, function(self, tw) {
    self.name = self.name.transform(tw);
    if (self.value) self.value = self.value.transform(tw);
});

def_transform(AST_Destructuring, function(self, tw) {
    self.names = do_list(self.names, tw);
});

def_transform(AST_Lambda, function(self, tw) {
    if (self.name) self.name = self.name.transform(tw);
    self.argnames = do_list(self.argnames, tw);
    if (self.body instanceof AST_Node) {
        self.body = self.body.transform(tw);
    } else {
        self.body = do_list(self.body, tw);
    }
});

def_transform(AST_Call, function(self, tw) {
    self.expression = self.expression.transform(tw);
    self.args = do_list(self.args, tw);
});

def_transform(AST_Sequence, function(self, tw) {
    const result = do_list(self.expressions, tw);
    self.expressions = result.length
        ? result
        : [new AST_Number({ value: 0 })];
});

def_transform(AST_PropAccess, function(self, tw) {
    self.expression = self.expression.transform(tw);
});

def_transform(AST_Sub, function(self, tw) {
    self.expression = self.expression.transform(tw);
    self.property = self.property.transform(tw);
});

def_transform(AST_Chain, function(self, tw) {
    self.expression = self.expression.transform(tw);
});

def_transform(AST_Yield, function(self, tw) {
    if (self.expression) self.expression = self.expression.transform(tw);
});

def_transform(AST_Await, function(self, tw) {
    self.expression = self.expression.transform(tw);
});

def_transform(AST_Unary, function(self, tw) {
    self.expression = self.expression.transform(tw);
});

def_transform(AST_Binary, function(self, tw) {
    self.left = self.left.transform(tw);
    self.right = self.right.transform(tw);
});

def_transform(AST_Conditional, function(self, tw) {
    self.condition = self.condition.transform(tw);
    self.consequent = self.consequent.transform(tw);
    self.alternative = self.alternative.transform(tw);
});

def_transform(AST_Array, function(self, tw) {
    self.elements = do_list(self.elements, tw);
});

def_transform(AST_Object, function(self, tw) {
    self.properties = do_list(self.properties, tw);
});

def_transform(AST_ObjectProperty, function(self, tw) {
    if (self.key instanceof AST_Node) {
        self.key = self.key.transform(tw);
    }
    if (self.value) self.value = self.value.transform(tw);
});

def_transform(AST_Class, function(self, tw) {
    if (self.name) self.name = self.name.transform(tw);
    if (self.extends) self.extends = self.extends.transform(tw);
    self.properties = do_list(self.properties, tw);
});

def_transform(AST_ClassStaticBlock, function(self, tw) {
    self.body = do_list(self.body, tw);
});

def_transform(AST_Expansion, function(self, tw) {
    self.expression = self.expression.transform(tw);
});

def_transform(AST_NameMapping, function(self, tw) {
    self.foreign_name = self.foreign_name.transform(tw);
    self.name = self.name.transform(tw);
});

def_transform(AST_Import, function(self, tw) {
    if (self.imported_name) self.imported_name = self.imported_name.transform(tw);
    if (self.imported_names) do_list(self.imported_names, tw);
    self.module_name = self.module_name.transform(tw);
});

def_transform(AST_Export, function(self, tw) {
    if (self.exported_definition) self.exported_definition = self.exported_definition.transform(tw);
    if (self.exported_value) self.exported_value = self.exported_value.transform(tw);
    if (self.exported_names) do_list(self.exported_names, tw);
    if (self.module_name) self.module_name = self.module_name.transform(tw);
});

def_transform(AST_TemplateString, function(self, tw) {
    self.segments = do_list(self.segments, tw);
});

def_transform(AST_PrefixedTemplateString, function(self, tw) {
    self.prefix = self.prefix.transform(tw);
    self.template_string = self.template_string.transform(tw);
});

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

(function() {

    var normalize_directives = function(body) {
        var in_directive = true;

        for (var i = 0; i < body.length; i++) {
            if (in_directive && body[i] instanceof AST_Statement && body[i].body instanceof AST_String) {
                body[i] = new AST_Directive({
                    start: body[i].start,
                    end: body[i].end,
                    value: body[i].body.value
                });
            } else if (in_directive && !(body[i] instanceof AST_Statement && body[i].body instanceof AST_String)) {
                in_directive = false;
            }
        }

        return body;
    };

    const assert_clause_from_moz = (assertions) => {
        if (assertions && assertions.length > 0) {
            return new AST_Object({
                start: my_start_token(assertions),
                end: my_end_token(assertions),
                properties: assertions.map((assertion_kv) =>
                    new AST_ObjectKeyVal({
                        start: my_start_token(assertion_kv),
                        end: my_end_token(assertion_kv),
                        key: assertion_kv.key.name || assertion_kv.key.value,
                        value: from_moz(assertion_kv.value)
                    })
                )
            });
        }
        return null;
    };

    var MOZ_TO_ME = {
        Program: function(M) {
            return new AST_Toplevel({
                start: my_start_token(M),
                end: my_end_token(M),
                body: normalize_directives(M.body.map(from_moz))
            });
        },

        ArrayPattern: function(M) {
            return new AST_Destructuring({
                start: my_start_token(M),
                end: my_end_token(M),
                names: M.elements.map(function(elm) {
                    if (elm === null) {
                        return new AST_Hole();
                    }
                    return from_moz(elm);
                }),
                is_array: true
            });
        },

        ObjectPattern: function(M) {
            return new AST_Destructuring({
                start: my_start_token(M),
                end: my_end_token(M),
                names: M.properties.map(from_moz),
                is_array: false
            });
        },

        AssignmentPattern: function(M) {
            return new AST_DefaultAssign({
                start: my_start_token(M),
                end: my_end_token(M),
                left: from_moz(M.left),
                operator: "=",
                right: from_moz(M.right)
            });
        },

        SpreadElement: function(M) {
            return new AST_Expansion({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.argument)
            });
        },

        RestElement: function(M) {
            return new AST_Expansion({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.argument)
            });
        },

        TemplateElement: function(M) {
            return new AST_TemplateSegment({
                start: my_start_token(M),
                end: my_end_token(M),
                value: M.value.cooked,
                raw: M.value.raw
            });
        },

        TemplateLiteral: function(M) {
            var segments = [];
            for (var i = 0; i < M.quasis.length; i++) {
                segments.push(from_moz(M.quasis[i]));
                if (M.expressions[i]) {
                    segments.push(from_moz(M.expressions[i]));
                }
            }
            return new AST_TemplateString({
                start: my_start_token(M),
                end: my_end_token(M),
                segments: segments
            });
        },

        TaggedTemplateExpression: function(M) {
            return new AST_PrefixedTemplateString({
                start: my_start_token(M),
                end: my_end_token(M),
                template_string: from_moz(M.quasi),
                prefix: from_moz(M.tag)
            });
        },

        FunctionDeclaration: function(M) {
            return new AST_Defun({
                start: my_start_token(M),
                end: my_end_token(M),
                name: from_moz(M.id),
                argnames: M.params.map(from_moz),
                is_generator: M.generator,
                async: M.async,
                body: normalize_directives(from_moz(M.body).body)
            });
        },

        FunctionExpression: function(M) {
            return new AST_Function({
                start: my_start_token(M),
                end: my_end_token(M),
                name: from_moz(M.id),
                argnames: M.params.map(from_moz),
                is_generator: M.generator,
                async: M.async,
                body: normalize_directives(from_moz(M.body).body)
            });
        },

        ArrowFunctionExpression: function(M) {
            const body = M.body.type === "BlockStatement"
                ? from_moz(M.body).body
                : [make_node(AST_Return, {}, { value: from_moz(M.body) })];
            return new AST_Arrow({
                start: my_start_token(M),
                end: my_end_token(M),
                argnames: M.params.map(from_moz),
                body,
                async: M.async,
            });
        },

        ExpressionStatement: function(M) {
            return new AST_SimpleStatement({
                start: my_start_token(M),
                end: my_end_token(M),
                body: from_moz(M.expression)
            });
        },

        TryStatement: function(M) {
            var handlers = M.handlers || [M.handler];
            if (handlers.length > 1 || M.guardedHandlers && M.guardedHandlers.length) {
                throw new Error("Multiple catch clauses are not supported.");
            }
            return new AST_Try({
                start    : my_start_token(M),
                end      : my_end_token(M),
                body     : from_moz(M.block).body,
                bcatch   : from_moz(handlers[0]),
                bfinally : M.finalizer ? new AST_Finally(from_moz(M.finalizer)) : null
            });
        },

        Property: function(M) {
            var key = M.key;
            var args = {
                start    : my_start_token(key || M.value),
                end      : my_end_token(M.value),
                key      : key.type == "Identifier" ? key.name : key.value,
                value    : from_moz(M.value)
            };
            if (M.computed) {
                args.key = from_moz(M.key);
            }
            if (M.method) {
                args.is_generator = M.value.generator;
                args.async = M.value.async;
                if (!M.computed) {
                    args.key = new AST_SymbolMethod({ name: args.key });
                } else {
                    args.key = from_moz(M.key);
                }
                return new AST_ConciseMethod(args);
            }
            if (M.kind == "init") {
                if (key.type != "Identifier" && key.type != "Literal") {
                    args.key = from_moz(key);
                }
                return new AST_ObjectKeyVal(args);
            }
            if (typeof args.key === "string" || typeof args.key === "number") {
                args.key = new AST_SymbolMethod({
                    name: args.key
                });
            }
            args.value = new AST_Accessor(args.value);
            if (M.kind == "get") return new AST_ObjectGetter(args);
            if (M.kind == "set") return new AST_ObjectSetter(args);
            if (M.kind == "method") {
                args.async = M.value.async;
                args.is_generator = M.value.generator;
                args.quote = M.computed ? "\"" : null;
                return new AST_ConciseMethod(args);
            }
        },

        MethodDefinition: function(M) {
            var args = {
                start    : my_start_token(M),
                end      : my_end_token(M),
                key      : M.computed ? from_moz(M.key) : new AST_SymbolMethod({ name: M.key.name || M.key.value }),
                value    : from_moz(M.value),
                static   : M.static,
            };
            if (M.kind == "get") {
                return new AST_ObjectGetter(args);
            }
            if (M.kind == "set") {
                return new AST_ObjectSetter(args);
            }
            args.is_generator = M.value.generator;
            args.async = M.value.async;
            return new AST_ConciseMethod(args);
        },

        FieldDefinition: function(M) {
            let key;
            if (M.computed) {
                key = from_moz(M.key);
            } else {
                if (M.key.type !== "Identifier") throw new Error("Non-Identifier key in FieldDefinition");
                key = from_moz(M.key);
            }
            return new AST_ClassProperty({
                start    : my_start_token(M),
                end      : my_end_token(M),
                key,
                value    : from_moz(M.value),
                static   : M.static,
            });
        },

        PropertyDefinition: function(M) {
            let key;
            if (M.computed) {
                key = from_moz(M.key);
            } else {
                if (M.key.type !== "Identifier") throw new Error("Non-Identifier key in PropertyDefinition");
                key = from_moz(M.key);
            }

            return new AST_ClassProperty({
                start    : my_start_token(M),
                end      : my_end_token(M),
                key,
                value    : from_moz(M.value),
                static   : M.static,
            });
        },

        StaticBlock: function(M) {
            return new AST_ClassStaticBlock({
                start : my_start_token(M),
                end   : my_end_token(M),
                body  : M.body.map(from_moz),
            });
        },

        ArrayExpression: function(M) {
            return new AST_Array({
                start    : my_start_token(M),
                end      : my_end_token(M),
                elements : M.elements.map(function(elem) {
                    return elem === null ? new AST_Hole() : from_moz(elem);
                })
            });
        },

        ObjectExpression: function(M) {
            return new AST_Object({
                start      : my_start_token(M),
                end        : my_end_token(M),
                properties : M.properties.map(function(prop) {
                    if (prop.type === "SpreadElement") {
                        return from_moz(prop);
                    }
                    prop.type = "Property";
                    return from_moz(prop);
                })
            });
        },

        SequenceExpression: function(M) {
            return new AST_Sequence({
                start      : my_start_token(M),
                end        : my_end_token(M),
                expressions: M.expressions.map(from_moz)
            });
        },

        MemberExpression: function(M) {
            return new (M.computed ? AST_Sub : AST_Dot)({
                start      : my_start_token(M),
                end        : my_end_token(M),
                property   : M.computed ? from_moz(M.property) : M.property.name,
                expression : from_moz(M.object),
                optional   : M.optional || false
            });
        },

        ChainExpression: function(M) {
            return new AST_Chain({
                start      : my_start_token(M),
                end        : my_end_token(M),
                expression : from_moz(M.expression)
            });
        },

        SwitchCase: function(M) {
            return new (M.test ? AST_Case : AST_Default)({
                start      : my_start_token(M),
                end        : my_end_token(M),
                expression : from_moz(M.test),
                body       : M.consequent.map(from_moz)
            });
        },

        VariableDeclaration: function(M) {
            return new (M.kind === "const" ? AST_Const :
                        M.kind === "let" ? AST_Let : AST_Var)({
                start       : my_start_token(M),
                end         : my_end_token(M),
                definitions : M.declarations.map(from_moz)
            });
        },

        ImportDeclaration: function(M) {
            var imported_name = null;
            var imported_names = null;
            M.specifiers.forEach(function (specifier) {
                if (specifier.type === "ImportSpecifier") {
                    if (!imported_names) { imported_names = []; }
                    imported_names.push(new AST_NameMapping({
                        start: my_start_token(specifier),
                        end: my_end_token(specifier),
                        foreign_name: from_moz(specifier.imported),
                        name: from_moz(specifier.local)
                    }));
                } else if (specifier.type === "ImportDefaultSpecifier") {
                    imported_name = from_moz(specifier.local);
                } else if (specifier.type === "ImportNamespaceSpecifier") {
                    if (!imported_names) { imported_names = []; }
                    imported_names.push(new AST_NameMapping({
                        start: my_start_token(specifier),
                        end: my_end_token(specifier),
                        foreign_name: new AST_SymbolImportForeign({ name: "*" }),
                        name: from_moz(specifier.local)
                    }));
                }
            });
            return new AST_Import({
                start       : my_start_token(M),
                end         : my_end_token(M),
                imported_name: imported_name,
                imported_names : imported_names,
                module_name : from_moz(M.source),
                assert_clause: assert_clause_from_moz(M.assertions)
            });
        },

        ExportAllDeclaration: function(M) {
            return new AST_Export({
                start: my_start_token(M),
                end: my_end_token(M),
                exported_names: [
                    new AST_NameMapping({
                        name: new AST_SymbolExportForeign({ name: "*" }),
                        foreign_name: new AST_SymbolExportForeign({ name: "*" })
                    })
                ],
                module_name: from_moz(M.source),
                assert_clause: assert_clause_from_moz(M.assertions)
            });
        },

        ExportNamedDeclaration: function(M) {
            return new AST_Export({
                start: my_start_token(M),
                end: my_end_token(M),
                exported_definition: from_moz(M.declaration),
                exported_names: M.specifiers && M.specifiers.length ? M.specifiers.map(function (specifier) {
                    return new AST_NameMapping({
                        foreign_name: from_moz(specifier.exported),
                        name: from_moz(specifier.local)
                    });
                }) : null,
                module_name: from_moz(M.source),
                assert_clause: assert_clause_from_moz(M.assertions)
            });
        },

        ExportDefaultDeclaration: function(M) {
            return new AST_Export({
                start: my_start_token(M),
                end: my_end_token(M),
                exported_value: from_moz(M.declaration),
                is_default: true
            });
        },

        Literal: function(M) {
            var val = M.value, args = {
                start  : my_start_token(M),
                end    : my_end_token(M)
            };
            var rx = M.regex;
            if (rx && rx.pattern) {
                // RegExpLiteral as per ESTree AST spec
                args.value = {
                    source: rx.pattern,
                    flags: rx.flags
                };
                return new AST_RegExp(args);
            } else if (rx) {
                // support legacy RegExp
                const rx_source = M.raw || val;
                const match = rx_source.match(/^\/(.*)\/(\w*)$/);
                if (!match) throw new Error("Invalid regex source " + rx_source);
                const [_, source, flags] = match;
                args.value = { source, flags };
                return new AST_RegExp(args);
            }
            if (val === null) return new AST_Null(args);
            switch (typeof val) {
              case "string":
                args.value = val;
                return new AST_String(args);
              case "number":
                args.value = val;
                args.raw = M.raw || val.toString();
                return new AST_Number(args);
              case "boolean":
                return new (val ? AST_True : AST_False)(args);
            }
        },

        MetaProperty: function(M) {
            if (M.meta.name === "new" && M.property.name === "target") {
                return new AST_NewTarget({
                    start: my_start_token(M),
                    end: my_end_token(M)
                });
            } else if (M.meta.name === "import" && M.property.name === "meta") {
                return new AST_ImportMeta({
                    start: my_start_token(M),
                    end: my_end_token(M)
                });
            }
        },

        Identifier: function(M) {
            var p = FROM_MOZ_STACK[FROM_MOZ_STACK.length - 2];
            return new (  p.type == "LabeledStatement" ? AST_Label
                        : p.type == "VariableDeclarator" && p.id === M ? (p.kind == "const" ? AST_SymbolConst : p.kind == "let" ? AST_SymbolLet : AST_SymbolVar)
                        : /Import.*Specifier/.test(p.type) ? (p.local === M ? AST_SymbolImport : AST_SymbolImportForeign)
                        : p.type == "ExportSpecifier" ? (p.local === M ? AST_SymbolExport : AST_SymbolExportForeign)
                        : p.type == "FunctionExpression" ? (p.id === M ? AST_SymbolLambda : AST_SymbolFunarg)
                        : p.type == "FunctionDeclaration" ? (p.id === M ? AST_SymbolDefun : AST_SymbolFunarg)
                        : p.type == "ArrowFunctionExpression" ? (p.params.includes(M)) ? AST_SymbolFunarg : AST_SymbolRef
                        : p.type == "ClassExpression" ? (p.id === M ? AST_SymbolClass : AST_SymbolRef)
                        : p.type == "Property" ? (p.key === M && p.computed || p.value === M ? AST_SymbolRef : AST_SymbolMethod)
                        : p.type == "PropertyDefinition" || p.type === "FieldDefinition" ? (p.key === M && p.computed || p.value === M ? AST_SymbolRef : AST_SymbolClassProperty)
                        : p.type == "ClassDeclaration" ? (p.id === M ? AST_SymbolDefClass : AST_SymbolRef)
                        : p.type == "MethodDefinition" ? (p.computed ? AST_SymbolRef : AST_SymbolMethod)
                        : p.type == "CatchClause" ? AST_SymbolCatch
                        : p.type == "BreakStatement" || p.type == "ContinueStatement" ? AST_LabelRef
                        : AST_SymbolRef)({
                            start : my_start_token(M),
                            end   : my_end_token(M),
                            name  : M.name
                        });
        },

        BigIntLiteral(M) {
            return new AST_BigInt({
                start : my_start_token(M),
                end   : my_end_token(M),
                value : M.value
            });
        },

        EmptyStatement: function(M) {
            return new AST_EmptyStatement({
                start: my_start_token(M),
                end: my_end_token(M)
            });
        },

        BlockStatement: function(M) {
            return new AST_BlockStatement({
                start: my_start_token(M),
                end: my_end_token(M),
                body: M.body.map(from_moz)
            });
        },

        IfStatement: function(M) {
            return new AST_If({
                start: my_start_token(M),
                end: my_end_token(M),
                condition: from_moz(M.test),
                body: from_moz(M.consequent),
                alternative: from_moz(M.alternate)
            });
        },

        LabeledStatement: function(M) {
            return new AST_LabeledStatement({
                start: my_start_token(M),
                end: my_end_token(M),
                label: from_moz(M.label),
                body: from_moz(M.body)
            });
        },

        BreakStatement: function(M) {
            return new AST_Break({
                start: my_start_token(M),
                end: my_end_token(M),
                label: from_moz(M.label)
            });
        },

        ContinueStatement: function(M) {
            return new AST_Continue({
                start: my_start_token(M),
                end: my_end_token(M),
                label: from_moz(M.label)
            });
        },

        WithStatement: function(M) {
            return new AST_With({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.object),
                body: from_moz(M.body)
            });
        },

        SwitchStatement: function(M) {
            return new AST_Switch({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.discriminant),
                body: M.cases.map(from_moz)
            });
        },

        ReturnStatement: function(M) {
            return new AST_Return({
                start: my_start_token(M),
                end: my_end_token(M),
                value: from_moz(M.argument)
            });
        },

        ThrowStatement: function(M) {
            return new AST_Throw({
                start: my_start_token(M),
                end: my_end_token(M),
                value: from_moz(M.argument)
            });
        },

        WhileStatement: function(M) {
            return new AST_While({
                start: my_start_token(M),
                end: my_end_token(M),
                condition: from_moz(M.test),
                body: from_moz(M.body)
            });
        },

        DoWhileStatement: function(M) {
            return new AST_Do({
                start: my_start_token(M),
                end: my_end_token(M),
                condition: from_moz(M.test),
                body: from_moz(M.body)
            });
        },

        ForStatement: function(M) {
            return new AST_For({
                start: my_start_token(M),
                end: my_end_token(M),
                init: from_moz(M.init),
                condition: from_moz(M.test),
                step: from_moz(M.update),
                body: from_moz(M.body)
            });
        },

        ForInStatement: function(M) {
            return new AST_ForIn({
                start: my_start_token(M),
                end: my_end_token(M),
                init: from_moz(M.left),
                object: from_moz(M.right),
                body: from_moz(M.body)
            });
        },

        ForOfStatement: function(M) {
            return new AST_ForOf({
                start: my_start_token(M),
                end: my_end_token(M),
                init: from_moz(M.left),
                object: from_moz(M.right),
                body: from_moz(M.body),
                await: M.await
            });
        },

        AwaitExpression: function(M) {
            return new AST_Await({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.argument)
            });
        },

        YieldExpression: function(M) {
            return new AST_Yield({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.argument),
                is_star: M.delegate
            });
        },

        DebuggerStatement: function(M) {
            return new AST_Debugger({
                start: my_start_token(M),
                end: my_end_token(M)
            });
        },

        VariableDeclarator: function(M) {
            return new AST_VarDef({
                start: my_start_token(M),
                end: my_end_token(M),
                name: from_moz(M.id),
                value: from_moz(M.init)
            });
        },

        CatchClause: function(M) {
            return new AST_Catch({
                start: my_start_token(M),
                end: my_end_token(M),
                argname: from_moz(M.param),
                body: from_moz(M.body).body
            });
        },

        ThisExpression: function(M) {
            return new AST_This({
                start: my_start_token(M),
                end: my_end_token(M)
            });
        },

        Super: function(M) {
            return new AST_Super({
                start: my_start_token(M),
                end: my_end_token(M)
            });
        },

        BinaryExpression: function(M) {
            return new AST_Binary({
                start: my_start_token(M),
                end: my_end_token(M),
                operator: M.operator,
                left: from_moz(M.left),
                right: from_moz(M.right)
            });
        },

        LogicalExpression: function(M) {
            return new AST_Binary({
                start: my_start_token(M),
                end: my_end_token(M),
                operator: M.operator,
                left: from_moz(M.left),
                right: from_moz(M.right)
            });
        },

        AssignmentExpression: function(M) {
            return new AST_Assign({
                start: my_start_token(M),
                end: my_end_token(M),
                operator: M.operator,
                left: from_moz(M.left),
                right: from_moz(M.right)
            });
        },

        ConditionalExpression: function(M) {
            return new AST_Conditional({
                start: my_start_token(M),
                end: my_end_token(M),
                condition: from_moz(M.test),
                consequent: from_moz(M.consequent),
                alternative: from_moz(M.alternate)
            });
        },

        NewExpression: function(M) {
            return new AST_New({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.callee),
                args: M.arguments.map(from_moz)
            });
        },

        CallExpression: function(M) {
            return new AST_Call({
                start: my_start_token(M),
                end: my_end_token(M),
                expression: from_moz(M.callee),
                optional: M.optional,
                args: M.arguments.map(from_moz)
            });
        }
    };

    MOZ_TO_ME.UpdateExpression =
    MOZ_TO_ME.UnaryExpression = function To_Moz_Unary(M) {
        var prefix = "prefix" in M ? M.prefix
            : M.type == "UnaryExpression" ? true : false;
        return new (prefix ? AST_UnaryPrefix : AST_UnaryPostfix)({
            start      : my_start_token(M),
            end        : my_end_token(M),
            operator   : M.operator,
            expression : from_moz(M.argument)
        });
    };

    MOZ_TO_ME.ClassDeclaration =
    MOZ_TO_ME.ClassExpression = function From_Moz_Class(M) {
        return new (M.type === "ClassDeclaration" ? AST_DefClass : AST_ClassExpression)({
            start    : my_start_token(M),
            end      : my_end_token(M),
            name     : from_moz(M.id),
            extends  : from_moz(M.superClass),
            properties: M.body.body.map(from_moz)
        });
    };

    def_to_moz(AST_EmptyStatement, function To_Moz_EmptyStatement() {
        return {
            type: "EmptyStatement"
        };
    });
    def_to_moz(AST_BlockStatement, function To_Moz_BlockStatement(M) {
        return {
            type: "BlockStatement",
            body: M.body.map(to_moz)
        };
    });
    def_to_moz(AST_If, function To_Moz_IfStatement(M) {
        return {
            type: "IfStatement",
            test: to_moz(M.condition),
            consequent: to_moz(M.body),
            alternate: to_moz(M.alternative)
        };
    });
    def_to_moz(AST_LabeledStatement, function To_Moz_LabeledStatement(M) {
        return {
            type: "LabeledStatement",
            label: to_moz(M.label),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_Break, function To_Moz_BreakStatement(M) {
        return {
            type: "BreakStatement",
            label: to_moz(M.label)
        };
    });
    def_to_moz(AST_Continue, function To_Moz_ContinueStatement(M) {
        return {
            type: "ContinueStatement",
            label: to_moz(M.label)
        };
    });
    def_to_moz(AST_With, function To_Moz_WithStatement(M) {
        return {
            type: "WithStatement",
            object: to_moz(M.expression),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_Switch, function To_Moz_SwitchStatement(M) {
        return {
            type: "SwitchStatement",
            discriminant: to_moz(M.expression),
            cases: M.body.map(to_moz)
        };
    });
    def_to_moz(AST_Return, function To_Moz_ReturnStatement(M) {
        return {
            type: "ReturnStatement",
            argument: to_moz(M.value)
        };
    });
    def_to_moz(AST_Throw, function To_Moz_ThrowStatement(M) {
        return {
            type: "ThrowStatement",
            argument: to_moz(M.value)
        };
    });
    def_to_moz(AST_While, function To_Moz_WhileStatement(M) {
        return {
            type: "WhileStatement",
            test: to_moz(M.condition),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_Do, function To_Moz_DoWhileStatement(M) {
        return {
            type: "DoWhileStatement",
            test: to_moz(M.condition),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_For, function To_Moz_ForStatement(M) {
        return {
            type: "ForStatement",
            init: to_moz(M.init),
            test: to_moz(M.condition),
            update: to_moz(M.step),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_ForIn, function To_Moz_ForInStatement(M) {
        return {
            type: "ForInStatement",
            left: to_moz(M.init),
            right: to_moz(M.object),
            body: to_moz(M.body)
        };
    });
    def_to_moz(AST_ForOf, function To_Moz_ForOfStatement(M) {
        return {
            type: "ForOfStatement",
            left: to_moz(M.init),
            right: to_moz(M.object),
            body: to_moz(M.body),
            await: M.await
        };
    });
    def_to_moz(AST_Await, function To_Moz_AwaitExpression(M) {
        return {
            type: "AwaitExpression",
            argument: to_moz(M.expression)
        };
    });
    def_to_moz(AST_Yield, function To_Moz_YieldExpression(M) {
        return {
            type: "YieldExpression",
            argument: to_moz(M.expression),
            delegate: M.is_star
        };
    });
    def_to_moz(AST_Debugger, function To_Moz_DebuggerStatement() {
        return {
            type: "DebuggerStatement"
        };
    });
    def_to_moz(AST_VarDef, function To_Moz_VariableDeclarator(M) {
        return {
            type: "VariableDeclarator",
            id: to_moz(M.name),
            init: to_moz(M.value)
        };
    });
    def_to_moz(AST_Catch, function To_Moz_CatchClause(M) {
        return {
            type: "CatchClause",
            param: to_moz(M.argname),
            body: to_moz_block(M)
        };
    });

    def_to_moz(AST_This, function To_Moz_ThisExpression() {
        return {
            type: "ThisExpression"
        };
    });
    def_to_moz(AST_Super, function To_Moz_Super() {
        return {
            type: "Super"
        };
    });
    def_to_moz(AST_Binary, function To_Moz_BinaryExpression(M) {
        return {
            type: "BinaryExpression",
            operator: M.operator,
            left: to_moz(M.left),
            right: to_moz(M.right)
        };
    });
    def_to_moz(AST_Binary, function To_Moz_LogicalExpression(M) {
        return {
            type: "LogicalExpression",
            operator: M.operator,
            left: to_moz(M.left),
            right: to_moz(M.right)
        };
    });
    def_to_moz(AST_Assign, function To_Moz_AssignmentExpression(M) {
        return {
            type: "AssignmentExpression",
            operator: M.operator,
            left: to_moz(M.left),
            right: to_moz(M.right)
        };
    });
    def_to_moz(AST_Conditional, function To_Moz_ConditionalExpression(M) {
        return {
            type: "ConditionalExpression",
            test: to_moz(M.condition),
            consequent: to_moz(M.consequent),
            alternate: to_moz(M.alternative)
        };
    });
    def_to_moz(AST_New, function To_Moz_NewExpression(M) {
        return {
            type: "NewExpression",
            callee: to_moz(M.expression),
            arguments: M.args.map(to_moz)
        };
    });
    def_to_moz(AST_Call, function To_Moz_CallExpression(M) {
        return {
            type: "CallExpression",
            callee: to_moz(M.expression),
            optional: M.optional,
            arguments: M.args.map(to_moz)
        };
    });

    def_to_moz(AST_Toplevel, function To_Moz_Program(M) {
        return to_moz_scope("Program", M);
    });

    def_to_moz(AST_Expansion, function To_Moz_Spread(M) {
        return {
            type: to_moz_in_destructuring() ? "RestElement" : "SpreadElement",
            argument: to_moz(M.expression)
        };
    });

    def_to_moz(AST_PrefixedTemplateString, function To_Moz_TaggedTemplateExpression(M) {
        return {
            type: "TaggedTemplateExpression",
            tag: to_moz(M.prefix),
            quasi: to_moz(M.template_string)
        };
    });

    def_to_moz(AST_TemplateString, function To_Moz_TemplateLiteral(M) {
        var quasis = [];
        var expressions = [];
        for (var i = 0; i < M.segments.length; i++) {
            if (i % 2 !== 0) {
                expressions.push(to_moz(M.segments[i]));
            } else {
                quasis.push({
                    type: "TemplateElement",
                    value: {
                        raw: M.segments[i].raw,
                        cooked: M.segments[i].value
                    },
                    tail: i === M.segments.length - 1
                });
            }
        }
        return {
            type: "TemplateLiteral",
            quasis: quasis,
            expressions: expressions
        };
    });

    def_to_moz(AST_Defun, function To_Moz_FunctionDeclaration(M) {
        return {
            type: "FunctionDeclaration",
            id: to_moz(M.name),
            params: M.argnames.map(to_moz),
            generator: M.is_generator,
            async: M.async,
            body: to_moz_scope("BlockStatement", M)
        };
    });

    def_to_moz(AST_Function, function To_Moz_FunctionExpression(M, parent) {
        var is_generator = parent.is_generator !== undefined ?
            parent.is_generator : M.is_generator;
        return {
            type: "FunctionExpression",
            id: to_moz(M.name),
            params: M.argnames.map(to_moz),
            generator: is_generator,
            async: M.async,
            body: to_moz_scope("BlockStatement", M)
        };
    });

    def_to_moz(AST_Arrow, function To_Moz_ArrowFunctionExpression(M) {
        var body = {
            type: "BlockStatement",
            body: M.body.map(to_moz)
        };
        return {
            type: "ArrowFunctionExpression",
            params: M.argnames.map(to_moz),
            async: M.async,
            body: body
        };
    });

    def_to_moz(AST_Destructuring, function To_Moz_ObjectPattern(M) {
        if (M.is_array) {
            return {
                type: "ArrayPattern",
                elements: M.names.map(to_moz)
            };
        }
        return {
            type: "ObjectPattern",
            properties: M.names.map(to_moz)
        };
    });

    def_to_moz(AST_Directive, function To_Moz_Directive(M) {
        return {
            type: "ExpressionStatement",
            expression: {
                type: "Literal",
                value: M.value,
                raw: M.print_to_string()
            },
            directive: M.value
        };
    });

    def_to_moz(AST_SimpleStatement, function To_Moz_ExpressionStatement(M) {
        return {
            type: "ExpressionStatement",
            expression: to_moz(M.body)
        };
    });

    def_to_moz(AST_SwitchBranch, function To_Moz_SwitchCase(M) {
        return {
            type: "SwitchCase",
            test: to_moz(M.expression),
            consequent: M.body.map(to_moz)
        };
    });

    def_to_moz(AST_Try, function To_Moz_TryStatement(M) {
        return {
            type: "TryStatement",
            block: to_moz_block(M),
            handler: to_moz(M.bcatch),
            guardedHandlers: [],
            finalizer: to_moz(M.bfinally)
        };
    });

    def_to_moz(AST_Catch, function To_Moz_CatchClause(M) {
        return {
            type: "CatchClause",
            param: to_moz(M.argname),
            guard: null,
            body: to_moz_block(M)
        };
    });

    def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
        return {
            type: "VariableDeclaration",
            kind:
                M instanceof AST_Const ? "const" :
                M instanceof AST_Let ? "let" : "var",
            declarations: M.definitions.map(to_moz)
        };
    });

    const assert_clause_to_moz = assert_clause => {
        const assertions = [];
        if (assert_clause) {
            for (const { key, value } of assert_clause.properties) {
                const key_moz = is_basic_identifier_string(key)
                    ? { type: "Identifier", name: key }
                    : { type: "Literal", value: key, raw: JSON.stringify(key) };
                assertions.push({
                    type: "ImportAttribute",
                    key: key_moz,
                    value: to_moz(value)
                });
            }
        }
        return assertions;
    };

    def_to_moz(AST_Export, function To_Moz_ExportDeclaration(M) {
        if (M.exported_names) {
            if (M.exported_names[0].name.name === "*") {
                return {
                    type: "ExportAllDeclaration",
                    source: to_moz(M.module_name),
                    assertions: assert_clause_to_moz(M.assert_clause)
                };
            }
            return {
                type: "ExportNamedDeclaration",
                specifiers: M.exported_names.map(function (name_mapping) {
                    return {
                        type: "ExportSpecifier",
                        exported: to_moz(name_mapping.foreign_name),
                        local: to_moz(name_mapping.name)
                    };
                }),
                declaration: to_moz(M.exported_definition),
                source: to_moz(M.module_name),
                assertions: assert_clause_to_moz(M.assert_clause)
            };
        }
        return {
            type: M.is_default ? "ExportDefaultDeclaration" : "ExportNamedDeclaration",
            declaration: to_moz(M.exported_value || M.exported_definition)
        };
    });

    def_to_moz(AST_Import, function To_Moz_ImportDeclaration(M) {
        var specifiers = [];
        if (M.imported_name) {
            specifiers.push({
                type: "ImportDefaultSpecifier",
                local: to_moz(M.imported_name)
            });
        }
        if (M.imported_names && M.imported_names[0].foreign_name.name === "*") {
            specifiers.push({
                type: "ImportNamespaceSpecifier",
                local: to_moz(M.imported_names[0].name)
            });
        } else if (M.imported_names) {
            M.imported_names.forEach(function(name_mapping) {
                specifiers.push({
                    type: "ImportSpecifier",
                    local: to_moz(name_mapping.name),
                    imported: to_moz(name_mapping.foreign_name)
                });
            });
        }
        return {
            type: "ImportDeclaration",
            specifiers: specifiers,
            source: to_moz(M.module_name),
            assertions: assert_clause_to_moz(M.assert_clause)
        };
    });

    def_to_moz(AST_ImportMeta, function To_Moz_MetaProperty() {
        return {
            type: "MetaProperty",
            meta: {
                type: "Identifier",
                name: "import"
            },
            property: {
                type: "Identifier",
                name: "meta"
            }
        };
    });

    def_to_moz(AST_Sequence, function To_Moz_SequenceExpression(M) {
        return {
            type: "SequenceExpression",
            expressions: M.expressions.map(to_moz)
        };
    });

    def_to_moz(AST_DotHash, function To_Moz_PrivateMemberExpression(M) {
        return {
            type: "MemberExpression",
            object: to_moz(M.expression),
            computed: false,
            property: {
                type: "PrivateIdentifier",
                name: M.property
            },
            optional: M.optional
        };
    });

    def_to_moz(AST_PropAccess, function To_Moz_MemberExpression(M) {
        var isComputed = M instanceof AST_Sub;
        return {
            type: "MemberExpression",
            object: to_moz(M.expression),
            computed: isComputed,
            property: isComputed ? to_moz(M.property) : {type: "Identifier", name: M.property},
            optional: M.optional
        };
    });

    def_to_moz(AST_Chain, function To_Moz_ChainExpression(M) {
        return {
            type: "ChainExpression",
            expression: to_moz(M.expression)
        };
    });

    def_to_moz(AST_Unary, function To_Moz_Unary(M) {
        return {
            type: M.operator == "++" || M.operator == "--" ? "UpdateExpression" : "UnaryExpression",
            operator: M.operator,
            prefix: M instanceof AST_UnaryPrefix,
            argument: to_moz(M.expression)
        };
    });

    def_to_moz(AST_Binary, function To_Moz_BinaryExpression(M) {
        if (M.operator == "=" && to_moz_in_destructuring()) {
            return {
                type: "AssignmentPattern",
                left: to_moz(M.left),
                right: to_moz(M.right)
            };
        }

        const type = M.operator == "&&" || M.operator == "||" || M.operator === "??"
            ? "LogicalExpression"
            : "BinaryExpression";

        return {
            type,
            left: to_moz(M.left),
            operator: M.operator,
            right: to_moz(M.right)
        };
    });

    def_to_moz(AST_Array, function To_Moz_ArrayExpression(M) {
        return {
            type: "ArrayExpression",
            elements: M.elements.map(to_moz)
        };
    });

    def_to_moz(AST_Object, function To_Moz_ObjectExpression(M) {
        return {
            type: "ObjectExpression",
            properties: M.properties.map(to_moz)
        };
    });

    def_to_moz(AST_ObjectProperty, function To_Moz_Property(M, parent) {
        var key = M.key instanceof AST_Node ? to_moz(M.key) : {
            type: "Identifier",
            value: M.key
        };
        if (typeof M.key === "number") {
            key = {
                type: "Literal",
                value: Number(M.key)
            };
        }
        if (typeof M.key === "string") {
            key = {
                type: "Identifier",
                name: M.key
            };
        }
        var kind;
        var string_or_num = typeof M.key === "string" || typeof M.key === "number";
        var computed = string_or_num ? false : !(M.key instanceof AST_Symbol) || M.key instanceof AST_SymbolRef;
        if (M instanceof AST_ObjectKeyVal) {
            kind = "init";
            computed = !string_or_num;
        } else
        if (M instanceof AST_ObjectGetter) {
            kind = "get";
        } else
        if (M instanceof AST_ObjectSetter) {
            kind = "set";
        }
        if (M instanceof AST_PrivateGetter || M instanceof AST_PrivateSetter) {
            const kind = M instanceof AST_PrivateGetter ? "get" : "set";
            return {
                type: "MethodDefinition",
                computed: false,
                kind: kind,
                static: M.static,
                key: {
                    type: "PrivateIdentifier",
                    name: M.key.name
                },
                value: to_moz(M.value)
            };
        }
        if (M instanceof AST_ClassPrivateProperty) {
            return {
                type: "PropertyDefinition",
                key: {
                    type: "PrivateIdentifier",
                    name: M.key.name
                },
                value: to_moz(M.value),
                computed: false,
                static: M.static
            };
        }
        if (M instanceof AST_ClassProperty) {
            return {
                type: "PropertyDefinition",
                key,
                value: to_moz(M.value),
                computed,
                static: M.static
            };
        }
        if (parent instanceof AST_Class) {
            return {
                type: "MethodDefinition",
                computed: computed,
                kind: kind,
                static: M.static,
                key: to_moz(M.key),
                value: to_moz(M.value)
            };
        }
        return {
            type: "Property",
            computed: computed,
            kind: kind,
            key: key,
            value: to_moz(M.value)
        };
    });

    def_to_moz(AST_ConciseMethod, function To_Moz_MethodDefinition(M, parent) {
        if (parent instanceof AST_Object) {
            return {
                type: "Property",
                computed: !(M.key instanceof AST_Symbol) || M.key instanceof AST_SymbolRef,
                kind: "init",
                method: true,
                shorthand: false,
                key: to_moz(M.key),
                value: to_moz(M.value)
            };
        }

        const key = M instanceof AST_PrivateMethod
            ? {
                type: "PrivateIdentifier",
                name: M.key.name
            }
            : to_moz(M.key);

        return {
            type: "MethodDefinition",
            kind: M.key === "constructor" ? "constructor" : "method",
            key,
            value: to_moz(M.value),
            computed: !(M.key instanceof AST_Symbol) || M.key instanceof AST_SymbolRef,
            static: M.static,
        };
    });

    def_to_moz(AST_Class, function To_Moz_Class(M) {
        var type = M instanceof AST_ClassExpression ? "ClassExpression" : "ClassDeclaration";
        return {
            type: type,
            superClass: to_moz(M.extends),
            id: M.name ? to_moz(M.name) : null,
            body: {
                type: "ClassBody",
                body: M.properties.map(to_moz)
            }
        };
    });

    def_to_moz(AST_ClassStaticBlock, function To_Moz_StaticBlock(M) {
        return {
            type: "StaticBlock",
            body: M.body.map(to_moz),
        };
    });

    def_to_moz(AST_NewTarget, function To_Moz_MetaProperty() {
        return {
            type: "MetaProperty",
            meta: {
                type: "Identifier",
                name: "new"
            },
            property: {
                type: "Identifier",
                name: "target"
            }
        };
    });

    def_to_moz(AST_Symbol, function To_Moz_Identifier(M, parent) {
        if (M instanceof AST_SymbolMethod && parent.quote) {
            return {
                type: "Literal",
                value: M.name
            };
        }
        var def = M.definition();
        return {
            type: "Identifier",
            name: def ? def.mangled_name || def.name : M.name
        };
    });

    def_to_moz(AST_RegExp, function To_Moz_RegExpLiteral(M) {
        const pattern = M.value.source;
        const flags = M.value.flags;
        return {
            type: "Literal",
            value: null,
            raw: M.print_to_string(),
            regex: { pattern, flags }
        };
    });

    def_to_moz(AST_Constant, function To_Moz_Literal(M) {
        var value = M.value;
        return {
            type: "Literal",
            value: value,
            raw: M.raw || M.print_to_string()
        };
    });

    def_to_moz(AST_Atom, function To_Moz_Atom(M) {
        return {
            type: "Identifier",
            name: String(M.value)
        };
    });

    def_to_moz(AST_BigInt, M => ({
        type: "BigIntLiteral",
        value: M.value
    }));

    AST_Boolean.DEFMETHOD("to_mozilla_ast", AST_Constant.prototype.to_mozilla_ast);
    AST_Null.DEFMETHOD("to_mozilla_ast", AST_Constant.prototype.to_mozilla_ast);
    AST_Hole.DEFMETHOD("to_mozilla_ast", function To_Moz_ArrayHole() { return null; });

    AST_Block.DEFMETHOD("to_mozilla_ast", AST_BlockStatement.prototype.to_mozilla_ast);
    AST_Lambda.DEFMETHOD("to_mozilla_ast", AST_Function.prototype.to_mozilla_ast);

    /* -----[ tools ]----- */

    function my_start_token(moznode) {
        var loc = moznode.loc, start = loc && loc.start;
        var range = moznode.range;
        return new AST_Token(
            "",
            "",
            start && start.line || 0,
            start && start.column || 0,
            range ? range [0] : moznode.start,
            false,
            [],
            [],
            loc && loc.source,
        );
    }

    function my_end_token(moznode) {
        var loc = moznode.loc, end = loc && loc.end;
        var range = moznode.range;
        return new AST_Token(
            "",
            "",
            end && end.line || 0,
            end && end.column || 0,
            range ? range [0] : moznode.end,
            false,
            [],
            [],
            loc && loc.source,
        );
    }

    var FROM_MOZ_STACK = null;

    function from_moz(node) {
        FROM_MOZ_STACK.push(node);
        var ret = node != null ? MOZ_TO_ME[node.type](node) : null;
        FROM_MOZ_STACK.pop();
        return ret;
    }

    AST_Node.from_mozilla_ast = function(node) {
        var save_stack = FROM_MOZ_STACK;
        FROM_MOZ_STACK = [];
        var ast = from_moz(node);
        FROM_MOZ_STACK = save_stack;
        return ast;
    };

    function set_moz_loc(mynode, moznode) {
        var start = mynode.start;
        var end = mynode.end;
        if (!(start && end)) {
            return moznode;
        }
        if (start.pos != null && end.endpos != null) {
            moznode.range = [start.pos, end.endpos];
        }
        if (start.line) {
            moznode.loc = {
                start: {line: start.line, column: start.col},
                end: end.endline ? {line: end.endline, column: end.endcol} : null
            };
            if (start.file) {
                moznode.loc.source = start.file;
            }
        }
        return moznode;
    }

    function def_to_moz(mytype, handler) {
        mytype.DEFMETHOD("to_mozilla_ast", function(parent) {
            return set_moz_loc(this, handler(this, parent));
        });
    }

    var TO_MOZ_STACK = null;

    function to_moz(node) {
        if (TO_MOZ_STACK === null) { TO_MOZ_STACK = []; }
        TO_MOZ_STACK.push(node);
        var ast = node != null ? node.to_mozilla_ast(TO_MOZ_STACK[TO_MOZ_STACK.length - 2]) : null;
        TO_MOZ_STACK.pop();
        if (TO_MOZ_STACK.length === 0) { TO_MOZ_STACK = null; }
        return ast;
    }

    function to_moz_in_destructuring() {
        var i = TO_MOZ_STACK.length;
        while (i--) {
            if (TO_MOZ_STACK[i] instanceof AST_Destructuring) {
                return true;
            }
        }
        return false;
    }

    function to_moz_block(node) {
        return {
            type: "BlockStatement",
            body: node.body.map(to_moz)
        };
    }

    function to_moz_scope(type, node) {
        var body = node.body.map(to_moz);
        if (node.body[0] instanceof AST_SimpleStatement && node.body[0].body instanceof AST_String) {
            body.unshift(to_moz(new AST_EmptyStatement(node.body[0])));
        }
        return {
            type: type,
            body: body
        };
    }
})();

// return true if the node at the top of the stack (that means the
// innermost node in the current output) is lexically the first in
// a statement.
function first_in_statement(stack) {
    let node = stack.parent(-1);
    for (let i = 0, p; p = stack.parent(i); i++) {
        if (p instanceof AST_Statement && p.body === node)
            return true;
        if ((p instanceof AST_Sequence && p.expressions[0] === node) ||
            (p.TYPE === "Call" && p.expression === node) ||
            (p instanceof AST_PrefixedTemplateString && p.prefix === node) ||
            (p instanceof AST_Dot && p.expression === node) ||
            (p instanceof AST_Sub && p.expression === node) ||
            (p instanceof AST_Chain && p.expression === node) ||
            (p instanceof AST_Conditional && p.condition === node) ||
            (p instanceof AST_Binary && p.left === node) ||
            (p instanceof AST_UnaryPostfix && p.expression === node)
        ) {
            node = p;
        } else {
            return false;
        }
    }
}

// Returns whether the leftmost item in the expression is an object
function left_is_object(node) {
    if (node instanceof AST_Object) return true;
    if (node instanceof AST_Sequence) return left_is_object(node.expressions[0]);
    if (node.TYPE === "Call") return left_is_object(node.expression);
    if (node instanceof AST_PrefixedTemplateString) return left_is_object(node.prefix);
    if (node instanceof AST_Dot || node instanceof AST_Sub) return left_is_object(node.expression);
    if (node instanceof AST_Chain) return left_is_object(node.expression);
    if (node instanceof AST_Conditional) return left_is_object(node.condition);
    if (node instanceof AST_Binary) return left_is_object(node.left);
    if (node instanceof AST_UnaryPostfix) return left_is_object(node.expression);
    return false;
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

const EXPECT_DIRECTIVE = /^$|[;{][\s\n]*$/;
const CODE_LINE_BREAK = 10;
const CODE_SPACE = 32;

const r_annotation = /[@#]__(PURE|INLINE|NOINLINE)__/g;

function is_some_comments(comment) {
    // multiline comment
    return (
        (comment.type === "comment2" || comment.type === "comment1")
        && /@preserve|@copyright|@lic|@cc_on|^\**!/i.test(comment.value)
    );
}

class Rope {
    constructor() {
        this.committed = "";
        this.current = "";
    }

    append(str) {
        this.current += str;
    }

    insertAt(char, index) {
        const { committed, current } = this;
        if (index < committed.length) {
            this.committed = committed.slice(0, index) + char + committed.slice(index);
        } else if (index === committed.length) {
            this.committed += char;
        } else {
            index -= committed.length;
            this.committed += current.slice(0, index) + char;
            this.current = current.slice(index);
        }
    }

    charAt(index) {
        const { committed } = this;
        if (index < committed.length) return committed[index];
        return this.current[index - committed.length];
    }

    curLength() {
        return this.current.length;
    }

    length() {
        return this.committed.length + this.current.length;
    }

    toString() {
        return this.committed + this.current;
    }
}

function OutputStream(options) {

    var readonly = !options;
    options = defaults(options, {
        ascii_only           : false,
        beautify             : false,
        braces               : false,
        comments             : "some",
        ecma                 : 5,
        ie8                  : false,
        indent_level         : 4,
        indent_start         : 0,
        inline_script        : true,
        keep_numbers         : false,
        keep_quoted_props    : false,
        max_line_len         : false,
        preamble             : null,
        preserve_annotations : false,
        quote_keys           : false,
        quote_style          : 0,
        safari10             : false,
        semicolons           : true,
        shebang              : true,
        shorthand            : undefined,
        source_map           : null,
        webkit               : false,
        width                : 80,
        wrap_iife            : false,
        wrap_func_args       : true,

        _destroy_ast         : false
    }, true);

    if (options.shorthand === undefined)
        options.shorthand = options.ecma > 5;

    // Convert comment option to RegExp if necessary and set up comments filter
    var comment_filter = return_false; // Default case, throw all comments away
    if (options.comments) {
        let comments = options.comments;
        if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) {
            var regex_pos = options.comments.lastIndexOf("/");
            comments = new RegExp(
                options.comments.substr(1, regex_pos - 1),
                options.comments.substr(regex_pos + 1)
            );
        }
        if (comments instanceof RegExp) {
            comment_filter = function(comment) {
                return comment.type != "comment5" && comments.test(comment.value);
            };
        } else if (typeof comments === "function") {
            comment_filter = function(comment) {
                return comment.type != "comment5" && comments(this, comment);
            };
        } else if (comments === "some") {
            comment_filter = is_some_comments;
        } else { // NOTE includes "all" option
            comment_filter = return_true;
        }
    }

    var indentation = 0;
    var current_col = 0;
    var current_line = 1;
    var current_pos = 0;
    var OUTPUT = new Rope();
    let printed_comments = new Set();

    var to_utf8 = options.ascii_only ? function(str, identifier = false, regexp = false) {
        if (options.ecma >= 2015 && !options.safari10 && !regexp) {
            str = str.replace(/[\ud800-\udbff][\udc00-\udfff]/g, function(ch) {
                var code = get_full_char_code(ch, 0).toString(16);
                return "\\u{" + code + "}";
            });
        }
        return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
            var code = ch.charCodeAt(0).toString(16);
            if (code.length <= 2 && !identifier) {
                while (code.length < 2) code = "0" + code;
                return "\\x" + code;
            } else {
                while (code.length < 4) code = "0" + code;
                return "\\u" + code;
            }
        });
    } : function(str) {
        return str.replace(/[\ud800-\udbff][\udc00-\udfff]|([\ud800-\udbff]|[\udc00-\udfff])/g, function(match, lone) {
            if (lone) {
                return "\\u" + lone.charCodeAt(0).toString(16);
            }
            return match;
        });
    };

    function make_string(str, quote) {
        var dq = 0, sq = 0;
        str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g,
          function(s, i) {
            switch (s) {
              case '"': ++dq; return '"';
              case "'": ++sq; return "'";
              case "\\": return "\\\\";
              case "\n": return "\\n";
              case "\r": return "\\r";
              case "\t": return "\\t";
              case "\b": return "\\b";
              case "\f": return "\\f";
              case "\x0B": return options.ie8 ? "\\x0B" : "\\v";
              case "\u2028": return "\\u2028";
              case "\u2029": return "\\u2029";
              case "\ufeff": return "\\ufeff";
              case "\0":
                  return /[0-9]/.test(get_full_char(str, i+1)) ? "\\x00" : "\\0";
            }
            return s;
        });
        function quote_single() {
            return "'" + str.replace(/\x27/g, "\\'") + "'";
        }
        function quote_double() {
            return '"' + str.replace(/\x22/g, '\\"') + '"';
        }
        function quote_template() {
            return "`" + str.replace(/`/g, "\\`") + "`";
        }
        str = to_utf8(str);
        if (quote === "`") return quote_template();
        switch (options.quote_style) {
          case 1:
            return quote_single();
          case 2:
            return quote_double();
          case 3:
            return quote == "'" ? quote_single() : quote_double();
          default:
            return dq > sq ? quote_single() : quote_double();
        }
    }

    function encode_string(str, quote) {
        var ret = make_string(str, quote);
        if (options.inline_script) {
            ret = ret.replace(/<\x2f(script)([>\/\t\n\f\r ])/gi, "<\\/$1$2");
            ret = ret.replace(/\x3c!--/g, "\\x3c!--");
            ret = ret.replace(/--\x3e/g, "--\\x3e");
        }
        return ret;
    }

    function make_name(name) {
        name = name.toString();
        name = to_utf8(name, true);
        return name;
    }

    function make_indent(back) {
        return " ".repeat(options.indent_start + indentation - back * options.indent_level);
    }

    /* -----[ beautification/minification ]----- */

    var has_parens = false;
    var might_need_space = false;
    var might_need_semicolon = false;
    var might_add_newline = 0;
    var need_newline_indented = false;
    var need_space = false;
    var newline_insert = -1;
    var last = "";
    var mapping_token, mapping_name, mappings = options.source_map && [];

    var do_add_mapping = mappings ? function() {
        mappings.forEach(function(mapping) {
            try {
                let { name, token } = mapping;
                if (token.type == "name" || token.type === "privatename") {
                    name = token.value;
                } else if (name instanceof AST_Symbol) {
                    name = token.type === "string" ? token.value : name.name;
                }
                options.source_map.add(
                    mapping.token.file,
                    mapping.line, mapping.col,
                    mapping.token.line, mapping.token.col,
                    is_basic_identifier_string(name) ? name : undefined
                );
            } catch(ex) {
                // Ignore bad mapping
            }
        });
        mappings = [];
    } : noop;

    var ensure_line_len = options.max_line_len ? function() {
        if (current_col > options.max_line_len) {
            if (might_add_newline) {
                OUTPUT.insertAt("\n", might_add_newline);
                const curLength = OUTPUT.curLength();
                if (mappings) {
                    var delta = curLength - current_col;
                    mappings.forEach(function(mapping) {
                        mapping.line++;
                        mapping.col += delta;
                    });
                }
                current_line++;
                current_pos++;
                current_col = curLength;
            }
        }
        if (might_add_newline) {
            might_add_newline = 0;
            do_add_mapping();
        }
    } : noop;

    var requireSemicolonChars = makePredicate("( [ + * / - , . `");

    function print(str) {
        str = String(str);
        var ch = get_full_char(str, 0);
        if (need_newline_indented && ch) {
            need_newline_indented = false;
            if (ch !== "\n") {
                print("\n");
                indent();
            }
        }
        if (need_space && ch) {
            need_space = false;
            if (!/[\s;})]/.test(ch)) {
                space();
            }
        }
        newline_insert = -1;
        var prev = last.charAt(last.length - 1);
        if (might_need_semicolon) {
            might_need_semicolon = false;

            if (prev === ":" && ch === "}" || (!ch || !";}".includes(ch)) && prev !== ";") {
                if (options.semicolons || requireSemicolonChars.has(ch)) {
                    OUTPUT.append(";");
                    current_col++;
                    current_pos++;
                } else {
                    ensure_line_len();
                    if (current_col > 0) {
                        OUTPUT.append("\n");
                        current_pos++;
                        current_line++;
                        current_col = 0;
                    }

                    if (/^\s+$/.test(str)) {
                        // reset the semicolon flag, since we didn't print one
                        // now and might still have to later
                        might_need_semicolon = true;
                    }
                }

                if (!options.beautify)
                    might_need_space = false;
            }
        }

        if (might_need_space) {
            if ((is_identifier_char(prev)
                    && (is_identifier_char(ch) || ch == "\\"))
                || (ch == "/" && ch == prev)
                || ((ch == "+" || ch == "-") && ch == last)
            ) {
                OUTPUT.append(" ");
                current_col++;
                current_pos++;
            }
            might_need_space = false;
        }

        if (mapping_token) {
            mappings.push({
                token: mapping_token,
                name: mapping_name,
                line: current_line,
                col: current_col
            });
            mapping_token = false;
            if (!might_add_newline) do_add_mapping();
        }

        OUTPUT.append(str);
        has_parens = str[str.length - 1] == "(";
        current_pos += str.length;
        var a = str.split(/\r?\n/), n = a.length - 1;
        current_line += n;
        current_col += a[0].length;
        if (n > 0) {
            ensure_line_len();
            current_col = a[n].length;
        }
        last = str;
    }

    var star = function() {
        print("*");
    };

    var space = options.beautify ? function() {
        print(" ");
    } : function() {
        might_need_space = true;
    };

    var indent = options.beautify ? function(half) {
        if (options.beautify) {
            print(make_indent(half ? 0.5 : 0));
        }
    } : noop;

    var with_indent = options.beautify ? function(col, cont) {
        if (col === true) col = next_indent();
        var save_indentation = indentation;
        indentation = col;
        var ret = cont();
        indentation = save_indentation;
        return ret;
    } : function(col, cont) { return cont(); };

    var newline = options.beautify ? function() {
        if (newline_insert < 0) return print("\n");
        if (OUTPUT.charAt(newline_insert) != "\n") {
            OUTPUT.insertAt("\n", newline_insert);
            current_pos++;
            current_line++;
        }
        newline_insert++;
    } : options.max_line_len ? function() {
        ensure_line_len();
        might_add_newline = OUTPUT.length();
    } : noop;

    var semicolon = options.beautify ? function() {
        print(";");
    } : function() {
        might_need_semicolon = true;
    };

    function force_semicolon() {
        might_need_semicolon = false;
        print(";");
    }

    function next_indent() {
        return indentation + options.indent_level;
    }

    function with_block(cont) {
        var ret;
        print("{");
        newline();
        with_indent(next_indent(), function() {
            ret = cont();
        });
        indent();
        print("}");
        return ret;
    }

    function with_parens(cont) {
        print("(");
        //XXX: still nice to have that for argument lists
        //var ret = with_indent(current_col, cont);
        var ret = cont();
        print(")");
        return ret;
    }

    function with_square(cont) {
        print("[");
        //var ret = with_indent(current_col, cont);
        var ret = cont();
        print("]");
        return ret;
    }

    function comma() {
        print(",");
        space();
    }

    function colon() {
        print(":");
        space();
    }

    var add_mapping = mappings ? function(token, name) {
        mapping_token = token;
        mapping_name = name;
    } : noop;

    function get() {
        if (might_add_newline) {
            ensure_line_len();
        }
        return OUTPUT.toString();
    }

    function has_nlb() {
        const output = OUTPUT.toString();
        let n = output.length - 1;
        while (n >= 0) {
            const code = output.charCodeAt(n);
            if (code === CODE_LINE_BREAK) {
                return true;
            }

            if (code !== CODE_SPACE) {
                return false;
            }
            n--;
        }
        return true;
    }

    function filter_comment(comment) {
        if (!options.preserve_annotations) {
            comment = comment.replace(r_annotation, " ");
        }
        if (/^\s*$/.test(comment)) {
            return "";
        }
        return comment.replace(/(<\s*\/\s*)(script)/i, "<\\/$2");
    }

    function prepend_comments(node) {
        var self = this;
        var start = node.start;
        if (!start) return;
        var printed_comments = self.printed_comments;

        // There cannot be a newline between return and its value.
        const return_with_value = node instanceof AST_Exit && node.value;

        if (
            start.comments_before
            && printed_comments.has(start.comments_before)
        ) {
            if (return_with_value) {
                start.comments_before = [];
            } else {
                return;
            }
        }

        var comments = start.comments_before;
        if (!comments) {
            comments = start.comments_before = [];
        }
        printed_comments.add(comments);

        if (return_with_value) {
            var tw = new TreeWalker(function(node) {
                var parent = tw.parent();
                if (parent instanceof AST_Exit
                    || parent instanceof AST_Binary && parent.left === node
                    || parent.TYPE == "Call" && parent.expression === node
                    || parent instanceof AST_Conditional && parent.condition === node
                    || parent instanceof AST_Dot && parent.expression === node
                    || parent instanceof AST_Sequence && parent.expressions[0] === node
                    || parent instanceof AST_Sub && parent.expression === node
                    || parent instanceof AST_UnaryPostfix) {
                    if (!node.start) return;
                    var text = node.start.comments_before;
                    if (text && !printed_comments.has(text)) {
                        printed_comments.add(text);
                        comments = comments.concat(text);
                    }
                } else {
                    return true;
                }
            });
            tw.push(node);
            node.value.walk(tw);
        }

        if (current_pos == 0) {
            if (comments.length > 0 && options.shebang && comments[0].type === "comment5"
                && !printed_comments.has(comments[0])) {
                print("#!" + comments.shift().value + "\n");
                indent();
            }
            var preamble = options.preamble;
            if (preamble) {
                print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
            }
        }

        comments = comments.filter(comment_filter, node).filter(c => !printed_comments.has(c));
        if (comments.length == 0) return;
        var last_nlb = has_nlb();
        comments.forEach(function(c, i) {
            printed_comments.add(c);
            if (!last_nlb) {
                if (c.nlb) {
                    print("\n");
                    indent();
                    last_nlb = true;
                } else if (i > 0) {
                    space();
                }
            }

            if (/comment[134]/.test(c.type)) {
                var value = filter_comment(c.value);
                if (value) {
                    print("//" + value + "\n");
                    indent();
                }
                last_nlb = true;
            } else if (c.type == "comment2") {
                var value = filter_comment(c.value);
                if (value) {
                    print("/*" + value + "*/");
                }
                last_nlb = false;
            }
        });
        if (!last_nlb) {
            if (start.nlb) {
                print("\n");
                indent();
            } else {
                space();
            }
        }
    }

    function append_comments(node, tail) {
        var self = this;
        var token = node.end;
        if (!token) return;
        var printed_comments = self.printed_comments;
        var comments = token[tail ? "comments_before" : "comments_after"];
        if (!comments || printed_comments.has(comments)) return;
        if (!(node instanceof AST_Statement || comments.every((c) =>
            !/comment[134]/.test(c.type)
        ))) return;
        printed_comments.add(comments);
        var insert = OUTPUT.length();
        comments.filter(comment_filter, node).forEach(function(c, i) {
            if (printed_comments.has(c)) return;
            printed_comments.add(c);
            need_space = false;
            if (need_newline_indented) {
                print("\n");
                indent();
                need_newline_indented = false;
            } else if (c.nlb && (i > 0 || !has_nlb())) {
                print("\n");
                indent();
            } else if (i > 0 || !tail) {
                space();
            }
            if (/comment[134]/.test(c.type)) {
                const value = filter_comment(c.value);
                if (value) {
                    print("//" + value);
                }
                need_newline_indented = true;
            } else if (c.type == "comment2") {
                const value = filter_comment(c.value);
                if (value) {
                    print("/*" + value + "*/");
                }
                need_space = true;
            }
        });
        if (OUTPUT.length() > insert) newline_insert = insert;
    }

    /**
     * When output.option("_destroy_ast") is enabled, destroy the function.
     * Call this after printing it.
     */
    const gc_scope =
      options["_destroy_ast"]
        ? function gc_scope(scope) {
            scope.body.length = 0;
            scope.argnames.length = 0;
        }
        : noop;

    var stack = [];
    return {
        get             : get,
        toString        : get,
        indent          : indent,
        in_directive    : false,
        use_asm         : null,
        active_scope    : null,
        indentation     : function() { return indentation; },
        current_width   : function() { return current_col - indentation; },
        should_break    : function() { return options.width && this.current_width() >= options.width; },
        has_parens      : function() { return has_parens; },
        newline         : newline,
        print           : print,
        star            : star,
        space           : space,
        comma           : comma,
        colon           : colon,
        last            : function() { return last; },
        semicolon       : semicolon,
        force_semicolon : force_semicolon,
        to_utf8         : to_utf8,
        print_name      : function(name) { print(make_name(name)); },
        print_string    : function(str, quote, escape_directive) {
            var encoded = encode_string(str, quote);
            if (escape_directive === true && !encoded.includes("\\")) {
                // Insert semicolons to break directive prologue
                if (!EXPECT_DIRECTIVE.test(OUTPUT.toString())) {
                    force_semicolon();
                }
                force_semicolon();
            }
            print(encoded);
        },
        print_template_string_chars: function(str) {
            var encoded = encode_string(str, "`").replace(/\${/g, "\\${");
            return print(encoded.substr(1, encoded.length - 2));
        },
        encode_string   : encode_string,
        next_indent     : next_indent,
        with_indent     : with_indent,
        with_block      : with_block,
        with_parens     : with_parens,
        with_square     : with_square,
        add_mapping     : add_mapping,
        option          : function(opt) { return options[opt]; },
        gc_scope,
        printed_comments: printed_comments,
        prepend_comments: readonly ? noop : prepend_comments,
        append_comments : readonly || comment_filter === return_false ? noop : append_comments,
        line            : function() { return current_line; },
        col             : function() { return current_col; },
        pos             : function() { return current_pos; },
        push_node       : function(node) { stack.push(node); },
        pop_node        : function() { return stack.pop(); },
        parent          : function(n) {
            return stack[stack.length - 2 - (n || 0)];
        }
    };

}

/* -----[ code generators ]----- */

(function() {

    /* -----[ utils ]----- */

    function DEFPRINT(nodetype, generator) {
        nodetype.DEFMETHOD("_codegen", generator);
    }

    AST_Node.DEFMETHOD("print", function(output, force_parens) {
        var self = this, generator = self._codegen;
        if (self instanceof AST_Scope) {
            output.active_scope = self;
        } else if (!output.use_asm && self instanceof AST_Directive && self.value == "use asm") {
            output.use_asm = output.active_scope;
        }
        function doit() {
            output.prepend_comments(self);
            self.add_source_map(output);
            generator(self, output);
            output.append_comments(self);
        }
        output.push_node(self);
        if (force_parens || self.needs_parens(output)) {
            output.with_parens(doit);
        } else {
            doit();
        }
        output.pop_node();
        if (self === output.use_asm) {
            output.use_asm = null;
        }
    });
    AST_Node.DEFMETHOD("_print", AST_Node.prototype.print);

    AST_Node.DEFMETHOD("print_to_string", function(options) {
        var output = OutputStream(options);
        this.print(output);
        return output.get();
    });

    /* -----[ PARENTHESES ]----- */

    function PARENS(nodetype, func) {
        if (Array.isArray(nodetype)) {
            nodetype.forEach(function(nodetype) {
                PARENS(nodetype, func);
            });
        } else {
            nodetype.DEFMETHOD("needs_parens", func);
        }
    }

    PARENS(AST_Node, return_false);

    // a function expression needs parens around it when it's provably
    // the first token to appear in a statement.
    PARENS(AST_Function, function(output) {
        if (!output.has_parens() && first_in_statement(output)) {
            return true;
        }

        if (output.option("webkit")) {
            var p = output.parent();
            if (p instanceof AST_PropAccess && p.expression === this) {
                return true;
            }
        }

        if (output.option("wrap_iife")) {
            var p = output.parent();
            if (p instanceof AST_Call && p.expression === this) {
                return true;
            }
        }

        if (output.option("wrap_func_args")) {
            var p = output.parent();
            if (p instanceof AST_Call && p.args.includes(this)) {
                return true;
            }
        }

        return false;
    });

    PARENS(AST_Arrow, function(output) {
        var p = output.parent();

        if (
            output.option("wrap_func_args")
            && p instanceof AST_Call
            && p.args.includes(this)
        ) {
            return true;
        }
        return p instanceof AST_PropAccess && p.expression === this;
    });

    // same goes for an object literal (as in AST_Function), because
    // otherwise {...} would be interpreted as a block of code.
    PARENS(AST_Object, function(output) {
        return !output.has_parens() && first_in_statement(output);
    });

    PARENS(AST_ClassExpression, first_in_statement);

    PARENS(AST_Unary, function(output) {
        var p = output.parent();
        return p instanceof AST_PropAccess && p.expression === this
            || p instanceof AST_Call && p.expression === this
            || p instanceof AST_Binary
                && p.operator === "**"
                && this instanceof AST_UnaryPrefix
                && p.left === this
                && this.operator !== "++"
                && this.operator !== "--";
    });

    PARENS(AST_Await, function(output) {
        var p = output.parent();
        return p instanceof AST_PropAccess && p.expression === this
            || p instanceof AST_Call && p.expression === this
            || p instanceof AST_Binary && p.operator === "**" && p.left === this
            || output.option("safari10") && p instanceof AST_UnaryPrefix;
    });

    PARENS(AST_Sequence, function(output) {
        var p = output.parent();
        return p instanceof AST_Call                          // (foo, bar)() or foo(1, (2, 3), 4)
            || p instanceof AST_Unary                         // !(foo, bar, baz)
            || p instanceof AST_Binary                        // 1 + (2, 3) + 4 ==> 8
            || p instanceof AST_VarDef                        // var a = (1, 2), b = a + a; ==> b == 4
            || p instanceof AST_PropAccess                    // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
            || p instanceof AST_Array                         // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
            || p instanceof AST_ObjectProperty                // { foo: (1, 2) }.foo ==> 2
            || p instanceof AST_Conditional                   /* (false, true) ? (a = 10, b = 20) : (c = 30)
                                                               * ==> 20 (side effect, set a := 10 and b := 20) */
            || p instanceof AST_Arrow                         // x => (x, x)
            || p instanceof AST_DefaultAssign                 // x => (x = (0, function(){}))
            || p instanceof AST_Expansion                     // [...(a, b)]
            || p instanceof AST_ForOf && this === p.object    // for (e of (foo, bar)) {}
            || p instanceof AST_Yield                         // yield (foo, bar)
            || p instanceof AST_Export                        // export default (foo, bar)
        ;
    });

    PARENS(AST_Binary, function(output) {
        var p = output.parent();
        // (foo && bar)()
        if (p instanceof AST_Call && p.expression === this)
            return true;
        // typeof (foo && bar)
        if (p instanceof AST_Unary)
            return true;
        // (foo && bar)["prop"], (foo && bar).prop
        if (p instanceof AST_PropAccess && p.expression === this)
            return true;
        // this deals with precedence: 3 * (2 + 1)
        if (p instanceof AST_Binary) {
            const po = p.operator;
            const so = this.operator;

            if (so === "??" && (po === "||" || po === "&&")) {
                return true;
            }

            if (po === "??" && (so === "||" || so === "&&")) {
                return true;
            }

            const pp = PRECEDENCE[po];
            const sp = PRECEDENCE[so];
            if (pp > sp
                || (pp == sp
                    && (this === p.right || po == "**"))) {
                return true;
            }
        }
    });

    PARENS(AST_Yield, function(output) {
        var p = output.parent();
        // (yield 1) + (yield 2)
        // a = yield 3
        if (p instanceof AST_Binary && p.operator !== "=")
            return true;
        // (yield 1)()
        // new (yield 1)()
        if (p instanceof AST_Call && p.expression === this)
            return true;
        // (yield 1) ? yield 2 : yield 3
        if (p instanceof AST_Conditional && p.condition === this)
            return true;
        // -(yield 4)
        if (p instanceof AST_Unary)
            return true;
        // (yield x).foo
        // (yield x)['foo']
        if (p instanceof AST_PropAccess && p.expression === this)
            return true;
    });

    PARENS(AST_PropAccess, function(output) {
        var p = output.parent();
        if (p instanceof AST_New && p.expression === this) {
            // i.e. new (foo.bar().baz)
            //
            // if there's one call into this subtree, then we need
            // parens around it too, otherwise the call will be
            // interpreted as passing the arguments to the upper New
            // expression.
            return walk(this, node => {
                if (node instanceof AST_Scope) return true;
                if (node instanceof AST_Call) {
                    return walk_abort;  // makes walk() return true.
                }
            });
        }
    });

    PARENS(AST_Call, function(output) {
        var p = output.parent(), p1;
        if (p instanceof AST_New && p.expression === this
            || p instanceof AST_Export && p.is_default && this.expression instanceof AST_Function)
            return true;

        // workaround for Safari bug.
        // https://bugs.webkit.org/show_bug.cgi?id=123506
        return this.expression instanceof AST_Function
            && p instanceof AST_PropAccess
            && p.expression === this
            && (p1 = output.parent(1)) instanceof AST_Assign
            && p1.left === p;
    });

    PARENS(AST_New, function(output) {
        var p = output.parent();
        if (this.args.length === 0
            && (p instanceof AST_PropAccess // (new Date).getTime(), (new Date)["getTime"]()
                || p instanceof AST_Call && p.expression === this
                || p instanceof AST_PrefixedTemplateString && p.prefix === this)) // (new foo)(bar)
            return true;
    });

    PARENS(AST_Number, function(output) {
        var p = output.parent();
        if (p instanceof AST_PropAccess && p.expression === this) {
            var value = this.getValue();
            if (value < 0 || /^0/.test(make_num(value))) {
                return true;
            }
        }
    });

    PARENS(AST_BigInt, function(output) {
        var p = output.parent();
        if (p instanceof AST_PropAccess && p.expression === this) {
            var value = this.getValue();
            if (value.startsWith("-")) {
                return true;
            }
        }
    });

    PARENS([ AST_Assign, AST_Conditional ], function(output) {
        var p = output.parent();
        // !(a = false) → true
        if (p instanceof AST_Unary)
            return true;
        // 1 + (a = 2) + 3 → 6, side effect setting a = 2
        if (p instanceof AST_Binary && !(p instanceof AST_Assign))
            return true;
        // (a = func)() —or— new (a = Object)()
        if (p instanceof AST_Call && p.expression === this)
            return true;
        // (a = foo) ? bar : baz
        if (p instanceof AST_Conditional && p.condition === this)
            return true;
        // (a = foo)["prop"] —or— (a = foo).prop
        if (p instanceof AST_PropAccess && p.expression === this)
            return true;
        // ({a, b} = {a: 1, b: 2}), a destructuring assignment
        if (this instanceof AST_Assign && this.left instanceof AST_Destructuring && this.left.is_array === false)
            return true;
    });

    /* -----[ PRINTERS ]----- */

    DEFPRINT(AST_Directive, function(self, output) {
        output.print_string(self.value, self.quote);
        output.semicolon();
    });

    DEFPRINT(AST_Expansion, function (self, output) {
        output.print("...");
        self.expression.print(output);
    });

    DEFPRINT(AST_Destructuring, function (self, output) {
        output.print(self.is_array ? "[" : "{");
        var len = self.names.length;
        self.names.forEach(function (name, i) {
            if (i > 0) output.comma();
            name.print(output);
            // If the final element is a hole, we need to make sure it
            // doesn't look like a trailing comma, by inserting an actual
            // trailing comma.
            if (i == len - 1 && name instanceof AST_Hole) output.comma();
        });
        output.print(self.is_array ? "]" : "}");
    });

    DEFPRINT(AST_Debugger, function(self, output) {
        output.print("debugger");
        output.semicolon();
    });

    /* -----[ statements ]----- */

    function display_body(body, is_toplevel, output, allow_directives) {
        var last = body.length - 1;
        output.in_directive = allow_directives;
        body.forEach(function(stmt, i) {
            if (output.in_directive === true && !(stmt instanceof AST_Directive ||
                stmt instanceof AST_EmptyStatement ||
                (stmt instanceof AST_SimpleStatement && stmt.body instanceof AST_String)
            )) {
                output.in_directive = false;
            }
            if (!(stmt instanceof AST_EmptyStatement)) {
                output.indent();
                stmt.print(output);
                if (!(i == last && is_toplevel)) {
                    output.newline();
                    if (is_toplevel) output.newline();
                }
            }
            if (output.in_directive === true &&
                stmt instanceof AST_SimpleStatement &&
                stmt.body instanceof AST_String
            ) {
                output.in_directive = false;
            }
        });
        output.in_directive = false;
    }

    AST_StatementWithBody.DEFMETHOD("_do_print_body", function(output) {
        force_statement(this.body, output);
    });

    DEFPRINT(AST_Statement, function(self, output) {
        self.body.print(output);
        output.semicolon();
    });
    DEFPRINT(AST_Toplevel, function(self, output) {
        display_body(self.body, true, output, true);
        output.print("");
    });
    DEFPRINT(AST_LabeledStatement, function(self, output) {
        self.label.print(output);
        output.colon();
        self.body.print(output);
    });
    DEFPRINT(AST_SimpleStatement, function(self, output) {
        self.body.print(output);
        output.semicolon();
    });
    function print_braced_empty(self, output) {
        output.print("{");
        output.with_indent(output.next_indent(), function() {
            output.append_comments(self, true);
        });
        output.add_mapping(self.end);
        output.print("}");
    }
    function print_braced(self, output, allow_directives) {
        if (self.body.length > 0) {
            output.with_block(function() {
                display_body(self.body, false, output, allow_directives);
                output.add_mapping(self.end);
            });
        } else print_braced_empty(self, output);
    }
    DEFPRINT(AST_BlockStatement, function(self, output) {
        print_braced(self, output);
    });
    DEFPRINT(AST_EmptyStatement, function(self, output) {
        output.semicolon();
    });
    DEFPRINT(AST_Do, function(self, output) {
        output.print("do");
        output.space();
        make_block(self.body, output);
        output.space();
        output.print("while");
        output.space();
        output.with_parens(function() {
            self.condition.print(output);
        });
        output.semicolon();
    });
    DEFPRINT(AST_While, function(self, output) {
        output.print("while");
        output.space();
        output.with_parens(function() {
            self.condition.print(output);
        });
        output.space();
        self._do_print_body(output);
    });
    DEFPRINT(AST_For, function(self, output) {
        output.print("for");
        output.space();
        output.with_parens(function() {
            if (self.init) {
                if (self.init instanceof AST_Definitions) {
                    self.init.print(output);
                } else {
                    parenthesize_for_noin(self.init, output, true);
                }
                output.print(";");
                output.space();
            } else {
                output.print(";");
            }
            if (self.condition) {
                self.condition.print(output);
                output.print(";");
                output.space();
            } else {
                output.print(";");
            }
            if (self.step) {
                self.step.print(output);
            }
        });
        output.space();
        self._do_print_body(output);
    });
    DEFPRINT(AST_ForIn, function(self, output) {
        output.print("for");
        if (self.await) {
            output.space();
            output.print("await");
        }
        output.space();
        output.with_parens(function() {
            self.init.print(output);
            output.space();
            output.print(self instanceof AST_ForOf ? "of" : "in");
            output.space();
            self.object.print(output);
        });
        output.space();
        self._do_print_body(output);
    });
    DEFPRINT(AST_With, function(self, output) {
        output.print("with");
        output.space();
        output.with_parens(function() {
            self.expression.print(output);
        });
        output.space();
        self._do_print_body(output);
    });

    /* -----[ functions ]----- */
    AST_Lambda.DEFMETHOD("_do_print", function(output, nokeyword) {
        var self = this;
        if (!nokeyword) {
            if (self.async) {
                output.print("async");
                output.space();
            }
            output.print("function");
            if (self.is_generator) {
                output.star();
            }
            if (self.name) {
                output.space();
            }
        }
        if (self.name instanceof AST_Symbol) {
            self.name.print(output);
        } else if (nokeyword && self.name instanceof AST_Node) {
            output.with_square(function() {
                self.name.print(output); // Computed method name
            });
        }
        output.with_parens(function() {
            self.argnames.forEach(function(arg, i) {
                if (i) output.comma();
                arg.print(output);
            });
        });
        output.space();
        print_braced(self, output, true);
    });
    DEFPRINT(AST_Lambda, function(self, output) {
        self._do_print(output);
        output.gc_scope(self);
    });

    DEFPRINT(AST_PrefixedTemplateString, function(self, output) {
        var tag = self.prefix;
        var parenthesize_tag = tag instanceof AST_Lambda
            || tag instanceof AST_Binary
            || tag instanceof AST_Conditional
            || tag instanceof AST_Sequence
            || tag instanceof AST_Unary
            || tag instanceof AST_Dot && tag.expression instanceof AST_Object;
        if (parenthesize_tag) output.print("(");
        self.prefix.print(output);
        if (parenthesize_tag) output.print(")");
        self.template_string.print(output);
    });
    DEFPRINT(AST_TemplateString, function(self, output) {
        var is_tagged = output.parent() instanceof AST_PrefixedTemplateString;

        output.print("`");
        for (var i = 0; i < self.segments.length; i++) {
            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
                output.print("${");
                self.segments[i].print(output);
                output.print("}");
            } else if (is_tagged) {
                output.print(self.segments[i].raw);
            } else {
                output.print_template_string_chars(self.segments[i].value);
            }
        }
        output.print("`");
    });
    DEFPRINT(AST_TemplateSegment, function(self, output) {
        output.print_template_string_chars(self.value);
    });

    AST_Arrow.DEFMETHOD("_do_print", function(output) {
        var self = this;
        var parent = output.parent();
        var needs_parens = (parent instanceof AST_Binary && !(parent instanceof AST_Assign)) ||
            parent instanceof AST_Unary ||
            (parent instanceof AST_Call && self === parent.expression);
        if (needs_parens) { output.print("("); }
        if (self.async) {
            output.print("async");
            output.space();
        }
        if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol) {
            self.argnames[0].print(output);
        } else {
            output.with_parens(function() {
                self.argnames.forEach(function(arg, i) {
                    if (i) output.comma();
                    arg.print(output);
                });
            });
        }
        output.space();
        output.print("=>");
        output.space();
        const first_statement = self.body[0];
        if (
            self.body.length === 1
            && first_statement instanceof AST_Return
        ) {
            const returned = first_statement.value;
            if (!returned) {
                output.print("{}");
            } else if (left_is_object(returned)) {
                output.print("(");
                returned.print(output);
                output.print(")");
            } else {
                returned.print(output);
            }
        } else {
            print_braced(self, output);
        }
        if (needs_parens) { output.print(")"); }
        output.gc_scope(self);
    });

    /* -----[ exits ]----- */
    AST_Exit.DEFMETHOD("_do_print", function(output, kind) {
        output.print(kind);
        if (this.value) {
            output.space();
            const comments = this.value.start.comments_before;
            if (comments && comments.length && !output.printed_comments.has(comments)) {
                output.print("(");
                this.value.print(output);
                output.print(")");
            } else {
                this.value.print(output);
            }
        }
        output.semicolon();
    });
    DEFPRINT(AST_Return, function(self, output) {
        self._do_print(output, "return");
    });
    DEFPRINT(AST_Throw, function(self, output) {
        self._do_print(output, "throw");
    });

    /* -----[ yield ]----- */

    DEFPRINT(AST_Yield, function(self, output) {
        var star = self.is_star ? "*" : "";
        output.print("yield" + star);
        if (self.expression) {
            output.space();
            self.expression.print(output);
        }
    });

    DEFPRINT(AST_Await, function(self, output) {
        output.print("await");
        output.space();
        var e = self.expression;
        var parens = !(
               e instanceof AST_Call
            || e instanceof AST_SymbolRef
            || e instanceof AST_PropAccess
            || e instanceof AST_Unary
            || e instanceof AST_Constant
            || e instanceof AST_Await
            || e instanceof AST_Object
        );
        if (parens) output.print("(");
        self.expression.print(output);
        if (parens) output.print(")");
    });

    /* -----[ loop control ]----- */
    AST_LoopControl.DEFMETHOD("_do_print", function(output, kind) {
        output.print(kind);
        if (this.label) {
            output.space();
            this.label.print(output);
        }
        output.semicolon();
    });
    DEFPRINT(AST_Break, function(self, output) {
        self._do_print(output, "break");
    });
    DEFPRINT(AST_Continue, function(self, output) {
        self._do_print(output, "continue");
    });

    /* -----[ if ]----- */
    function make_then(self, output) {
        var b = self.body;
        if (output.option("braces")
            || output.option("ie8") && b instanceof AST_Do)
            return make_block(b, output);
        // The squeezer replaces "block"-s that contain only a single
        // statement with the statement itself; technically, the AST
        // is correct, but this can create problems when we output an
        // IF having an ELSE clause where the THEN clause ends in an
        // IF *without* an ELSE block (then the outer ELSE would refer
        // to the inner IF).  This function checks for this case and
        // adds the block braces if needed.
        if (!b) return output.force_semicolon();
        while (true) {
            if (b instanceof AST_If) {
                if (!b.alternative) {
                    make_block(self.body, output);
                    return;
                }
                b = b.alternative;
            } else if (b instanceof AST_StatementWithBody) {
                b = b.body;
            } else break;
        }
        force_statement(self.body, output);
    }
    DEFPRINT(AST_If, function(self, output) {
        output.print("if");
        output.space();
        output.with_parens(function() {
            self.condition.print(output);
        });
        output.space();
        if (self.alternative) {
            make_then(self, output);
            output.space();
            output.print("else");
            output.space();
            if (self.alternative instanceof AST_If)
                self.alternative.print(output);
            else
                force_statement(self.alternative, output);
        } else {
            self._do_print_body(output);
        }
    });

    /* -----[ switch ]----- */
    DEFPRINT(AST_Switch, function(self, output) {
        output.print("switch");
        output.space();
        output.with_parens(function() {
            self.expression.print(output);
        });
        output.space();
        var last = self.body.length - 1;
        if (last < 0) print_braced_empty(self, output);
        else output.with_block(function() {
            self.body.forEach(function(branch, i) {
                output.indent(true);
                branch.print(output);
                if (i < last && branch.body.length > 0)
                    output.newline();
            });
        });
    });
    AST_SwitchBranch.DEFMETHOD("_do_print_body", function(output) {
        output.newline();
        this.body.forEach(function(stmt) {
            output.indent();
            stmt.print(output);
            output.newline();
        });
    });
    DEFPRINT(AST_Default, function(self, output) {
        output.print("default:");
        self._do_print_body(output);
    });
    DEFPRINT(AST_Case, function(self, output) {
        output.print("case");
        output.space();
        self.expression.print(output);
        output.print(":");
        self._do_print_body(output);
    });

    /* -----[ exceptions ]----- */
    DEFPRINT(AST_Try, function(self, output) {
        output.print("try");
        output.space();
        print_braced(self, output);
        if (self.bcatch) {
            output.space();
            self.bcatch.print(output);
        }
        if (self.bfinally) {
            output.space();
            self.bfinally.print(output);
        }
    });
    DEFPRINT(AST_Catch, function(self, output) {
        output.print("catch");
        if (self.argname) {
            output.space();
            output.with_parens(function() {
                self.argname.print(output);
            });
        }
        output.space();
        print_braced(self, output);
    });
    DEFPRINT(AST_Finally, function(self, output) {
        output.print("finally");
        output.space();
        print_braced(self, output);
    });

    /* -----[ var/const ]----- */
    AST_Definitions.DEFMETHOD("_do_print", function(output, kind) {
        output.print(kind);
        output.space();
        this.definitions.forEach(function(def, i) {
            if (i) output.comma();
            def.print(output);
        });
        var p = output.parent();
        var in_for = p instanceof AST_For || p instanceof AST_ForIn;
        var output_semicolon = !in_for || p && p.init !== this;
        if (output_semicolon)
            output.semicolon();
    });
    DEFPRINT(AST_Let, function(self, output) {
        self._do_print(output, "let");
    });
    DEFPRINT(AST_Var, function(self, output) {
        self._do_print(output, "var");
    });
    DEFPRINT(AST_Const, function(self, output) {
        self._do_print(output, "const");
    });
    DEFPRINT(AST_Import, function(self, output) {
        output.print("import");
        output.space();
        if (self.imported_name) {
            self.imported_name.print(output);
        }
        if (self.imported_name && self.imported_names) {
            output.print(",");
            output.space();
        }
        if (self.imported_names) {
            if (self.imported_names.length === 1 && self.imported_names[0].foreign_name.name === "*") {
                self.imported_names[0].print(output);
            } else {
                output.print("{");
                self.imported_names.forEach(function (name_import, i) {
                    output.space();
                    name_import.print(output);
                    if (i < self.imported_names.length - 1) {
                        output.print(",");
                    }
                });
                output.space();
                output.print("}");
            }
        }
        if (self.imported_name || self.imported_names) {
            output.space();
            output.print("from");
            output.space();
        }
        self.module_name.print(output);
        if (self.assert_clause) {
            output.print("assert");
            self.assert_clause.print(output);
        }
        output.semicolon();
    });
    DEFPRINT(AST_ImportMeta, function(self, output) {
        output.print("import.meta");
    });

    DEFPRINT(AST_NameMapping, function(self, output) {
        var is_import = output.parent() instanceof AST_Import;
        var definition = self.name.definition();
        var names_are_different =
            (definition && definition.mangled_name || self.name.name) !==
            self.foreign_name.name;
        if (names_are_different) {
            if (is_import) {
                output.print(self.foreign_name.name);
            } else {
                self.name.print(output);
            }
            output.space();
            output.print("as");
            output.space();
            if (is_import) {
                self.name.print(output);
            } else {
                output.print(self.foreign_name.name);
            }
        } else {
            self.name.print(output);
        }
    });

    DEFPRINT(AST_Export, function(self, output) {
        output.print("export");
        output.space();
        if (self.is_default) {
            output.print("default");
            output.space();
        }
        if (self.exported_names) {
            if (self.exported_names.length === 1 && self.exported_names[0].name.name === "*") {
                self.exported_names[0].print(output);
            } else {
                output.print("{");
                self.exported_names.forEach(function(name_export, i) {
                    output.space();
                    name_export.print(output);
                    if (i < self.exported_names.length - 1) {
                        output.print(",");
                    }
                });
                output.space();
                output.print("}");
            }
        } else if (self.exported_value) {
            self.exported_value.print(output);
        } else if (self.exported_definition) {
            self.exported_definition.print(output);
            if (self.exported_definition instanceof AST_Definitions) return;
        }
        if (self.module_name) {
            output.space();
            output.print("from");
            output.space();
            self.module_name.print(output);
        }
        if (self.assert_clause) {
            output.print("assert");
            self.assert_clause.print(output);
        }
        if (self.exported_value
                && !(self.exported_value instanceof AST_Defun ||
                    self.exported_value instanceof AST_Function ||
                    self.exported_value instanceof AST_Class)
            || self.module_name
            || self.exported_names
        ) {
            output.semicolon();
        }
    });

    function parenthesize_for_noin(node, output, noin) {
        var parens = false;
        // need to take some precautions here:
        //    https://github.com/mishoo/UglifyJS2/issues/60
        if (noin) {
            parens = walk(node, node => {
                // Don't go into scopes -- except arrow functions:
                // https://github.com/terser/terser/issues/1019#issuecomment-877642607
                if (node instanceof AST_Scope && !(node instanceof AST_Arrow)) {
                    return true;
                }
                if (node instanceof AST_Binary && node.operator == "in") {
                    return walk_abort;  // makes walk() return true
                }
            });
        }
        node.print(output, parens);
    }

    DEFPRINT(AST_VarDef, function(self, output) {
        self.name.print(output);
        if (self.value) {
            output.space();
            output.print("=");
            output.space();
            var p = output.parent(1);
            var noin = p instanceof AST_For || p instanceof AST_ForIn;
            parenthesize_for_noin(self.value, output, noin);
        }
    });

    /* -----[ other expressions ]----- */
    DEFPRINT(AST_Call, function(self, output) {
        self.expression.print(output);
        if (self instanceof AST_New && self.args.length === 0)
            return;
        if (self.expression instanceof AST_Call || self.expression instanceof AST_Lambda) {
            output.add_mapping(self.start);
        }
        if (self.optional) output.print("?.");
        output.with_parens(function() {
            self.args.forEach(function(expr, i) {
                if (i) output.comma();
                expr.print(output);
            });
        });
    });
    DEFPRINT(AST_New, function(self, output) {
        output.print("new");
        output.space();
        AST_Call.prototype._codegen(self, output);
    });

    AST_Sequence.DEFMETHOD("_do_print", function(output) {
        this.expressions.forEach(function(node, index) {
            if (index > 0) {
                output.comma();
                if (output.should_break()) {
                    output.newline();
                    output.indent();
                }
            }
            node.print(output);
        });
    });
    DEFPRINT(AST_Sequence, function(self, output) {
        self._do_print(output);
        // var p = output.parent();
        // if (p instanceof AST_Statement) {
        //     output.with_indent(output.next_indent(), function(){
        //         self._do_print(output);
        //     });
        // } else {
        //     self._do_print(output);
        // }
    });
    DEFPRINT(AST_Dot, function(self, output) {
        var expr = self.expression;
        expr.print(output);
        var prop = self.property;
        var print_computed = ALL_RESERVED_WORDS.has(prop)
            ? output.option("ie8")
            : !is_identifier_string(
                prop,
                output.option("ecma") >= 2015 || output.option("safari10")
            );

        if (self.optional) output.print("?.");

        if (print_computed) {
            output.print("[");
            output.add_mapping(self.end);
            output.print_string(prop);
            output.print("]");
        } else {
            if (expr instanceof AST_Number && expr.getValue() >= 0) {
                if (!/[xa-f.)]/i.test(output.last())) {
                    output.print(".");
                }
            }
            if (!self.optional) output.print(".");
            // the name after dot would be mapped about here.
            output.add_mapping(self.end);
            output.print_name(prop);
        }
    });
    DEFPRINT(AST_DotHash, function(self, output) {
        var expr = self.expression;
        expr.print(output);
        var prop = self.property;

        if (self.optional) output.print("?");
        output.print(".#");
        output.add_mapping(self.end);
        output.print_name(prop);
    });
    DEFPRINT(AST_Sub, function(self, output) {
        self.expression.print(output);
        if (self.optional) output.print("?.");
        output.print("[");
        self.property.print(output);
        output.print("]");
    });
    DEFPRINT(AST_Chain, function(self, output) {
        self.expression.print(output);
    });
    DEFPRINT(AST_UnaryPrefix, function(self, output) {
        var op = self.operator;
        output.print(op);
        if (/^[a-z]/i.test(op)
            || (/[+-]$/.test(op)
                && self.expression instanceof AST_UnaryPrefix
                && /^[+-]/.test(self.expression.operator))) {
            output.space();
        }
        self.expression.print(output);
    });
    DEFPRINT(AST_UnaryPostfix, function(self, output) {
        self.expression.print(output);
        output.print(self.operator);
    });
    DEFPRINT(AST_Binary, function(self, output) {
        var op = self.operator;
        self.left.print(output);
        if (op[0] == ">" /* ">>" ">>>" ">" ">=" */
            && self.left instanceof AST_UnaryPostfix
            && self.left.operator == "--") {
            // space is mandatory to avoid outputting -->
            output.print(" ");
        } else {
            // the space is optional depending on "beautify"
            output.space();
        }
        output.print(op);
        if ((op == "<" || op == "<<")
            && self.right instanceof AST_UnaryPrefix
            && self.right.operator == "!"
            && self.right.expression instanceof AST_UnaryPrefix
            && self.right.expression.operator == "--") {
            // space is mandatory to avoid outputting <!--
            output.print(" ");
        } else {
            // the space is optional depending on "beautify"
            output.space();
        }
        self.right.print(output);
    });
    DEFPRINT(AST_Conditional, function(self, output) {
        self.condition.print(output);
        output.space();
        output.print("?");
        output.space();
        self.consequent.print(output);
        output.space();
        output.colon();
        self.alternative.print(output);
    });

    /* -----[ literals ]----- */
    DEFPRINT(AST_Array, function(self, output) {
        output.with_square(function() {
            var a = self.elements, len = a.length;
            if (len > 0) output.space();
            a.forEach(function(exp, i) {
                if (i) output.comma();
                exp.print(output);
                // If the final element is a hole, we need to make sure it
                // doesn't look like a trailing comma, by inserting an actual
                // trailing comma.
                if (i === len - 1 && exp instanceof AST_Hole)
                  output.comma();
            });
            if (len > 0) output.space();
        });
    });
    DEFPRINT(AST_Object, function(self, output) {
        if (self.properties.length > 0) output.with_block(function() {
            self.properties.forEach(function(prop, i) {
                if (i) {
                    output.print(",");
                    output.newline();
                }
                output.indent();
                prop.print(output);
            });
            output.newline();
        });
        else print_braced_empty(self, output);
    });
    DEFPRINT(AST_Class, function(self, output) {
        output.print("class");
        output.space();
        if (self.name) {
            self.name.print(output);
            output.space();
        }
        if (self.extends) {
            var parens = (
                   !(self.extends instanceof AST_SymbolRef)
                && !(self.extends instanceof AST_PropAccess)
                && !(self.extends instanceof AST_ClassExpression)
                && !(self.extends instanceof AST_Function)
            );
            output.print("extends");
            if (parens) {
                output.print("(");
            } else {
                output.space();
            }
            self.extends.print(output);
            if (parens) {
                output.print(")");
            } else {
                output.space();
            }
        }
        if (self.properties.length > 0) output.with_block(function() {
            self.properties.forEach(function(prop, i) {
                if (i) {
                    output.newline();
                }
                output.indent();
                prop.print(output);
            });
            output.newline();
        });
        else output.print("{}");
    });
    DEFPRINT(AST_NewTarget, function(self, output) {
        output.print("new.target");
    });

    function print_property_name(key, quote, output) {
        if (output.option("quote_keys")) {
            return output.print_string(key);
        }
        if ("" + +key == key && key >= 0) {
            if (output.option("keep_numbers")) {
                return output.print(key);
            }
            return output.print(make_num(key));
        }
        var print_string = ALL_RESERVED_WORDS.has(key)
            ? output.option("ie8")
            : (
                output.option("ecma") < 2015 || output.option("safari10")
                    ? !is_basic_identifier_string(key)
                    : !is_identifier_string(key, true)
            );
        if (print_string || (quote && output.option("keep_quoted_props"))) {
            return output.print_string(key, quote);
        }
        return output.print_name(key);
    }

    DEFPRINT(AST_ObjectKeyVal, function(self, output) {
        function get_name(self) {
            var def = self.definition();
            return def ? def.mangled_name || def.name : self.name;
        }

        var allowShortHand = output.option("shorthand");
        if (allowShortHand &&
            self.value instanceof AST_Symbol &&
            is_identifier_string(
                self.key,
                output.option("ecma") >= 2015 || output.option("safari10")
            ) &&
            get_name(self.value) === self.key &&
            !ALL_RESERVED_WORDS.has(self.key)
        ) {
            print_property_name(self.key, self.quote, output);

        } else if (allowShortHand &&
            self.value instanceof AST_DefaultAssign &&
            self.value.left instanceof AST_Symbol &&
            is_identifier_string(
                self.key,
                output.option("ecma") >= 2015 || output.option("safari10")
            ) &&
            get_name(self.value.left) === self.key
        ) {
            print_property_name(self.key, self.quote, output);
            output.space();
            output.print("=");
            output.space();
            self.value.right.print(output);
        } else {
            if (!(self.key instanceof AST_Node)) {
                print_property_name(self.key, self.quote, output);
            } else {
                output.with_square(function() {
                    self.key.print(output);
                });
            }
            output.colon();
            self.value.print(output);
        }
    });
    DEFPRINT(AST_ClassPrivateProperty, (self, output) => {
        if (self.static) {
            output.print("static");
            output.space();
        }

        output.print("#");
        
        print_property_name(self.key.name, self.quote, output);

        if (self.value) {
            output.print("=");
            self.value.print(output);
        }

        output.semicolon();
    });
    DEFPRINT(AST_ClassProperty, (self, output) => {
        if (self.static) {
            output.print("static");
            output.space();
        }

        if (self.key instanceof AST_SymbolClassProperty) {
            print_property_name(self.key.name, self.quote, output);
        } else {
            output.print("[");
            self.key.print(output);
            output.print("]");
        }

        if (self.value) {
            output.print("=");
            self.value.print(output);
        }

        output.semicolon();
    });
    AST_ObjectProperty.DEFMETHOD("_print_getter_setter", function(type, is_private, output) {
        var self = this;
        if (self.static) {
            output.print("static");
            output.space();
        }
        if (type) {
            output.print(type);
            output.space();
        }
        if (self.key instanceof AST_SymbolMethod) {
            if (is_private) output.print("#");
            print_property_name(self.key.name, self.quote, output);
        } else {
            output.with_square(function() {
                self.key.print(output);
            });
        }
        self.value._do_print(output, true);
    });
    DEFPRINT(AST_ObjectSetter, function(self, output) {
        self._print_getter_setter("set", false, output);
    });
    DEFPRINT(AST_ObjectGetter, function(self, output) {
        self._print_getter_setter("get", false, output);
    });
    DEFPRINT(AST_PrivateSetter, function(self, output) {
        self._print_getter_setter("set", true, output);
    });
    DEFPRINT(AST_PrivateGetter, function(self, output) {
        self._print_getter_setter("get", true, output);
    });
    DEFPRINT(AST_PrivateMethod, function(self, output) {
        var type;
        if (self.is_generator && self.async) {
            type = "async*";
        } else if (self.is_generator) {
            type = "*";
        } else if (self.async) {
            type = "async";
        }
        self._print_getter_setter(type, true, output);
    });
    DEFPRINT(AST_ConciseMethod, function(self, output) {
        var type;
        if (self.is_generator && self.async) {
            type = "async*";
        } else if (self.is_generator) {
            type = "*";
        } else if (self.async) {
            type = "async";
        }
        self._print_getter_setter(type, false, output);
    });
    DEFPRINT(AST_ClassStaticBlock, function (self, output) {
        output.print("static");
        output.space();
        print_braced(self, output);
    });
    AST_Symbol.DEFMETHOD("_do_print", function(output) {
        var def = this.definition();
        output.print_name(def ? def.mangled_name || def.name : this.name);
    });
    DEFPRINT(AST_Symbol, function (self, output) {
        self._do_print(output);
    });
    DEFPRINT(AST_Hole, noop);
    DEFPRINT(AST_This, function(self, output) {
        output.print("this");
    });
    DEFPRINT(AST_Super, function(self, output) {
        output.print("super");
    });
    DEFPRINT(AST_Constant, function(self, output) {
        output.print(self.getValue());
    });
    DEFPRINT(AST_String, function(self, output) {
        output.print_string(self.getValue(), self.quote, output.in_directive);
    });
    DEFPRINT(AST_Number, function(self, output) {
        if ((output.option("keep_numbers") || output.use_asm) && self.raw) {
            output.print(self.raw);
        } else {
            output.print(make_num(self.getValue()));
        }
    });
    DEFPRINT(AST_BigInt, function(self, output) {
        output.print(self.getValue() + "n");
    });

    const r_slash_script = /(<\s*\/\s*script)/i;
    const slash_script_replace = (_, $1) => $1.replace("/", "\\/");
    DEFPRINT(AST_RegExp, function(self, output) {
        let { source, flags } = self.getValue();
        source = regexp_source_fix(source);
        flags = flags ? sort_regexp_flags(flags) : "";
        source = source.replace(r_slash_script, slash_script_replace);

        output.print(output.to_utf8(`/${source}/${flags}`, false, true));

        const parent = output.parent();
        if (
            parent instanceof AST_Binary
            && /^\w/.test(parent.operator)
            && parent.left === self
        ) {
            output.print(" ");
        }
    });

    function force_statement(stat, output) {
        if (output.option("braces")) {
            make_block(stat, output);
        } else {
            if (!stat || stat instanceof AST_EmptyStatement)
                output.force_semicolon();
            else
                stat.print(output);
        }
    }

    function best_of(a) {
        var best = a[0], len = best.length;
        for (var i = 1; i < a.length; ++i) {
            if (a[i].length < len) {
                best = a[i];
                len = best.length;
            }
        }
        return best;
    }

    function make_num(num) {
        var str = num.toString(10).replace(/^0\./, ".").replace("e+", "e");
        var candidates = [ str ];
        if (Math.floor(num) === num) {
            if (num < 0) {
                candidates.push("-0x" + (-num).toString(16).toLowerCase());
            } else {
                candidates.push("0x" + num.toString(16).toLowerCase());
            }
        }
        var match, len, digits;
        if (match = /^\.0+/.exec(str)) {
            len = match[0].length;
            digits = str.slice(len);
            candidates.push(digits + "e-" + (digits.length + len - 1));
        } else if (match = /0+$/.exec(str)) {
            len = match[0].length;
            candidates.push(str.slice(0, -len) + "e" + len);
        } else if (match = /^(\d)\.(\d+)e(-?\d+)$/.exec(str)) {
            candidates.push(match[1] + match[2] + "e" + (match[3] - match[2].length));
        }
        return best_of(candidates);
    }

    function make_block(stmt, output) {
        if (!stmt || stmt instanceof AST_EmptyStatement)
            output.print("{}");
        else if (stmt instanceof AST_BlockStatement)
            stmt.print(output);
        else output.with_block(function() {
            output.indent();
            stmt.print(output);
            output.newline();
        });
    }

    /* -----[ source map generators ]----- */

    function DEFMAP(nodetype, generator) {
        nodetype.forEach(function(nodetype) {
            nodetype.DEFMETHOD("add_source_map", generator);
        });
    }

    DEFMAP([
        // We could easily add info for ALL nodes, but it seems to me that
        // would be quite wasteful, hence this noop in the base class.
        AST_Node,
        // since the label symbol will mark it
        AST_LabeledStatement,
        AST_Toplevel,
    ], noop);

    // XXX: I'm not exactly sure if we need it for all of these nodes,
    // or if we should add even more.
    DEFMAP([
        AST_Array,
        AST_BlockStatement,
        AST_Catch,
        AST_Class,
        AST_Constant,
        AST_Debugger,
        AST_Definitions,
        AST_Directive,
        AST_Finally,
        AST_Jump,
        AST_Lambda,
        AST_New,
        AST_Object,
        AST_StatementWithBody,
        AST_Symbol,
        AST_Switch,
        AST_SwitchBranch,
        AST_TemplateString,
        AST_TemplateSegment,
        AST_Try,
    ], function(output) {
        output.add_mapping(this.start);
    });

    DEFMAP([
        AST_ObjectGetter,
        AST_ObjectSetter,
        AST_PrivateGetter,
        AST_PrivateSetter,
    ], function(output) {
        output.add_mapping(this.key.end, this.key.name);
    });

    DEFMAP([ AST_ObjectProperty ], function(output) {
        output.add_mapping(this.start, this.key);
    });
})();

const shallow_cmp = (node1, node2) => {
    return (
        node1 === null && node2 === null
        || node1.TYPE === node2.TYPE && node1.shallow_cmp(node2)
    );
};

const equivalent_to = (tree1, tree2) => {
    if (!shallow_cmp(tree1, tree2)) return false;
    const walk_1_state = [tree1];
    const walk_2_state = [tree2];

    const walk_1_push = walk_1_state.push.bind(walk_1_state);
    const walk_2_push = walk_2_state.push.bind(walk_2_state);

    while (walk_1_state.length && walk_2_state.length) {
        const node_1 = walk_1_state.pop();
        const node_2 = walk_2_state.pop();

        if (!shallow_cmp(node_1, node_2)) return false;

        node_1._children_backwards(walk_1_push);
        node_2._children_backwards(walk_2_push);

        if (walk_1_state.length !== walk_2_state.length) {
            // Different number of children
            return false;
        }
    }

    return walk_1_state.length == 0 && walk_2_state.length == 0;
};

const pass_through = () => true;

AST_Node.prototype.shallow_cmp = function () {
    throw new Error("did not find a shallow_cmp function for " + this.constructor.name);
};

AST_Debugger.prototype.shallow_cmp = pass_through;

AST_Directive.prototype.shallow_cmp = function(other) {
    return this.value === other.value;
};

AST_SimpleStatement.prototype.shallow_cmp = pass_through;

AST_Block.prototype.shallow_cmp = pass_through;

AST_EmptyStatement.prototype.shallow_cmp = pass_through;

AST_LabeledStatement.prototype.shallow_cmp = function(other) {
    return this.label.name === other.label.name;
};

AST_Do.prototype.shallow_cmp = pass_through;

AST_While.prototype.shallow_cmp = pass_through;

AST_For.prototype.shallow_cmp = function(other) {
    return (this.init == null ? other.init == null : this.init === other.init) && (this.condition == null ? other.condition == null : this.condition === other.condition) && (this.step == null ? other.step == null : this.step === other.step);
};

AST_ForIn.prototype.shallow_cmp = pass_through;

AST_ForOf.prototype.shallow_cmp = pass_through;

AST_With.prototype.shallow_cmp = pass_through;

AST_Toplevel.prototype.shallow_cmp = pass_through;

AST_Expansion.prototype.shallow_cmp = pass_through;

AST_Lambda.prototype.shallow_cmp = function(other) {
    return this.is_generator === other.is_generator && this.async === other.async;
};

AST_Destructuring.prototype.shallow_cmp = function(other) {
    return this.is_array === other.is_array;
};

AST_PrefixedTemplateString.prototype.shallow_cmp = pass_through;

AST_TemplateString.prototype.shallow_cmp = pass_through;

AST_TemplateSegment.prototype.shallow_cmp = function(other) {
    return this.value === other.value;
};

AST_Jump.prototype.shallow_cmp = pass_through;

AST_LoopControl.prototype.shallow_cmp = pass_through;

AST_Await.prototype.shallow_cmp = pass_through;

AST_Yield.prototype.shallow_cmp = function(other) {
    return this.is_star === other.is_star;
};

AST_If.prototype.shallow_cmp = function(other) {
    return this.alternative == null ? other.alternative == null : this.alternative === other.alternative;
};

AST_Switch.prototype.shallow_cmp = pass_through;

AST_SwitchBranch.prototype.shallow_cmp = pass_through;

AST_Try.prototype.shallow_cmp = function(other) {
    return (this.bcatch == null ? other.bcatch == null : this.bcatch === other.bcatch) && (this.bfinally == null ? other.bfinally == null : this.bfinally === other.bfinally);
};

AST_Catch.prototype.shallow_cmp = function(other) {
    return this.argname == null ? other.argname == null : this.argname === other.argname;
};

AST_Finally.prototype.shallow_cmp = pass_through;

AST_Definitions.prototype.shallow_cmp = pass_through;

AST_VarDef.prototype.shallow_cmp = function(other) {
    return this.value == null ? other.value == null : this.value === other.value;
};

AST_NameMapping.prototype.shallow_cmp = pass_through;

AST_Import.prototype.shallow_cmp = function(other) {
    return (this.imported_name == null ? other.imported_name == null : this.imported_name === other.imported_name) && (this.imported_names == null ? other.imported_names == null : this.imported_names === other.imported_names);
};

AST_ImportMeta.prototype.shallow_cmp = pass_through;

AST_Export.prototype.shallow_cmp = function(other) {
    return (this.exported_definition == null ? other.exported_definition == null : this.exported_definition === other.exported_definition) && (this.exported_value == null ? other.exported_value == null : this.exported_value === other.exported_value) && (this.exported_names == null ? other.exported_names == null : this.exported_names === other.exported_names) && this.module_name === other.module_name && this.is_default === other.is_default;
};

AST_Call.prototype.shallow_cmp = pass_through;

AST_Sequence.prototype.shallow_cmp = pass_through;

AST_PropAccess.prototype.shallow_cmp = pass_through;

AST_Chain.prototype.shallow_cmp = pass_through;

AST_Dot.prototype.shallow_cmp = function(other) {
    return this.property === other.property;
};

AST_DotHash.prototype.shallow_cmp = function(other) {
    return this.property === other.property;
};

AST_Unary.prototype.shallow_cmp = function(other) {
    return this.operator === other.operator;
};

AST_Binary.prototype.shallow_cmp = function(other) {
    return this.operator === other.operator;
};

AST_Conditional.prototype.shallow_cmp = pass_through;

AST_Array.prototype.shallow_cmp = pass_through;

AST_Object.prototype.shallow_cmp = pass_through;

AST_ObjectProperty.prototype.shallow_cmp = pass_through;

AST_ObjectKeyVal.prototype.shallow_cmp = function(other) {
    return this.key === other.key;
};

AST_ObjectSetter.prototype.shallow_cmp = function(other) {
    return this.static === other.static;
};

AST_ObjectGetter.prototype.shallow_cmp = function(other) {
    return this.static === other.static;
};

AST_ConciseMethod.prototype.shallow_cmp = function(other) {
    return this.static === other.static && this.is_generator === other.is_generator && this.async === other.async;
};

AST_Class.prototype.shallow_cmp = function(other) {
    return (this.name == null ? other.name == null : this.name === other.name) && (this.extends == null ? other.extends == null : this.extends === other.extends);
};

AST_ClassProperty.prototype.shallow_cmp = function(other) {
    return this.static === other.static;
};

AST_Symbol.prototype.shallow_cmp = function(other) {
    return this.name === other.name;
};

AST_NewTarget.prototype.shallow_cmp = pass_through;

AST_This.prototype.shallow_cmp = pass_through;

AST_Super.prototype.shallow_cmp = pass_through;

AST_String.prototype.shallow_cmp = function(other) {
    return this.value === other.value;
};

AST_Number.prototype.shallow_cmp = function(other) {
    return this.value === other.value;
};

AST_BigInt.prototype.shallow_cmp = function(other) {
    return this.value === other.value;
};

AST_RegExp.prototype.shallow_cmp = function (other) {
    return (
        this.value.flags === other.value.flags
        && this.value.source === other.value.source
    );
};

AST_Atom.prototype.shallow_cmp = pass_through;

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

const MASK_EXPORT_DONT_MANGLE = 1 << 0;
const MASK_EXPORT_WANT_MANGLE = 1 << 1;

let function_defs = null;
let unmangleable_names = null;
/**
 * When defined, there is a function declaration somewhere that's inside of a block.
 * See https://tc39.es/ecma262/multipage/additional-ecmascript-features-for-web-browsers.html#sec-block-level-function-declarations-web-legacy-compatibility-semantics
*/
let scopes_with_block_defuns = null;

class SymbolDef {
    constructor(scope, orig, init) {
        this.name = orig.name;
        this.orig = [ orig ];
        this.init = init;
        this.eliminated = 0;
        this.assignments = 0;
        this.scope = scope;
        this.replaced = 0;
        this.global = false;
        this.export = 0;
        this.mangled_name = null;
        this.undeclared = false;
        this.id = SymbolDef.next_id++;
        this.chained = false;
        this.direct_access = false;
        this.escaped = 0;
        this.recursive_refs = 0;
        this.references = [];
        this.should_replace = undefined;
        this.single_use = false;
        this.fixed = false;
        Object.seal(this);
    }
    fixed_value() {
        if (!this.fixed || this.fixed instanceof AST_Node) return this.fixed;
        return this.fixed();
    }
    unmangleable(options) {
        if (!options) options = {};

        if (
            function_defs &&
            function_defs.has(this.id) &&
            keep_name(options.keep_fnames, this.orig[0].name)
        ) return true;

        return this.global && !options.toplevel
            || (this.export & MASK_EXPORT_DONT_MANGLE)
            || this.undeclared
            || !options.eval && this.scope.pinned()
            || (this.orig[0] instanceof AST_SymbolLambda
                  || this.orig[0] instanceof AST_SymbolDefun) && keep_name(options.keep_fnames, this.orig[0].name)
            || this.orig[0] instanceof AST_SymbolMethod
            || (this.orig[0] instanceof AST_SymbolClass
                  || this.orig[0] instanceof AST_SymbolDefClass) && keep_name(options.keep_classnames, this.orig[0].name);
    }
    mangle(options) {
        const cache = options.cache && options.cache.props;
        if (this.global && cache && cache.has(this.name)) {
            this.mangled_name = cache.get(this.name);
        } else if (!this.mangled_name && !this.unmangleable(options)) {
            var s = this.scope;
            var sym = this.orig[0];
            if (options.ie8 && sym instanceof AST_SymbolLambda)
                s = s.parent_scope;
            const redefinition = redefined_catch_def(this);
            this.mangled_name = redefinition
                ? redefinition.mangled_name || redefinition.name
                : s.next_mangled(options, this);
            if (this.global && cache) {
                cache.set(this.name, this.mangled_name);
            }
        }
    }
}

SymbolDef.next_id = 1;

function redefined_catch_def(def) {
    if (def.orig[0] instanceof AST_SymbolCatch
        && def.scope.is_block_scope()
    ) {
        return def.scope.get_defun_scope().variables.get(def.name);
    }
}

AST_Scope.DEFMETHOD("figure_out_scope", function(options, { parent_scope = null, toplevel = this } = {}) {
    options = defaults(options, {
        cache: null,
        ie8: false,
        safari10: false,
    });

    if (!(toplevel instanceof AST_Toplevel)) {
        throw new Error("Invalid toplevel scope");
    }

    // pass 1: setup scope chaining and handle definitions
    var scope = this.parent_scope = parent_scope;
    var labels = new Map();
    var defun = null;
    var in_destructuring = null;
    var for_scopes = [];
    var tw = new TreeWalker((node, descend) => {
        if (node.is_block_scope()) {
            const save_scope = scope;
            node.block_scope = scope = new AST_Scope(node);
            scope._block_scope = true;
            // AST_Try in the AST sadly *is* (not has) a body itself,
            // and its catch and finally branches are children of the AST_Try itself
            const parent_scope = node instanceof AST_Catch
                ? save_scope.parent_scope
                : save_scope;
            scope.init_scope_vars(parent_scope);
            scope.uses_with = save_scope.uses_with;
            scope.uses_eval = save_scope.uses_eval;
            if (options.safari10) {
                if (node instanceof AST_For || node instanceof AST_ForIn) {
                    for_scopes.push(scope);
                }
            }

            if (node instanceof AST_Switch) {
                // XXX: HACK! Ensure the switch expression gets the correct scope (the parent scope) and the body gets the contained scope
                // AST_Switch has a scope within the body, but it itself "is a block scope"
                // This means the switched expression has to belong to the outer scope
                // while the body inside belongs to the switch itself.
                // This is pretty nasty and warrants an AST change similar to AST_Try (read above)
                const the_block_scope = scope;
                scope = save_scope;
                node.expression.walk(tw);
                scope = the_block_scope;
                for (let i = 0; i < node.body.length; i++) {
                    node.body[i].walk(tw);
                }
            } else {
                descend();
            }
            scope = save_scope;
            return true;
        }
        if (node instanceof AST_Destructuring) {
            const save_destructuring = in_destructuring;
            in_destructuring = node;
            descend();
            in_destructuring = save_destructuring;
            return true;
        }
        if (node instanceof AST_Scope) {
            node.init_scope_vars(scope);
            var save_scope = scope;
            var save_defun = defun;
            var save_labels = labels;
            defun = scope = node;
            labels = new Map();
            descend();
            scope = save_scope;
            defun = save_defun;
            labels = save_labels;
            return true;        // don't descend again in TreeWalker
        }
        if (node instanceof AST_LabeledStatement) {
            var l = node.label;
            if (labels.has(l.name)) {
                throw new Error(string_template("Label {name} defined twice", l));
            }
            labels.set(l.name, l);
            descend();
            labels.delete(l.name);
            return true;        // no descend again
        }
        if (node instanceof AST_With) {
            for (var s = scope; s; s = s.parent_scope)
                s.uses_with = true;
            return;
        }
        if (node instanceof AST_Symbol) {
            node.scope = scope;
        }
        if (node instanceof AST_Label) {
            node.thedef = node;
            node.references = [];
        }
        if (node instanceof AST_SymbolLambda) {
            defun.def_function(node, node.name == "arguments" ? undefined : defun);
        } else if (node instanceof AST_SymbolDefun) {
            // Careful here, the scope where this should be defined is
            // the parent scope.  The reason is that we enter a new
            // scope when we encounter the AST_Defun node (which is
            // instanceof AST_Scope) but we get to the symbol a bit
            // later.
            const closest_scope = defun.parent_scope;

            // In strict mode, function definitions are block-scoped
            node.scope = tw.directives["use strict"]
                ? closest_scope
                : closest_scope.get_defun_scope();

            mark_export(node.scope.def_function(node, defun), 1);
        } else if (node instanceof AST_SymbolClass) {
            mark_export(defun.def_variable(node, defun), 1);
        } else if (node instanceof AST_SymbolImport) {
            scope.def_variable(node);
        } else if (node instanceof AST_SymbolDefClass) {
            // This deals with the name of the class being available
            // inside the class.
            mark_export((node.scope = defun.parent_scope).def_function(node, defun), 1);
        } else if (
            node instanceof AST_SymbolVar
            || node instanceof AST_SymbolLet
            || node instanceof AST_SymbolConst
            || node instanceof AST_SymbolCatch
        ) {
            var def;
            if (node instanceof AST_SymbolBlockDeclaration) {
                def = scope.def_variable(node, null);
            } else {
                def = defun.def_variable(node, node.TYPE == "SymbolVar" ? null : undefined);
            }
            if (!def.orig.every((sym) => {
                if (sym === node) return true;
                if (node instanceof AST_SymbolBlockDeclaration) {
                    return sym instanceof AST_SymbolLambda;
                }
                return !(sym instanceof AST_SymbolLet || sym instanceof AST_SymbolConst);
            })) {
                js_error(
                    `"${node.name}" is redeclared`,
                    node.start.file,
                    node.start.line,
                    node.start.col,
                    node.start.pos
                );
            }
            if (!(node instanceof AST_SymbolFunarg)) mark_export(def, 2);
            if (defun !== scope) {
                node.mark_enclosed();
                var def = scope.find_variable(node);
                if (node.thedef !== def) {
                    node.thedef = def;
                    node.reference();
                }
            }
        } else if (node instanceof AST_LabelRef) {
            var sym = labels.get(node.name);
            if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
                name: node.name,
                line: node.start.line,
                col: node.start.col
            }));
            node.thedef = sym;
        }
        if (!(scope instanceof AST_Toplevel) && (node instanceof AST_Export || node instanceof AST_Import)) {
            js_error(
                `"${node.TYPE}" statement may only appear at the top level`,
                node.start.file,
                node.start.line,
                node.start.col,
                node.start.pos
            );
        }
    });
    this.walk(tw);

    function mark_export(def, level) {
        if (in_destructuring) {
            var i = 0;
            do {
                level++;
            } while (tw.parent(i++) !== in_destructuring);
        }
        var node = tw.parent(level);
        if (def.export = node instanceof AST_Export ? MASK_EXPORT_DONT_MANGLE : 0) {
            var exported = node.exported_definition;
            if ((exported instanceof AST_Defun || exported instanceof AST_DefClass) && node.is_default) {
                def.export = MASK_EXPORT_WANT_MANGLE;
            }
        }
    }

    // pass 2: find back references and eval
    const is_toplevel = this instanceof AST_Toplevel;
    if (is_toplevel) {
        this.globals = new Map();
    }

    var tw = new TreeWalker(node => {
        if (node instanceof AST_LoopControl && node.label) {
            node.label.thedef.references.push(node);
            return true;
        }
        if (node instanceof AST_SymbolRef) {
            var name = node.name;
            if (name == "eval" && tw.parent() instanceof AST_Call) {
                for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
                    s.uses_eval = true;
                }
            }
            var sym;
            if (tw.parent() instanceof AST_NameMapping && tw.parent(1).module_name
                || !(sym = node.scope.find_variable(name))) {

                sym = toplevel.def_global(node);
                if (node instanceof AST_SymbolExport) sym.export = MASK_EXPORT_DONT_MANGLE;
            } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
                sym.scope.uses_arguments = true;
            }
            node.thedef = sym;
            node.reference();
            if (node.scope.is_block_scope()
                && !(sym.orig[0] instanceof AST_SymbolBlockDeclaration)) {
                node.scope = node.scope.get_defun_scope();
            }
            return true;
        }
        // ensure mangling works if catch reuses a scope variable
        var def;
        if (node instanceof AST_SymbolCatch && (def = redefined_catch_def(node.definition()))) {
            var s = node.scope;
            while (s) {
                push_uniq(s.enclosed, def);
                if (s === def.scope) break;
                s = s.parent_scope;
            }
        }
    });
    this.walk(tw);

    // pass 3: work around IE8 and Safari catch scope bugs
    if (options.ie8 || options.safari10) {
        walk(this, node => {
            if (node instanceof AST_SymbolCatch) {
                var name = node.name;
                var refs = node.thedef.references;
                var scope = node.scope.get_defun_scope();
                var def = scope.find_variable(name)
                    || toplevel.globals.get(name)
                    || scope.def_variable(node);
                refs.forEach(function(ref) {
                    ref.thedef = def;
                    ref.reference();
                });
                node.thedef = def;
                node.reference();
                return true;
            }
        });
    }

    // pass 4: add symbol definitions to loop scopes
    // Safari/Webkit bug workaround - loop init let variable shadowing argument.
    // https://github.com/mishoo/UglifyJS2/issues/1753
    // https://bugs.webkit.org/show_bug.cgi?id=171041
    if (options.safari10) {
        for (const scope of for_scopes) {
            scope.parent_scope.variables.forEach(function(def) {
                push_uniq(scope.enclosed, def);
            });
        }
    }
});

AST_Toplevel.DEFMETHOD("def_global", function(node) {
    var globals = this.globals, name = node.name;
    if (globals.has(name)) {
        return globals.get(name);
    } else {
        var g = new SymbolDef(this, node);
        g.undeclared = true;
        g.global = true;
        globals.set(name, g);
        return g;
    }
});

AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope) {
    this.variables = new Map();         // map name to AST_SymbolVar (variables defined in this scope; includes functions)
    this.uses_with = false;             // will be set to true if this or some nested scope uses the `with` statement
    this.uses_eval = false;             // will be set to true if this or nested scope uses the global `eval`
    this.parent_scope = parent_scope;   // the parent scope
    this.enclosed = [];                 // a list of variables from this or outer scope(s) that are referenced from this or inner scopes
    this.cname = -1;                    // the current index for mangling functions/variables
});

AST_Scope.DEFMETHOD("conflicting_def", function (name) {
    return (
        this.enclosed.find(def => def.name === name)
        || this.variables.has(name)
        || (this.parent_scope && this.parent_scope.conflicting_def(name))
    );
});

AST_Scope.DEFMETHOD("conflicting_def_shallow", function (name) {
    return (
        this.enclosed.find(def => def.name === name)
        || this.variables.has(name)
    );
});

AST_Scope.DEFMETHOD("add_child_scope", function (scope) {
    // `scope` is going to be moved into `this` right now.
    // Update the required scopes' information

    if (scope.parent_scope === this) return;

    scope.parent_scope = this;

    // TODO uses_with, uses_eval, etc

    const scope_ancestry = (() => {
        const ancestry = [];
        let cur = this;
        do {
            ancestry.push(cur);
        } while ((cur = cur.parent_scope));
        ancestry.reverse();
        return ancestry;
    })();

    const new_scope_enclosed_set = new Set(scope.enclosed);
    const to_enclose = [];
    for (const scope_topdown of scope_ancestry) {
        to_enclose.forEach(e => push_uniq(scope_topdown.enclosed, e));
        for (const def of scope_topdown.variables.values()) {
            if (new_scope_enclosed_set.has(def)) {
                push_uniq(to_enclose, def);
                push_uniq(scope_topdown.enclosed, def);
            }
        }
    }
});

function find_scopes_visible_from(scopes) {
    const found_scopes = new Set();

    for (const scope of new Set(scopes)) {
        (function bubble_up(scope) {
            if (scope == null || found_scopes.has(scope)) return;

            found_scopes.add(scope);

            bubble_up(scope.parent_scope);
        })(scope);
    }

    return [...found_scopes];
}

// Creates a symbol during compression
AST_Scope.DEFMETHOD("create_symbol", function(SymClass, {
    source,
    tentative_name,
    scope,
    conflict_scopes = [scope],
    init = null
} = {}) {
    let symbol_name;

    conflict_scopes = find_scopes_visible_from(conflict_scopes);

    if (tentative_name) {
        // Implement hygiene (no new names are conflicting with existing names)
        tentative_name =
            symbol_name =
            tentative_name.replace(/(?:^[^a-z_$]|[^a-z0-9_$])/ig, "_");

        let i = 0;
        while (conflict_scopes.find(s => s.conflicting_def_shallow(symbol_name))) {
            symbol_name = tentative_name + "$" + i++;
        }
    }

    if (!symbol_name) {
        throw new Error("No symbol name could be generated in create_symbol()");
    }

    const symbol = make_node(SymClass, source, {
        name: symbol_name,
        scope
    });

    this.def_variable(symbol, init || null);

    symbol.mark_enclosed();

    return symbol;
});


AST_Node.DEFMETHOD("is_block_scope", return_false);
AST_Class.DEFMETHOD("is_block_scope", return_false);
AST_Lambda.DEFMETHOD("is_block_scope", return_false);
AST_Toplevel.DEFMETHOD("is_block_scope", return_false);
AST_SwitchBranch.DEFMETHOD("is_block_scope", return_false);
AST_Block.DEFMETHOD("is_block_scope", return_true);
AST_Scope.DEFMETHOD("is_block_scope", function () {
    return this._block_scope || false;
});
AST_IterationStatement.DEFMETHOD("is_block_scope", return_true);

AST_Lambda.DEFMETHOD("init_scope_vars", function() {
    AST_Scope.prototype.init_scope_vars.apply(this, arguments);
    this.uses_arguments = false;
    this.def_variable(new AST_SymbolFunarg({
        name: "arguments",
        start: this.start,
        end: this.end
    }));
});

AST_Arrow.DEFMETHOD("init_scope_vars", function() {
    AST_Scope.prototype.init_scope_vars.apply(this, arguments);
    this.uses_arguments = false;
});

AST_Symbol.DEFMETHOD("mark_enclosed", function() {
    var def = this.definition();
    var s = this.scope;
    while (s) {
        push_uniq(s.enclosed, def);
        if (s === def.scope) break;
        s = s.parent_scope;
    }
});

AST_Symbol.DEFMETHOD("reference", function() {
    this.definition().references.push(this);
    this.mark_enclosed();
});

AST_Scope.DEFMETHOD("find_variable", function(name) {
    if (name instanceof AST_Symbol) name = name.name;
    return this.variables.get(name)
        || (this.parent_scope && this.parent_scope.find_variable(name));
});

AST_Scope.DEFMETHOD("def_function", function(symbol, init) {
    var def = this.def_variable(symbol, init);
    if (!def.init || def.init instanceof AST_Defun) def.init = init;
    return def;
});

AST_Scope.DEFMETHOD("def_variable", function(symbol, init) {
    var def = this.variables.get(symbol.name);
    if (def) {
        def.orig.push(symbol);
        if (def.init && (def.scope !== symbol.scope || def.init instanceof AST_Function)) {
            def.init = init;
        }
    } else {
        def = new SymbolDef(this, symbol, init);
        this.variables.set(symbol.name, def);
        def.global = !this.parent_scope;
    }
    return symbol.thedef = def;
});

function next_mangled(scope, options) {
    let defun_scope;
    if (
        scopes_with_block_defuns
        && (defun_scope = scope.get_defun_scope())
        && scopes_with_block_defuns.has(defun_scope)
    ) {
        scope = defun_scope;
    }

    var ext = scope.enclosed;
    var nth_identifier = options.nth_identifier;
    out: while (true) {
        var m = nth_identifier.get(++scope.cname);
        if (ALL_RESERVED_WORDS.has(m)) continue; // skip over "do"

        // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
        // shadow a name reserved from mangling.
        if (options.reserved.has(m)) continue;

        // Functions with short names might collide with base54 output
        // and therefore cause collisions when keep_fnames is true.
        if (unmangleable_names && unmangleable_names.has(m)) continue out;

        // we must ensure that the mangled name does not shadow a name
        // from some parent scope that is referenced in this or in
        // inner scopes.
        for (let i = ext.length; --i >= 0;) {
            const def = ext[i];
            const name = def.mangled_name || (def.unmangleable(options) && def.name);
            if (m == name) continue out;
        }
        return m;
    }
}

AST_Scope.DEFMETHOD("next_mangled", function(options) {
    return next_mangled(this, options);
});

AST_Toplevel.DEFMETHOD("next_mangled", function(options) {
    let name;
    const mangled_names = this.mangled_names;
    do {
        name = next_mangled(this, options);
    } while (mangled_names.has(name));
    return name;
});

AST_Function.DEFMETHOD("next_mangled", function(options, def) {
    // #179, #326
    // in Safari strict mode, something like (function x(x){...}) is a syntax error;
    // a function expression's argument cannot shadow the function expression's name

    var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();

    // the function's mangled_name is null when keep_fnames is true
    var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;

    while (true) {
        var name = next_mangled(this, options);
        if (!tricky_name || tricky_name != name)
            return name;
    }
});

AST_Symbol.DEFMETHOD("unmangleable", function(options) {
    var def = this.definition();
    return !def || def.unmangleable(options);
});

// labels are always mangleable
AST_Label.DEFMETHOD("unmangleable", return_false);

AST_Symbol.DEFMETHOD("unreferenced", function() {
    return !this.definition().references.length && !this.scope.pinned();
});

AST_Symbol.DEFMETHOD("definition", function() {
    return this.thedef;
});

AST_Symbol.DEFMETHOD("global", function() {
    return this.thedef.global;
});

AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
    options = defaults(options, {
        eval        : false,
        nth_identifier : base54,
        ie8         : false,
        keep_classnames: false,
        keep_fnames : false,
        module      : false,
        reserved    : [],
        toplevel    : false,
    });
    if (options.module) options.toplevel = true;
    if (!Array.isArray(options.reserved)
        && !(options.reserved instanceof Set)
    ) {
        options.reserved = [];
    }
    options.reserved = new Set(options.reserved);
    // Never mangle arguments
    options.reserved.add("arguments");
    return options;
});

AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
    options = this._default_mangler_options(options);
    var nth_identifier = options.nth_identifier;

    // We only need to mangle declaration nodes.  Special logic wired
    // into the code generator will display the mangled name if it's
    // present (and for AST_SymbolRef-s it'll use the mangled name of
    // the AST_SymbolDeclaration that it points to).
    var lname = -1;
    var to_mangle = [];

    if (options.keep_fnames) {
        function_defs = new Set();
    }

    const mangled_names = this.mangled_names = new Set();
    unmangleable_names = new Set();

    if (options.cache) {
        this.globals.forEach(collect);
        if (options.cache.props) {
            options.cache.props.forEach(function(mangled_name) {
                mangled_names.add(mangled_name);
            });
        }
    }

    var tw = new TreeWalker(function(node, descend) {
        if (node instanceof AST_LabeledStatement) {
            // lname is incremented when we get to the AST_Label
            var save_nesting = lname;
            descend();
            lname = save_nesting;
            return true;        // don't descend again in TreeWalker
        }
        if (
            node instanceof AST_Defun
            && !(tw.parent() instanceof AST_Scope)
        ) {
            scopes_with_block_defuns = scopes_with_block_defuns || new Set();
            scopes_with_block_defuns.add(node.parent_scope.get_defun_scope());
        }
        if (node instanceof AST_Scope) {
            node.variables.forEach(collect);
            return;
        }
        if (node.is_block_scope()) {
            node.block_scope.variables.forEach(collect);
            return;
        }
        if (
            function_defs
            && node instanceof AST_VarDef
            && node.value instanceof AST_Lambda
            && !node.value.name
            && keep_name(options.keep_fnames, node.name.name)
        ) {
            function_defs.add(node.name.definition().id);
            return;
        }
        if (node instanceof AST_Label) {
            let name;
            do {
                name = nth_identifier.get(++lname);
            } while (ALL_RESERVED_WORDS.has(name));
            node.mangled_name = name;
            return true;
        }
        if (!(options.ie8 || options.safari10) && node instanceof AST_SymbolCatch) {
            to_mangle.push(node.definition());
            return;
        }
    });

    this.walk(tw);

    if (options.keep_fnames || options.keep_classnames) {
        // Collect a set of short names which are unmangleable,
        // for use in avoiding collisions in next_mangled.
        to_mangle.forEach(def => {
            if (def.name.length < 6 && def.unmangleable(options)) {
                unmangleable_names.add(def.name);
            }
        });
    }

    to_mangle.forEach(def => { def.mangle(options); });

    function_defs = null;
    unmangleable_names = null;
    scopes_with_block_defuns = null;

    function collect(symbol) {
        if (symbol.export & MASK_EXPORT_DONT_MANGLE) {
            unmangleable_names.add(symbol.name);
        } else if (!options.reserved.has(symbol.name)) {
            to_mangle.push(symbol);
        }
    }
});

AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
    const cache = options.cache && options.cache.props;
    const avoid = new Set();
    options.reserved.forEach(to_avoid);
    this.globals.forEach(add_def);
    this.walk(new TreeWalker(function(node) {
        if (node instanceof AST_Scope) node.variables.forEach(add_def);
        if (node instanceof AST_SymbolCatch) add_def(node.definition());
    }));
    return avoid;

    function to_avoid(name) {
        avoid.add(name);
    }

    function add_def(def) {
        var name = def.name;
        if (def.global && cache && cache.has(name)) name = cache.get(name);
        else if (!def.unmangleable(options)) return;
        to_avoid(name);
    }
});

AST_Toplevel.DEFMETHOD("expand_names", function(options) {
    options = this._default_mangler_options(options);
    var nth_identifier = options.nth_identifier;
    if (nth_identifier.reset && nth_identifier.sort) {
        nth_identifier.reset();
        nth_identifier.sort();
    }
    var avoid = this.find_colliding_names(options);
    var cname = 0;
    this.globals.forEach(rename);
    this.walk(new TreeWalker(function(node) {
        if (node instanceof AST_Scope) node.variables.forEach(rename);
        if (node instanceof AST_SymbolCatch) rename(node.definition());
    }));

    function next_name() {
        var name;
        do {
            name = nth_identifier.get(cname++);
        } while (avoid.has(name) || ALL_RESERVED_WORDS.has(name));
        return name;
    }

    function rename(def) {
        if (def.global && options.cache) return;
        if (def.unmangleable(options)) return;
        if (options.reserved.has(def.name)) return;
        const redefinition = redefined_catch_def(def);
        const name = def.name = redefinition ? redefinition.name : next_name();
        def.orig.forEach(function(sym) {
            sym.name = name;
        });
        def.references.forEach(function(sym) {
            sym.name = name;
        });
    }
});

AST_Node.DEFMETHOD("tail_node", return_this);
AST_Sequence.DEFMETHOD("tail_node", function() {
    return this.expressions[this.expressions.length - 1];
});

AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options) {
    options = this._default_mangler_options(options);
    var nth_identifier = options.nth_identifier;
    if (!nth_identifier.reset || !nth_identifier.consider || !nth_identifier.sort) {
        // If the identifier mangler is invariant, skip computing character frequency.
        return;
    }
    nth_identifier.reset();

    try {
        AST_Node.prototype.print = function(stream, force_parens) {
            this._print(stream, force_parens);
            if (this instanceof AST_Symbol && !this.unmangleable(options)) {
                nth_identifier.consider(this.name, -1);
            } else if (options.properties) {
                if (this instanceof AST_DotHash) {
                    nth_identifier.consider("#" + this.property, -1);
                } else if (this instanceof AST_Dot) {
                    nth_identifier.consider(this.property, -1);
                } else if (this instanceof AST_Sub) {
                    skip_string(this.property);
                }
            }
        };
        nth_identifier.consider(this.print_to_string(), 1);
    } finally {
        AST_Node.prototype.print = AST_Node.prototype._print;
    }
    nth_identifier.sort();

    function skip_string(node) {
        if (node instanceof AST_String) {
            nth_identifier.consider(node.value, -1);
        } else if (node instanceof AST_Conditional) {
            skip_string(node.consequent);
            skip_string(node.alternative);
        } else if (node instanceof AST_Sequence) {
            skip_string(node.tail_node());
        }
    }
});

const base54 = (() => {
    const leading = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_".split("");
    const digits = "0123456789".split("");
    let chars;
    let frequency;
    function reset() {
        frequency = new Map();
        leading.forEach(function(ch) {
            frequency.set(ch, 0);
        });
        digits.forEach(function(ch) {
            frequency.set(ch, 0);
        });
    }
    function consider(str, delta) {
        for (var i = str.length; --i >= 0;) {
            frequency.set(str[i], frequency.get(str[i]) + delta);
        }
    }
    function compare(a, b) {
        return frequency.get(b) - frequency.get(a);
    }
    function sort() {
        chars = mergeSort(leading, compare).concat(mergeSort(digits, compare));
    }
    // Ensure this is in a usable initial state.
    reset();
    sort();
    function base54(num) {
        var ret = "", base = 54;
        num++;
        do {
            num--;
            ret += chars[num % base];
            num = Math.floor(num / base);
            base = 64;
        } while (num > 0);
        return ret;
    }

    return {
        get: base54,
        consider,
        reset,
        sort
    };
})();

let mangle_options = undefined;
AST_Node.prototype.size = function (compressor, stack) {
    mangle_options = compressor && compressor.mangle_options;

    let size = 0;
    walk_parent(this, (node, info) => {
        size += node._size(info);

        // Braceless arrow functions have fake "return" statements
        if (node instanceof AST_Arrow && node.is_braceless()) {
            size += node.body[0].value._size(info);
            return true;
        }
    }, stack || (compressor && compressor.stack));

    // just to save a bit of memory
    mangle_options = undefined;

    return size;
};

AST_Node.prototype._size = () => 0;

AST_Debugger.prototype._size = () => 8;

AST_Directive.prototype._size = function () {
    // TODO string encoding stuff
    return 2 + this.value.length;
};

/** Count commas/semicolons necessary to show a list of expressions/statements */
const list_overhead = (array) => array.length && array.length - 1;

AST_Block.prototype._size = function () {
    return 2 + list_overhead(this.body);
};

AST_Toplevel.prototype._size = function() {
    return list_overhead(this.body);
};

AST_EmptyStatement.prototype._size = () => 1;

AST_LabeledStatement.prototype._size = () => 2;  // x:

AST_Do.prototype._size = () => 9;

AST_While.prototype._size = () => 7;

AST_For.prototype._size = () => 8;

AST_ForIn.prototype._size = () => 8;
// AST_ForOf inherits ^

AST_With.prototype._size = () => 6;

AST_Expansion.prototype._size = () => 3;

const lambda_modifiers = func =>
    (func.is_generator ? 1 : 0) + (func.async ? 6 : 0);

AST_Accessor.prototype._size = function () {
    return lambda_modifiers(this) + 4 + list_overhead(this.argnames) + list_overhead(this.body);
};

AST_Function.prototype._size = function (info) {
    const first = !!first_in_statement(info);
    return (first * 2) + lambda_modifiers(this) + 12 + list_overhead(this.argnames) + list_overhead(this.body);
};

AST_Defun.prototype._size = function () {
    return lambda_modifiers(this) + 13 + list_overhead(this.argnames) + list_overhead(this.body);
};

AST_Arrow.prototype._size = function () {
    let args_and_arrow = 2 + list_overhead(this.argnames);

    if (
        !(
            this.argnames.length === 1
            && this.argnames[0] instanceof AST_Symbol
        )
    ) {
        args_and_arrow += 2; // parens around the args
    }

    const body_overhead = this.is_braceless() ? 0 : list_overhead(this.body) + 2;

    return lambda_modifiers(this) + args_and_arrow + body_overhead;
};

AST_Destructuring.prototype._size = () => 2;

AST_TemplateString.prototype._size = function () {
    return 2 + (Math.floor(this.segments.length / 2) * 3);  /* "${}" */
};

AST_TemplateSegment.prototype._size = function () {
    return this.value.length;
};

AST_Return.prototype._size = function () {
    return this.value ? 7 : 6;
};

AST_Throw.prototype._size = () => 6;

AST_Break.prototype._size = function () {
    return this.label ? 6 : 5;
};

AST_Continue.prototype._size = function () {
    return this.label ? 9 : 8;
};

AST_If.prototype._size = () => 4;

AST_Switch.prototype._size = function () {
    return 8 + list_overhead(this.body);
};

AST_Case.prototype._size = function () {
    return 5 + list_overhead(this.body);
};

AST_Default.prototype._size = function () {
    return 8 + list_overhead(this.body);
};

AST_Try.prototype._size = function () {
    return 3 + list_overhead(this.body);
};

AST_Catch.prototype._size = function () {
    let size = 7 + list_overhead(this.body);
    if (this.argname) {
        size += 2;
    }
    return size;
};

AST_Finally.prototype._size = function () {
    return 7 + list_overhead(this.body);
};

AST_Var.prototype._size = function () {
    return 4 + list_overhead(this.definitions);
};

AST_Let.prototype._size = function () {
    return 4 + list_overhead(this.definitions);
};

AST_Const.prototype._size = function () {
    return 6 + list_overhead(this.definitions);
};

AST_VarDef.prototype._size = function () {
    return this.value ? 1 : 0;
};

AST_NameMapping.prototype._size = function () {
    // foreign name isn't mangled
    return this.name ? 4 : 0;
};

AST_Import.prototype._size = function () {
    // import
    let size = 6;

    if (this.imported_name) size += 1;

    // from
    if (this.imported_name || this.imported_names) size += 5;

    // braces, and the commas
    if (this.imported_names) {
        size += 2 + list_overhead(this.imported_names);
    }

    return size;
};

AST_ImportMeta.prototype._size = () => 11;

AST_Export.prototype._size = function () {
    let size = 7 + (this.is_default ? 8 : 0);

    if (this.exported_value) {
        size += this.exported_value._size();
    }

    if (this.exported_names) {
        // Braces and commas
        size += 2 + list_overhead(this.exported_names);
    }

    if (this.module_name) {
        // "from "
        size += 5;
    }

    return size;
};

AST_Call.prototype._size = function () {
    if (this.optional) {
        return 4 + list_overhead(this.args);
    }
    return 2 + list_overhead(this.args);
};

AST_New.prototype._size = function () {
    return 6 + list_overhead(this.args);
};

AST_Sequence.prototype._size = function () {
    return list_overhead(this.expressions);
};

AST_Dot.prototype._size = function () {
    if (this.optional) {
        return this.property.length + 2;
    }
    return this.property.length + 1;
};

AST_DotHash.prototype._size = function () {
    if (this.optional) {
        return this.property.length + 3;
    }
    return this.property.length + 2;
};

AST_Sub.prototype._size = function () {
    return this.optional ? 4 : 2;
};

AST_Unary.prototype._size = function () {
    if (this.operator === "typeof") return 7;
    if (this.operator === "void") return 5;
    return this.operator.length;
};

AST_Binary.prototype._size = function (info) {
    if (this.operator === "in") return 4;

    let size = this.operator.length;

    if (
        (this.operator === "+" || this.operator === "-")
        && this.right instanceof AST_Unary && this.right.operator === this.operator
    ) {
        // 1+ +a > needs space between the +
        size += 1;
    }

    if (this.needs_parens(info)) {
        size += 2;
    }

    return size;
};

AST_Conditional.prototype._size = () => 3;

AST_Array.prototype._size = function () {
    return 2 + list_overhead(this.elements);
};

AST_Object.prototype._size = function (info) {
    let base = 2;
    if (first_in_statement(info)) {
        base += 2; // parens
    }
    return base + list_overhead(this.properties);
};

/*#__INLINE__*/
const key_size = key =>
    typeof key === "string" ? key.length : 0;

AST_ObjectKeyVal.prototype._size = function () {
    return key_size(this.key) + 1;
};

/*#__INLINE__*/
const static_size = is_static => is_static ? 7 : 0;

AST_ObjectGetter.prototype._size = function () {
    return 5 + static_size(this.static) + key_size(this.key);
};

AST_ObjectSetter.prototype._size = function () {
    return 5 + static_size(this.static) + key_size(this.key);
};

AST_ConciseMethod.prototype._size = function () {
    return static_size(this.static) + key_size(this.key) + lambda_modifiers(this);
};

AST_PrivateMethod.prototype._size = function () {
    return AST_ConciseMethod.prototype._size.call(this) + 1;
};

AST_PrivateGetter.prototype._size = AST_PrivateSetter.prototype._size = function () {
    return AST_ConciseMethod.prototype._size.call(this) + 4;
};

AST_Class.prototype._size = function () {
    return (
        (this.name ? 8 : 7)
        + (this.extends ? 8 : 0)
    );
};

AST_ClassStaticBlock.prototype._size = function () {
    // "class{}" + semicolons
    return 7 + list_overhead(this.body);
};

AST_ClassProperty.prototype._size = function () {
    return (
        static_size(this.static)
        + (typeof this.key === "string" ? this.key.length + 2 : 0)
        + (this.value ? 1 : 0)
    );
};

AST_ClassPrivateProperty.prototype._size = function () {
    return AST_ClassProperty.prototype._size.call(this) + 1;
};

AST_Symbol.prototype._size = function () {
    return !mangle_options || this.definition().unmangleable(mangle_options)
        ? this.name.length
        : 1;
};

// TODO take propmangle into account
AST_SymbolClassProperty.prototype._size = function () {
    return this.name.length;
};

AST_SymbolRef.prototype._size = AST_SymbolDeclaration.prototype._size = function () {
    const { name, thedef } = this;

    if (thedef && thedef.global) return name.length;

    if (name === "arguments") return 9;

    return AST_Symbol.prototype._size.call(this);
};

AST_NewTarget.prototype._size = () => 10;

AST_SymbolImportForeign.prototype._size = function () {
    return this.name.length;
};

AST_SymbolExportForeign.prototype._size = function () {
    return this.name.length;
};

AST_This.prototype._size = () => 4;

AST_Super.prototype._size = () => 5;

AST_String.prototype._size = function () {
    return this.value.length + 2;
};

AST_Number.prototype._size = function () {
    const { value } = this;
    if (value === 0) return 1;
    if (value > 0 && Math.floor(value) === value) {
        return Math.floor(Math.log10(value) + 1);
    }
    return value.toString().length;
};

AST_BigInt.prototype._size = function () {
    return this.value.length;
};

AST_RegExp.prototype._size = function () {
    return this.value.toString().length;
};

AST_Null.prototype._size = () => 4;

AST_NaN.prototype._size = () => 3;

AST_Undefined.prototype._size = () => 6; // "void 0"

AST_Hole.prototype._size = () => 0;  // comma is taken into account by list_overhead()

AST_Infinity.prototype._size = () => 8;

AST_True.prototype._size = () => 4;

AST_False.prototype._size = () => 5;

AST_Await.prototype._size = () => 6;

AST_Yield.prototype._size = () => 6;

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// bitfield flags to be stored in node.flags.
// These are set and unset during compression, and store information in the node without requiring multiple fields.
const UNUSED = 0b00000001;
const TRUTHY = 0b00000010;
const FALSY = 0b00000100;
const UNDEFINED = 0b00001000;
const INLINED = 0b00010000;

// Nodes to which values are ever written. Used when keep_assign is part of the unused option string.
const WRITE_ONLY = 0b00100000;

// information specific to a single compression pass
const SQUEEZED = 0b0000000100000000;
const OPTIMIZED = 0b0000001000000000;
const TOP = 0b0000010000000000;
const CLEAR_BETWEEN_PASSES = SQUEEZED | OPTIMIZED | TOP;

const has_flag = (node, flag) => node.flags & flag;
const set_flag = (node, flag) => { node.flags |= flag; };
const clear_flag = (node, flag) => { node.flags &= ~flag; };

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

function merge_sequence(array, node) {
    if (node instanceof AST_Sequence) {
        array.push(...node.expressions);
    } else {
        array.push(node);
    }
    return array;
}

function make_sequence(orig, expressions) {
    if (expressions.length == 1) return expressions[0];
    if (expressions.length == 0) throw new Error("trying to create a sequence with length zero!");
    return make_node(AST_Sequence, orig, {
        expressions: expressions.reduce(merge_sequence, [])
    });
}

function make_node_from_constant(val, orig) {
    switch (typeof val) {
      case "string":
        return make_node(AST_String, orig, {
            value: val
        });
      case "number":
        if (isNaN(val)) return make_node(AST_NaN, orig);
        if (isFinite(val)) {
            return 1 / val < 0 ? make_node(AST_UnaryPrefix, orig, {
                operator: "-",
                expression: make_node(AST_Number, orig, { value: -val })
            }) : make_node(AST_Number, orig, { value: val });
        }
        return val < 0 ? make_node(AST_UnaryPrefix, orig, {
            operator: "-",
            expression: make_node(AST_Infinity, orig)
        }) : make_node(AST_Infinity, orig);
      case "boolean":
        return make_node(val ? AST_True : AST_False, orig);
      case "undefined":
        return make_node(AST_Undefined, orig);
      default:
        if (val === null) {
            return make_node(AST_Null, orig, { value: null });
        }
        if (val instanceof RegExp) {
            return make_node(AST_RegExp, orig, {
                value: {
                    source: regexp_source_fix(val.source),
                    flags: val.flags
                }
            });
        }
        throw new Error(string_template("Can't handle constant of type: {type}", {
            type: typeof val
        }));
    }
}

function best_of_expression(ast1, ast2) {
    return ast1.size() > ast2.size() ? ast2 : ast1;
}

function best_of_statement(ast1, ast2) {
    return best_of_expression(
        make_node(AST_SimpleStatement, ast1, {
            body: ast1
        }),
        make_node(AST_SimpleStatement, ast2, {
            body: ast2
        })
    ).body;
}

/** Find which node is smaller, and return that */
function best_of(compressor, ast1, ast2) {
    if (first_in_statement(compressor)) {
        return best_of_statement(ast1, ast2);
    } else {
        return best_of_expression(ast1, ast2);
    }
}

/** Simplify an object property's key, if possible */
function get_simple_key(key) {
    if (key instanceof AST_Constant) {
        return key.getValue();
    }
    if (key instanceof AST_UnaryPrefix
        && key.operator == "void"
        && key.expression instanceof AST_Constant) {
        return;
    }
    return key;
}

function read_property(obj, key) {
    key = get_simple_key(key);
    if (key instanceof AST_Node) return;

    var value;
    if (obj instanceof AST_Array) {
        var elements = obj.elements;
        if (key == "length") return make_node_from_constant(elements.length, obj);
        if (typeof key == "number" && key in elements) value = elements[key];
    } else if (obj instanceof AST_Object) {
        key = "" + key;
        var props = obj.properties;
        for (var i = props.length; --i >= 0;) {
            var prop = props[i];
            if (!(prop instanceof AST_ObjectKeyVal)) return;
            if (!value && props[i].key === key) value = props[i].value;
        }
    }

    return value instanceof AST_SymbolRef && value.fixed_value() || value;
}

function has_break_or_continue(loop, parent) {
    var found = false;
    var tw = new TreeWalker(function(node) {
        if (found || node instanceof AST_Scope) return true;
        if (node instanceof AST_LoopControl && tw.loopcontrol_target(node) === loop) {
            return found = true;
        }
    });
    if (parent instanceof AST_LabeledStatement) tw.push(parent);
    tw.push(loop);
    loop.body.walk(tw);
    return found;
}

// we shouldn't compress (1,func)(something) to
// func(something) because that changes the meaning of
// the func (becomes lexical instead of global).
function maintain_this_binding(parent, orig, val) {
    if (
        parent instanceof AST_UnaryPrefix && parent.operator == "delete"
        || parent instanceof AST_Call && parent.expression === orig
            && (
                val instanceof AST_PropAccess
                || val instanceof AST_SymbolRef && val.name == "eval"
            )
    ) {
        const zero = make_node(AST_Number, orig, { value: 0 });
        return make_sequence(orig, [ zero, val ]);
    } else {
        return val;
    }
}

function is_func_expr(node) {
    return node instanceof AST_Arrow || node instanceof AST_Function;
}

function is_iife_call(node) {
    // Used to determine whether the node can benefit from negation.
    // Not the case with arrow functions (you need an extra set of parens).
    if (node.TYPE != "Call") return false;
    return node.expression instanceof AST_Function || is_iife_call(node.expression);
}

function is_empty(thing) {
    if (thing === null) return true;
    if (thing instanceof AST_EmptyStatement) return true;
    if (thing instanceof AST_BlockStatement) return thing.body.length == 0;
    return false;
}

const identifier_atom = makePredicate("Infinity NaN undefined");
function is_identifier_atom(node) {
    return node instanceof AST_Infinity
        || node instanceof AST_NaN
        || node instanceof AST_Undefined;
}

/** Check if this is a SymbolRef node which has one def of a certain AST type */
function is_ref_of(ref, type) {
    if (!(ref instanceof AST_SymbolRef)) return false;
    var orig = ref.definition().orig;
    for (var i = orig.length; --i >= 0;) {
        if (orig[i] instanceof type) return true;
    }
}

/**Can we turn { block contents... } into just the block contents ?
 * Not if one of these is inside.
 **/
function can_be_evicted_from_block(node) {
    return !(
        node instanceof AST_DefClass ||
        node instanceof AST_Defun ||
        node instanceof AST_Let ||
        node instanceof AST_Const ||
        node instanceof AST_Export ||
        node instanceof AST_Import
    );
}

function as_statement_array(thing) {
    if (thing === null) return [];
    if (thing instanceof AST_BlockStatement) return thing.body;
    if (thing instanceof AST_EmptyStatement) return [];
    if (thing instanceof AST_Statement) return [ thing ];
    throw new Error("Can't convert thing to statement array");
}

function is_reachable(scope_node, defs) {
    const find_ref = node => {
        if (node instanceof AST_SymbolRef && defs.includes(node.definition())) {
            return walk_abort;
        }
    };

    return walk_parent(scope_node, (node, info) => {
        if (node instanceof AST_Scope && node !== scope_node) {
            var parent = info.parent();

            if (
                parent instanceof AST_Call
                && parent.expression === node
                // Async/Generators aren't guaranteed to sync evaluate all of
                // their body steps, so it's possible they close over the variable.
                && !(node.async || node.is_generator)
            ) {
                return;
            }

            if (walk(node, find_ref)) return walk_abort;

            return true;
        }
    });
}

/** Check if a ref refers to the name of a function/class it's defined within */
function is_recursive_ref(compressor, def) {
    var node;
    for (var i = 0; node = compressor.parent(i); i++) {
        if (node instanceof AST_Lambda || node instanceof AST_Class) {
            var name = node.name;
            if (name && name.definition() === def) {
                return true;
            }
        }
    }
    return false;
}

// TODO this only works with AST_Defun, shouldn't it work for other ways of defining functions?
function retain_top_func(fn, compressor) {
    return compressor.top_retain
        && fn instanceof AST_Defun
        && has_flag(fn, TOP)
        && fn.name
        && compressor.top_retain(fn.name);
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// Lists of native methods, useful for `unsafe` option which assumes they exist.
// Note: Lots of methods and functions are missing here, in case they aren't pure
// or not available in all JS environments.

function make_nested_lookup(obj) {
    const out = new Map();
    for (var key of Object.keys(obj)) {
        out.set(key, makePredicate(obj[key]));
    }

    const does_have = (global_name, fname) => {
        const inner_map = out.get(global_name);
        return inner_map != null && inner_map.has(fname);
    };
    return does_have;
}

// Objects which are safe to access without throwing or causing a side effect.
// Usually we'd check the `unsafe` option first but these are way too common for that
const pure_prop_access_globals = new Set([
    "Number",
    "String",
    "Array",
    "Object",
    "Function",
    "Promise",
]);

const object_methods = [
    "constructor",
    "toString",
    "valueOf",
];

const is_pure_native_method = make_nested_lookup({
    Array: [
        "indexOf",
        "join",
        "lastIndexOf",
        "slice",
        ...object_methods,
    ],
    Boolean: object_methods,
    Function: object_methods,
    Number: [
        "toExponential",
        "toFixed",
        "toPrecision",
        ...object_methods,
    ],
    Object: object_methods,
    RegExp: [
        "test",
        ...object_methods,
    ],
    String: [
        "charAt",
        "charCodeAt",
        "concat",
        "indexOf",
        "italics",
        "lastIndexOf",
        "match",
        "replace",
        "search",
        "slice",
        "split",
        "substr",
        "substring",
        "toLowerCase",
        "toUpperCase",
        "trim",
        ...object_methods,
    ],
});

const is_pure_native_fn = make_nested_lookup({
    Array: [
        "isArray",
    ],
    Math: [
        "abs",
        "acos",
        "asin",
        "atan",
        "ceil",
        "cos",
        "exp",
        "floor",
        "log",
        "round",
        "sin",
        "sqrt",
        "tan",
        "atan2",
        "pow",
        "max",
        "min",
    ],
    Number: [
        "isFinite",
        "isNaN",
    ],
    Object: [
        "create",
        "getOwnPropertyDescriptor",
        "getOwnPropertyNames",
        "getPrototypeOf",
        "isExtensible",
        "isFrozen",
        "isSealed",
        "hasOwn",
        "keys",
    ],
    String: [
        "fromCharCode",
    ],
});

// Known numeric values which come with JS environments
const is_pure_native_value = make_nested_lookup({
    Math: [
        "E",
        "LN10",
        "LN2",
        "LOG2E",
        "LOG10E",
        "PI",
        "SQRT1_2",
        "SQRT2",
    ],
    Number: [
        "MAX_VALUE",
        "MIN_VALUE",
        "NaN",
        "NEGATIVE_INFINITY",
        "POSITIVE_INFINITY",
    ],
});

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// Functions and methods to infer certain facts about expressions
// It's not always possible to be 100% sure about something just by static analysis,
// so `true` means yes, and `false` means maybe

const is_undeclared_ref = (node) =>
    node instanceof AST_SymbolRef && node.definition().undeclared;

const lazy_op = makePredicate("&& || ??");
const unary_side_effects = makePredicate("delete ++ --");

// methods to determine whether an expression has a boolean result type
(function(def_is_boolean) {
    const unary_bool = makePredicate("! delete");
    const binary_bool = makePredicate("in instanceof == != === !== < <= >= >");
    def_is_boolean(AST_Node, return_false);
    def_is_boolean(AST_UnaryPrefix, function() {
        return unary_bool.has(this.operator);
    });
    def_is_boolean(AST_Binary, function() {
        return binary_bool.has(this.operator)
            || lazy_op.has(this.operator)
                && this.left.is_boolean()
                && this.right.is_boolean();
    });
    def_is_boolean(AST_Conditional, function() {
        return this.consequent.is_boolean() && this.alternative.is_boolean();
    });
    def_is_boolean(AST_Assign, function() {
        return this.operator == "=" && this.right.is_boolean();
    });
    def_is_boolean(AST_Sequence, function() {
        return this.tail_node().is_boolean();
    });
    def_is_boolean(AST_True, return_true);
    def_is_boolean(AST_False, return_true);
})(function(node, func) {
    node.DEFMETHOD("is_boolean", func);
});

// methods to determine if an expression has a numeric result type
(function(def_is_number) {
    def_is_number(AST_Node, return_false);
    def_is_number(AST_Number, return_true);
    const unary = makePredicate("+ - ~ ++ --");
    def_is_number(AST_Unary, function() {
        return unary.has(this.operator);
    });
    const numeric_ops = makePredicate("- * / % & | ^ << >> >>>");
    def_is_number(AST_Binary, function(compressor) {
        return numeric_ops.has(this.operator) || this.operator == "+"
            && this.left.is_number(compressor)
            && this.right.is_number(compressor);
    });
    def_is_number(AST_Assign, function(compressor) {
        return numeric_ops.has(this.operator.slice(0, -1))
            || this.operator == "=" && this.right.is_number(compressor);
    });
    def_is_number(AST_Sequence, function(compressor) {
        return this.tail_node().is_number(compressor);
    });
    def_is_number(AST_Conditional, function(compressor) {
        return this.consequent.is_number(compressor) && this.alternative.is_number(compressor);
    });
})(function(node, func) {
    node.DEFMETHOD("is_number", func);
});

// methods to determine if an expression has a string result type
(function(def_is_string) {
    def_is_string(AST_Node, return_false);
    def_is_string(AST_String, return_true);
    def_is_string(AST_TemplateString, return_true);
    def_is_string(AST_UnaryPrefix, function() {
        return this.operator == "typeof";
    });
    def_is_string(AST_Binary, function(compressor) {
        return this.operator == "+" &&
            (this.left.is_string(compressor) || this.right.is_string(compressor));
    });
    def_is_string(AST_Assign, function(compressor) {
        return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
    });
    def_is_string(AST_Sequence, function(compressor) {
        return this.tail_node().is_string(compressor);
    });
    def_is_string(AST_Conditional, function(compressor) {
        return this.consequent.is_string(compressor) && this.alternative.is_string(compressor);
    });
})(function(node, func) {
    node.DEFMETHOD("is_string", func);
});

function is_undefined(node, compressor) {
    return (
        has_flag(node, UNDEFINED)
        || node instanceof AST_Undefined
        || node instanceof AST_UnaryPrefix
            && node.operator == "void"
            && !node.expression.has_side_effects(compressor)
    );
}

// Is the node explicitly null or undefined.
function is_null_or_undefined(node, compressor) {
    let fixed;
    return (
        node instanceof AST_Null
        || is_undefined(node, compressor)
        || (
            node instanceof AST_SymbolRef
            && (fixed = node.definition().fixed) instanceof AST_Node
            && is_nullish(fixed, compressor)
        )
    );
}

// Find out if this expression is optionally chained from a base-point that we
// can statically analyze as null or undefined.
function is_nullish_shortcircuited(node, compressor) {
    if (node instanceof AST_PropAccess || node instanceof AST_Call) {
        return (
            (node.optional && is_null_or_undefined(node.expression, compressor))
            || is_nullish_shortcircuited(node.expression, compressor)
        );
    }
    if (node instanceof AST_Chain) return is_nullish_shortcircuited(node.expression, compressor);
    return false;
}

// Find out if something is == null, or can short circuit into nullish.
// Used to optimize ?. and ??
function is_nullish(node, compressor) {
    if (is_null_or_undefined(node, compressor)) return true;
    return is_nullish_shortcircuited(node, compressor);
}

// Determine if expression might cause side effects
// If there's a possibility that a node may change something when it's executed, this returns true
(function(def_has_side_effects) {
    def_has_side_effects(AST_Node, return_true);

    def_has_side_effects(AST_EmptyStatement, return_false);
    def_has_side_effects(AST_Constant, return_false);
    def_has_side_effects(AST_This, return_false);

    function any(list, compressor) {
        for (var i = list.length; --i >= 0;)
            if (list[i].has_side_effects(compressor))
                return true;
        return false;
    }

    def_has_side_effects(AST_Block, function(compressor) {
        return any(this.body, compressor);
    });
    def_has_side_effects(AST_Call, function(compressor) {
        if (
            !this.is_callee_pure(compressor)
            && (!this.expression.is_call_pure(compressor)
                || this.expression.has_side_effects(compressor))
        ) {
            return true;
        }
        return any(this.args, compressor);
    });
    def_has_side_effects(AST_Switch, function(compressor) {
        return this.expression.has_side_effects(compressor)
            || any(this.body, compressor);
    });
    def_has_side_effects(AST_Case, function(compressor) {
        return this.expression.has_side_effects(compressor)
            || any(this.body, compressor);
    });
    def_has_side_effects(AST_Try, function(compressor) {
        return any(this.body, compressor)
            || this.bcatch && this.bcatch.has_side_effects(compressor)
            || this.bfinally && this.bfinally.has_side_effects(compressor);
    });
    def_has_side_effects(AST_If, function(compressor) {
        return this.condition.has_side_effects(compressor)
            || this.body && this.body.has_side_effects(compressor)
            || this.alternative && this.alternative.has_side_effects(compressor);
    });
    def_has_side_effects(AST_LabeledStatement, function(compressor) {
        return this.body.has_side_effects(compressor);
    });
    def_has_side_effects(AST_SimpleStatement, function(compressor) {
        return this.body.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Lambda, return_false);
    def_has_side_effects(AST_Class, function (compressor) {
        if (this.extends && this.extends.has_side_effects(compressor)) {
            return true;
        }
        return any(this.properties, compressor);
    });
    def_has_side_effects(AST_ClassStaticBlock, function(compressor) {
        return any(this.body, compressor);
    });
    def_has_side_effects(AST_Binary, function(compressor) {
        return this.left.has_side_effects(compressor)
            || this.right.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Assign, return_true);
    def_has_side_effects(AST_Conditional, function(compressor) {
        return this.condition.has_side_effects(compressor)
            || this.consequent.has_side_effects(compressor)
            || this.alternative.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Unary, function(compressor) {
        return unary_side_effects.has(this.operator)
            || this.expression.has_side_effects(compressor);
    });
    def_has_side_effects(AST_SymbolRef, function(compressor) {
        return !this.is_declared(compressor) && !pure_prop_access_globals.has(this.name);
    });
    def_has_side_effects(AST_SymbolClassProperty, return_false);
    def_has_side_effects(AST_SymbolDeclaration, return_false);
    def_has_side_effects(AST_Object, function(compressor) {
        return any(this.properties, compressor);
    });
    def_has_side_effects(AST_ObjectProperty, function(compressor) {
        return (
            this.computed_key() && this.key.has_side_effects(compressor)
            || this.value && this.value.has_side_effects(compressor)
        );
    });
    def_has_side_effects(AST_ClassProperty, function(compressor) {
        return (
            this.computed_key() && this.key.has_side_effects(compressor)
            || this.static && this.value && this.value.has_side_effects(compressor)
        );
    });
    def_has_side_effects(AST_ConciseMethod, function(compressor) {
        return this.computed_key() && this.key.has_side_effects(compressor);
    });
    def_has_side_effects(AST_ObjectGetter, function(compressor) {
        return this.computed_key() && this.key.has_side_effects(compressor);
    });
    def_has_side_effects(AST_ObjectSetter, function(compressor) {
        return this.computed_key() && this.key.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Array, function(compressor) {
        return any(this.elements, compressor);
    });
    def_has_side_effects(AST_Dot, function(compressor) {
        if (is_nullish(this, compressor)) return false;
        return !this.optional && this.expression.may_throw_on_access(compressor)
            || this.expression.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Sub, function(compressor) {
        if (is_nullish(this, compressor)) return false;

        return !this.optional && this.expression.may_throw_on_access(compressor)
            || this.expression.has_side_effects(compressor)
            || this.property.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Chain, function (compressor) {
        return this.expression.has_side_effects(compressor);
    });
    def_has_side_effects(AST_Sequence, function(compressor) {
        return any(this.expressions, compressor);
    });
    def_has_side_effects(AST_Definitions, function(compressor) {
        return any(this.definitions, compressor);
    });
    def_has_side_effects(AST_VarDef, function() {
        return this.value;
    });
    def_has_side_effects(AST_TemplateSegment, return_false);
    def_has_side_effects(AST_TemplateString, function(compressor) {
        return any(this.segments, compressor);
    });
})(function(node, func) {
    node.DEFMETHOD("has_side_effects", func);
});

// determine if expression may throw
(function(def_may_throw) {
    def_may_throw(AST_Node, return_true);

    def_may_throw(AST_Constant, return_false);
    def_may_throw(AST_EmptyStatement, return_false);
    def_may_throw(AST_Lambda, return_false);
    def_may_throw(AST_SymbolDeclaration, return_false);
    def_may_throw(AST_This, return_false);

    function any(list, compressor) {
        for (var i = list.length; --i >= 0;)
            if (list[i].may_throw(compressor))
                return true;
        return false;
    }

    def_may_throw(AST_Class, function(compressor) {
        if (this.extends && this.extends.may_throw(compressor)) return true;
        return any(this.properties, compressor);
    });
    def_may_throw(AST_ClassStaticBlock, function (compressor) {
        return any(this.body, compressor);
    });

    def_may_throw(AST_Array, function(compressor) {
        return any(this.elements, compressor);
    });
    def_may_throw(AST_Assign, function(compressor) {
        if (this.right.may_throw(compressor)) return true;
        if (!compressor.has_directive("use strict")
            && this.operator == "="
            && this.left instanceof AST_SymbolRef) {
            return false;
        }
        return this.left.may_throw(compressor);
    });
    def_may_throw(AST_Binary, function(compressor) {
        return this.left.may_throw(compressor)
            || this.right.may_throw(compressor);
    });
    def_may_throw(AST_Block, function(compressor) {
        return any(this.body, compressor);
    });
    def_may_throw(AST_Call, function(compressor) {
        if (is_nullish(this, compressor)) return false;
        if (any(this.args, compressor)) return true;
        if (this.is_callee_pure(compressor)) return false;
        if (this.expression.may_throw(compressor)) return true;
        return !(this.expression instanceof AST_Lambda)
            || any(this.expression.body, compressor);
    });
    def_may_throw(AST_Case, function(compressor) {
        return this.expression.may_throw(compressor)
            || any(this.body, compressor);
    });
    def_may_throw(AST_Conditional, function(compressor) {
        return this.condition.may_throw(compressor)
            || this.consequent.may_throw(compressor)
            || this.alternative.may_throw(compressor);
    });
    def_may_throw(AST_Definitions, function(compressor) {
        return any(this.definitions, compressor);
    });
    def_may_throw(AST_If, function(compressor) {
        return this.condition.may_throw(compressor)
            || this.body && this.body.may_throw(compressor)
            || this.alternative && this.alternative.may_throw(compressor);
    });
    def_may_throw(AST_LabeledStatement, function(compressor) {
        return this.body.may_throw(compressor);
    });
    def_may_throw(AST_Object, function(compressor) {
        return any(this.properties, compressor);
    });
    def_may_throw(AST_ObjectProperty, function(compressor) {
        // TODO key may throw too
        return this.value ? this.value.may_throw(compressor) : false;
    });
    def_may_throw(AST_ClassProperty, function(compressor) {
        return (
            this.computed_key() && this.key.may_throw(compressor)
            || this.static && this.value && this.value.may_throw(compressor)
        );
    });
    def_may_throw(AST_ConciseMethod, function(compressor) {
        return this.computed_key() && this.key.may_throw(compressor);
    });
    def_may_throw(AST_ObjectGetter, function(compressor) {
        return this.computed_key() && this.key.may_throw(compressor);
    });
    def_may_throw(AST_ObjectSetter, function(compressor) {
        return this.computed_key() && this.key.may_throw(compressor);
    });
    def_may_throw(AST_Return, function(compressor) {
        return this.value && this.value.may_throw(compressor);
    });
    def_may_throw(AST_Sequence, function(compressor) {
        return any(this.expressions, compressor);
    });
    def_may_throw(AST_SimpleStatement, function(compressor) {
        return this.body.may_throw(compressor);
    });
    def_may_throw(AST_Dot, function(compressor) {
        if (is_nullish(this, compressor)) return false;
        return !this.optional && this.expression.may_throw_on_access(compressor)
            || this.expression.may_throw(compressor);
    });
    def_may_throw(AST_Sub, function(compressor) {
        if (is_nullish(this, compressor)) return false;
        return !this.optional && this.expression.may_throw_on_access(compressor)
            || this.expression.may_throw(compressor)
            || this.property.may_throw(compressor);
    });
    def_may_throw(AST_Chain, function(compressor) {
        return this.expression.may_throw(compressor);
    });
    def_may_throw(AST_Switch, function(compressor) {
        return this.expression.may_throw(compressor)
            || any(this.body, compressor);
    });
    def_may_throw(AST_SymbolRef, function(compressor) {
        return !this.is_declared(compressor) && !pure_prop_access_globals.has(this.name);
    });
    def_may_throw(AST_SymbolClassProperty, return_false);
    def_may_throw(AST_Try, function(compressor) {
        return this.bcatch ? this.bcatch.may_throw(compressor) : any(this.body, compressor)
            || this.bfinally && this.bfinally.may_throw(compressor);
    });
    def_may_throw(AST_Unary, function(compressor) {
        if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef)
            return false;
        return this.expression.may_throw(compressor);
    });
    def_may_throw(AST_VarDef, function(compressor) {
        if (!this.value) return false;
        return this.value.may_throw(compressor);
    });
})(function(node, func) {
    node.DEFMETHOD("may_throw", func);
});

// determine if expression is constant
(function(def_is_constant_expression) {
    function all_refs_local(scope) {
        let result = true;
        walk(this, node => {
            if (node instanceof AST_SymbolRef) {
                if (has_flag(this, INLINED)) {
                    result = false;
                    return walk_abort;
                }
                var def = node.definition();
                if (
                    member(def, this.enclosed)
                    && !this.variables.has(def.name)
                ) {
                    if (scope) {
                        var scope_def = scope.find_variable(node);
                        if (def.undeclared ? !scope_def : scope_def === def) {
                            result = "f";
                            return true;
                        }
                    }
                    result = false;
                    return walk_abort;
                }
                return true;
            }
            if (node instanceof AST_This && this instanceof AST_Arrow) {
                // TODO check arguments too!
                result = false;
                return walk_abort;
            }
        });
        return result;
    }

    def_is_constant_expression(AST_Node, return_false);
    def_is_constant_expression(AST_Constant, return_true);
    def_is_constant_expression(AST_Class, function(scope) {
        if (this.extends && !this.extends.is_constant_expression(scope)) {
            return false;
        }

        for (const prop of this.properties) {
            if (prop.computed_key() && !prop.key.is_constant_expression(scope)) {
                return false;
            }
            if (prop.static && prop.value && !prop.value.is_constant_expression(scope)) {
                return false;
            }
            if (prop instanceof AST_ClassStaticBlock) {
                return false;
            }
        }

        return all_refs_local.call(this, scope);
    });
    def_is_constant_expression(AST_Lambda, all_refs_local);
    def_is_constant_expression(AST_Unary, function() {
        return this.expression.is_constant_expression();
    });
    def_is_constant_expression(AST_Binary, function() {
        return this.left.is_constant_expression()
            && this.right.is_constant_expression();
    });
    def_is_constant_expression(AST_Array, function() {
        return this.elements.every((l) => l.is_constant_expression());
    });
    def_is_constant_expression(AST_Object, function() {
        return this.properties.every((l) => l.is_constant_expression());
    });
    def_is_constant_expression(AST_ObjectProperty, function() {
        return !!(!(this.key instanceof AST_Node) && this.value && this.value.is_constant_expression());
    });
})(function(node, func) {
    node.DEFMETHOD("is_constant_expression", func);
});


// may_throw_on_access()
// returns true if this node may be null, undefined or contain `AST_Accessor`
(function(def_may_throw_on_access) {
    AST_Node.DEFMETHOD("may_throw_on_access", function(compressor) {
        return !compressor.option("pure_getters")
            || this._dot_throw(compressor);
    });

    function is_strict(compressor) {
        return /strict/.test(compressor.option("pure_getters"));
    }

    def_may_throw_on_access(AST_Node, is_strict);
    def_may_throw_on_access(AST_Null, return_true);
    def_may_throw_on_access(AST_Undefined, return_true);
    def_may_throw_on_access(AST_Constant, return_false);
    def_may_throw_on_access(AST_Array, return_false);
    def_may_throw_on_access(AST_Object, function(compressor) {
        if (!is_strict(compressor)) return false;
        for (var i = this.properties.length; --i >=0;)
            if (this.properties[i]._dot_throw(compressor)) return true;
        return false;
    });
    // Do not be as strict with classes as we are with objects.
    // Hopefully the community is not going to abuse static getters and setters.
    // https://github.com/terser/terser/issues/724#issuecomment-643655656
    def_may_throw_on_access(AST_Class, return_false);
    def_may_throw_on_access(AST_ObjectProperty, return_false);
    def_may_throw_on_access(AST_ObjectGetter, return_true);
    def_may_throw_on_access(AST_Expansion, function(compressor) {
        return this.expression._dot_throw(compressor);
    });
    def_may_throw_on_access(AST_Function, return_false);
    def_may_throw_on_access(AST_Arrow, return_false);
    def_may_throw_on_access(AST_UnaryPostfix, return_false);
    def_may_throw_on_access(AST_UnaryPrefix, function() {
        return this.operator == "void";
    });
    def_may_throw_on_access(AST_Binary, function(compressor) {
        return (this.operator == "&&" || this.operator == "||" || this.operator == "??")
            && (this.left._dot_throw(compressor) || this.right._dot_throw(compressor));
    });
    def_may_throw_on_access(AST_Assign, function(compressor) {
        if (this.logical) return true;

        return this.operator == "="
            && this.right._dot_throw(compressor);
    });
    def_may_throw_on_access(AST_Conditional, function(compressor) {
        return this.consequent._dot_throw(compressor)
            || this.alternative._dot_throw(compressor);
    });
    def_may_throw_on_access(AST_Dot, function(compressor) {
        if (!is_strict(compressor)) return false;

        if (this.property == "prototype") {
            return !(
                this.expression instanceof AST_Function
                || this.expression instanceof AST_Class
            );
        }
        return true;
    });
    def_may_throw_on_access(AST_Chain, function(compressor) {
        return this.expression._dot_throw(compressor);
    });
    def_may_throw_on_access(AST_Sequence, function(compressor) {
        return this.tail_node()._dot_throw(compressor);
    });
    def_may_throw_on_access(AST_SymbolRef, function(compressor) {
        if (this.name === "arguments") return false;
        if (has_flag(this, UNDEFINED)) return true;
        if (!is_strict(compressor)) return false;
        if (is_undeclared_ref(this) && this.is_declared(compressor)) return false;
        if (this.is_immutable()) return false;
        var fixed = this.fixed_value();
        return !fixed || fixed._dot_throw(compressor);
    });
})(function(node, func) {
    node.DEFMETHOD("_dot_throw", func);
});

function is_lhs(node, parent) {
    if (parent instanceof AST_Unary && unary_side_effects.has(parent.operator)) return parent.expression;
    if (parent instanceof AST_Assign && parent.left === node) return node;
}

(function(def_find_defs) {
    function to_node(value, orig) {
        if (value instanceof AST_Node) {
            if (!(value instanceof AST_Constant)) {
                // Value may be a function, an array including functions and even a complex assign / block expression,
                // so it should never be shared in different places.
                // Otherwise wrong information may be used in the compression phase
                value = value.clone(true);
            }
            return make_node(value.CTOR, orig, value);
        }
        if (Array.isArray(value)) return make_node(AST_Array, orig, {
            elements: value.map(function(value) {
                return to_node(value, orig);
            })
        });
        if (value && typeof value == "object") {
            var props = [];
            for (var key in value) if (HOP(value, key)) {
                props.push(make_node(AST_ObjectKeyVal, orig, {
                    key: key,
                    value: to_node(value[key], orig)
                }));
            }
            return make_node(AST_Object, orig, {
                properties: props
            });
        }
        return make_node_from_constant(value, orig);
    }

    AST_Toplevel.DEFMETHOD("resolve_defines", function(compressor) {
        if (!compressor.option("global_defs")) return this;
        this.figure_out_scope({ ie8: compressor.option("ie8") });
        return this.transform(new TreeTransformer(function(node) {
            var def = node._find_defs(compressor, "");
            if (!def) return;
            var level = 0, child = node, parent;
            while (parent = this.parent(level++)) {
                if (!(parent instanceof AST_PropAccess)) break;
                if (parent.expression !== child) break;
                child = parent;
            }
            if (is_lhs(child, parent)) {
                return;
            }
            return def;
        }));
    });
    def_find_defs(AST_Node, noop);
    def_find_defs(AST_Chain, function(compressor, suffix) {
        return this.expression._find_defs(compressor, suffix);
    });
    def_find_defs(AST_Dot, function(compressor, suffix) {
        return this.expression._find_defs(compressor, "." + this.property + suffix);
    });
    def_find_defs(AST_SymbolDeclaration, function() {
        if (!this.global()) return;
    });
    def_find_defs(AST_SymbolRef, function(compressor, suffix) {
        if (!this.global()) return;
        var defines = compressor.option("global_defs");
        var name = this.name + suffix;
        if (HOP(defines, name)) return to_node(defines[name], this);
    });
})(function(node, func) {
    node.DEFMETHOD("_find_defs", func);
});

// method to negate an expression
(function(def_negate) {
    function basic_negation(exp) {
        return make_node(AST_UnaryPrefix, exp, {
            operator: "!",
            expression: exp
        });
    }
    function best(orig, alt, first_in_statement) {
        var negated = basic_negation(orig);
        if (first_in_statement) {
            var stat = make_node(AST_SimpleStatement, alt, {
                body: alt
            });
            return best_of_expression(negated, stat) === stat ? alt : negated;
        }
        return best_of_expression(negated, alt);
    }
    def_negate(AST_Node, function() {
        return basic_negation(this);
    });
    def_negate(AST_Statement, function() {
        throw new Error("Cannot negate a statement");
    });
    def_negate(AST_Function, function() {
        return basic_negation(this);
    });
    def_negate(AST_Arrow, function() {
        return basic_negation(this);
    });
    def_negate(AST_UnaryPrefix, function() {
        if (this.operator == "!")
            return this.expression;
        return basic_negation(this);
    });
    def_negate(AST_Sequence, function(compressor) {
        var expressions = this.expressions.slice();
        expressions.push(expressions.pop().negate(compressor));
        return make_sequence(this, expressions);
    });
    def_negate(AST_Conditional, function(compressor, first_in_statement) {
        var self = this.clone();
        self.consequent = self.consequent.negate(compressor);
        self.alternative = self.alternative.negate(compressor);
        return best(this, self, first_in_statement);
    });
    def_negate(AST_Binary, function(compressor, first_in_statement) {
        var self = this.clone(), op = this.operator;
        if (compressor.option("unsafe_comps")) {
            switch (op) {
              case "<=" : self.operator = ">"  ; return self;
              case "<"  : self.operator = ">=" ; return self;
              case ">=" : self.operator = "<"  ; return self;
              case ">"  : self.operator = "<=" ; return self;
            }
        }
        switch (op) {
          case "==" : self.operator = "!="; return self;
          case "!=" : self.operator = "=="; return self;
          case "===": self.operator = "!=="; return self;
          case "!==": self.operator = "==="; return self;
          case "&&":
            self.operator = "||";
            self.left = self.left.negate(compressor, first_in_statement);
            self.right = self.right.negate(compressor);
            return best(this, self, first_in_statement);
          case "||":
            self.operator = "&&";
            self.left = self.left.negate(compressor, first_in_statement);
            self.right = self.right.negate(compressor);
            return best(this, self, first_in_statement);
        }
        return basic_negation(this);
    });
})(function(node, func) {
    node.DEFMETHOD("negate", function(compressor, first_in_statement) {
        return func.call(this, compressor, first_in_statement);
    });
});

// Is the callee of this function pure?
var global_pure_fns = makePredicate("Boolean decodeURI decodeURIComponent Date encodeURI encodeURIComponent Error escape EvalError isFinite isNaN Number Object parseFloat parseInt RangeError ReferenceError String SyntaxError TypeError unescape URIError");
AST_Call.DEFMETHOD("is_callee_pure", function(compressor) {
    if (compressor.option("unsafe")) {
        var expr = this.expression;
        var first_arg = (this.args && this.args[0] && this.args[0].evaluate(compressor));
        if (
            expr.expression && expr.expression.name === "hasOwnProperty" &&
            (first_arg == null || first_arg.thedef && first_arg.thedef.undeclared)
        ) {
            return false;
        }
        if (is_undeclared_ref(expr) && global_pure_fns.has(expr.name)) return true;
        if (
            expr instanceof AST_Dot
            && is_undeclared_ref(expr.expression)
            && is_pure_native_fn(expr.expression.name, expr.property)
        ) {
            return true;
        }
    }
    return !!has_annotation(this, _PURE) || !compressor.pure_funcs(this);
});

// If I call this, is it a pure function?
AST_Node.DEFMETHOD("is_call_pure", return_false);
AST_Dot.DEFMETHOD("is_call_pure", function(compressor) {
    if (!compressor.option("unsafe")) return;
    const expr = this.expression;

    let native_obj;
    if (expr instanceof AST_Array) {
        native_obj = "Array";
    } else if (expr.is_boolean()) {
        native_obj = "Boolean";
    } else if (expr.is_number(compressor)) {
        native_obj = "Number";
    } else if (expr instanceof AST_RegExp) {
        native_obj = "RegExp";
    } else if (expr.is_string(compressor)) {
        native_obj = "String";
    } else if (!this.may_throw_on_access(compressor)) {
        native_obj = "Object";
    }
    return native_obj != null && is_pure_native_method(native_obj, this.property);
});

// tell me if a statement aborts
const aborts = (thing) => thing && thing.aborts();

(function(def_aborts) {
    def_aborts(AST_Statement, return_null);
    def_aborts(AST_Jump, return_this);
    function block_aborts() {
        for (var i = 0; i < this.body.length; i++) {
            if (aborts(this.body[i])) {
                return this.body[i];
            }
        }
        return null;
    }
    def_aborts(AST_Import, return_null);
    def_aborts(AST_BlockStatement, block_aborts);
    def_aborts(AST_SwitchBranch, block_aborts);
    def_aborts(AST_DefClass, function () {
        for (const prop of this.properties) {
            if (prop instanceof AST_ClassStaticBlock) {
                if (prop.aborts()) return prop;
            }
        }
        return null;
    });
    def_aborts(AST_ClassStaticBlock, block_aborts);
    def_aborts(AST_If, function() {
        return this.alternative && aborts(this.body) && aborts(this.alternative) && this;
    });
})(function(node, func) {
    node.DEFMETHOD("aborts", func);
});

function is_modified(compressor, tw, node, value, level, immutable) {
    var parent = tw.parent(level);
    var lhs = is_lhs(node, parent);
    if (lhs) return lhs;
    if (!immutable
        && parent instanceof AST_Call
        && parent.expression === node
        && !(value instanceof AST_Arrow)
        && !(value instanceof AST_Class)
        && !parent.is_callee_pure(compressor)
        && (!(value instanceof AST_Function)
            || !(parent instanceof AST_New) && value.contains_this())) {
        return true;
    }
    if (parent instanceof AST_Array) {
        return is_modified(compressor, tw, parent, parent, level + 1);
    }
    if (parent instanceof AST_ObjectKeyVal && node === parent.value) {
        var obj = tw.parent(level + 1);
        return is_modified(compressor, tw, obj, obj, level + 2);
    }
    if (parent instanceof AST_PropAccess && parent.expression === node) {
        var prop = read_property(value, parent.property);
        return !immutable && is_modified(compressor, tw, parent, prop, level + 1);
    }
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// methods to evaluate a constant expression

function def_eval(node, func) {
    node.DEFMETHOD("_eval", func);
}

// Used to propagate a nullish short-circuit signal upwards through the chain.
const nullish = Symbol("This AST_Chain is nullish");

// If the node has been successfully reduced to a constant,
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function (compressor) {
    if (!compressor.option("evaluate"))
        return this;
    var val = this._eval(compressor, 1);
    if (!val || val instanceof RegExp)
        return val;
    if (typeof val == "function" || typeof val == "object" || val == nullish)
        return this;
    return val;
});

var unaryPrefix = makePredicate("! ~ - + void");
AST_Node.DEFMETHOD("is_constant", function () {
    // Accomodate when compress option evaluate=false
    // as well as the common constant expressions !0 and -1
    if (this instanceof AST_Constant) {
        return !(this instanceof AST_RegExp);
    } else {
        return this instanceof AST_UnaryPrefix
            && this.expression instanceof AST_Constant
            && unaryPrefix.has(this.operator);
    }
});

def_eval(AST_Statement, function () {
    throw new Error(string_template("Cannot evaluate a statement [{file}:{line},{col}]", this.start));
});

def_eval(AST_Lambda, return_this);
def_eval(AST_Class, return_this);
def_eval(AST_Node, return_this);
def_eval(AST_Constant, function () {
    return this.getValue();
});

def_eval(AST_BigInt, return_this);

def_eval(AST_RegExp, function (compressor) {
    let evaluated = compressor.evaluated_regexps.get(this.value);
    if (evaluated === undefined && regexp_is_safe(this.value.source)) {
        try {
            const { source, flags } = this.value;
            evaluated = new RegExp(source, flags);
        } catch (e) {
            evaluated = null;
        }
        compressor.evaluated_regexps.set(this.value, evaluated);
    }
    return evaluated || this;
});

def_eval(AST_TemplateString, function () {
    if (this.segments.length !== 1) return this;
    return this.segments[0].value;
});

def_eval(AST_Function, function (compressor) {
    if (compressor.option("unsafe")) {
        var fn = function () { };
        fn.node = this;
        fn.toString = () => this.print_to_string();
        return fn;
    }
    return this;
});

def_eval(AST_Array, function (compressor, depth) {
    if (compressor.option("unsafe")) {
        var elements = [];
        for (var i = 0, len = this.elements.length; i < len; i++) {
            var element = this.elements[i];
            var value = element._eval(compressor, depth);
            if (element === value)
                return this;
            elements.push(value);
        }
        return elements;
    }
    return this;
});

def_eval(AST_Object, function (compressor, depth) {
    if (compressor.option("unsafe")) {
        var val = {};
        for (var i = 0, len = this.properties.length; i < len; i++) {
            var prop = this.properties[i];
            if (prop instanceof AST_Expansion)
                return this;
            var key = prop.key;
            if (key instanceof AST_Symbol) {
                key = key.name;
            } else if (key instanceof AST_Node) {
                key = key._eval(compressor, depth);
                if (key === prop.key)
                    return this;
            }
            if (typeof Object.prototype[key] === "function") {
                return this;
            }
            if (prop.value instanceof AST_Function)
                continue;
            val[key] = prop.value._eval(compressor, depth);
            if (val[key] === prop.value)
                return this;
        }
        return val;
    }
    return this;
});

var non_converting_unary = makePredicate("! typeof void");
def_eval(AST_UnaryPrefix, function (compressor, depth) {
    var e = this.expression;
    // Function would be evaluated to an array and so typeof would
    // incorrectly return 'object'. Hence making is a special case.
    if (compressor.option("typeofs")
        && this.operator == "typeof"
        && (e instanceof AST_Lambda
            || e instanceof AST_SymbolRef
            && e.fixed_value() instanceof AST_Lambda)) {
        return typeof function () { };
    }
    if (!non_converting_unary.has(this.operator))
        depth++;
    e = e._eval(compressor, depth);
    if (e === this.expression)
        return this;
    switch (this.operator) {
        case "!": return !e;
        case "typeof":
            // typeof <RegExp> returns "object" or "function" on different platforms
            // so cannot evaluate reliably
            if (e instanceof RegExp)
                return this;
            return typeof e;
        case "void": return void e;
        case "~": return ~e;
        case "-": return -e;
        case "+": return +e;
    }
    return this;
});

var non_converting_binary = makePredicate("&& || ?? === !==");
const identity_comparison = makePredicate("== != === !==");
const has_identity = value => typeof value === "object"
    || typeof value === "function"
    || typeof value === "symbol";

def_eval(AST_Binary, function (compressor, depth) {
    if (!non_converting_binary.has(this.operator))
        depth++;

    var left = this.left._eval(compressor, depth);
    if (left === this.left)
        return this;
    var right = this.right._eval(compressor, depth);
    if (right === this.right)
        return this;
    var result;

    if (left != null
        && right != null
        && identity_comparison.has(this.operator)
        && has_identity(left)
        && has_identity(right)
        && typeof left === typeof right) {
        // Do not compare by reference
        return this;
    }

    switch (this.operator) {
        case "&&": result = left && right; break;
        case "||": result = left || right; break;
        case "??": result = left != null ? left : right; break;
        case "|": result = left | right; break;
        case "&": result = left & right; break;
        case "^": result = left ^ right; break;
        case "+": result = left + right; break;
        case "*": result = left * right; break;
        case "**": result = Math.pow(left, right); break;
        case "/": result = left / right; break;
        case "%": result = left % right; break;
        case "-": result = left - right; break;
        case "<<": result = left << right; break;
        case ">>": result = left >> right; break;
        case ">>>": result = left >>> right; break;
        case "==": result = left == right; break;
        case "===": result = left === right; break;
        case "!=": result = left != right; break;
        case "!==": result = left !== right; break;
        case "<": result = left < right; break;
        case "<=": result = left <= right; break;
        case ">": result = left > right; break;
        case ">=": result = left >= right; break;
        default:
            return this;
    }
    if (isNaN(result) && compressor.find_parent(AST_With)) {
        // leave original expression as is
        return this;
    }
    return result;
});

def_eval(AST_Conditional, function (compressor, depth) {
    var condition = this.condition._eval(compressor, depth);
    if (condition === this.condition)
        return this;
    var node = condition ? this.consequent : this.alternative;
    var value = node._eval(compressor, depth);
    return value === node ? this : value;
});

// Set of AST_SymbolRef which are currently being evaluated.
// Avoids infinite recursion of ._eval()
const reentrant_ref_eval = new Set();
def_eval(AST_SymbolRef, function (compressor, depth) {
    if (reentrant_ref_eval.has(this))
        return this;

    var fixed = this.fixed_value();
    if (!fixed)
        return this;

    reentrant_ref_eval.add(this);
    const value = fixed._eval(compressor, depth);
    reentrant_ref_eval.delete(this);

    if (value === fixed)
        return this;

    if (value && typeof value == "object") {
        var escaped = this.definition().escaped;
        if (escaped && depth > escaped)
            return this;
    }
    return value;
});

const global_objs = { Array, Math, Number, Object, String };

const regexp_flags = new Set([
    "dotAll",
    "global",
    "ignoreCase",
    "multiline",
    "sticky",
    "unicode",
]);

def_eval(AST_PropAccess, function (compressor, depth) {
    let obj = this.expression._eval(compressor, depth + 1);
    if (obj === nullish || (this.optional && obj == null)) return nullish;
    if (compressor.option("unsafe")) {
        var key = this.property;
        if (key instanceof AST_Node) {
            key = key._eval(compressor, depth);
            if (key === this.property)
                return this;
        }
        var exp = this.expression;
        if (is_undeclared_ref(exp)) {

            var aa;
            var first_arg = exp.name === "hasOwnProperty"
                && key === "call"
                && (aa = compressor.parent() && compressor.parent().args)
                && (aa && aa[0]
                    && aa[0].evaluate(compressor));

            first_arg = first_arg instanceof AST_Dot ? first_arg.expression : first_arg;

            if (first_arg == null || first_arg.thedef && first_arg.thedef.undeclared) {
                return this.clone();
            }
            if (!is_pure_native_value(exp.name, key))
                return this;
            obj = global_objs[exp.name];
        } else {
            if (obj instanceof RegExp) {
                if (key == "source") {
                    return regexp_source_fix(obj.source);
                } else if (key == "flags" || regexp_flags.has(key)) {
                    return obj[key];
                }
            }
            if (!obj || obj === exp || !HOP(obj, key))
                return this;

            if (typeof obj == "function")
                switch (key) {
                    case "name":
                        return obj.node.name ? obj.node.name.name : "";
                    case "length":
                        return obj.node.length_property();
                    default:
                        return this;
                }
        }
        return obj[key];
    }
    return this;
});

def_eval(AST_Chain, function (compressor, depth) {
    const evaluated = this.expression._eval(compressor, depth);
    return evaluated === nullish
        ? undefined
        : evaluated === this.expression
          ? this
          : evaluated;
});

def_eval(AST_Call, function (compressor, depth) {
    var exp = this.expression;

    const callee = exp._eval(compressor, depth);
    if (callee === nullish || (this.optional && callee == null)) return nullish;

    if (compressor.option("unsafe") && exp instanceof AST_PropAccess) {
        var key = exp.property;
        if (key instanceof AST_Node) {
            key = key._eval(compressor, depth);
            if (key === exp.property)
                return this;
        }
        var val;
        var e = exp.expression;
        if (is_undeclared_ref(e)) {
            var first_arg = e.name === "hasOwnProperty" &&
                key === "call" &&
                (this.args[0] && this.args[0].evaluate(compressor));

            first_arg = first_arg instanceof AST_Dot ? first_arg.expression : first_arg;

            if ((first_arg == null || first_arg.thedef && first_arg.thedef.undeclared)) {
                return this.clone();
            }
            if (!is_pure_native_fn(e.name, key)) return this;
            val = global_objs[e.name];
        } else {
            val = e._eval(compressor, depth + 1);
            if (val === e || !val)
                return this;
            if (!is_pure_native_method(val.constructor.name, key))
                return this;
        }
        var args = [];
        for (var i = 0, len = this.args.length; i < len; i++) {
            var arg = this.args[i];
            var value = arg._eval(compressor, depth);
            if (arg === value)
                return this;
            if (arg instanceof AST_Lambda)
                return this;
            args.push(value);
        }
        try {
            return val[key].apply(val, args);
        } catch (ex) {
            // We don't really care
        }
    }
    return this;
});

// Also a subclass of AST_Call
def_eval(AST_New, return_this);

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// AST_Node#drop_side_effect_free() gets called when we don't care about the value,
// only about side effects. We'll be defining this method for each node type in this module
//
// Examples:
// foo++ -> foo++
// 1 + func() -> func()
// 10 -> (nothing)
// knownPureFunc(foo++) -> foo++

function def_drop_side_effect_free(node, func) {
    node.DEFMETHOD("drop_side_effect_free", func);
}

// Drop side-effect-free elements from an array of expressions.
// Returns an array of expressions with side-effects or null
// if all elements were dropped. Note: original array may be
// returned if nothing changed.
function trim(nodes, compressor, first_in_statement) {
    var len = nodes.length;
    if (!len)  return null;

    var ret = [], changed = false;
    for (var i = 0; i < len; i++) {
        var node = nodes[i].drop_side_effect_free(compressor, first_in_statement);
        changed |= node !== nodes[i];
        if (node) {
            ret.push(node);
            first_in_statement = false;
        }
    }
    return changed ? ret.length ? ret : null : nodes;
}

def_drop_side_effect_free(AST_Node, return_this);
def_drop_side_effect_free(AST_Constant, return_null);
def_drop_side_effect_free(AST_This, return_null);

def_drop_side_effect_free(AST_Call, function (compressor, first_in_statement) {
    if (is_nullish_shortcircuited(this, compressor)) {
        return this.expression.drop_side_effect_free(compressor, first_in_statement);
    }

    if (!this.is_callee_pure(compressor)) {
        if (this.expression.is_call_pure(compressor)) {
            var exprs = this.args.slice();
            exprs.unshift(this.expression.expression);
            exprs = trim(exprs, compressor, first_in_statement);
            return exprs && make_sequence(this, exprs);
        }
        if (is_func_expr(this.expression)
            && (!this.expression.name || !this.expression.name.definition().references.length)) {
            var node = this.clone();
            node.expression.process_expression(false, compressor);
            return node;
        }
        return this;
    }

    var args = trim(this.args, compressor, first_in_statement);
    return args && make_sequence(this, args);
});

def_drop_side_effect_free(AST_Accessor, return_null);

def_drop_side_effect_free(AST_Function, return_null);

def_drop_side_effect_free(AST_Arrow, return_null);

def_drop_side_effect_free(AST_Class, function (compressor) {
    const with_effects = [];
    const trimmed_extends = this.extends && this.extends.drop_side_effect_free(compressor);
    if (trimmed_extends)
        with_effects.push(trimmed_extends);
    for (const prop of this.properties) {
        if (prop instanceof AST_ClassStaticBlock) {
            if (prop.body.some(stat => stat.has_side_effects(compressor))) {
                return this;
            } else {
                continue;
            }
        }

        const trimmed_prop = prop.drop_side_effect_free(compressor);
        if (trimmed_prop)
            with_effects.push(trimmed_prop);
    }
    if (!with_effects.length)
        return null;
    return make_sequence(this, with_effects);
});

def_drop_side_effect_free(AST_Binary, function (compressor, first_in_statement) {
    var right = this.right.drop_side_effect_free(compressor);
    if (!right)
        return this.left.drop_side_effect_free(compressor, first_in_statement);
    if (lazy_op.has(this.operator)) {
        if (right === this.right)
            return this;
        var node = this.clone();
        node.right = right;
        return node;
    } else {
        var left = this.left.drop_side_effect_free(compressor, first_in_statement);
        if (!left)
            return this.right.drop_side_effect_free(compressor, first_in_statement);
        return make_sequence(this, [left, right]);
    }
});

def_drop_side_effect_free(AST_Assign, function (compressor) {
    if (this.logical)
        return this;

    var left = this.left;
    if (left.has_side_effects(compressor)
        || compressor.has_directive("use strict")
        && left instanceof AST_PropAccess
        && left.expression.is_constant()) {
        return this;
    }
    set_flag(this, WRITE_ONLY);
    while (left instanceof AST_PropAccess) {
        left = left.expression;
    }
    if (left.is_constant_expression(compressor.find_parent(AST_Scope))) {
        return this.right.drop_side_effect_free(compressor);
    }
    return this;
});

def_drop_side_effect_free(AST_Conditional, function (compressor) {
    var consequent = this.consequent.drop_side_effect_free(compressor);
    var alternative = this.alternative.drop_side_effect_free(compressor);
    if (consequent === this.consequent && alternative === this.alternative)
        return this;
    if (!consequent)
        return alternative ? make_node(AST_Binary, this, {
            operator: "||",
            left: this.condition,
            right: alternative
        }) : this.condition.drop_side_effect_free(compressor);
    if (!alternative)
        return make_node(AST_Binary, this, {
            operator: "&&",
            left: this.condition,
            right: consequent
        });
    var node = this.clone();
    node.consequent = consequent;
    node.alternative = alternative;
    return node;
});

def_drop_side_effect_free(AST_Unary, function (compressor, first_in_statement) {
    if (unary_side_effects.has(this.operator)) {
        if (!this.expression.has_side_effects(compressor)) {
            set_flag(this, WRITE_ONLY);
        } else {
            clear_flag(this, WRITE_ONLY);
        }
        return this;
    }
    if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef)
        return null;
    var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
    if (first_in_statement && expression && is_iife_call(expression)) {
        if (expression === this.expression && this.operator == "!")
            return this;
        return expression.negate(compressor, first_in_statement);
    }
    return expression;
});

def_drop_side_effect_free(AST_SymbolRef, function (compressor) {
    const safe_access = this.is_declared(compressor)
        || pure_prop_access_globals.has(this.name);
    return safe_access ? null : this;
});

def_drop_side_effect_free(AST_Object, function (compressor, first_in_statement) {
    var values = trim(this.properties, compressor, first_in_statement);
    return values && make_sequence(this, values);
});

def_drop_side_effect_free(AST_ObjectProperty, function (compressor, first_in_statement) {
    const computed_key = this instanceof AST_ObjectKeyVal && this.key instanceof AST_Node;
    const key = computed_key && this.key.drop_side_effect_free(compressor, first_in_statement);
    const value = this.value && this.value.drop_side_effect_free(compressor, first_in_statement);
    if (key && value) {
        return make_sequence(this, [key, value]);
    }
    return key || value;
});

def_drop_side_effect_free(AST_ClassProperty, function (compressor) {
    const key = this.computed_key() && this.key.drop_side_effect_free(compressor);

    const value = this.static && this.value
        && this.value.drop_side_effect_free(compressor);

    if (key && value)
        return make_sequence(this, [key, value]);
    return key || value || null;
});

def_drop_side_effect_free(AST_ConciseMethod, function () {
    return this.computed_key() ? this.key : null;
});

def_drop_side_effect_free(AST_ObjectGetter, function () {
    return this.computed_key() ? this.key : null;
});

def_drop_side_effect_free(AST_ObjectSetter, function () {
    return this.computed_key() ? this.key : null;
});

def_drop_side_effect_free(AST_Array, function (compressor, first_in_statement) {
    var values = trim(this.elements, compressor, first_in_statement);
    return values && make_sequence(this, values);
});

def_drop_side_effect_free(AST_Dot, function (compressor, first_in_statement) {
    if (is_nullish_shortcircuited(this, compressor)) {
        return this.expression.drop_side_effect_free(compressor, first_in_statement);
    }
    if (this.expression.may_throw_on_access(compressor)) return this;

    return this.expression.drop_side_effect_free(compressor, first_in_statement);
});

def_drop_side_effect_free(AST_Sub, function (compressor, first_in_statement) {
    if (is_nullish_shortcircuited(this, compressor)) {
        return this.expression.drop_side_effect_free(compressor, first_in_statement);
    }
    if (this.expression.may_throw_on_access(compressor)) return this;

    var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
    if (!expression)
        return this.property.drop_side_effect_free(compressor, first_in_statement);
    var property = this.property.drop_side_effect_free(compressor);
    if (!property)
        return expression;
    return make_sequence(this, [expression, property]);
});

def_drop_side_effect_free(AST_Chain, function (compressor, first_in_statement) {
    return this.expression.drop_side_effect_free(compressor, first_in_statement);
});

def_drop_side_effect_free(AST_Sequence, function (compressor) {
    var last = this.tail_node();
    var expr = last.drop_side_effect_free(compressor);
    if (expr === last)
        return this;
    var expressions = this.expressions.slice(0, -1);
    if (expr)
        expressions.push(expr);
    if (!expressions.length) {
        return make_node(AST_Number, this, { value: 0 });
    }
    return make_sequence(this, expressions);
});

def_drop_side_effect_free(AST_Expansion, function (compressor, first_in_statement) {
    return this.expression.drop_side_effect_free(compressor, first_in_statement);
});

def_drop_side_effect_free(AST_TemplateSegment, return_null);

def_drop_side_effect_free(AST_TemplateString, function (compressor) {
    var values = trim(this.segments, compressor, first_in_statement);
    return values && make_sequence(this, values);
});

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// Define the method AST_Node#reduce_vars, which goes through the AST in
// execution order to perform basic flow analysis

function def_reduce_vars(node, func) {
    node.DEFMETHOD("reduce_vars", func);
}

def_reduce_vars(AST_Node, noop);

function reset_def(compressor, def) {
    def.assignments = 0;
    def.chained = false;
    def.direct_access = false;
    def.escaped = 0;
    def.recursive_refs = 0;
    def.references = [];
    def.single_use = undefined;
    if (def.scope.pinned()) {
        def.fixed = false;
    } else if (def.orig[0] instanceof AST_SymbolConst || !compressor.exposed(def)) {
        def.fixed = def.init;
    } else {
        def.fixed = false;
    }
}

function reset_variables(tw, compressor, node) {
    node.variables.forEach(function(def) {
        reset_def(compressor, def);
        if (def.fixed === null) {
            tw.defs_to_safe_ids.set(def.id, tw.safe_ids);
            mark(tw, def, true);
        } else if (def.fixed) {
            tw.loop_ids.set(def.id, tw.in_loop);
            mark(tw, def, true);
        }
    });
}

function reset_block_variables(compressor, node) {
    if (node.block_scope) node.block_scope.variables.forEach((def) => {
        reset_def(compressor, def);
    });
}

function push(tw) {
    tw.safe_ids = Object.create(tw.safe_ids);
}

function pop(tw) {
    tw.safe_ids = Object.getPrototypeOf(tw.safe_ids);
}

function mark(tw, def, safe) {
    tw.safe_ids[def.id] = safe;
}

function safe_to_read(tw, def) {
    if (def.single_use == "m") return false;
    if (tw.safe_ids[def.id]) {
        if (def.fixed == null) {
            var orig = def.orig[0];
            if (orig instanceof AST_SymbolFunarg || orig.name == "arguments") return false;
            def.fixed = make_node(AST_Undefined, orig);
        }
        return true;
    }
    return def.fixed instanceof AST_Defun;
}

function safe_to_assign(tw, def, scope, value) {
    if (def.fixed === undefined) return true;
    let def_safe_ids;
    if (def.fixed === null
        && (def_safe_ids = tw.defs_to_safe_ids.get(def.id))
    ) {
        def_safe_ids[def.id] = false;
        tw.defs_to_safe_ids.delete(def.id);
        return true;
    }
    if (!HOP(tw.safe_ids, def.id)) return false;
    if (!safe_to_read(tw, def)) return false;
    if (def.fixed === false) return false;
    if (def.fixed != null && (!value || def.references.length > def.assignments)) return false;
    if (def.fixed instanceof AST_Defun) {
        return value instanceof AST_Node && def.fixed.parent_scope === scope;
    }
    return def.orig.every((sym) => {
        return !(sym instanceof AST_SymbolConst
            || sym instanceof AST_SymbolDefun
            || sym instanceof AST_SymbolLambda);
    });
}

function ref_once(tw, compressor, def) {
    return compressor.option("unused")
        && !def.scope.pinned()
        && def.references.length - def.recursive_refs == 1
        && tw.loop_ids.get(def.id) === tw.in_loop;
}

function is_immutable(value) {
    if (!value) return false;
    return value.is_constant()
        || value instanceof AST_Lambda
        || value instanceof AST_This;
}

// A definition "escapes" when its value can leave the point of use.
// Example: `a = b || c`
// In this example, "b" and "c" are escaping, because they're going into "a"
//
// def.escaped is != 0 when it escapes.
//
// When greater than 1, it means that N chained properties will be read off
// of that def before an escape occurs. This is useful for evaluating
// property accesses, where you need to know when to stop.
function mark_escaped(tw, d, scope, node, value, level = 0, depth = 1) {
    var parent = tw.parent(level);
    if (value) {
        if (value.is_constant()) return;
        if (value instanceof AST_ClassExpression) return;
    }

    if (
        parent instanceof AST_Assign && (parent.operator === "=" || parent.logical) && node === parent.right
        || parent instanceof AST_Call && (node !== parent.expression || parent instanceof AST_New)
        || parent instanceof AST_Exit && node === parent.value && node.scope !== d.scope
        || parent instanceof AST_VarDef && node === parent.value
        || parent instanceof AST_Yield && node === parent.value && node.scope !== d.scope
    ) {
        if (depth > 1 && !(value && value.is_constant_expression(scope))) depth = 1;
        if (!d.escaped || d.escaped > depth) d.escaped = depth;
        return;
    } else if (
        parent instanceof AST_Array
        || parent instanceof AST_Await
        || parent instanceof AST_Binary && lazy_op.has(parent.operator)
        || parent instanceof AST_Conditional && node !== parent.condition
        || parent instanceof AST_Expansion
        || parent instanceof AST_Sequence && node === parent.tail_node()
    ) {
        mark_escaped(tw, d, scope, parent, parent, level + 1, depth);
    } else if (parent instanceof AST_ObjectKeyVal && node === parent.value) {
        var obj = tw.parent(level + 1);

        mark_escaped(tw, d, scope, obj, obj, level + 2, depth);
    } else if (parent instanceof AST_PropAccess && node === parent.expression) {
        value = read_property(value, parent.property);

        mark_escaped(tw, d, scope, parent, value, level + 1, depth + 1);
        if (value) return;
    }

    if (level > 0) return;
    if (parent instanceof AST_Sequence && node !== parent.tail_node()) return;
    if (parent instanceof AST_SimpleStatement) return;

    d.direct_access = true;
}

const suppress = node => walk(node, node => {
    if (!(node instanceof AST_Symbol)) return;
    var d = node.definition();
    if (!d) return;
    if (node instanceof AST_SymbolRef) d.references.push(node);
    d.fixed = false;
});

def_reduce_vars(AST_Accessor, function(tw, descend, compressor) {
    push(tw);
    reset_variables(tw, compressor, this);
    descend();
    pop(tw);
    return true;
});

def_reduce_vars(AST_Assign, function(tw, descend, compressor) {
    var node = this;
    if (node.left instanceof AST_Destructuring) {
        suppress(node.left);
        return;
    }

    const finish_walk = () => {
        if (node.logical) {
            node.left.walk(tw);

            push(tw);
            node.right.walk(tw);
            pop(tw);

            return true;
        }
    };

    var sym = node.left;
    if (!(sym instanceof AST_SymbolRef)) return finish_walk();

    var def = sym.definition();
    var safe = safe_to_assign(tw, def, sym.scope, node.right);
    def.assignments++;
    if (!safe) return finish_walk();

    var fixed = def.fixed;
    if (!fixed && node.operator != "=" && !node.logical) return finish_walk();

    var eq = node.operator == "=";
    var value = eq ? node.right : node;
    if (is_modified(compressor, tw, node, value, 0)) return finish_walk();

    def.references.push(sym);

    if (!node.logical) {
        if (!eq) def.chained = true;

        def.fixed = eq ? function() {
            return node.right;
        } : function() {
            return make_node(AST_Binary, node, {
                operator: node.operator.slice(0, -1),
                left: fixed instanceof AST_Node ? fixed : fixed(),
                right: node.right
            });
        };
    }

    if (node.logical) {
        mark(tw, def, false);
        push(tw);
        node.right.walk(tw);
        pop(tw);
        return true;
    }

    mark(tw, def, false);
    node.right.walk(tw);
    mark(tw, def, true);

    mark_escaped(tw, def, sym.scope, node, value, 0, 1);

    return true;
});

def_reduce_vars(AST_Binary, function(tw) {
    if (!lazy_op.has(this.operator)) return;
    this.left.walk(tw);
    push(tw);
    this.right.walk(tw);
    pop(tw);
    return true;
});

def_reduce_vars(AST_Block, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
});

def_reduce_vars(AST_Case, function(tw) {
    push(tw);
    this.expression.walk(tw);
    pop(tw);
    push(tw);
    walk_body(this, tw);
    pop(tw);
    return true;
});

def_reduce_vars(AST_Class, function(tw, descend) {
    clear_flag(this, INLINED);
    push(tw);
    descend();
    pop(tw);
    return true;
});

def_reduce_vars(AST_ClassStaticBlock, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
});

def_reduce_vars(AST_Conditional, function(tw) {
    this.condition.walk(tw);
    push(tw);
    this.consequent.walk(tw);
    pop(tw);
    push(tw);
    this.alternative.walk(tw);
    pop(tw);
    return true;
});

def_reduce_vars(AST_Chain, function(tw, descend) {
    // Chains' conditions apply left-to-right, cumulatively.
    // If we walk normally we don't go in that order because we would pop before pushing again
    // Solution: AST_PropAccess and AST_Call push when they are optional, and never pop.
    // Then we pop everything when they are done being walked.
    const safe_ids = tw.safe_ids;

    descend();

    // Unroll back to start
    tw.safe_ids = safe_ids;
    return true;
});

def_reduce_vars(AST_Call, function (tw) {
    this.expression.walk(tw);

    if (this.optional) {
        // Never pop -- it's popped at AST_Chain above
        push(tw);
    }

    for (const arg of this.args) arg.walk(tw);

    return true;
});

def_reduce_vars(AST_PropAccess, function (tw) {
    if (!this.optional) return;

    this.expression.walk(tw);

    // Never pop -- it's popped at AST_Chain above
    push(tw);

    if (this.property instanceof AST_Node) this.property.walk(tw);

    return true;
});

def_reduce_vars(AST_Default, function(tw, descend) {
    push(tw);
    descend();
    pop(tw);
    return true;
});

function mark_lambda(tw, descend, compressor) {
    clear_flag(this, INLINED);
    push(tw);
    reset_variables(tw, compressor, this);
    if (this.uses_arguments) {
        descend();
        pop(tw);
        return;
    }
    var iife;
    if (!this.name
        && (iife = tw.parent()) instanceof AST_Call
        && iife.expression === this
        && !iife.args.some(arg => arg instanceof AST_Expansion)
        && this.argnames.every(arg_name => arg_name instanceof AST_Symbol)
    ) {
        // Virtually turn IIFE parameters into variable definitions:
        //   (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
        // So existing transformation rules can work on them.
        this.argnames.forEach((arg, i) => {
            if (!arg.definition) return;
            var d = arg.definition();
            // Avoid setting fixed when there's more than one origin for a variable value
            if (d.orig.length > 1) return;
            if (d.fixed === undefined && (!this.uses_arguments || tw.has_directive("use strict"))) {
                d.fixed = function() {
                    return iife.args[i] || make_node(AST_Undefined, iife);
                };
                tw.loop_ids.set(d.id, tw.in_loop);
                mark(tw, d, true);
            } else {
                d.fixed = false;
            }
        });
    }
    descend();
    pop(tw);
    return true;
}

def_reduce_vars(AST_Lambda, mark_lambda);

def_reduce_vars(AST_Do, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
    const saved_loop = tw.in_loop;
    tw.in_loop = this;
    push(tw);
    this.body.walk(tw);
    if (has_break_or_continue(this)) {
        pop(tw);
        push(tw);
    }
    this.condition.walk(tw);
    pop(tw);
    tw.in_loop = saved_loop;
    return true;
});

def_reduce_vars(AST_For, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
    if (this.init) this.init.walk(tw);
    const saved_loop = tw.in_loop;
    tw.in_loop = this;
    push(tw);
    if (this.condition) this.condition.walk(tw);
    this.body.walk(tw);
    if (this.step) {
        if (has_break_or_continue(this)) {
            pop(tw);
            push(tw);
        }
        this.step.walk(tw);
    }
    pop(tw);
    tw.in_loop = saved_loop;
    return true;
});

def_reduce_vars(AST_ForIn, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
    suppress(this.init);
    this.object.walk(tw);
    const saved_loop = tw.in_loop;
    tw.in_loop = this;
    push(tw);
    this.body.walk(tw);
    pop(tw);
    tw.in_loop = saved_loop;
    return true;
});

def_reduce_vars(AST_If, function(tw) {
    this.condition.walk(tw);
    push(tw);
    this.body.walk(tw);
    pop(tw);
    if (this.alternative) {
        push(tw);
        this.alternative.walk(tw);
        pop(tw);
    }
    return true;
});

def_reduce_vars(AST_LabeledStatement, function(tw) {
    push(tw);
    this.body.walk(tw);
    pop(tw);
    return true;
});

def_reduce_vars(AST_SymbolCatch, function() {
    this.definition().fixed = false;
});

def_reduce_vars(AST_SymbolRef, function(tw, descend, compressor) {
    var d = this.definition();
    d.references.push(this);
    if (d.references.length == 1
        && !d.fixed
        && d.orig[0] instanceof AST_SymbolDefun) {
        tw.loop_ids.set(d.id, tw.in_loop);
    }
    var fixed_value;
    if (d.fixed === undefined || !safe_to_read(tw, d)) {
        d.fixed = false;
    } else if (d.fixed) {
        fixed_value = this.fixed_value();
        if (
            fixed_value instanceof AST_Lambda
            && is_recursive_ref(tw, d)
        ) {
            d.recursive_refs++;
        } else if (fixed_value
            && !compressor.exposed(d)
            && ref_once(tw, compressor, d)
        ) {
            d.single_use =
                fixed_value instanceof AST_Lambda && !fixed_value.pinned()
                || fixed_value instanceof AST_Class
                || d.scope === this.scope && fixed_value.is_constant_expression();
        } else {
            d.single_use = false;
        }
        if (is_modified(compressor, tw, this, fixed_value, 0, is_immutable(fixed_value))) {
            if (d.single_use) {
                d.single_use = "m";
            } else {
                d.fixed = false;
            }
        }
    }
    mark_escaped(tw, d, this.scope, this, fixed_value, 0, 1);
});

def_reduce_vars(AST_Toplevel, function(tw, descend, compressor) {
    this.globals.forEach(function(def) {
        reset_def(compressor, def);
    });
    reset_variables(tw, compressor, this);
});

def_reduce_vars(AST_Try, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
    push(tw);
    walk_body(this, tw);
    pop(tw);
    if (this.bcatch) {
        push(tw);
        this.bcatch.walk(tw);
        pop(tw);
    }
    if (this.bfinally) this.bfinally.walk(tw);
    return true;
});

def_reduce_vars(AST_Unary, function(tw) {
    var node = this;
    if (node.operator !== "++" && node.operator !== "--") return;
    var exp = node.expression;
    if (!(exp instanceof AST_SymbolRef)) return;
    var def = exp.definition();
    var safe = safe_to_assign(tw, def, exp.scope, true);
    def.assignments++;
    if (!safe) return;
    var fixed = def.fixed;
    if (!fixed) return;
    def.references.push(exp);
    def.chained = true;
    def.fixed = function() {
        return make_node(AST_Binary, node, {
            operator: node.operator.slice(0, -1),
            left: make_node(AST_UnaryPrefix, node, {
                operator: "+",
                expression: fixed instanceof AST_Node ? fixed : fixed()
            }),
            right: make_node(AST_Number, node, {
                value: 1
            })
        });
    };
    mark(tw, def, true);
    return true;
});

def_reduce_vars(AST_VarDef, function(tw, descend) {
    var node = this;
    if (node.name instanceof AST_Destructuring) {
        suppress(node.name);
        return;
    }
    var d = node.name.definition();
    if (node.value) {
        if (safe_to_assign(tw, d, node.name.scope, node.value)) {
            d.fixed = function() {
                return node.value;
            };
            tw.loop_ids.set(d.id, tw.in_loop);
            mark(tw, d, false);
            descend();
            mark(tw, d, true);
            return true;
        } else {
            d.fixed = false;
        }
    }
});

def_reduce_vars(AST_While, function(tw, descend, compressor) {
    reset_block_variables(compressor, this);
    const saved_loop = tw.in_loop;
    tw.in_loop = this;
    push(tw);
    descend();
    pop(tw);
    tw.in_loop = saved_loop;
    return true;
});

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

function loop_body(x) {
    if (x instanceof AST_IterationStatement) {
        return x.body instanceof AST_BlockStatement ? x.body : x;
    }
    return x;
}

function is_lhs_read_only(lhs) {
    if (lhs instanceof AST_This) return true;
    if (lhs instanceof AST_SymbolRef) return lhs.definition().orig[0] instanceof AST_SymbolLambda;
    if (lhs instanceof AST_PropAccess) {
        lhs = lhs.expression;
        if (lhs instanceof AST_SymbolRef) {
            if (lhs.is_immutable()) return false;
            lhs = lhs.fixed_value();
        }
        if (!lhs) return true;
        if (lhs instanceof AST_RegExp) return false;
        if (lhs instanceof AST_Constant) return true;
        return is_lhs_read_only(lhs);
    }
    return false;
}

// Remove code which we know is unreachable.
function trim_unreachable_code(compressor, stat, target) {
    walk(stat, node => {
        if (node instanceof AST_Var) {
            node.remove_initializers();
            target.push(node);
            return true;
        }
        if (
            node instanceof AST_Defun
            && (node === stat || !compressor.has_directive("use strict"))
        ) {
            target.push(node === stat ? node : make_node(AST_Var, node, {
                definitions: [
                    make_node(AST_VarDef, node, {
                        name: make_node(AST_SymbolVar, node.name, node.name),
                        value: null
                    })
                ]
            }));
            return true;
        }
        if (node instanceof AST_Export || node instanceof AST_Import) {
            target.push(node);
            return true;
        }
        if (node instanceof AST_Scope) {
            return true;
        }
    });
}

/** Tighten a bunch of statements together, and perform statement-level optimization. */
function tighten_body(statements, compressor) {
    var in_loop, in_try;
    var scope = compressor.find_parent(AST_Scope).get_defun_scope();
    find_loop_scope_try();
    var CHANGED, max_iter = 10;
    do {
        CHANGED = false;
        eliminate_spurious_blocks(statements);
        if (compressor.option("dead_code")) {
            eliminate_dead_code(statements, compressor);
        }
        if (compressor.option("if_return")) {
            handle_if_return(statements, compressor);
        }
        if (compressor.sequences_limit > 0) {
            sequencesize(statements, compressor);
            sequencesize_2(statements, compressor);
        }
        if (compressor.option("join_vars")) {
            join_consecutive_vars(statements);
        }
        if (compressor.option("collapse_vars")) {
            collapse(statements, compressor);
        }
    } while (CHANGED && max_iter-- > 0);

    function find_loop_scope_try() {
        var node = compressor.self(), level = 0;
        do {
            if (node instanceof AST_Catch || node instanceof AST_Finally) {
                level++;
            } else if (node instanceof AST_IterationStatement) {
                in_loop = true;
            } else if (node instanceof AST_Scope) {
                scope = node;
                break;
            } else if (node instanceof AST_Try) {
                in_try = true;
            }
        } while (node = compressor.parent(level++));
    }

    // Search from right to left for assignment-like expressions:
    // - `var a = x;`
    // - `a = x;`
    // - `++a`
    // For each candidate, scan from left to right for first usage, then try
    // to fold assignment into the site for compression.
    // Will not attempt to collapse assignments into or past code blocks
    // which are not sequentially executed, e.g. loops and conditionals.
    function collapse(statements, compressor) {
        if (scope.pinned())
            return statements;
        var args;
        var candidates = [];
        var stat_index = statements.length;
        var scanner = new TreeTransformer(function (node) {
            if (abort)
                return node;
            // Skip nodes before `candidate` as quickly as possible
            if (!hit) {
                if (node !== hit_stack[hit_index])
                    return node;
                hit_index++;
                if (hit_index < hit_stack.length)
                    return handle_custom_scan_order(node);
                hit = true;
                stop_after = find_stop(node, 0);
                if (stop_after === node)
                    abort = true;
                return node;
            }
            // Stop immediately if these node types are encountered
            var parent = scanner.parent();
            if (node instanceof AST_Assign
                    && (node.logical || node.operator != "=" && lhs.equivalent_to(node.left))
                || node instanceof AST_Await
                || node instanceof AST_Call && lhs instanceof AST_PropAccess && lhs.equivalent_to(node.expression)
                || node instanceof AST_Debugger
                || node instanceof AST_Destructuring
                || node instanceof AST_Expansion
                    && node.expression instanceof AST_Symbol
                    && (
                        node.expression instanceof AST_This
                        || node.expression.definition().references.length > 1
                    )
                || node instanceof AST_IterationStatement && !(node instanceof AST_For)
                || node instanceof AST_LoopControl
                || node instanceof AST_Try
                || node instanceof AST_With
                || node instanceof AST_Yield
                || node instanceof AST_Export
                || node instanceof AST_Class
                || parent instanceof AST_For && node !== parent.init
                || !replace_all
                    && (
                        node instanceof AST_SymbolRef
                        && !node.is_declared(compressor)
                        && !pure_prop_access_globals.has(node)
                    )
                || node instanceof AST_SymbolRef
                    && parent instanceof AST_Call
                    && has_annotation(parent, _NOINLINE)
            ) {
                abort = true;
                return node;
            }
            // Stop only if candidate is found within conditional branches
            if (!stop_if_hit && (!lhs_local || !replace_all)
                && (parent instanceof AST_Binary && lazy_op.has(parent.operator) && parent.left !== node
                    || parent instanceof AST_Conditional && parent.condition !== node
                    || parent instanceof AST_If && parent.condition !== node)) {
                stop_if_hit = parent;
            }
            // Replace variable with assignment when found
            if (can_replace
                && !(node instanceof AST_SymbolDeclaration)
                && lhs.equivalent_to(node)
                && !shadows(node.scope, lvalues)
            ) {
                if (stop_if_hit) {
                    abort = true;
                    return node;
                }
                if (is_lhs(node, parent)) {
                    if (value_def)
                        replaced++;
                    return node;
                } else {
                    replaced++;
                    if (value_def && candidate instanceof AST_VarDef)
                        return node;
                }
                CHANGED = abort = true;
                if (candidate instanceof AST_UnaryPostfix) {
                    return make_node(AST_UnaryPrefix, candidate, candidate);
                }
                if (candidate instanceof AST_VarDef) {
                    var def = candidate.name.definition();
                    var value = candidate.value;
                    if (def.references.length - def.replaced == 1 && !compressor.exposed(def)) {
                        def.replaced++;
                        if (funarg && is_identifier_atom(value)) {
                            return value.transform(compressor);
                        } else {
                            return maintain_this_binding(parent, node, value);
                        }
                    }
                    return make_node(AST_Assign, candidate, {
                        operator: "=",
                        logical: false,
                        left: make_node(AST_SymbolRef, candidate.name, candidate.name),
                        right: value
                    });
                }
                clear_flag(candidate, WRITE_ONLY);
                return candidate;
            }
            // These node types have child nodes that execute sequentially,
            // but are otherwise not safe to scan into or beyond them.
            var sym;
            if (node instanceof AST_Call
                || node instanceof AST_Exit
                && (side_effects || lhs instanceof AST_PropAccess || may_modify(lhs))
                || node instanceof AST_PropAccess
                && (side_effects || node.expression.may_throw_on_access(compressor))
                || node instanceof AST_SymbolRef
                && ((lvalues.has(node.name) && lvalues.get(node.name).modified) || side_effects && may_modify(node))
                || node instanceof AST_VarDef && node.value
                && (lvalues.has(node.name.name) || side_effects && may_modify(node.name))
                || (sym = is_lhs(node.left, node))
                && (sym instanceof AST_PropAccess || lvalues.has(sym.name))
                || may_throw
                && (in_try ? node.has_side_effects(compressor) : side_effects_external(node))) {
                stop_after = node;
                if (node instanceof AST_Scope)
                    abort = true;
            }
            return handle_custom_scan_order(node);
        }, function (node) {
            if (abort)
                return;
            if (stop_after === node)
                abort = true;
            if (stop_if_hit === node)
                stop_if_hit = null;
        });

        var multi_replacer = new TreeTransformer(function (node) {
            if (abort)
                return node;
            // Skip nodes before `candidate` as quickly as possible
            if (!hit) {
                if (node !== hit_stack[hit_index])
                    return node;
                hit_index++;
                if (hit_index < hit_stack.length)
                    return;
                hit = true;
                return node;
            }
            // Replace variable when found
            if (node instanceof AST_SymbolRef
                && node.name == def.name) {
                if (!--replaced)
                    abort = true;
                if (is_lhs(node, multi_replacer.parent()))
                    return node;
                def.replaced++;
                value_def.replaced--;
                return candidate.value;
            }
            // Skip (non-executed) functions and (leading) default case in switch statements
            if (node instanceof AST_Default || node instanceof AST_Scope)
                return node;
        });

        while (--stat_index >= 0) {
            // Treat parameters as collapsible in IIFE, i.e.
            //   function(a, b){ ... }(x());
            // would be translated into equivalent assignments:
            //   var a = x(), b = undefined;
            if (stat_index == 0 && compressor.option("unused"))
                extract_args();
            // Find collapsible assignments
            var hit_stack = [];
            extract_candidates(statements[stat_index]);
            while (candidates.length > 0) {
                hit_stack = candidates.pop();
                var hit_index = 0;
                var candidate = hit_stack[hit_stack.length - 1];
                var value_def = null;
                var stop_after = null;
                var stop_if_hit = null;
                var lhs = get_lhs(candidate);
                if (!lhs || is_lhs_read_only(lhs) || lhs.has_side_effects(compressor))
                    continue;
                // Locate symbols which may execute code outside of scanning range
                var lvalues = get_lvalues(candidate);
                var lhs_local = is_lhs_local(lhs);
                if (lhs instanceof AST_SymbolRef) {
                    lvalues.set(lhs.name, { def: lhs.definition(), modified: false });
                }
                var side_effects = value_has_side_effects(candidate);
                var replace_all = replace_all_symbols();
                var may_throw = candidate.may_throw(compressor);
                var funarg = candidate.name instanceof AST_SymbolFunarg;
                var hit = funarg;
                var abort = false, replaced = 0, can_replace = !args || !hit;
                if (!can_replace) {
                    for (var j = compressor.self().argnames.lastIndexOf(candidate.name) + 1; !abort && j < args.length; j++) {
                        args[j].transform(scanner);
                    }
                    can_replace = true;
                }
                for (var i = stat_index; !abort && i < statements.length; i++) {
                    statements[i].transform(scanner);
                }
                if (value_def) {
                    var def = candidate.name.definition();
                    if (abort && def.references.length - def.replaced > replaced)
                        replaced = false;
                    else {
                        abort = false;
                        hit_index = 0;
                        hit = funarg;
                        for (var i = stat_index; !abort && i < statements.length; i++) {
                            statements[i].transform(multi_replacer);
                        }
                        value_def.single_use = false;
                    }
                }
                if (replaced && !remove_candidate(candidate))
                    statements.splice(stat_index, 1);
            }
        }

        function handle_custom_scan_order(node) {
            // Skip (non-executed) functions
            if (node instanceof AST_Scope)
                return node;

            // Scan case expressions first in a switch statement
            if (node instanceof AST_Switch) {
                node.expression = node.expression.transform(scanner);
                for (var i = 0, len = node.body.length; !abort && i < len; i++) {
                    var branch = node.body[i];
                    if (branch instanceof AST_Case) {
                        if (!hit) {
                            if (branch !== hit_stack[hit_index])
                                continue;
                            hit_index++;
                        }
                        branch.expression = branch.expression.transform(scanner);
                        if (!replace_all)
                            break;
                    }
                }
                abort = true;
                return node;
            }
        }

        function redefined_within_scope(def, scope) {
            if (def.global)
                return false;
            let cur_scope = def.scope;
            while (cur_scope && cur_scope !== scope) {
                if (cur_scope.variables.has(def.name)) {
                    return true;
                }
                cur_scope = cur_scope.parent_scope;
            }
            return false;
        }

        function has_overlapping_symbol(fn, arg, fn_strict) {
            var found = false, scan_this = !(fn instanceof AST_Arrow);
            arg.walk(new TreeWalker(function (node, descend) {
                if (found)
                    return true;
                if (node instanceof AST_SymbolRef && (fn.variables.has(node.name) || redefined_within_scope(node.definition(), fn))) {
                    var s = node.definition().scope;
                    if (s !== scope)
                        while (s = s.parent_scope) {
                            if (s === scope)
                                return true;
                        }
                    return found = true;
                }
                if ((fn_strict || scan_this) && node instanceof AST_This) {
                    return found = true;
                }
                if (node instanceof AST_Scope && !(node instanceof AST_Arrow)) {
                    var prev = scan_this;
                    scan_this = false;
                    descend();
                    scan_this = prev;
                    return true;
                }
            }));
            return found;
        }

        function extract_args() {
            var iife, fn = compressor.self();
            if (is_func_expr(fn)
                && !fn.name
                && !fn.uses_arguments
                && !fn.pinned()
                && (iife = compressor.parent()) instanceof AST_Call
                && iife.expression === fn
                && iife.args.every((arg) => !(arg instanceof AST_Expansion))) {
                var fn_strict = compressor.has_directive("use strict");
                if (fn_strict && !member(fn_strict, fn.body))
                    fn_strict = false;
                var len = fn.argnames.length;
                args = iife.args.slice(len);
                var names = new Set();
                for (var i = len; --i >= 0;) {
                    var sym = fn.argnames[i];
                    var arg = iife.args[i];
                    // The following two line fix is a duplicate of the fix at
                    // https://github.com/terser/terser/commit/011d3eb08cefe6922c7d1bdfa113fc4aeaca1b75
                    // This might mean that these two pieces of code (one here in collapse_vars and another in reduce_vars
                    // Might be doing the exact same thing.
                    const def = sym.definition && sym.definition();
                    const is_reassigned = def && def.orig.length > 1;
                    if (is_reassigned)
                        continue;
                    args.unshift(make_node(AST_VarDef, sym, {
                        name: sym,
                        value: arg
                    }));
                    if (names.has(sym.name))
                        continue;
                    names.add(sym.name);
                    if (sym instanceof AST_Expansion) {
                        var elements = iife.args.slice(i);
                        if (elements.every((arg) => !has_overlapping_symbol(fn, arg, fn_strict)
                        )) {
                            candidates.unshift([make_node(AST_VarDef, sym, {
                                name: sym.expression,
                                value: make_node(AST_Array, iife, {
                                    elements: elements
                                })
                            })]);
                        }
                    } else {
                        if (!arg) {
                            arg = make_node(AST_Undefined, sym).transform(compressor);
                        } else if (arg instanceof AST_Lambda && arg.pinned()
                            || has_overlapping_symbol(fn, arg, fn_strict)) {
                            arg = null;
                        }
                        if (arg)
                            candidates.unshift([make_node(AST_VarDef, sym, {
                                name: sym,
                                value: arg
                            })]);
                    }
                }
            }
        }

        function extract_candidates(expr) {
            hit_stack.push(expr);
            if (expr instanceof AST_Assign) {
                if (!expr.left.has_side_effects(compressor)
                    && !(expr.right instanceof AST_Chain)) {
                    candidates.push(hit_stack.slice());
                }
                extract_candidates(expr.right);
            } else if (expr instanceof AST_Binary) {
                extract_candidates(expr.left);
                extract_candidates(expr.right);
            } else if (expr instanceof AST_Call && !has_annotation(expr, _NOINLINE)) {
                extract_candidates(expr.expression);
                expr.args.forEach(extract_candidates);
            } else if (expr instanceof AST_Case) {
                extract_candidates(expr.expression);
            } else if (expr instanceof AST_Conditional) {
                extract_candidates(expr.condition);
                extract_candidates(expr.consequent);
                extract_candidates(expr.alternative);
            } else if (expr instanceof AST_Definitions) {
                var len = expr.definitions.length;
                // limit number of trailing variable definitions for consideration
                var i = len - 200;
                if (i < 0)
                    i = 0;
                for (; i < len; i++) {
                    extract_candidates(expr.definitions[i]);
                }
            } else if (expr instanceof AST_DWLoop) {
                extract_candidates(expr.condition);
                if (!(expr.body instanceof AST_Block)) {
                    extract_candidates(expr.body);
                }
            } else if (expr instanceof AST_Exit) {
                if (expr.value)
                    extract_candidates(expr.value);
            } else if (expr instanceof AST_For) {
                if (expr.init)
                    extract_candidates(expr.init);
                if (expr.condition)
                    extract_candidates(expr.condition);
                if (expr.step)
                    extract_candidates(expr.step);
                if (!(expr.body instanceof AST_Block)) {
                    extract_candidates(expr.body);
                }
            } else if (expr instanceof AST_ForIn) {
                extract_candidates(expr.object);
                if (!(expr.body instanceof AST_Block)) {
                    extract_candidates(expr.body);
                }
            } else if (expr instanceof AST_If) {
                extract_candidates(expr.condition);
                if (!(expr.body instanceof AST_Block)) {
                    extract_candidates(expr.body);
                }
                if (expr.alternative && !(expr.alternative instanceof AST_Block)) {
                    extract_candidates(expr.alternative);
                }
            } else if (expr instanceof AST_Sequence) {
                expr.expressions.forEach(extract_candidates);
            } else if (expr instanceof AST_SimpleStatement) {
                extract_candidates(expr.body);
            } else if (expr instanceof AST_Switch) {
                extract_candidates(expr.expression);
                expr.body.forEach(extract_candidates);
            } else if (expr instanceof AST_Unary) {
                if (expr.operator == "++" || expr.operator == "--") {
                    candidates.push(hit_stack.slice());
                }
            } else if (expr instanceof AST_VarDef) {
                if (expr.value && !(expr.value instanceof AST_Chain)) {
                    candidates.push(hit_stack.slice());
                    extract_candidates(expr.value);
                }
            }
            hit_stack.pop();
        }

        function find_stop(node, level, write_only) {
            var parent = scanner.parent(level);
            if (parent instanceof AST_Assign) {
                if (write_only
                    && !parent.logical
                    && !(parent.left instanceof AST_PropAccess
                        || lvalues.has(parent.left.name))) {
                    return find_stop(parent, level + 1, write_only);
                }
                return node;
            }
            if (parent instanceof AST_Binary) {
                if (write_only && (!lazy_op.has(parent.operator) || parent.left === node)) {
                    return find_stop(parent, level + 1, write_only);
                }
                return node;
            }
            if (parent instanceof AST_Call)
                return node;
            if (parent instanceof AST_Case)
                return node;
            if (parent instanceof AST_Conditional) {
                if (write_only && parent.condition === node) {
                    return find_stop(parent, level + 1, write_only);
                }
                return node;
            }
            if (parent instanceof AST_Definitions) {
                return find_stop(parent, level + 1, true);
            }
            if (parent instanceof AST_Exit) {
                return write_only ? find_stop(parent, level + 1, write_only) : node;
            }
            if (parent instanceof AST_If) {
                if (write_only && parent.condition === node) {
                    return find_stop(parent, level + 1, write_only);
                }
                return node;
            }
            if (parent instanceof AST_IterationStatement)
                return node;
            if (parent instanceof AST_Sequence) {
                return find_stop(parent, level + 1, parent.tail_node() !== node);
            }
            if (parent instanceof AST_SimpleStatement) {
                return find_stop(parent, level + 1, true);
            }
            if (parent instanceof AST_Switch)
                return node;
            if (parent instanceof AST_VarDef)
                return node;
            return null;
        }

        function mangleable_var(var_def) {
            var value = var_def.value;
            if (!(value instanceof AST_SymbolRef))
                return;
            if (value.name == "arguments")
                return;
            var def = value.definition();
            if (def.undeclared)
                return;
            return value_def = def;
        }

        function get_lhs(expr) {
            if (expr instanceof AST_Assign && expr.logical) {
                return false;
            } else if (expr instanceof AST_VarDef && expr.name instanceof AST_SymbolDeclaration) {
                var def = expr.name.definition();
                if (!member(expr.name, def.orig))
                    return;
                var referenced = def.references.length - def.replaced;
                if (!referenced)
                    return;
                var declared = def.orig.length - def.eliminated;
                if (declared > 1 && !(expr.name instanceof AST_SymbolFunarg)
                    || (referenced > 1 ? mangleable_var(expr) : !compressor.exposed(def))) {
                    return make_node(AST_SymbolRef, expr.name, expr.name);
                }
            } else {
                const lhs = expr instanceof AST_Assign
                    ? expr.left
                    : expr.expression;
                return !is_ref_of(lhs, AST_SymbolConst)
                    && !is_ref_of(lhs, AST_SymbolLet) && lhs;
            }
        }

        function get_rvalue(expr) {
            if (expr instanceof AST_Assign) {
                return expr.right;
            } else {
                return expr.value;
            }
        }

        function get_lvalues(expr) {
            var lvalues = new Map();
            if (expr instanceof AST_Unary)
                return lvalues;
            var tw = new TreeWalker(function (node) {
                var sym = node;
                while (sym instanceof AST_PropAccess)
                    sym = sym.expression;
                if (sym instanceof AST_SymbolRef) {
                    const prev = lvalues.get(sym.name);
                    if (!prev || !prev.modified) {
                        lvalues.set(sym.name, {
                            def: sym.definition(),
                            modified: is_modified(compressor, tw, node, node, 0)
                        });
                    }
                }
            });
            get_rvalue(expr).walk(tw);
            return lvalues;
        }

        function remove_candidate(expr) {
            if (expr.name instanceof AST_SymbolFunarg) {
                var iife = compressor.parent(), argnames = compressor.self().argnames;
                var index = argnames.indexOf(expr.name);
                if (index < 0) {
                    iife.args.length = Math.min(iife.args.length, argnames.length - 1);
                } else {
                    var args = iife.args;
                    if (args[index])
                        args[index] = make_node(AST_Number, args[index], {
                            value: 0
                        });
                }
                return true;
            }
            var found = false;
            return statements[stat_index].transform(new TreeTransformer(function (node, descend, in_list) {
                if (found)
                    return node;
                if (node === expr || node.body === expr) {
                    found = true;
                    if (node instanceof AST_VarDef) {
                        node.value = node.name instanceof AST_SymbolConst
                            ? make_node(AST_Undefined, node.value) // `const` always needs value.
                            : null;
                        return node;
                    }
                    return in_list ? MAP.skip : null;
                }
            }, function (node) {
                if (node instanceof AST_Sequence)
                    switch (node.expressions.length) {
                        case 0: return null;
                        case 1: return node.expressions[0];
                    }
            }));
        }

        function is_lhs_local(lhs) {
            while (lhs instanceof AST_PropAccess)
                lhs = lhs.expression;
            return lhs instanceof AST_SymbolRef
                && lhs.definition().scope === scope
                && !(in_loop
                    && (lvalues.has(lhs.name)
                        || candidate instanceof AST_Unary
                        || (candidate instanceof AST_Assign
                            && !candidate.logical
                            && candidate.operator != "=")));
        }

        function value_has_side_effects(expr) {
            if (expr instanceof AST_Unary)
                return unary_side_effects.has(expr.operator);
            return get_rvalue(expr).has_side_effects(compressor);
        }

        function replace_all_symbols() {
            if (side_effects)
                return false;
            if (value_def)
                return true;
            if (lhs instanceof AST_SymbolRef) {
                var def = lhs.definition();
                if (def.references.length - def.replaced == (candidate instanceof AST_VarDef ? 1 : 2)) {
                    return true;
                }
            }
            return false;
        }

        function may_modify(sym) {
            if (!sym.definition)
                return true; // AST_Destructuring
            var def = sym.definition();
            if (def.orig.length == 1 && def.orig[0] instanceof AST_SymbolDefun)
                return false;
            if (def.scope.get_defun_scope() !== scope)
                return true;
            return !def.references.every((ref) => {
                var s = ref.scope.get_defun_scope();
                // "block" scope within AST_Catch
                if (s.TYPE == "Scope")
                    s = s.parent_scope;
                return s === scope;
            });
        }

        function side_effects_external(node, lhs) {
            if (node instanceof AST_Assign)
                return side_effects_external(node.left, true);
            if (node instanceof AST_Unary)
                return side_effects_external(node.expression, true);
            if (node instanceof AST_VarDef)
                return node.value && side_effects_external(node.value);
            if (lhs) {
                if (node instanceof AST_Dot)
                    return side_effects_external(node.expression, true);
                if (node instanceof AST_Sub)
                    return side_effects_external(node.expression, true);
                if (node instanceof AST_SymbolRef)
                    return node.definition().scope !== scope;
            }
            return false;
        }

        function shadows(newScope, lvalues) {
            for (const {def} of lvalues.values()) {
                let current = newScope;
                while (current && current !== def.scope) {
                    let nested_def = current.variables.get(def.name);
                    if (nested_def && nested_def !== def) return true;
                    current = current.parent_scope;
                }
            }
            return false;
        }
    }

    function eliminate_spurious_blocks(statements) {
        var seen_dirs = [];
        for (var i = 0; i < statements.length;) {
            var stat = statements[i];
            if (stat instanceof AST_BlockStatement && stat.body.every(can_be_evicted_from_block)) {
                CHANGED = true;
                eliminate_spurious_blocks(stat.body);
                statements.splice(i, 1, ...stat.body);
                i += stat.body.length;
            } else if (stat instanceof AST_EmptyStatement) {
                CHANGED = true;
                statements.splice(i, 1);
            } else if (stat instanceof AST_Directive) {
                if (seen_dirs.indexOf(stat.value) < 0) {
                    i++;
                    seen_dirs.push(stat.value);
                } else {
                    CHANGED = true;
                    statements.splice(i, 1);
                }
            } else
                i++;
        }
    }

    function handle_if_return(statements, compressor) {
        var self = compressor.self();
        var multiple_if_returns = has_multiple_if_returns(statements);
        var in_lambda = self instanceof AST_Lambda;
        for (var i = statements.length; --i >= 0;) {
            var stat = statements[i];
            var j = next_index(i);
            var next = statements[j];

            if (in_lambda && !next && stat instanceof AST_Return) {
                if (!stat.value) {
                    CHANGED = true;
                    statements.splice(i, 1);
                    continue;
                }
                if (stat.value instanceof AST_UnaryPrefix && stat.value.operator == "void") {
                    CHANGED = true;
                    statements[i] = make_node(AST_SimpleStatement, stat, {
                        body: stat.value.expression
                    });
                    continue;
                }
            }

            if (stat instanceof AST_If) {
                var ab = aborts(stat.body);
                if (can_merge_flow(ab)) {
                    if (ab.label) {
                        remove(ab.label.thedef.references, ab);
                    }
                    CHANGED = true;
                    stat = stat.clone();
                    stat.condition = stat.condition.negate(compressor);
                    var body = as_statement_array_with_return(stat.body, ab);
                    stat.body = make_node(AST_BlockStatement, stat, {
                        body: as_statement_array(stat.alternative).concat(extract_functions())
                    });
                    stat.alternative = make_node(AST_BlockStatement, stat, {
                        body: body
                    });
                    statements[i] = stat.transform(compressor);
                    continue;
                }

                var ab = aborts(stat.alternative);
                if (can_merge_flow(ab)) {
                    if (ab.label) {
                        remove(ab.label.thedef.references, ab);
                    }
                    CHANGED = true;
                    stat = stat.clone();
                    stat.body = make_node(AST_BlockStatement, stat.body, {
                        body: as_statement_array(stat.body).concat(extract_functions())
                    });
                    var body = as_statement_array_with_return(stat.alternative, ab);
                    stat.alternative = make_node(AST_BlockStatement, stat.alternative, {
                        body: body
                    });
                    statements[i] = stat.transform(compressor);
                    continue;
                }
            }

            if (stat instanceof AST_If && stat.body instanceof AST_Return) {
                var value = stat.body.value;
                //---
                // pretty silly case, but:
                // if (foo()) return; return; ==> foo(); return;
                if (!value && !stat.alternative
                    && (in_lambda && !next || next instanceof AST_Return && !next.value)) {
                    CHANGED = true;
                    statements[i] = make_node(AST_SimpleStatement, stat.condition, {
                        body: stat.condition
                    });
                    continue;
                }
                //---
                // if (foo()) return x; return y; ==> return foo() ? x : y;
                if (value && !stat.alternative && next instanceof AST_Return && next.value) {
                    CHANGED = true;
                    stat = stat.clone();
                    stat.alternative = next;
                    statements[i] = stat.transform(compressor);
                    statements.splice(j, 1);
                    continue;
                }
                //---
                // if (foo()) return x; [ return ; ] ==> return foo() ? x : undefined;
                if (value && !stat.alternative
                    && (!next && in_lambda && multiple_if_returns
                        || next instanceof AST_Return)) {
                    CHANGED = true;
                    stat = stat.clone();
                    stat.alternative = next || make_node(AST_Return, stat, {
                        value: null
                    });
                    statements[i] = stat.transform(compressor);
                    if (next)
                        statements.splice(j, 1);
                    continue;
                }
                //---
                // if (a) return b; if (c) return d; e; ==> return a ? b : c ? d : void e;
                //
                // if sequences is not enabled, this can lead to an endless loop (issue #866).
                // however, with sequences on this helps producing slightly better output for
                // the example code.
                var prev = statements[prev_index(i)];
                if (compressor.option("sequences") && in_lambda && !stat.alternative
                    && prev instanceof AST_If && prev.body instanceof AST_Return
                    && next_index(j) == statements.length && next instanceof AST_SimpleStatement) {
                    CHANGED = true;
                    stat = stat.clone();
                    stat.alternative = make_node(AST_BlockStatement, next, {
                        body: [
                            next,
                            make_node(AST_Return, next, {
                                value: null
                            })
                        ]
                    });
                    statements[i] = stat.transform(compressor);
                    statements.splice(j, 1);
                    continue;
                }
            }
        }

        function has_multiple_if_returns(statements) {
            var n = 0;
            for (var i = statements.length; --i >= 0;) {
                var stat = statements[i];
                if (stat instanceof AST_If && stat.body instanceof AST_Return) {
                    if (++n > 1)
                        return true;
                }
            }
            return false;
        }

        function is_return_void(value) {
            return !value || value instanceof AST_UnaryPrefix && value.operator == "void";
        }

        function can_merge_flow(ab) {
            if (!ab)
                return false;
            for (var j = i + 1, len = statements.length; j < len; j++) {
                var stat = statements[j];
                if (stat instanceof AST_Const || stat instanceof AST_Let)
                    return false;
            }
            var lct = ab instanceof AST_LoopControl ? compressor.loopcontrol_target(ab) : null;
            return ab instanceof AST_Return && in_lambda && is_return_void(ab.value)
                || ab instanceof AST_Continue && self === loop_body(lct)
                || ab instanceof AST_Break && lct instanceof AST_BlockStatement && self === lct;
        }

        function extract_functions() {
            var tail = statements.slice(i + 1);
            statements.length = i + 1;
            return tail.filter(function (stat) {
                if (stat instanceof AST_Defun) {
                    statements.push(stat);
                    return false;
                }
                return true;
            });
        }

        function as_statement_array_with_return(node, ab) {
            var body = as_statement_array(node).slice(0, -1);
            if (ab.value) {
                body.push(make_node(AST_SimpleStatement, ab.value, {
                    body: ab.value.expression
                }));
            }
            return body;
        }

        function next_index(i) {
            for (var j = i + 1, len = statements.length; j < len; j++) {
                var stat = statements[j];
                if (!(stat instanceof AST_Var && declarations_only(stat))) {
                    break;
                }
            }
            return j;
        }

        function prev_index(i) {
            for (var j = i; --j >= 0;) {
                var stat = statements[j];
                if (!(stat instanceof AST_Var && declarations_only(stat))) {
                    break;
                }
            }
            return j;
        }
    }

    function eliminate_dead_code(statements, compressor) {
        var has_quit;
        var self = compressor.self();
        for (var i = 0, n = 0, len = statements.length; i < len; i++) {
            var stat = statements[i];
            if (stat instanceof AST_LoopControl) {
                var lct = compressor.loopcontrol_target(stat);
                if (stat instanceof AST_Break
                    && !(lct instanceof AST_IterationStatement)
                    && loop_body(lct) === self
                    || stat instanceof AST_Continue
                    && loop_body(lct) === self) {
                    if (stat.label) {
                        remove(stat.label.thedef.references, stat);
                    }
                } else {
                    statements[n++] = stat;
                }
            } else {
                statements[n++] = stat;
            }
            if (aborts(stat)) {
                has_quit = statements.slice(i + 1);
                break;
            }
        }
        statements.length = n;
        CHANGED = n != len;
        if (has_quit)
            has_quit.forEach(function (stat) {
                trim_unreachable_code(compressor, stat, statements);
            });
    }

    function declarations_only(node) {
        return node.definitions.every((var_def) => !var_def.value);
    }

    function sequencesize(statements, compressor) {
        if (statements.length < 2)
            return;
        var seq = [], n = 0;
        function push_seq() {
            if (!seq.length)
                return;
            var body = make_sequence(seq[0], seq);
            statements[n++] = make_node(AST_SimpleStatement, body, { body: body });
            seq = [];
        }
        for (var i = 0, len = statements.length; i < len; i++) {
            var stat = statements[i];
            if (stat instanceof AST_SimpleStatement) {
                if (seq.length >= compressor.sequences_limit)
                    push_seq();
                var body = stat.body;
                if (seq.length > 0)
                    body = body.drop_side_effect_free(compressor);
                if (body)
                    merge_sequence(seq, body);
            } else if (stat instanceof AST_Definitions && declarations_only(stat)
                || stat instanceof AST_Defun) {
                statements[n++] = stat;
            } else {
                push_seq();
                statements[n++] = stat;
            }
        }
        push_seq();
        statements.length = n;
        if (n != len)
            CHANGED = true;
    }

    function to_simple_statement(block, decls) {
        if (!(block instanceof AST_BlockStatement))
            return block;
        var stat = null;
        for (var i = 0, len = block.body.length; i < len; i++) {
            var line = block.body[i];
            if (line instanceof AST_Var && declarations_only(line)) {
                decls.push(line);
            } else if (stat || line instanceof AST_Const || line instanceof AST_Let) {
                return false;
            } else {
                stat = line;
            }
        }
        return stat;
    }

    function sequencesize_2(statements, compressor) {
        function cons_seq(right) {
            n--;
            CHANGED = true;
            var left = prev.body;
            return make_sequence(left, [left, right]).transform(compressor);
        }
        var n = 0, prev;
        for (var i = 0; i < statements.length; i++) {
            var stat = statements[i];
            if (prev) {
                if (stat instanceof AST_Exit) {
                    stat.value = cons_seq(stat.value || make_node(AST_Undefined, stat).transform(compressor));
                } else if (stat instanceof AST_For) {
                    if (!(stat.init instanceof AST_Definitions)) {
                        const abort = walk(prev.body, node => {
                            if (node instanceof AST_Scope)
                                return true;
                            if (node instanceof AST_Binary
                                && node.operator === "in") {
                                return walk_abort;
                            }
                        });
                        if (!abort) {
                            if (stat.init)
                                stat.init = cons_seq(stat.init);
                            else {
                                stat.init = prev.body;
                                n--;
                                CHANGED = true;
                            }
                        }
                    }
                } else if (stat instanceof AST_ForIn) {
                    if (!(stat.init instanceof AST_Const) && !(stat.init instanceof AST_Let)) {
                        stat.object = cons_seq(stat.object);
                    }
                } else if (stat instanceof AST_If) {
                    stat.condition = cons_seq(stat.condition);
                } else if (stat instanceof AST_Switch) {
                    stat.expression = cons_seq(stat.expression);
                } else if (stat instanceof AST_With) {
                    stat.expression = cons_seq(stat.expression);
                }
            }
            if (compressor.option("conditionals") && stat instanceof AST_If) {
                var decls = [];
                var body = to_simple_statement(stat.body, decls);
                var alt = to_simple_statement(stat.alternative, decls);
                if (body !== false && alt !== false && decls.length > 0) {
                    var len = decls.length;
                    decls.push(make_node(AST_If, stat, {
                        condition: stat.condition,
                        body: body || make_node(AST_EmptyStatement, stat.body),
                        alternative: alt
                    }));
                    decls.unshift(n, 1);
                    [].splice.apply(statements, decls);
                    i += len;
                    n += len + 1;
                    prev = null;
                    CHANGED = true;
                    continue;
                }
            }
            statements[n++] = stat;
            prev = stat instanceof AST_SimpleStatement ? stat : null;
        }
        statements.length = n;
    }

    function join_object_assignments(defn, body) {
        if (!(defn instanceof AST_Definitions))
            return;
        var def = defn.definitions[defn.definitions.length - 1];
        if (!(def.value instanceof AST_Object))
            return;
        var exprs;
        if (body instanceof AST_Assign && !body.logical) {
            exprs = [body];
        } else if (body instanceof AST_Sequence) {
            exprs = body.expressions.slice();
        }
        if (!exprs)
            return;
        var trimmed = false;
        do {
            var node = exprs[0];
            if (!(node instanceof AST_Assign))
                break;
            if (node.operator != "=")
                break;
            if (!(node.left instanceof AST_PropAccess))
                break;
            var sym = node.left.expression;
            if (!(sym instanceof AST_SymbolRef))
                break;
            if (def.name.name != sym.name)
                break;
            if (!node.right.is_constant_expression(scope))
                break;
            var prop = node.left.property;
            if (prop instanceof AST_Node) {
                prop = prop.evaluate(compressor);
            }
            if (prop instanceof AST_Node)
                break;
            prop = "" + prop;
            var diff = compressor.option("ecma") < 2015
                && compressor.has_directive("use strict") ? function (node) {
                    return node.key != prop && (node.key && node.key.name != prop);
                } : function (node) {
                    return node.key && node.key.name != prop;
                };
            if (!def.value.properties.every(diff))
                break;
            var p = def.value.properties.filter(function (p) { return p.key === prop; })[0];
            if (!p) {
                def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
                    key: prop,
                    value: node.right
                }));
            } else {
                p.value = new AST_Sequence({
                    start: p.start,
                    expressions: [p.value.clone(), node.right.clone()],
                    end: p.end
                });
            }
            exprs.shift();
            trimmed = true;
        } while (exprs.length);
        return trimmed && exprs;
    }

    function join_consecutive_vars(statements) {
        var defs;
        for (var i = 0, j = -1, len = statements.length; i < len; i++) {
            var stat = statements[i];
            var prev = statements[j];
            if (stat instanceof AST_Definitions) {
                if (prev && prev.TYPE == stat.TYPE) {
                    prev.definitions = prev.definitions.concat(stat.definitions);
                    CHANGED = true;
                } else if (defs && defs.TYPE == stat.TYPE && declarations_only(stat)) {
                    defs.definitions = defs.definitions.concat(stat.definitions);
                    CHANGED = true;
                } else {
                    statements[++j] = stat;
                    defs = stat;
                }
            } else if (stat instanceof AST_Exit) {
                stat.value = extract_object_assignments(stat.value);
            } else if (stat instanceof AST_For) {
                var exprs = join_object_assignments(prev, stat.init);
                if (exprs) {
                    CHANGED = true;
                    stat.init = exprs.length ? make_sequence(stat.init, exprs) : null;
                    statements[++j] = stat;
                } else if (prev instanceof AST_Var && (!stat.init || stat.init.TYPE == prev.TYPE)) {
                    if (stat.init) {
                        prev.definitions = prev.definitions.concat(stat.init.definitions);
                    }
                    stat.init = prev;
                    statements[j] = stat;
                    CHANGED = true;
                } else if (defs && stat.init && defs.TYPE == stat.init.TYPE && declarations_only(stat.init)) {
                    defs.definitions = defs.definitions.concat(stat.init.definitions);
                    stat.init = null;
                    statements[++j] = stat;
                    CHANGED = true;
                } else {
                    statements[++j] = stat;
                }
            } else if (stat instanceof AST_ForIn) {
                stat.object = extract_object_assignments(stat.object);
            } else if (stat instanceof AST_If) {
                stat.condition = extract_object_assignments(stat.condition);
            } else if (stat instanceof AST_SimpleStatement) {
                var exprs = join_object_assignments(prev, stat.body);
                if (exprs) {
                    CHANGED = true;
                    if (!exprs.length)
                        continue;
                    stat.body = make_sequence(stat.body, exprs);
                }
                statements[++j] = stat;
            } else if (stat instanceof AST_Switch) {
                stat.expression = extract_object_assignments(stat.expression);
            } else if (stat instanceof AST_With) {
                stat.expression = extract_object_assignments(stat.expression);
            } else {
                statements[++j] = stat;
            }
        }
        statements.length = j + 1;

        function extract_object_assignments(value) {
            statements[++j] = stat;
            var exprs = join_object_assignments(prev, value);
            if (exprs) {
                CHANGED = true;
                if (exprs.length) {
                    return make_sequence(value, exprs);
                } else if (value instanceof AST_Sequence) {
                    return value.tail_node().left;
                } else {
                    return value.left;
                }
            }
            return value;
        }
    }
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/


function within_array_or_object_literal(compressor) {
    var node, level = 0;
    while (node = compressor.parent(level++)) {
        if (node instanceof AST_Statement) return false;
        if (node instanceof AST_Array
            || node instanceof AST_ObjectKeyVal
            || node instanceof AST_Object) {
            return true;
        }
    }
    return false;
}

function scope_encloses_variables_in_this_scope(scope, pulled_scope) {
    for (const enclosed of pulled_scope.enclosed) {
        if (pulled_scope.variables.has(enclosed.name)) {
            continue;
        }
        const looked_up = scope.find_variable(enclosed.name);
        if (looked_up) {
            if (looked_up === enclosed) continue;
            return true;
        }
    }
    return false;
}

function inline_into_symbolref(self, compressor) {
    if (
        !compressor.option("ie8")
        && is_undeclared_ref(self)
        && !compressor.find_parent(AST_With)
    ) {
        switch (self.name) {
          case "undefined":
            return make_node(AST_Undefined, self).optimize(compressor);
          case "NaN":
            return make_node(AST_NaN, self).optimize(compressor);
          case "Infinity":
            return make_node(AST_Infinity, self).optimize(compressor);
        }
    }

    const parent = compressor.parent();
    if (compressor.option("reduce_vars") && is_lhs(self, parent) !== self) {
        const def = self.definition();
        const nearest_scope = compressor.find_scope();
        if (compressor.top_retain && def.global && compressor.top_retain(def)) {
            def.fixed = false;
            def.single_use = false;
            return self;
        }

        let fixed = self.fixed_value();
        let single_use = def.single_use
            && !(parent instanceof AST_Call
                && (parent.is_callee_pure(compressor))
                    || has_annotation(parent, _NOINLINE))
            && !(parent instanceof AST_Export
                && fixed instanceof AST_Lambda
                && fixed.name);

        if (single_use && fixed instanceof AST_Node) {
            single_use =
                !fixed.has_side_effects(compressor)
                && !fixed.may_throw(compressor);
        }

        if (single_use && (fixed instanceof AST_Lambda || fixed instanceof AST_Class)) {
            if (retain_top_func(fixed, compressor)) {
                single_use = false;
            } else if (def.scope !== self.scope
                && (def.escaped == 1
                    || has_flag(fixed, INLINED)
                    || within_array_or_object_literal(compressor)
                    || !compressor.option("reduce_funcs"))) {
                single_use = false;
            } else if (is_recursive_ref(compressor, def)) {
                single_use = false;
            } else if (def.scope !== self.scope || def.orig[0] instanceof AST_SymbolFunarg) {
                single_use = fixed.is_constant_expression(self.scope);
                if (single_use == "f") {
                    var scope = self.scope;
                    do {
                        if (scope instanceof AST_Defun || is_func_expr(scope)) {
                            set_flag(scope, INLINED);
                        }
                    } while (scope = scope.parent_scope);
                }
            }
        }

        if (single_use && (fixed instanceof AST_Lambda || fixed instanceof AST_Class)) {
            single_use =
                def.scope === self.scope
                    && !scope_encloses_variables_in_this_scope(nearest_scope, fixed)
                || parent instanceof AST_Call
                    && parent.expression === self
                    && !scope_encloses_variables_in_this_scope(nearest_scope, fixed)
                    && !(fixed.name && fixed.name.definition().recursive_refs > 0);
        }

        if (single_use && fixed) {
            if (fixed instanceof AST_DefClass) {
                set_flag(fixed, SQUEEZED);
                fixed = make_node(AST_ClassExpression, fixed, fixed);
            }
            if (fixed instanceof AST_Defun) {
                set_flag(fixed, SQUEEZED);
                fixed = make_node(AST_Function, fixed, fixed);
            }
            if (def.recursive_refs > 0 && fixed.name instanceof AST_SymbolDefun) {
                const defun_def = fixed.name.definition();
                let lambda_def = fixed.variables.get(fixed.name.name);
                let name = lambda_def && lambda_def.orig[0];
                if (!(name instanceof AST_SymbolLambda)) {
                    name = make_node(AST_SymbolLambda, fixed.name, fixed.name);
                    name.scope = fixed;
                    fixed.name = name;
                    lambda_def = fixed.def_function(name);
                }
                walk(fixed, node => {
                    if (node instanceof AST_SymbolRef && node.definition() === defun_def) {
                        node.thedef = lambda_def;
                        lambda_def.references.push(node);
                    }
                });
            }
            if (
                (fixed instanceof AST_Lambda || fixed instanceof AST_Class)
                && fixed.parent_scope !== nearest_scope
            ) {
                fixed = fixed.clone(true, compressor.get_toplevel());

                nearest_scope.add_child_scope(fixed);
            }
            return fixed.optimize(compressor);
        }

        // multiple uses
        if (fixed) {
            let replace;

            if (fixed instanceof AST_This) {
                if (!(def.orig[0] instanceof AST_SymbolFunarg)
                    && def.references.every((ref) =>
                        def.scope === ref.scope
                    )) {
                    replace = fixed;
                }
            } else {
                var ev = fixed.evaluate(compressor);
                if (
                    ev !== fixed
                    && (compressor.option("unsafe_regexp") || !(ev instanceof RegExp))
                ) {
                    replace = make_node_from_constant(ev, fixed);
                }
            }

            if (replace) {
                const name_length = self.size(compressor);
                const replace_size = replace.size(compressor);

                let overhead = 0;
                if (compressor.option("unused") && !compressor.exposed(def)) {
                    overhead =
                        (name_length + 2 + replace_size) /
                        (def.references.length - def.assignments);
                }

                if (replace_size <= name_length + overhead) {
                    return replace;
                }
            }
        }
    }

    return self;
}

function inline_into_call(self, fn, compressor) {
    var exp = self.expression;
    var simple_args = self.args.every((arg) => !(arg instanceof AST_Expansion));

    if (compressor.option("reduce_vars")
        && fn instanceof AST_SymbolRef
        && !has_annotation(self, _NOINLINE)
    ) {
        const fixed = fn.fixed_value();
        if (!retain_top_func(fixed, compressor)) {
            fn = fixed;
        }
    }

    var is_func = fn instanceof AST_Lambda;

    var stat = is_func && fn.body[0];
    var is_regular_func = is_func && !fn.is_generator && !fn.async;
    var can_inline = is_regular_func && compressor.option("inline") && !self.is_callee_pure(compressor);
    if (can_inline && stat instanceof AST_Return) {
        let returned = stat.value;
        if (!returned || returned.is_constant_expression()) {
            if (returned) {
                returned = returned.clone(true);
            } else {
                returned = make_node(AST_Undefined, self);
            }
            const args = self.args.concat(returned);
            return make_sequence(self, args).optimize(compressor);
        }

        // optimize identity function
        if (
            fn.argnames.length === 1
            && (fn.argnames[0] instanceof AST_SymbolFunarg)
            && self.args.length < 2
            && !(self.args[0] instanceof AST_Expansion)
            && returned instanceof AST_SymbolRef
            && returned.name === fn.argnames[0].name
        ) {
            const replacement =
                (self.args[0] || make_node(AST_Undefined)).optimize(compressor);

            let parent;
            if (
                replacement instanceof AST_PropAccess
                && (parent = compressor.parent()) instanceof AST_Call
                && parent.expression === self
            ) {
                // identity function was being used to remove `this`, like in
                //
                // id(bag.no_this)(...)
                //
                // Replace with a larger but more effish (0, bag.no_this) wrapper.

                return make_sequence(self, [
                    make_node(AST_Number, self, { value: 0 }),
                    replacement
                ]);
            }
            // replace call with first argument or undefined if none passed
            return replacement;
        }
    }

    if (can_inline) {
        var scope, in_loop, level = -1;
        let def;
        let returned_value;
        let nearest_scope;
        if (simple_args
            && !fn.uses_arguments
            && !(compressor.parent() instanceof AST_Class)
            && !(fn.name && fn instanceof AST_Function)
            && (returned_value = can_flatten_body(stat))
            && (exp === fn
                || has_annotation(self, _INLINE)
                || compressor.option("unused")
                    && (def = exp.definition()).references.length == 1
                    && !is_recursive_ref(compressor, def)
                    && fn.is_constant_expression(exp.scope))
            && !has_annotation(self, _PURE | _NOINLINE)
            && !fn.contains_this()
            && can_inject_symbols()
            && (nearest_scope = compressor.find_scope())
            && !scope_encloses_variables_in_this_scope(nearest_scope, fn)
            && !(function in_default_assign() {
                    // Due to the fact function parameters have their own scope
                    // which can't use `var something` in the function body within,
                    // we simply don't inline into DefaultAssign.
                    let i = 0;
                    let p;
                    while ((p = compressor.parent(i++))) {
                        if (p instanceof AST_DefaultAssign) return true;
                        if (p instanceof AST_Block) break;
                    }
                    return false;
                })()
            && !(scope instanceof AST_Class)
        ) {
            set_flag(fn, SQUEEZED);
            nearest_scope.add_child_scope(fn);
            return make_sequence(self, flatten_fn(returned_value)).optimize(compressor);
        }
    }

    if (can_inline && has_annotation(self, _INLINE)) {
        set_flag(fn, SQUEEZED);
        fn = make_node(fn.CTOR === AST_Defun ? AST_Function : fn.CTOR, fn, fn);
        fn = fn.clone(true);
        fn.figure_out_scope({}, {
            parent_scope: compressor.find_scope(),
            toplevel: compressor.get_toplevel()
        });

        return make_node(AST_Call, self, {
            expression: fn,
            args: self.args,
        }).optimize(compressor);
    }

    const can_drop_this_call = is_regular_func && compressor.option("side_effects") && fn.body.every(is_empty);
    if (can_drop_this_call) {
        var args = self.args.concat(make_node(AST_Undefined, self));
        return make_sequence(self, args).optimize(compressor);
    }

    if (compressor.option("negate_iife")
        && compressor.parent() instanceof AST_SimpleStatement
        && is_iife_call(self)) {
        return self.negate(compressor, true);
    }

    var ev = self.evaluate(compressor);
    if (ev !== self) {
        ev = make_node_from_constant(ev, self).optimize(compressor);
        return best_of(compressor, ev, self);
    }

    return self;

    function return_value(stat) {
        if (!stat) return make_node(AST_Undefined, self);
        if (stat instanceof AST_Return) {
            if (!stat.value) return make_node(AST_Undefined, self);
            return stat.value.clone(true);
        }
        if (stat instanceof AST_SimpleStatement) {
            return make_node(AST_UnaryPrefix, stat, {
                operator: "void",
                expression: stat.body.clone(true)
            });
        }
    }

    function can_flatten_body(stat) {
        var body = fn.body;
        var len = body.length;
        if (compressor.option("inline") < 3) {
            return len == 1 && return_value(stat);
        }
        stat = null;
        for (var i = 0; i < len; i++) {
            var line = body[i];
            if (line instanceof AST_Var) {
                if (stat && !line.definitions.every((var_def) =>
                    !var_def.value
                )) {
                    return false;
                }
            } else if (stat) {
                return false;
            } else if (!(line instanceof AST_EmptyStatement)) {
                stat = line;
            }
        }
        return return_value(stat);
    }

    function can_inject_args(block_scoped, safe_to_inject) {
        for (var i = 0, len = fn.argnames.length; i < len; i++) {
            var arg = fn.argnames[i];
            if (arg instanceof AST_DefaultAssign) {
                if (has_flag(arg.left, UNUSED)) continue;
                return false;
            }
            if (arg instanceof AST_Destructuring) return false;
            if (arg instanceof AST_Expansion) {
                if (has_flag(arg.expression, UNUSED)) continue;
                return false;
            }
            if (has_flag(arg, UNUSED)) continue;
            if (!safe_to_inject
                || block_scoped.has(arg.name)
                || identifier_atom.has(arg.name)
                || scope.conflicting_def(arg.name)) {
                return false;
            }
            if (in_loop) in_loop.push(arg.definition());
        }
        return true;
    }

    function can_inject_vars(block_scoped, safe_to_inject) {
        var len = fn.body.length;
        for (var i = 0; i < len; i++) {
            var stat = fn.body[i];
            if (!(stat instanceof AST_Var)) continue;
            if (!safe_to_inject) return false;
            for (var j = stat.definitions.length; --j >= 0;) {
                var name = stat.definitions[j].name;
                if (name instanceof AST_Destructuring
                    || block_scoped.has(name.name)
                    || identifier_atom.has(name.name)
                    || scope.conflicting_def(name.name)) {
                    return false;
                }
                if (in_loop) in_loop.push(name.definition());
            }
        }
        return true;
    }

    function can_inject_symbols() {
        var block_scoped = new Set();
        do {
            scope = compressor.parent(++level);
            if (scope.is_block_scope() && scope.block_scope) {
                // TODO this is sometimes undefined during compression.
                // But it should always have a value!
                scope.block_scope.variables.forEach(function (variable) {
                    block_scoped.add(variable.name);
                });
            }
            if (scope instanceof AST_Catch) {
                // TODO can we delete? AST_Catch is a block scope.
                if (scope.argname) {
                    block_scoped.add(scope.argname.name);
                }
            } else if (scope instanceof AST_IterationStatement) {
                in_loop = [];
            } else if (scope instanceof AST_SymbolRef) {
                if (scope.fixed_value() instanceof AST_Scope) return false;
            }
        } while (!(scope instanceof AST_Scope));

        var safe_to_inject = !(scope instanceof AST_Toplevel) || compressor.toplevel.vars;
        var inline = compressor.option("inline");
        if (!can_inject_vars(block_scoped, inline >= 3 && safe_to_inject)) return false;
        if (!can_inject_args(block_scoped, inline >= 2 && safe_to_inject)) return false;
        return !in_loop || in_loop.length == 0 || !is_reachable(fn, in_loop);
    }

    function append_var(decls, expressions, name, value) {
        var def = name.definition();

        // Name already exists, only when a function argument had the same name
        const already_appended = scope.variables.has(name.name);
        if (!already_appended) {
            scope.variables.set(name.name, def);
            scope.enclosed.push(def);
            decls.push(make_node(AST_VarDef, name, {
                name: name,
                value: null
            }));
        }

        var sym = make_node(AST_SymbolRef, name, name);
        def.references.push(sym);
        if (value) expressions.push(make_node(AST_Assign, self, {
            operator: "=",
            logical: false,
            left: sym,
            right: value.clone()
        }));
    }

    function flatten_args(decls, expressions) {
        var len = fn.argnames.length;
        for (var i = self.args.length; --i >= len;) {
            expressions.push(self.args[i]);
        }
        for (i = len; --i >= 0;) {
            var name = fn.argnames[i];
            var value = self.args[i];
            if (has_flag(name, UNUSED) || !name.name || scope.conflicting_def(name.name)) {
                if (value) expressions.push(value);
            } else {
                var symbol = make_node(AST_SymbolVar, name, name);
                name.definition().orig.push(symbol);
                if (!value && in_loop) value = make_node(AST_Undefined, self);
                append_var(decls, expressions, symbol, value);
            }
        }
        decls.reverse();
        expressions.reverse();
    }

    function flatten_vars(decls, expressions) {
        var pos = expressions.length;
        for (var i = 0, lines = fn.body.length; i < lines; i++) {
            var stat = fn.body[i];
            if (!(stat instanceof AST_Var)) continue;
            for (var j = 0, defs = stat.definitions.length; j < defs; j++) {
                var var_def = stat.definitions[j];
                var name = var_def.name;
                append_var(decls, expressions, name, var_def.value);
                if (in_loop && fn.argnames.every((argname) =>
                    argname.name != name.name
                )) {
                    var def = fn.variables.get(name.name);
                    var sym = make_node(AST_SymbolRef, name, name);
                    def.references.push(sym);
                    expressions.splice(pos++, 0, make_node(AST_Assign, var_def, {
                        operator: "=",
                        logical: false,
                        left: sym,
                        right: make_node(AST_Undefined, name)
                    }));
                }
            }
        }
    }

    function flatten_fn(returned_value) {
        var decls = [];
        var expressions = [];
        flatten_args(decls, expressions);
        flatten_vars(decls, expressions);
        expressions.push(returned_value);

        if (decls.length) {
            const i = scope.body.indexOf(compressor.parent(level - 1)) + 1;
            scope.body.splice(i, 0, make_node(AST_Var, fn, {
                definitions: decls
            }));
        }

        return expressions.map(exp => exp.clone(true));
    }
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

class Compressor extends TreeWalker {
    constructor(options, { false_by_default = false, mangle_options = false }) {
        super();
        if (options.defaults !== undefined && !options.defaults) false_by_default = true;
        this.options = defaults(options, {
            arguments     : false,
            arrows        : !false_by_default,
            booleans      : !false_by_default,
            booleans_as_integers : false,
            collapse_vars : !false_by_default,
            comparisons   : !false_by_default,
            computed_props: !false_by_default,
            conditionals  : !false_by_default,
            dead_code     : !false_by_default,
            defaults      : true,
            directives    : !false_by_default,
            drop_console  : false,
            drop_debugger : !false_by_default,
            ecma          : 5,
            evaluate      : !false_by_default,
            expression    : false,
            global_defs   : false,
            hoist_funs    : false,
            hoist_props   : !false_by_default,
            hoist_vars    : false,
            ie8           : false,
            if_return     : !false_by_default,
            inline        : !false_by_default,
            join_vars     : !false_by_default,
            keep_classnames: false,
            keep_fargs    : true,
            keep_fnames   : false,
            keep_infinity : false,
            loops         : !false_by_default,
            module        : false,
            negate_iife   : !false_by_default,
            passes        : 1,
            properties    : !false_by_default,
            pure_getters  : !false_by_default && "strict",
            pure_funcs    : null,
            reduce_funcs  : !false_by_default,
            reduce_vars   : !false_by_default,
            sequences     : !false_by_default,
            side_effects  : !false_by_default,
            switches      : !false_by_default,
            top_retain    : null,
            toplevel      : !!(options && options["top_retain"]),
            typeofs       : !false_by_default,
            unsafe        : false,
            unsafe_arrows : false,
            unsafe_comps  : false,
            unsafe_Function: false,
            unsafe_math   : false,
            unsafe_symbols: false,
            unsafe_methods: false,
            unsafe_proto  : false,
            unsafe_regexp : false,
            unsafe_undefined: false,
            unused        : !false_by_default,
            warnings      : false  // legacy
        }, true);
        var global_defs = this.options["global_defs"];
        if (typeof global_defs == "object") for (var key in global_defs) {
            if (key[0] === "@" && HOP(global_defs, key)) {
                global_defs[key.slice(1)] = parse(global_defs[key], {
                    expression: true
                });
            }
        }
        if (this.options["inline"] === true) this.options["inline"] = 3;
        var pure_funcs = this.options["pure_funcs"];
        if (typeof pure_funcs == "function") {
            this.pure_funcs = pure_funcs;
        } else {
            this.pure_funcs = pure_funcs ? function(node) {
                return !pure_funcs.includes(node.expression.print_to_string());
            } : return_true;
        }
        var top_retain = this.options["top_retain"];
        if (top_retain instanceof RegExp) {
            this.top_retain = function(def) {
                return top_retain.test(def.name);
            };
        } else if (typeof top_retain == "function") {
            this.top_retain = top_retain;
        } else if (top_retain) {
            if (typeof top_retain == "string") {
                top_retain = top_retain.split(/,/);
            }
            this.top_retain = function(def) {
                return top_retain.includes(def.name);
            };
        }
        if (this.options["module"]) {
            this.directives["use strict"] = true;
            this.options["toplevel"] = true;
        }
        var toplevel = this.options["toplevel"];
        this.toplevel = typeof toplevel == "string" ? {
            funcs: /funcs/.test(toplevel),
            vars: /vars/.test(toplevel)
        } : {
            funcs: toplevel,
            vars: toplevel
        };
        var sequences = this.options["sequences"];
        this.sequences_limit = sequences == 1 ? 800 : sequences | 0;
        this.evaluated_regexps = new Map();
        this._toplevel = undefined;
        this.mangle_options = mangle_options;
    }

    option(key) {
        return this.options[key];
    }

    exposed(def) {
        if (def.export) return true;
        if (def.global) for (var i = 0, len = def.orig.length; i < len; i++)
            if (!this.toplevel[def.orig[i] instanceof AST_SymbolDefun ? "funcs" : "vars"])
                return true;
        return false;
    }

    in_boolean_context() {
        if (!this.option("booleans")) return false;
        var self = this.self();
        for (var i = 0, p; p = this.parent(i); i++) {
            if (p instanceof AST_SimpleStatement
                || p instanceof AST_Conditional && p.condition === self
                || p instanceof AST_DWLoop && p.condition === self
                || p instanceof AST_For && p.condition === self
                || p instanceof AST_If && p.condition === self
                || p instanceof AST_UnaryPrefix && p.operator == "!" && p.expression === self) {
                return true;
            }
            if (
                p instanceof AST_Binary
                    && (
                        p.operator == "&&"
                        || p.operator == "||"
                        || p.operator == "??"
                    )
                || p instanceof AST_Conditional
                || p.tail_node() === self
            ) {
                self = p;
            } else {
                return false;
            }
        }
    }

    get_toplevel() {
        return this._toplevel;
    }

    compress(toplevel) {
        toplevel = toplevel.resolve_defines(this);
        this._toplevel = toplevel;
        if (this.option("expression")) {
            this._toplevel.process_expression(true);
        }
        var passes = +this.options.passes || 1;
        var min_count = 1 / 0;
        var stopping = false;
        var nth_identifier = this.mangle_options && this.mangle_options.nth_identifier || base54;
        var mangle = { ie8: this.option("ie8"), nth_identifier: nth_identifier };
        for (var pass = 0; pass < passes; pass++) {
            this._toplevel.figure_out_scope(mangle);
            if (pass === 0 && this.option("drop_console")) {
                // must be run before reduce_vars and compress pass
                this._toplevel = this._toplevel.drop_console();
            }
            if (pass > 0 || this.option("reduce_vars")) {
                this._toplevel.reset_opt_flags(this);
            }
            this._toplevel = this._toplevel.transform(this);
            if (passes > 1) {
                let count = 0;
                walk(this._toplevel, () => { count++; });
                if (count < min_count) {
                    min_count = count;
                    stopping = false;
                } else if (stopping) {
                    break;
                } else {
                    stopping = true;
                }
            }
        }
        if (this.option("expression")) {
            this._toplevel.process_expression(false);
        }
        toplevel = this._toplevel;
        this._toplevel = undefined;
        return toplevel;
    }

    before(node, descend) {
        if (has_flag(node, SQUEEZED)) return node;
        var was_scope = false;
        if (node instanceof AST_Scope) {
            node = node.hoist_properties(this);
            node = node.hoist_declarations(this);
            was_scope = true;
        }
        // Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
        // would call AST_Node.transform() if a different instance of AST_Node is
        // produced after def_optimize().
        // This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
        // Migrate and defer all children's AST_Node.transform() to below, which
        // will now happen after this parent AST_Node has been properly substituted
        // thus gives a consistent AST snapshot.
        descend(node, this);
        // Existing code relies on how AST_Node.optimize() worked, and omitting the
        // following replacement call would result in degraded efficiency of both
        // output and performance.
        descend(node, this);
        var opt = node.optimize(this);
        if (was_scope && opt instanceof AST_Scope) {
            opt.drop_unused(this);
            descend(opt, this);
        }
        if (opt === node) set_flag(opt, SQUEEZED);
        return opt;
    }
}

function def_optimize(node, optimizer) {
    node.DEFMETHOD("optimize", function(compressor) {
        var self = this;
        if (has_flag(self, OPTIMIZED)) return self;
        if (compressor.has_directive("use asm")) return self;
        var opt = optimizer(self, compressor);
        set_flag(opt, OPTIMIZED);
        return opt;
    });
}

def_optimize(AST_Node, function(self) {
    return self;
});

AST_Toplevel.DEFMETHOD("drop_console", function() {
    return this.transform(new TreeTransformer(function(self) {
        if (self.TYPE == "Call") {
            var exp = self.expression;
            if (exp instanceof AST_PropAccess) {
                var name = exp.expression;
                while (name.expression) {
                    name = name.expression;
                }
                if (is_undeclared_ref(name) && name.name == "console") {
                    return make_node(AST_Undefined, self);
                }
            }
        }
    }));
});

AST_Node.DEFMETHOD("equivalent_to", function(node) {
    return equivalent_to(this, node);
});

AST_Scope.DEFMETHOD("process_expression", function(insert, compressor) {
    var self = this;
    var tt = new TreeTransformer(function(node) {
        if (insert && node instanceof AST_SimpleStatement) {
            return make_node(AST_Return, node, {
                value: node.body
            });
        }
        if (!insert && node instanceof AST_Return) {
            if (compressor) {
                var value = node.value && node.value.drop_side_effect_free(compressor, true);
                return value
                    ? make_node(AST_SimpleStatement, node, { body: value })
                    : make_node(AST_EmptyStatement, node);
            }
            return make_node(AST_SimpleStatement, node, {
                body: node.value || make_node(AST_UnaryPrefix, node, {
                    operator: "void",
                    expression: make_node(AST_Number, node, {
                        value: 0
                    })
                })
            });
        }
        if (node instanceof AST_Class || node instanceof AST_Lambda && node !== self) {
            return node;
        }
        if (node instanceof AST_Block) {
            var index = node.body.length - 1;
            if (index >= 0) {
                node.body[index] = node.body[index].transform(tt);
            }
        } else if (node instanceof AST_If) {
            node.body = node.body.transform(tt);
            if (node.alternative) {
                node.alternative = node.alternative.transform(tt);
            }
        } else if (node instanceof AST_With) {
            node.body = node.body.transform(tt);
        }
        return node;
    });
    self.transform(tt);
});

AST_Toplevel.DEFMETHOD("reset_opt_flags", function(compressor) {
    const self = this;
    const reduce_vars = compressor.option("reduce_vars");

    const preparation = new TreeWalker(function(node, descend) {
        clear_flag(node, CLEAR_BETWEEN_PASSES);
        if (reduce_vars) {
            if (compressor.top_retain
                && node instanceof AST_Defun  // Only functions are retained
                && preparation.parent() === self
            ) {
                set_flag(node, TOP);
            }
            return node.reduce_vars(preparation, descend, compressor);
        }
    });
    // Stack of look-up tables to keep track of whether a `SymbolDef` has been
    // properly assigned before use:
    // - `push()` & `pop()` when visiting conditional branches
    preparation.safe_ids = Object.create(null);
    preparation.in_loop = null;
    preparation.loop_ids = new Map();
    preparation.defs_to_safe_ids = new Map();
    self.walk(preparation);
});

AST_Symbol.DEFMETHOD("fixed_value", function() {
    var fixed = this.thedef.fixed;
    if (!fixed || fixed instanceof AST_Node) return fixed;
    return fixed();
});

AST_SymbolRef.DEFMETHOD("is_immutable", function() {
    var orig = this.definition().orig;
    return orig.length == 1 && orig[0] instanceof AST_SymbolLambda;
});

function find_variable(compressor, name) {
    var scope, i = 0;
    while (scope = compressor.parent(i++)) {
        if (scope instanceof AST_Scope) break;
        if (scope instanceof AST_Catch && scope.argname) {
            scope = scope.argname.definition().scope;
            break;
        }
    }
    return scope.find_variable(name);
}

var global_names = makePredicate("Array Boolean clearInterval clearTimeout console Date decodeURI decodeURIComponent encodeURI encodeURIComponent Error escape eval EvalError Function isFinite isNaN JSON Math Number parseFloat parseInt RangeError ReferenceError RegExp Object setInterval setTimeout String SyntaxError TypeError unescape URIError");
AST_SymbolRef.DEFMETHOD("is_declared", function(compressor) {
    return !this.definition().undeclared
        || compressor.option("unsafe") && global_names.has(this.name);
});

/* -----[ optimizers ]----- */

var directives = new Set(["use asm", "use strict"]);
def_optimize(AST_Directive, function(self, compressor) {
    if (compressor.option("directives")
        && (!directives.has(self.value) || compressor.has_directive(self.value) !== self)) {
        return make_node(AST_EmptyStatement, self);
    }
    return self;
});

def_optimize(AST_Debugger, function(self, compressor) {
    if (compressor.option("drop_debugger"))
        return make_node(AST_EmptyStatement, self);
    return self;
});

def_optimize(AST_LabeledStatement, function(self, compressor) {
    if (self.body instanceof AST_Break
        && compressor.loopcontrol_target(self.body) === self.body) {
        return make_node(AST_EmptyStatement, self);
    }
    return self.label.references.length == 0 ? self.body : self;
});

def_optimize(AST_Block, function(self, compressor) {
    tighten_body(self.body, compressor);
    return self;
});

function can_be_extracted_from_if_block(node) {
    return !(
        node instanceof AST_Const
        || node instanceof AST_Let
        || node instanceof AST_Class
    );
}

def_optimize(AST_BlockStatement, function(self, compressor) {
    tighten_body(self.body, compressor);
    switch (self.body.length) {
      case 1:
        if (!compressor.has_directive("use strict")
            && compressor.parent() instanceof AST_If
            && can_be_extracted_from_if_block(self.body[0])
            || can_be_evicted_from_block(self.body[0])) {
            return self.body[0];
        }
        break;
      case 0: return make_node(AST_EmptyStatement, self);
    }
    return self;
});

function opt_AST_Lambda(self, compressor) {
    tighten_body(self.body, compressor);
    if (compressor.option("side_effects")
        && self.body.length == 1
        && self.body[0] === compressor.has_directive("use strict")) {
        self.body.length = 0;
    }
    return self;
}
def_optimize(AST_Lambda, opt_AST_Lambda);

const r_keep_assign = /keep_assign/;
AST_Scope.DEFMETHOD("drop_unused", function(compressor) {
    if (!compressor.option("unused")) return;
    if (compressor.has_directive("use asm")) return;
    var self = this;
    if (self.pinned()) return;
    var drop_funcs = !(self instanceof AST_Toplevel) || compressor.toplevel.funcs;
    var drop_vars = !(self instanceof AST_Toplevel) || compressor.toplevel.vars;
    const assign_as_unused = r_keep_assign.test(compressor.option("unused")) ? return_false : function(node) {
        if (node instanceof AST_Assign
            && !node.logical
            && (has_flag(node, WRITE_ONLY) || node.operator == "=")
        ) {
            return node.left;
        }
        if (node instanceof AST_Unary && has_flag(node, WRITE_ONLY)) {
            return node.expression;
        }
    };
    var in_use_ids = new Map();
    var fixed_ids = new Map();
    if (self instanceof AST_Toplevel && compressor.top_retain) {
        self.variables.forEach(function(def) {
            if (compressor.top_retain(def) && !in_use_ids.has(def.id)) {
                in_use_ids.set(def.id, def);
            }
        });
    }
    var var_defs_by_id = new Map();
    var initializations = new Map();
    // pass 1: find out which symbols are directly used in
    // this scope (not in nested scopes).
    var scope = this;
    var tw = new TreeWalker(function(node, descend) {
        if (node instanceof AST_Lambda && node.uses_arguments && !tw.has_directive("use strict")) {
            node.argnames.forEach(function(argname) {
                if (!(argname instanceof AST_SymbolDeclaration)) return;
                var def = argname.definition();
                if (!in_use_ids.has(def.id)) {
                    in_use_ids.set(def.id, def);
                }
            });
        }
        if (node === self) return;
        if (node instanceof AST_Defun || node instanceof AST_DefClass) {
            var node_def = node.name.definition();
            const in_export = tw.parent() instanceof AST_Export;
            if (in_export || !drop_funcs && scope === self) {
                if (node_def.global && !in_use_ids.has(node_def.id)) {
                    in_use_ids.set(node_def.id, node_def);
                }
            }
            if (node instanceof AST_DefClass) {
                if (
                    node.extends
                    && (node.extends.has_side_effects(compressor)
                    || node.extends.may_throw(compressor))
                ) {
                    node.extends.walk(tw);
                }
                for (const prop of node.properties) {
                    if (
                        prop.has_side_effects(compressor) ||
                        prop.may_throw(compressor)
                    ) {
                        prop.walk(tw);
                    }
                }
            }
            map_add(initializations, node_def.id, node);
            return true; // don't go in nested scopes
        }
        if (node instanceof AST_SymbolFunarg && scope === self) {
            map_add(var_defs_by_id, node.definition().id, node);
        }
        if (node instanceof AST_Definitions && scope === self) {
            const in_export = tw.parent() instanceof AST_Export;
            node.definitions.forEach(function(def) {
                if (def.name instanceof AST_SymbolVar) {
                    map_add(var_defs_by_id, def.name.definition().id, def);
                }
                if (in_export || !drop_vars) {
                    walk(def.name, node => {
                        if (node instanceof AST_SymbolDeclaration) {
                            const def = node.definition();
                            if (
                                (in_export || def.global)
                                && !in_use_ids.has(def.id)
                            ) {
                                in_use_ids.set(def.id, def);
                            }
                        }
                    });
                }
                if (def.value) {
                    if (def.name instanceof AST_Destructuring) {
                        def.walk(tw);
                    } else {
                        var node_def = def.name.definition();
                        map_add(initializations, node_def.id, def.value);
                        if (!node_def.chained && def.name.fixed_value() === def.value) {
                            fixed_ids.set(node_def.id, def);
                        }
                    }
                    if (def.value.has_side_effects(compressor)) {
                        def.value.walk(tw);
                    }
                }
            });
            return true;
        }
        return scan_ref_scoped(node, descend);
    });
    self.walk(tw);
    // pass 2: for every used symbol we need to walk its
    // initialization code to figure out if it uses other
    // symbols (that may not be in_use).
    tw = new TreeWalker(scan_ref_scoped);
    in_use_ids.forEach(function (def) {
        var init = initializations.get(def.id);
        if (init) init.forEach(function(init) {
            init.walk(tw);
        });
    });
    // pass 3: we should drop declarations not in_use
    var tt = new TreeTransformer(
        function before(node, descend, in_list) {
            var parent = tt.parent();
            if (drop_vars) {
                const sym = assign_as_unused(node);
                if (sym instanceof AST_SymbolRef) {
                    var def = sym.definition();
                    var in_use = in_use_ids.has(def.id);
                    if (node instanceof AST_Assign) {
                        if (!in_use || fixed_ids.has(def.id) && fixed_ids.get(def.id) !== node) {
                            return maintain_this_binding(parent, node, node.right.transform(tt));
                        }
                    } else if (!in_use) return in_list ? MAP.skip : make_node(AST_Number, node, {
                        value: 0
                    });
                }
            }
            if (scope !== self) return;
            var def;
            if (node.name
                && (node instanceof AST_ClassExpression
                    && !keep_name(compressor.option("keep_classnames"), (def = node.name.definition()).name)
                || node instanceof AST_Function
                    && !keep_name(compressor.option("keep_fnames"), (def = node.name.definition()).name))) {
                // any declarations with same name will overshadow
                // name of this anonymous function and can therefore
                // never be used anywhere
                if (!in_use_ids.has(def.id) || def.orig.length > 1) node.name = null;
            }
            if (node instanceof AST_Lambda && !(node instanceof AST_Accessor)) {
                var trim = !compressor.option("keep_fargs");
                for (var a = node.argnames, i = a.length; --i >= 0;) {
                    var sym = a[i];
                    if (sym instanceof AST_Expansion) {
                        sym = sym.expression;
                    }
                    if (sym instanceof AST_DefaultAssign) {
                        sym = sym.left;
                    }
                    // Do not drop destructuring arguments.
                    // They constitute a type assertion, so dropping
                    // them would stop that TypeError which would happen
                    // if someone called it with an incorrectly formatted
                    // parameter.
                    if (!(sym instanceof AST_Destructuring) && !in_use_ids.has(sym.definition().id)) {
                        set_flag(sym, UNUSED);
                        if (trim) {
                            a.pop();
                        }
                    } else {
                        trim = false;
                    }
                }
            }
            if ((node instanceof AST_Defun || node instanceof AST_DefClass) && node !== self) {
                const def = node.name.definition();
                const keep = def.global && !drop_funcs || in_use_ids.has(def.id);
                // Class "extends" and static blocks may have side effects
                const has_side_effects = !keep
                    && node instanceof AST_Class
                    && node.has_side_effects(compressor);
                if (!keep && !has_side_effects) {
                    def.eliminated++;
                    return in_list ? MAP.skip : make_node(AST_EmptyStatement, node);
                }
            }
            if (node instanceof AST_Definitions && !(parent instanceof AST_ForIn && parent.init === node)) {
                var drop_block = !(parent instanceof AST_Toplevel) && !(node instanceof AST_Var);
                // place uninitialized names at the start
                var body = [], head = [], tail = [];
                // for unused names whose initialization has
                // side effects, we can cascade the init. code
                // into the next one, or next statement.
                var side_effects = [];
                node.definitions.forEach(function(def) {
                    if (def.value) def.value = def.value.transform(tt);
                    var is_destructure = def.name instanceof AST_Destructuring;
                    var sym = is_destructure
                        ? new SymbolDef(null, { name: "<destructure>" }) /* fake SymbolDef */
                        : def.name.definition();
                    if (drop_block && sym.global) return tail.push(def);
                    if (!(drop_vars || drop_block)
                        || is_destructure
                            && (def.name.names.length
                                || def.name.is_array
                                || compressor.option("pure_getters") != true)
                        || in_use_ids.has(sym.id)
                    ) {
                        if (def.value && fixed_ids.has(sym.id) && fixed_ids.get(sym.id) !== def) {
                            def.value = def.value.drop_side_effect_free(compressor);
                        }
                        if (def.name instanceof AST_SymbolVar) {
                            var var_defs = var_defs_by_id.get(sym.id);
                            if (var_defs.length > 1 && (!def.value || sym.orig.indexOf(def.name) > sym.eliminated)) {
                                if (def.value) {
                                    var ref = make_node(AST_SymbolRef, def.name, def.name);
                                    sym.references.push(ref);
                                    var assign = make_node(AST_Assign, def, {
                                        operator: "=",
                                        logical: false,
                                        left: ref,
                                        right: def.value
                                    });
                                    if (fixed_ids.get(sym.id) === def) {
                                        fixed_ids.set(sym.id, assign);
                                    }
                                    side_effects.push(assign.transform(tt));
                                }
                                remove(var_defs, def);
                                sym.eliminated++;
                                return;
                            }
                        }
                        if (def.value) {
                            if (side_effects.length > 0) {
                                if (tail.length > 0) {
                                    side_effects.push(def.value);
                                    def.value = make_sequence(def.value, side_effects);
                                } else {
                                    body.push(make_node(AST_SimpleStatement, node, {
                                        body: make_sequence(node, side_effects)
                                    }));
                                }
                                side_effects = [];
                            }
                            tail.push(def);
                        } else {
                            head.push(def);
                        }
                    } else if (sym.orig[0] instanceof AST_SymbolCatch) {
                        var value = def.value && def.value.drop_side_effect_free(compressor);
                        if (value) side_effects.push(value);
                        def.value = null;
                        head.push(def);
                    } else {
                        var value = def.value && def.value.drop_side_effect_free(compressor);
                        if (value) {
                            side_effects.push(value);
                        }
                        sym.eliminated++;
                    }
                });
                if (head.length > 0 || tail.length > 0) {
                    node.definitions = head.concat(tail);
                    body.push(node);
                }
                if (side_effects.length > 0) {
                    body.push(make_node(AST_SimpleStatement, node, {
                        body: make_sequence(node, side_effects)
                    }));
                }
                switch (body.length) {
                  case 0:
                    return in_list ? MAP.skip : make_node(AST_EmptyStatement, node);
                  case 1:
                    return body[0];
                  default:
                    return in_list ? MAP.splice(body) : make_node(AST_BlockStatement, node, {
                        body: body
                    });
                }
            }
            // certain combination of unused name + side effect leads to:
            //    https://github.com/mishoo/UglifyJS2/issues/44
            //    https://github.com/mishoo/UglifyJS2/issues/1830
            //    https://github.com/mishoo/UglifyJS2/issues/1838
            // that's an invalid AST.
            // We fix it at this stage by moving the `var` outside the `for`.
            if (node instanceof AST_For) {
                descend(node, this);
                var block;
                if (node.init instanceof AST_BlockStatement) {
                    block = node.init;
                    node.init = block.body.pop();
                    block.body.push(node);
                }
                if (node.init instanceof AST_SimpleStatement) {
                    node.init = node.init.body;
                } else if (is_empty(node.init)) {
                    node.init = null;
                }
                return !block ? node : in_list ? MAP.splice(block.body) : block;
            }
            if (node instanceof AST_LabeledStatement
                && node.body instanceof AST_For
            ) {
                descend(node, this);
                if (node.body instanceof AST_BlockStatement) {
                    var block = node.body;
                    node.body = block.body.pop();
                    block.body.push(node);
                    return in_list ? MAP.splice(block.body) : block;
                }
                return node;
            }
            if (node instanceof AST_BlockStatement) {
                descend(node, this);
                if (in_list && node.body.every(can_be_evicted_from_block)) {
                    return MAP.splice(node.body);
                }
                return node;
            }
            if (node instanceof AST_Scope) {
                const save_scope = scope;
                scope = node;
                descend(node, this);
                scope = save_scope;
                return node;
            }
        }
    );

    self.transform(tt);

    function scan_ref_scoped(node, descend) {
        var node_def;
        const sym = assign_as_unused(node);
        if (sym instanceof AST_SymbolRef
            && !is_ref_of(node.left, AST_SymbolBlockDeclaration)
            && self.variables.get(sym.name) === (node_def = sym.definition())
        ) {
            if (node instanceof AST_Assign) {
                node.right.walk(tw);
                if (!node_def.chained && node.left.fixed_value() === node.right) {
                    fixed_ids.set(node_def.id, node);
                }
            }
            return true;
        }
        if (node instanceof AST_SymbolRef) {
            node_def = node.definition();
            if (!in_use_ids.has(node_def.id)) {
                in_use_ids.set(node_def.id, node_def);
                if (node_def.orig[0] instanceof AST_SymbolCatch) {
                    const redef = node_def.scope.is_block_scope()
                        && node_def.scope.get_defun_scope().variables.get(node_def.name);
                    if (redef) in_use_ids.set(redef.id, redef);
                }
            }
            return true;
        }
        if (node instanceof AST_Scope) {
            var save_scope = scope;
            scope = node;
            descend();
            scope = save_scope;
            return true;
        }
    }
});

AST_Scope.DEFMETHOD("hoist_declarations", function(compressor) {
    var self = this;
    if (compressor.has_directive("use asm")) return self;
    // Hoisting makes no sense in an arrow func
    if (!Array.isArray(self.body)) return self;

    var hoist_funs = compressor.option("hoist_funs");
    var hoist_vars = compressor.option("hoist_vars");

    if (hoist_funs || hoist_vars) {
        var dirs = [];
        var hoisted = [];
        var vars = new Map(), vars_found = 0, var_decl = 0;
        // let's count var_decl first, we seem to waste a lot of
        // space if we hoist `var` when there's only one.
        walk(self, node => {
            if (node instanceof AST_Scope && node !== self)
                return true;
            if (node instanceof AST_Var) {
                ++var_decl;
                return true;
            }
        });
        hoist_vars = hoist_vars && var_decl > 1;
        var tt = new TreeTransformer(
            function before(node) {
                if (node !== self) {
                    if (node instanceof AST_Directive) {
                        dirs.push(node);
                        return make_node(AST_EmptyStatement, node);
                    }
                    if (hoist_funs && node instanceof AST_Defun
                        && !(tt.parent() instanceof AST_Export)
                        && tt.parent() === self) {
                        hoisted.push(node);
                        return make_node(AST_EmptyStatement, node);
                    }
                    if (
                        hoist_vars
                        && node instanceof AST_Var
                        && !node.definitions.some(def => def.name instanceof AST_Destructuring)
                    ) {
                        node.definitions.forEach(function(def) {
                            vars.set(def.name.name, def);
                            ++vars_found;
                        });
                        var seq = node.to_assignments(compressor);
                        var p = tt.parent();
                        if (p instanceof AST_ForIn && p.init === node) {
                            if (seq == null) {
                                var def = node.definitions[0].name;
                                return make_node(AST_SymbolRef, def, def);
                            }
                            return seq;
                        }
                        if (p instanceof AST_For && p.init === node) {
                            return seq;
                        }
                        if (!seq) return make_node(AST_EmptyStatement, node);
                        return make_node(AST_SimpleStatement, node, {
                            body: seq
                        });
                    }
                    if (node instanceof AST_Scope)
                        return node; // to avoid descending in nested scopes
                }
            }
        );
        self = self.transform(tt);
        if (vars_found > 0) {
            // collect only vars which don't show up in self's arguments list
            var defs = [];
            const is_lambda = self instanceof AST_Lambda;
            const args_as_names = is_lambda ? self.args_as_names() : null;
            vars.forEach((def, name) => {
                if (is_lambda && args_as_names.some((x) => x.name === def.name.name)) {
                    vars.delete(name);
                } else {
                    def = def.clone();
                    def.value = null;
                    defs.push(def);
                    vars.set(name, def);
                }
            });
            if (defs.length > 0) {
                // try to merge in assignments
                for (var i = 0; i < self.body.length;) {
                    if (self.body[i] instanceof AST_SimpleStatement) {
                        var expr = self.body[i].body, sym, assign;
                        if (expr instanceof AST_Assign
                            && expr.operator == "="
                            && (sym = expr.left) instanceof AST_Symbol
                            && vars.has(sym.name)
                        ) {
                            var def = vars.get(sym.name);
                            if (def.value) break;
                            def.value = expr.right;
                            remove(defs, def);
                            defs.push(def);
                            self.body.splice(i, 1);
                            continue;
                        }
                        if (expr instanceof AST_Sequence
                            && (assign = expr.expressions[0]) instanceof AST_Assign
                            && assign.operator == "="
                            && (sym = assign.left) instanceof AST_Symbol
                            && vars.has(sym.name)
                        ) {
                            var def = vars.get(sym.name);
                            if (def.value) break;
                            def.value = assign.right;
                            remove(defs, def);
                            defs.push(def);
                            self.body[i].body = make_sequence(expr, expr.expressions.slice(1));
                            continue;
                        }
                    }
                    if (self.body[i] instanceof AST_EmptyStatement) {
                        self.body.splice(i, 1);
                        continue;
                    }
                    if (self.body[i] instanceof AST_BlockStatement) {
                        self.body.splice(i, 1, ...self.body[i].body);
                        continue;
                    }
                    break;
                }
                defs = make_node(AST_Var, self, {
                    definitions: defs
                });
                hoisted.push(defs);
            }
        }
        self.body = dirs.concat(hoisted, self.body);
    }
    return self;
});

AST_Scope.DEFMETHOD("hoist_properties", function(compressor) {
    var self = this;
    if (!compressor.option("hoist_props") || compressor.has_directive("use asm")) return self;
    var top_retain = self instanceof AST_Toplevel && compressor.top_retain || return_false;
    var defs_by_id = new Map();
    var hoister = new TreeTransformer(function(node, descend) {
        if (node instanceof AST_Definitions
            && hoister.parent() instanceof AST_Export) return node;
        if (node instanceof AST_VarDef) {
            const sym = node.name;
            let def;
            let value;
            if (sym.scope === self
                && (def = sym.definition()).escaped != 1
                && !def.assignments
                && !def.direct_access
                && !def.single_use
                && !compressor.exposed(def)
                && !top_retain(def)
                && (value = sym.fixed_value()) === node.value
                && value instanceof AST_Object
                && !value.properties.some(prop =>
                    prop instanceof AST_Expansion || prop.computed_key()
                )
            ) {
                descend(node, this);
                const defs = new Map();
                const assignments = [];
                value.properties.forEach(({ key, value }) => {
                    const scope = hoister.find_scope();
                    const symbol = self.create_symbol(sym.CTOR, {
                        source: sym,
                        scope,
                        conflict_scopes: new Set([
                            scope,
                            ...sym.definition().references.map(ref => ref.scope)
                        ]),
                        tentative_name: sym.name + "_" + key
                    });

                    defs.set(String(key), symbol.definition());

                    assignments.push(make_node(AST_VarDef, node, {
                        name: symbol,
                        value
                    }));
                });
                defs_by_id.set(def.id, defs);
                return MAP.splice(assignments);
            }
        } else if (node instanceof AST_PropAccess
            && node.expression instanceof AST_SymbolRef
        ) {
            const defs = defs_by_id.get(node.expression.definition().id);
            if (defs) {
                const def = defs.get(String(get_simple_key(node.property)));
                const sym = make_node(AST_SymbolRef, node, {
                    name: def.name,
                    scope: node.expression.scope,
                    thedef: def
                });
                sym.reference({});
                return sym;
            }
        }
    });
    return self.transform(hoister);
});

def_optimize(AST_SimpleStatement, function(self, compressor) {
    if (compressor.option("side_effects")) {
        var body = self.body;
        var node = body.drop_side_effect_free(compressor, true);
        if (!node) {
            return make_node(AST_EmptyStatement, self);
        }
        if (node !== body) {
            return make_node(AST_SimpleStatement, self, { body: node });
        }
    }
    return self;
});

def_optimize(AST_While, function(self, compressor) {
    return compressor.option("loops") ? make_node(AST_For, self, self).optimize(compressor) : self;
});

def_optimize(AST_Do, function(self, compressor) {
    if (!compressor.option("loops")) return self;
    var cond = self.condition.tail_node().evaluate(compressor);
    if (!(cond instanceof AST_Node)) {
        if (cond) return make_node(AST_For, self, {
            body: make_node(AST_BlockStatement, self.body, {
                body: [
                    self.body,
                    make_node(AST_SimpleStatement, self.condition, {
                        body: self.condition
                    })
                ]
            })
        }).optimize(compressor);
        if (!has_break_or_continue(self, compressor.parent())) {
            return make_node(AST_BlockStatement, self.body, {
                body: [
                    self.body,
                    make_node(AST_SimpleStatement, self.condition, {
                        body: self.condition
                    })
                ]
            }).optimize(compressor);
        }
    }
    return self;
});

function if_break_in_loop(self, compressor) {
    var first = self.body instanceof AST_BlockStatement ? self.body.body[0] : self.body;
    if (compressor.option("dead_code") && is_break(first)) {
        var body = [];
        if (self.init instanceof AST_Statement) {
            body.push(self.init);
        } else if (self.init) {
            body.push(make_node(AST_SimpleStatement, self.init, {
                body: self.init
            }));
        }
        if (self.condition) {
            body.push(make_node(AST_SimpleStatement, self.condition, {
                body: self.condition
            }));
        }
        trim_unreachable_code(compressor, self.body, body);
        return make_node(AST_BlockStatement, self, {
            body: body
        });
    }
    if (first instanceof AST_If) {
        if (is_break(first.body)) {
            if (self.condition) {
                self.condition = make_node(AST_Binary, self.condition, {
                    left: self.condition,
                    operator: "&&",
                    right: first.condition.negate(compressor),
                });
            } else {
                self.condition = first.condition.negate(compressor);
            }
            drop_it(first.alternative);
        } else if (is_break(first.alternative)) {
            if (self.condition) {
                self.condition = make_node(AST_Binary, self.condition, {
                    left: self.condition,
                    operator: "&&",
                    right: first.condition,
                });
            } else {
                self.condition = first.condition;
            }
            drop_it(first.body);
        }
    }
    return self;

    function is_break(node) {
        return node instanceof AST_Break
            && compressor.loopcontrol_target(node) === compressor.self();
    }

    function drop_it(rest) {
        rest = as_statement_array(rest);
        if (self.body instanceof AST_BlockStatement) {
            self.body = self.body.clone();
            self.body.body = rest.concat(self.body.body.slice(1));
            self.body = self.body.transform(compressor);
        } else {
            self.body = make_node(AST_BlockStatement, self.body, {
                body: rest
            }).transform(compressor);
        }
        self = if_break_in_loop(self, compressor);
    }
}

def_optimize(AST_For, function(self, compressor) {
    if (!compressor.option("loops")) return self;
    if (compressor.option("side_effects") && self.init) {
        self.init = self.init.drop_side_effect_free(compressor);
    }
    if (self.condition) {
        var cond = self.condition.evaluate(compressor);
        if (!(cond instanceof AST_Node)) {
            if (cond) self.condition = null;
            else if (!compressor.option("dead_code")) {
                var orig = self.condition;
                self.condition = make_node_from_constant(cond, self.condition);
                self.condition = best_of_expression(self.condition.transform(compressor), orig);
            }
        }
        if (compressor.option("dead_code")) {
            if (cond instanceof AST_Node) cond = self.condition.tail_node().evaluate(compressor);
            if (!cond) {
                var body = [];
                trim_unreachable_code(compressor, self.body, body);
                if (self.init instanceof AST_Statement) {
                    body.push(self.init);
                } else if (self.init) {
                    body.push(make_node(AST_SimpleStatement, self.init, {
                        body: self.init
                    }));
                }
                body.push(make_node(AST_SimpleStatement, self.condition, {
                    body: self.condition
                }));
                return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
            }
        }
    }
    return if_break_in_loop(self, compressor);
});

def_optimize(AST_If, function(self, compressor) {
    if (is_empty(self.alternative)) self.alternative = null;

    if (!compressor.option("conditionals")) return self;
    // if condition can be statically determined, drop
    // one of the blocks.  note, statically determined implies
    // “has no side effects”; also it doesn't work for cases like
    // `x && true`, though it probably should.
    var cond = self.condition.evaluate(compressor);
    if (!compressor.option("dead_code") && !(cond instanceof AST_Node)) {
        var orig = self.condition;
        self.condition = make_node_from_constant(cond, orig);
        self.condition = best_of_expression(self.condition.transform(compressor), orig);
    }
    if (compressor.option("dead_code")) {
        if (cond instanceof AST_Node) cond = self.condition.tail_node().evaluate(compressor);
        if (!cond) {
            var body = [];
            trim_unreachable_code(compressor, self.body, body);
            body.push(make_node(AST_SimpleStatement, self.condition, {
                body: self.condition
            }));
            if (self.alternative) body.push(self.alternative);
            return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
        } else if (!(cond instanceof AST_Node)) {
            var body = [];
            body.push(make_node(AST_SimpleStatement, self.condition, {
                body: self.condition
            }));
            body.push(self.body);
            if (self.alternative) {
                trim_unreachable_code(compressor, self.alternative, body);
            }
            return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
        }
    }
    var negated = self.condition.negate(compressor);
    var self_condition_length = self.condition.size();
    var negated_length = negated.size();
    var negated_is_best = negated_length < self_condition_length;
    if (self.alternative && negated_is_best) {
        negated_is_best = false; // because we already do the switch here.
        // no need to swap values of self_condition_length and negated_length
        // here because they are only used in an equality comparison later on.
        self.condition = negated;
        var tmp = self.body;
        self.body = self.alternative || make_node(AST_EmptyStatement, self);
        self.alternative = tmp;
    }
    if (is_empty(self.body) && is_empty(self.alternative)) {
        return make_node(AST_SimpleStatement, self.condition, {
            body: self.condition.clone()
        }).optimize(compressor);
    }
    if (self.body instanceof AST_SimpleStatement
        && self.alternative instanceof AST_SimpleStatement) {
        return make_node(AST_SimpleStatement, self, {
            body: make_node(AST_Conditional, self, {
                condition   : self.condition,
                consequent  : self.body.body,
                alternative : self.alternative.body
            })
        }).optimize(compressor);
    }
    if (is_empty(self.alternative) && self.body instanceof AST_SimpleStatement) {
        if (self_condition_length === negated_length && !negated_is_best
            && self.condition instanceof AST_Binary && self.condition.operator == "||") {
            // although the code length of self.condition and negated are the same,
            // negated does not require additional surrounding parentheses.
            // see https://github.com/mishoo/UglifyJS2/issues/979
            negated_is_best = true;
        }
        if (negated_is_best) return make_node(AST_SimpleStatement, self, {
            body: make_node(AST_Binary, self, {
                operator : "||",
                left     : negated,
                right    : self.body.body
            })
        }).optimize(compressor);
        return make_node(AST_SimpleStatement, self, {
            body: make_node(AST_Binary, self, {
                operator : "&&",
                left     : self.condition,
                right    : self.body.body
            })
        }).optimize(compressor);
    }
    if (self.body instanceof AST_EmptyStatement
        && self.alternative instanceof AST_SimpleStatement) {
        return make_node(AST_SimpleStatement, self, {
            body: make_node(AST_Binary, self, {
                operator : "||",
                left     : self.condition,
                right    : self.alternative.body
            })
        }).optimize(compressor);
    }
    if (self.body instanceof AST_Exit
        && self.alternative instanceof AST_Exit
        && self.body.TYPE == self.alternative.TYPE) {
        return make_node(self.body.CTOR, self, {
            value: make_node(AST_Conditional, self, {
                condition   : self.condition,
                consequent  : self.body.value || make_node(AST_Undefined, self.body),
                alternative : self.alternative.value || make_node(AST_Undefined, self.alternative)
            }).transform(compressor)
        }).optimize(compressor);
    }
    if (self.body instanceof AST_If
        && !self.body.alternative
        && !self.alternative) {
        self = make_node(AST_If, self, {
            condition: make_node(AST_Binary, self.condition, {
                operator: "&&",
                left: self.condition,
                right: self.body.condition
            }),
            body: self.body.body,
            alternative: null
        });
    }
    if (aborts(self.body)) {
        if (self.alternative) {
            var alt = self.alternative;
            self.alternative = null;
            return make_node(AST_BlockStatement, self, {
                body: [ self, alt ]
            }).optimize(compressor);
        }
    }
    if (aborts(self.alternative)) {
        var body = self.body;
        self.body = self.alternative;
        self.condition = negated_is_best ? negated : self.condition.negate(compressor);
        self.alternative = null;
        return make_node(AST_BlockStatement, self, {
            body: [ self, body ]
        }).optimize(compressor);
    }
    return self;
});

def_optimize(AST_Switch, function(self, compressor) {
    if (!compressor.option("switches")) return self;
    var branch;
    var value = self.expression.evaluate(compressor);
    if (!(value instanceof AST_Node)) {
        var orig = self.expression;
        self.expression = make_node_from_constant(value, orig);
        self.expression = best_of_expression(self.expression.transform(compressor), orig);
    }
    if (!compressor.option("dead_code")) return self;
    if (value instanceof AST_Node) {
        value = self.expression.tail_node().evaluate(compressor);
    }
    var decl = [];
    var body = [];
    var default_branch;
    var exact_match;
    for (var i = 0, len = self.body.length; i < len && !exact_match; i++) {
        branch = self.body[i];
        if (branch instanceof AST_Default) {
            if (!default_branch) {
                default_branch = branch;
            } else {
                eliminate_branch(branch, body[body.length - 1]);
            }
        } else if (!(value instanceof AST_Node)) {
            var exp = branch.expression.evaluate(compressor);
            if (!(exp instanceof AST_Node) && exp !== value) {
                eliminate_branch(branch, body[body.length - 1]);
                continue;
            }
            if (exp instanceof AST_Node) exp = branch.expression.tail_node().evaluate(compressor);
            if (exp === value) {
                exact_match = branch;
                if (default_branch) {
                    var default_index = body.indexOf(default_branch);
                    body.splice(default_index, 1);
                    eliminate_branch(default_branch, body[default_index - 1]);
                    default_branch = null;
                }
            }
        }
        body.push(branch);
    }
    while (i < len) eliminate_branch(self.body[i++], body[body.length - 1]);
    self.body = body;

    let default_or_exact = default_branch || exact_match;
    default_branch = null;
    exact_match = null;

    // group equivalent branches so they will be located next to each other,
    // that way the next micro-optimization will merge them.
    // ** bail micro-optimization if not a simple switch case with breaks
    if (body.every((branch, i) =>
        (branch === default_or_exact || branch.expression instanceof AST_Constant)
        && (branch.body.length === 0 || aborts(branch) || body.length - 1 === i))
    ) {
        for (let i = 0; i < body.length; i++) {
            const branch = body[i];
            for (let j = i + 1; j < body.length; j++) {
                const next = body[j];
                if (next.body.length === 0) continue;
                const last_branch = j === (body.length - 1);
                const equivalentBranch = branches_equivalent(next, branch, false);
                if (equivalentBranch || (last_branch && branches_equivalent(next, branch, true))) {
                    if (!equivalentBranch && last_branch) {
                        next.body.push(make_node(AST_Break));
                    }

                    // let's find previous siblings with inert fallthrough...
                    let x = j - 1;
                    let fallthroughDepth = 0;
                    while (x > i) {
                        if (is_inert_body(body[x--])) {
                            fallthroughDepth++;
                        } else {
                            break;
                        }
                    }

                    const plucked = body.splice(j - fallthroughDepth, 1 + fallthroughDepth);
                    body.splice(i + 1, 0, ...plucked);
                    i += plucked.length;
                }
            }
        }
    }

    // merge equivalent branches in a row
    for (let i = 0; i < body.length; i++) {
        let branch = body[i];
        if (branch.body.length === 0) continue;
        if (!aborts(branch)) continue;

        for (let j = i + 1; j < body.length; i++, j++) {
            let next = body[j];
            if (next.body.length === 0) continue;
            if (
                branches_equivalent(next, branch, false)
                || (j === body.length - 1 && branches_equivalent(next, branch, true))
            ) {
                branch.body = [];
                branch = next;
                continue;
            }
            break;
        }
    }

    // Prune any empty branches at the end of the switch statement.
    {
        let i = body.length - 1;
        for (; i >= 0; i--) {
            let bbody = body[i].body;
            if (is_break(bbody[bbody.length - 1], compressor)) bbody.pop();
            if (!is_inert_body(body[i])) break;
        }
        // i now points to the index of a branch that contains a body. By incrementing, it's
        // pointing to the first branch that's empty.
        i++;
        if (!default_or_exact || body.indexOf(default_or_exact) >= i) {
            // The default behavior is to do nothing. We can take advantage of that to
            // remove all case expressions that are side-effect free that also do
            // nothing, since they'll default to doing nothing. But we can't remove any
            // case expressions before one that would side-effect, since they may cause
            // the side-effect to be skipped.
            for (let j = body.length - 1; j >= i; j--) {
                let branch = body[j];
                if (branch === default_or_exact) {
                    default_or_exact = null;
                    body.pop();
                } else if (!branch.expression.has_side_effects(compressor)) {
                    body.pop();
                } else {
                    break;
                }
            }
        }
    }


    // Prune side-effect free branches that fall into default.
    DEFAULT: if (default_or_exact) {
        let default_index = body.indexOf(default_or_exact);
        let default_body_index = default_index;
        for (; default_body_index < body.length - 1; default_body_index++) {
            if (!is_inert_body(body[default_body_index])) break;
        }
        if (default_body_index < body.length - 1) {
            break DEFAULT;
        }

        let side_effect_index = body.length - 1;
        for (; side_effect_index >= 0; side_effect_index--) {
            let branch = body[side_effect_index];
            if (branch === default_or_exact) continue;
            if (branch.expression.has_side_effects(compressor)) break;
        }
        // If the default behavior comes after any side-effect case expressions,
        // then we can fold all side-effect free cases into the default branch.
        // If the side-effect case is after the default, then any side-effect
        // free cases could prevent the side-effect from occurring.
        if (default_body_index > side_effect_index) {
            let prev_body_index = default_index - 1;
            for (; prev_body_index >= 0; prev_body_index--) {
                if (!is_inert_body(body[prev_body_index])) break;
            }
            let before = Math.max(side_effect_index, prev_body_index) + 1;
            let after = default_index;
            if (side_effect_index > default_index) {
                // If the default falls into the same body as a side-effect
                // case, then we need preserve that case and only prune the
                // cases after it.
                after = side_effect_index;
                body[side_effect_index].body = body[default_body_index].body;
            } else {
                // The default will be the last branch.
                default_or_exact.body = body[default_body_index].body;
            }

            // Prune everything after the default (or last side-effect case)
            // until the next case with a body.
            body.splice(after + 1, default_body_index - after);
            // Prune everything before the default that falls into it.
            body.splice(before, default_index - before);
        }
    }

    // See if we can remove the switch entirely if all cases (the default) fall into the same case body.
    DEFAULT: if (default_or_exact) {
        let i = body.findIndex(branch => !is_inert_body(branch));
        let caseBody;
        // `i` is equal to one of the following:
        // - `-1`, there is no body in the switch statement.
        // - `body.length - 1`, all cases fall into the same body.
        // - anything else, there are multiple bodies in the switch.
        if (i === body.length - 1) {
            // All cases fall into the case body.
            let branch = body[i];
            if (has_nested_break(self)) break DEFAULT;

            // This is the last case body, and we've already pruned any breaks, so it's
            // safe to hoist.
            caseBody = make_node(AST_BlockStatement, branch, {
                body: branch.body
            });
            branch.body = [];
        } else if (i !== -1) {
            // If there are multiple bodies, then we cannot optimize anything.
            break DEFAULT;
        }

        let sideEffect = body.find(branch => {
            return (
                branch !== default_or_exact
                && branch.expression.has_side_effects(compressor)
            );
        });
        // If no cases cause a side-effect, we can eliminate the switch entirely.
        if (!sideEffect) {
            return make_node(AST_BlockStatement, self, {
                body: decl.concat(
                    statement(self.expression),
                    default_or_exact.expression ? statement(default_or_exact.expression) : [],
                    caseBody || []
                )
            }).optimize(compressor);
        }

        // If we're this far, either there was no body or all cases fell into the same body.
        // If there was no body, then we don't need a default branch (because the default is
        // do nothing). If there was a body, we'll extract it to after the switch, so the
        // switch's new default is to do nothing and we can still prune it.
        const default_index = body.indexOf(default_or_exact);
        body.splice(default_index, 1);
        default_or_exact = null;

        if (caseBody) {
            // Recurse into switch statement one more time so that we can append the case body
            // outside of the switch. This recursion will only happen once since we've pruned
            // the default case.
            return make_node(AST_BlockStatement, self, {
                body: decl.concat(self, caseBody)
            }).optimize(compressor);
        }
        // If we fall here, there is a default branch somewhere, there are no case bodies,
        // and there's a side-effect somewhere. Just let the below paths take care of it.
    }

    if (body.length > 0) {
        body[0].body = decl.concat(body[0].body);
    }

    if (body.length == 0) {
        return make_node(AST_BlockStatement, self, {
            body: decl.concat(statement(self.expression))
        }).optimize(compressor);
    }
    if (body.length == 1 && !has_nested_break(self)) {
        // This is the last case body, and we've already pruned any breaks, so it's
        // safe to hoist.
        let branch = body[0];
        return make_node(AST_If, self, {
            condition: make_node(AST_Binary, self, {
                operator: "===",
                left: self.expression,
                right: branch.expression,
            }),
            body: make_node(AST_BlockStatement, branch, {
                body: branch.body
            }),
            alternative: null
        }).optimize(compressor);
    }
    if (body.length === 2 && default_or_exact && !has_nested_break(self)) {
        let branch = body[0] === default_or_exact ? body[1] : body[0];
        let exact_exp = default_or_exact.expression && statement(default_or_exact.expression);
        if (aborts(body[0])) {
            // Only the first branch body could have a break (at the last statement)
            let first = body[0];
            if (is_break(first.body[first.body.length - 1], compressor)) {
                first.body.pop();
            }
            return make_node(AST_If, self, {
                condition: make_node(AST_Binary, self, {
                    operator: "===",
                    left: self.expression,
                    right: branch.expression,
                }),
                body: make_node(AST_BlockStatement, branch, {
                    body: branch.body
                }),
                alternative: make_node(AST_BlockStatement, default_or_exact, {
                    body: [].concat(
                        exact_exp || [],
                        default_or_exact.body
                    )
                })
            }).optimize(compressor);
        }
        let operator = "===";
        let consequent = make_node(AST_BlockStatement, branch, {
            body: branch.body,
        });
        let always = make_node(AST_BlockStatement, default_or_exact, {
            body: [].concat(
                exact_exp || [],
                default_or_exact.body
            )
        });
        if (body[0] === default_or_exact) {
            operator = "!==";
            let tmp = always;
            always = consequent;
            consequent = tmp;
        }
        return make_node(AST_BlockStatement, self, {
            body: [
                make_node(AST_If, self, {
                    condition: make_node(AST_Binary, self, {
                        operator: operator,
                        left: self.expression,
                        right: branch.expression,
                    }),
                    body: consequent,
                    alternative: null
                })
            ].concat(always)
        }).optimize(compressor);
    }
    return self;

    function eliminate_branch(branch, prev) {
        if (prev && !aborts(prev)) {
            prev.body = prev.body.concat(branch.body);
        } else {
            trim_unreachable_code(compressor, branch, decl);
        }
    }
    function branches_equivalent(branch, prev, insertBreak) {
        let bbody = branch.body;
        let pbody = prev.body;
        if (insertBreak) {
            bbody = bbody.concat(make_node(AST_Break));
        }
        if (bbody.length !== pbody.length) return false;
        let bblock = make_node(AST_BlockStatement, branch, { body: bbody });
        let pblock = make_node(AST_BlockStatement, prev, { body: pbody });
        return bblock.equivalent_to(pblock);
    }
    function statement(expression) {
        return make_node(AST_SimpleStatement, expression, {
            body: expression
        });
    }
    function has_nested_break(root) {
        let has_break = false;
        let tw = new TreeWalker(node => {
            if (has_break) return true;
            if (node instanceof AST_Lambda) return true;
            if (node instanceof AST_SimpleStatement) return true;
            if (!is_break(node, tw)) return;
            let parent = tw.parent();
            if (
                parent instanceof AST_SwitchBranch
                && parent.body[parent.body.length - 1] === node
            ) {
                return;
            }
            has_break = true;
        });
        root.walk(tw);
        return has_break;
    }
    function is_break(node, stack) {
        return node instanceof AST_Break
            && stack.loopcontrol_target(node) === self;
    }
    function is_inert_body(branch) {
        return !aborts(branch) && !make_node(AST_BlockStatement, branch, {
            body: branch.body
        }).has_side_effects(compressor);
    }
});

def_optimize(AST_Try, function(self, compressor) {
    tighten_body(self.body, compressor);
    if (self.bcatch && self.bfinally && self.bfinally.body.every(is_empty)) self.bfinally = null;
    if (compressor.option("dead_code") && self.body.every(is_empty)) {
        var body = [];
        if (self.bcatch) {
            trim_unreachable_code(compressor, self.bcatch, body);
        }
        if (self.bfinally) body.push(...self.bfinally.body);
        return make_node(AST_BlockStatement, self, {
            body: body
        }).optimize(compressor);
    }
    return self;
});

AST_Definitions.DEFMETHOD("remove_initializers", function() {
    var decls = [];
    this.definitions.forEach(function(def) {
        if (def.name instanceof AST_SymbolDeclaration) {
            def.value = null;
            decls.push(def);
        } else {
            walk(def.name, node => {
                if (node instanceof AST_SymbolDeclaration) {
                    decls.push(make_node(AST_VarDef, def, {
                        name: node,
                        value: null
                    }));
                }
            });
        }
    });
    this.definitions = decls;
});

AST_Definitions.DEFMETHOD("to_assignments", function(compressor) {
    var reduce_vars = compressor.option("reduce_vars");
    var assignments = [];

    for (const def of this.definitions) {
        if (def.value) {
            var name = make_node(AST_SymbolRef, def.name, def.name);
            assignments.push(make_node(AST_Assign, def, {
                operator : "=",
                logical: false,
                left     : name,
                right    : def.value
            }));
            if (reduce_vars) name.definition().fixed = false;
        } else if (def.value) {
            // Because it's a destructuring, do not turn into an assignment.
            var varDef = make_node(AST_VarDef, def, {
                name: def.name,
                value: def.value
            });
            var var_ = make_node(AST_Var, def, {
                definitions: [ varDef ]
            });
            assignments.push(var_);
        }
        const thedef = def.name.definition();
        thedef.eliminated++;
        thedef.replaced--;
    }

    if (assignments.length == 0) return null;
    return make_sequence(this, assignments);
});

def_optimize(AST_Definitions, function(self) {
    if (self.definitions.length == 0)
        return make_node(AST_EmptyStatement, self);
    return self;
});

def_optimize(AST_VarDef, function(self, compressor) {
    if (
        self.name instanceof AST_SymbolLet
        && self.value != null
        && is_undefined(self.value, compressor)
    ) {
        self.value = null;
    }
    return self;
});

def_optimize(AST_Import, function(self) {
    return self;
});

def_optimize(AST_Call, function(self, compressor) {
    var exp = self.expression;
    var fn = exp;
    inline_array_like_spread(self.args);
    var simple_args = self.args.every((arg) =>
        !(arg instanceof AST_Expansion)
    );

    if (compressor.option("reduce_vars")
        && fn instanceof AST_SymbolRef
        && !has_annotation(self, _NOINLINE)
    ) {
        const fixed = fn.fixed_value();
        if (!retain_top_func(fixed, compressor)) {
            fn = fixed;
        }
    }

    var is_func = fn instanceof AST_Lambda;

    if (is_func && fn.pinned()) return self;

    if (compressor.option("unused")
        && simple_args
        && is_func
        && !fn.uses_arguments) {
        var pos = 0, last = 0;
        for (var i = 0, len = self.args.length; i < len; i++) {
            if (fn.argnames[i] instanceof AST_Expansion) {
                if (has_flag(fn.argnames[i].expression, UNUSED)) while (i < len) {
                    var node = self.args[i++].drop_side_effect_free(compressor);
                    if (node) {
                        self.args[pos++] = node;
                    }
                } else while (i < len) {
                    self.args[pos++] = self.args[i++];
                }
                last = pos;
                break;
            }
            var trim = i >= fn.argnames.length;
            if (trim || has_flag(fn.argnames[i], UNUSED)) {
                var node = self.args[i].drop_side_effect_free(compressor);
                if (node) {
                    self.args[pos++] = node;
                } else if (!trim) {
                    self.args[pos++] = make_node(AST_Number, self.args[i], {
                        value: 0
                    });
                    continue;
                }
            } else {
                self.args[pos++] = self.args[i];
            }
            last = pos;
        }
        self.args.length = last;
    }

    if (compressor.option("unsafe")) {
        if (exp instanceof AST_Dot && exp.start.value === "Array" && exp.property === "from" && self.args.length === 1) {
            const [argument] = self.args;
            if (argument instanceof AST_Array) {
                return make_node(AST_Array, argument, {
                    elements: argument.elements
                }).optimize(compressor);
            }
        }
        if (is_undeclared_ref(exp)) switch (exp.name) {
          case "Array":
            if (self.args.length != 1) {
                return make_node(AST_Array, self, {
                    elements: self.args
                }).optimize(compressor);
            } else if (self.args[0] instanceof AST_Number && self.args[0].value <= 11) {
                const elements = [];
                for (let i = 0; i < self.args[0].value; i++) elements.push(new AST_Hole);
                return new AST_Array({ elements });
            }
            break;
          case "Object":
            if (self.args.length == 0) {
                return make_node(AST_Object, self, {
                    properties: []
                });
            }
            break;
          case "String":
            if (self.args.length == 0) return make_node(AST_String, self, {
                value: ""
            });
            if (self.args.length <= 1) return make_node(AST_Binary, self, {
                left: self.args[0],
                operator: "+",
                right: make_node(AST_String, self, { value: "" })
            }).optimize(compressor);
            break;
          case "Number":
            if (self.args.length == 0) return make_node(AST_Number, self, {
                value: 0
            });
            if (self.args.length == 1 && compressor.option("unsafe_math")) {
                return make_node(AST_UnaryPrefix, self, {
                    expression: self.args[0],
                    operator: "+"
                }).optimize(compressor);
            }
            break;
          case "Symbol":
            if (self.args.length == 1 && self.args[0] instanceof AST_String && compressor.option("unsafe_symbols"))
                self.args.length = 0;
                break;
          case "Boolean":
            if (self.args.length == 0) return make_node(AST_False, self);
            if (self.args.length == 1) return make_node(AST_UnaryPrefix, self, {
                expression: make_node(AST_UnaryPrefix, self, {
                    expression: self.args[0],
                    operator: "!"
                }),
                operator: "!"
            }).optimize(compressor);
            break;
          case "RegExp":
            var params = [];
            if (self.args.length >= 1
                && self.args.length <= 2
                && self.args.every((arg) => {
                    var value = arg.evaluate(compressor);
                    params.push(value);
                    return arg !== value;
                })
                && regexp_is_safe(params[0])
            ) {
                let [ source, flags ] = params;
                source = regexp_source_fix(new RegExp(source).source);
                const rx = make_node(AST_RegExp, self, {
                    value: { source, flags }
                });
                if (rx._eval(compressor) !== rx) {
                    return rx;
                }
            }
            break;
        } else if (exp instanceof AST_Dot) switch(exp.property) {
          case "toString":
            if (self.args.length == 0 && !exp.expression.may_throw_on_access(compressor)) {
                return make_node(AST_Binary, self, {
                    left: make_node(AST_String, self, { value: "" }),
                    operator: "+",
                    right: exp.expression
                }).optimize(compressor);
            }
            break;
          case "join":
            if (exp.expression instanceof AST_Array) EXIT: {
                var separator;
                if (self.args.length > 0) {
                    separator = self.args[0].evaluate(compressor);
                    if (separator === self.args[0]) break EXIT; // not a constant
                }
                var elements = [];
                var consts = [];
                for (var i = 0, len = exp.expression.elements.length; i < len; i++) {
                    var el = exp.expression.elements[i];
                    if (el instanceof AST_Expansion) break EXIT;
                    var value = el.evaluate(compressor);
                    if (value !== el) {
                        consts.push(value);
                    } else {
                        if (consts.length > 0) {
                            elements.push(make_node(AST_String, self, {
                                value: consts.join(separator)
                            }));
                            consts.length = 0;
                        }
                        elements.push(el);
                    }
                }
                if (consts.length > 0) {
                    elements.push(make_node(AST_String, self, {
                        value: consts.join(separator)
                    }));
                }
                if (elements.length == 0) return make_node(AST_String, self, { value: "" });
                if (elements.length == 1) {
                    if (elements[0].is_string(compressor)) {
                        return elements[0];
                    }
                    return make_node(AST_Binary, elements[0], {
                        operator : "+",
                        left     : make_node(AST_String, self, { value: "" }),
                        right    : elements[0]
                    });
                }
                if (separator == "") {
                    var first;
                    if (elements[0].is_string(compressor)
                        || elements[1].is_string(compressor)) {
                        first = elements.shift();
                    } else {
                        first = make_node(AST_String, self, { value: "" });
                    }
                    return elements.reduce(function(prev, el) {
                        return make_node(AST_Binary, el, {
                            operator : "+",
                            left     : prev,
                            right    : el
                        });
                    }, first).optimize(compressor);
                }
                // need this awkward cloning to not affect original element
                // best_of will decide which one to get through.
                var node = self.clone();
                node.expression = node.expression.clone();
                node.expression.expression = node.expression.expression.clone();
                node.expression.expression.elements = elements;
                return best_of(compressor, self, node);
            }
            break;
          case "charAt":
            if (exp.expression.is_string(compressor)) {
                var arg = self.args[0];
                var index = arg ? arg.evaluate(compressor) : 0;
                if (index !== arg) {
                    return make_node(AST_Sub, exp, {
                        expression: exp.expression,
                        property: make_node_from_constant(index | 0, arg || exp)
                    }).optimize(compressor);
                }
            }
            break;
          case "apply":
            if (self.args.length == 2 && self.args[1] instanceof AST_Array) {
                var args = self.args[1].elements.slice();
                args.unshift(self.args[0]);
                return make_node(AST_Call, self, {
                    expression: make_node(AST_Dot, exp, {
                        expression: exp.expression,
                        optional: false,
                        property: "call"
                    }),
                    args: args
                }).optimize(compressor);
            }
            break;
          case "call":
            var func = exp.expression;
            if (func instanceof AST_SymbolRef) {
                func = func.fixed_value();
            }
            if (func instanceof AST_Lambda && !func.contains_this()) {
                return (self.args.length ? make_sequence(this, [
                    self.args[0],
                    make_node(AST_Call, self, {
                        expression: exp.expression,
                        args: self.args.slice(1)
                    })
                ]) : make_node(AST_Call, self, {
                    expression: exp.expression,
                    args: []
                })).optimize(compressor);
            }
            break;
        }
    }

    if (compressor.option("unsafe_Function")
        && is_undeclared_ref(exp)
        && exp.name == "Function") {
        // new Function() => function(){}
        if (self.args.length == 0) return make_node(AST_Function, self, {
            argnames: [],
            body: []
        }).optimize(compressor);
        var nth_identifier = compressor.mangle_options && compressor.mangle_options.nth_identifier || base54;
        if (self.args.every((x) => x instanceof AST_String)) {
            // quite a corner-case, but we can handle it:
            //   https://github.com/mishoo/UglifyJS2/issues/203
            // if the code argument is a constant, then we can minify it.
            try {
                var code = "n(function(" + self.args.slice(0, -1).map(function(arg) {
                    return arg.value;
                }).join(",") + "){" + self.args[self.args.length - 1].value + "})";
                var ast = parse(code);
                var mangle = { ie8: compressor.option("ie8"), nth_identifier: nth_identifier };
                ast.figure_out_scope(mangle);
                var comp = new Compressor(compressor.options, {
                    mangle_options: compressor.mangle_options
                });
                ast = ast.transform(comp);
                ast.figure_out_scope(mangle);
                ast.compute_char_frequency(mangle);
                ast.mangle_names(mangle);
                var fun;
                walk(ast, node => {
                    if (is_func_expr(node)) {
                        fun = node;
                        return walk_abort;
                    }
                });
                var code = OutputStream();
                AST_BlockStatement.prototype._codegen.call(fun, fun, code);
                self.args = [
                    make_node(AST_String, self, {
                        value: fun.argnames.map(function(arg) {
                            return arg.print_to_string();
                        }).join(",")
                    }),
                    make_node(AST_String, self.args[self.args.length - 1], {
                        value: code.get().replace(/^{|}$/g, "")
                    })
                ];
                return self;
            } catch (ex) {
                if (!(ex instanceof JS_Parse_Error)) {
                    throw ex;
                }

                // Otherwise, it crashes at runtime. Or maybe it's nonstandard syntax.
            }
        }
    }

    return inline_into_call(self, fn, compressor);
});

def_optimize(AST_New, function(self, compressor) {
    if (
        compressor.option("unsafe") &&
        is_undeclared_ref(self.expression) &&
        ["Object", "RegExp", "Function", "Error", "Array"].includes(self.expression.name)
    ) return make_node(AST_Call, self, self).transform(compressor);
    return self;
});

def_optimize(AST_Sequence, function(self, compressor) {
    if (!compressor.option("side_effects")) return self;
    var expressions = [];
    filter_for_side_effects();
    var end = expressions.length - 1;
    trim_right_for_undefined();
    if (end == 0) {
        self = maintain_this_binding(compressor.parent(), compressor.self(), expressions[0]);
        if (!(self instanceof AST_Sequence)) self = self.optimize(compressor);
        return self;
    }
    self.expressions = expressions;
    return self;

    function filter_for_side_effects() {
        var first = first_in_statement(compressor);
        var last = self.expressions.length - 1;
        self.expressions.forEach(function(expr, index) {
            if (index < last) expr = expr.drop_side_effect_free(compressor, first);
            if (expr) {
                merge_sequence(expressions, expr);
                first = false;
            }
        });
    }

    function trim_right_for_undefined() {
        while (end > 0 && is_undefined(expressions[end], compressor)) end--;
        if (end < expressions.length - 1) {
            expressions[end] = make_node(AST_UnaryPrefix, self, {
                operator   : "void",
                expression : expressions[end]
            });
            expressions.length = end + 1;
        }
    }
});

AST_Unary.DEFMETHOD("lift_sequences", function(compressor) {
    if (compressor.option("sequences")) {
        if (this.expression instanceof AST_Sequence) {
            var x = this.expression.expressions.slice();
            var e = this.clone();
            e.expression = x.pop();
            x.push(e);
            return make_sequence(this, x).optimize(compressor);
        }
    }
    return this;
});

def_optimize(AST_UnaryPostfix, function(self, compressor) {
    return self.lift_sequences(compressor);
});

def_optimize(AST_UnaryPrefix, function(self, compressor) {
    var e = self.expression;
    if (
        self.operator == "delete" &&
        !(
            e instanceof AST_SymbolRef ||
            e instanceof AST_PropAccess ||
            e instanceof AST_Chain ||
            is_identifier_atom(e)
        )
    ) {
        return make_sequence(self, [e, make_node(AST_True, self)]).optimize(compressor);
    }
    var seq = self.lift_sequences(compressor);
    if (seq !== self) {
        return seq;
    }
    if (compressor.option("side_effects") && self.operator == "void") {
        e = e.drop_side_effect_free(compressor);
        if (e) {
            self.expression = e;
            return self;
        } else {
            return make_node(AST_Undefined, self).optimize(compressor);
        }
    }
    if (compressor.in_boolean_context()) {
        switch (self.operator) {
          case "!":
            if (e instanceof AST_UnaryPrefix && e.operator == "!") {
                // !!foo ==> foo, if we're in boolean context
                return e.expression;
            }
            if (e instanceof AST_Binary) {
                self = best_of(compressor, self, e.negate(compressor, first_in_statement(compressor)));
            }
            break;
          case "typeof":
            // typeof always returns a non-empty string, thus it's
            // always true in booleans
            // And we don't need to check if it's undeclared, because in typeof, that's OK
            return (e instanceof AST_SymbolRef ? make_node(AST_True, self) : make_sequence(self, [
                e,
                make_node(AST_True, self)
            ])).optimize(compressor);
        }
    }
    if (self.operator == "-" && e instanceof AST_Infinity) {
        e = e.transform(compressor);
    }
    if (e instanceof AST_Binary
        && (self.operator == "+" || self.operator == "-")
        && (e.operator == "*" || e.operator == "/" || e.operator == "%")) {
        return make_node(AST_Binary, self, {
            operator: e.operator,
            left: make_node(AST_UnaryPrefix, e.left, {
                operator: self.operator,
                expression: e.left
            }),
            right: e.right
        });
    }
    // avoids infinite recursion of numerals
    if (self.operator != "-"
        || !(e instanceof AST_Number || e instanceof AST_Infinity || e instanceof AST_BigInt)) {
        var ev = self.evaluate(compressor);
        if (ev !== self) {
            ev = make_node_from_constant(ev, self).optimize(compressor);
            return best_of(compressor, ev, self);
        }
    }
    return self;
});

AST_Binary.DEFMETHOD("lift_sequences", function(compressor) {
    if (compressor.option("sequences")) {
        if (this.left instanceof AST_Sequence) {
            var x = this.left.expressions.slice();
            var e = this.clone();
            e.left = x.pop();
            x.push(e);
            return make_sequence(this, x).optimize(compressor);
        }
        if (this.right instanceof AST_Sequence && !this.left.has_side_effects(compressor)) {
            var assign = this.operator == "=" && this.left instanceof AST_SymbolRef;
            var x = this.right.expressions;
            var last = x.length - 1;
            for (var i = 0; i < last; i++) {
                if (!assign && x[i].has_side_effects(compressor)) break;
            }
            if (i == last) {
                x = x.slice();
                var e = this.clone();
                e.right = x.pop();
                x.push(e);
                return make_sequence(this, x).optimize(compressor);
            } else if (i > 0) {
                var e = this.clone();
                e.right = make_sequence(this.right, x.slice(i));
                x = x.slice(0, i);
                x.push(e);
                return make_sequence(this, x).optimize(compressor);
            }
        }
    }
    return this;
});

var commutativeOperators = makePredicate("== === != !== * & | ^");
function is_object(node) {
    return node instanceof AST_Array
        || node instanceof AST_Lambda
        || node instanceof AST_Object
        || node instanceof AST_Class;
}

def_optimize(AST_Binary, function(self, compressor) {
    function reversible() {
        return self.left.is_constant()
            || self.right.is_constant()
            || !self.left.has_side_effects(compressor)
                && !self.right.has_side_effects(compressor);
    }
    function reverse(op) {
        if (reversible()) {
            if (op) self.operator = op;
            var tmp = self.left;
            self.left = self.right;
            self.right = tmp;
        }
    }
    if (commutativeOperators.has(self.operator)) {
        if (self.right.is_constant()
            && !self.left.is_constant()) {
            // if right is a constant, whatever side effects the
            // left side might have could not influence the
            // result.  hence, force switch.

            if (!(self.left instanceof AST_Binary
                  && PRECEDENCE[self.left.operator] >= PRECEDENCE[self.operator])) {
                reverse();
            }
        }
    }
    self = self.lift_sequences(compressor);
    if (compressor.option("comparisons")) switch (self.operator) {
      case "===":
      case "!==":
        var is_strict_comparison = true;
        if ((self.left.is_string(compressor) && self.right.is_string(compressor)) ||
            (self.left.is_number(compressor) && self.right.is_number(compressor)) ||
            (self.left.is_boolean() && self.right.is_boolean()) ||
            self.left.equivalent_to(self.right)) {
            self.operator = self.operator.substr(0, 2);
        }
        // XXX: intentionally falling down to the next case
      case "==":
      case "!=":
        // void 0 == x => null == x
        if (!is_strict_comparison && is_undefined(self.left, compressor)) {
            self.left = make_node(AST_Null, self.left);
        } else if (compressor.option("typeofs")
            // "undefined" == typeof x => undefined === x
            && self.left instanceof AST_String
            && self.left.value == "undefined"
            && self.right instanceof AST_UnaryPrefix
            && self.right.operator == "typeof") {
            var expr = self.right.expression;
            if (expr instanceof AST_SymbolRef ? expr.is_declared(compressor)
                : !(expr instanceof AST_PropAccess && compressor.option("ie8"))) {
                self.right = expr;
                self.left = make_node(AST_Undefined, self.left).optimize(compressor);
                if (self.operator.length == 2) self.operator += "=";
            }
        } else if (self.left instanceof AST_SymbolRef
            // obj !== obj => false
            && self.right instanceof AST_SymbolRef
            && self.left.definition() === self.right.definition()
            && is_object(self.left.fixed_value())) {
            return make_node(self.operator[0] == "=" ? AST_True : AST_False, self);
        }
        break;
      case "&&":
      case "||":
        var lhs = self.left;
        if (lhs.operator == self.operator) {
            lhs = lhs.right;
        }
        if (lhs instanceof AST_Binary
            && lhs.operator == (self.operator == "&&" ? "!==" : "===")
            && self.right instanceof AST_Binary
            && lhs.operator == self.right.operator
            && (is_undefined(lhs.left, compressor) && self.right.left instanceof AST_Null
                || lhs.left instanceof AST_Null && is_undefined(self.right.left, compressor))
            && !lhs.right.has_side_effects(compressor)
            && lhs.right.equivalent_to(self.right.right)) {
            var combined = make_node(AST_Binary, self, {
                operator: lhs.operator.slice(0, -1),
                left: make_node(AST_Null, self),
                right: lhs.right
            });
            if (lhs !== self.left) {
                combined = make_node(AST_Binary, self, {
                    operator: self.operator,
                    left: self.left.left,
                    right: combined
                });
            }
            return combined;
        }
        break;
    }
    if (self.operator == "+" && compressor.in_boolean_context()) {
        var ll = self.left.evaluate(compressor);
        var rr = self.right.evaluate(compressor);
        if (ll && typeof ll == "string") {
            return make_sequence(self, [
                self.right,
                make_node(AST_True, self)
            ]).optimize(compressor);
        }
        if (rr && typeof rr == "string") {
            return make_sequence(self, [
                self.left,
                make_node(AST_True, self)
            ]).optimize(compressor);
        }
    }
    if (compressor.option("comparisons") && self.is_boolean()) {
        if (!(compressor.parent() instanceof AST_Binary)
            || compressor.parent() instanceof AST_Assign) {
            var negated = make_node(AST_UnaryPrefix, self, {
                operator: "!",
                expression: self.negate(compressor, first_in_statement(compressor))
            });
            self = best_of(compressor, self, negated);
        }
        if (compressor.option("unsafe_comps")) {
            switch (self.operator) {
              case "<": reverse(">"); break;
              case "<=": reverse(">="); break;
            }
        }
    }
    if (self.operator == "+") {
        if (self.right instanceof AST_String
            && self.right.getValue() == ""
            && self.left.is_string(compressor)) {
            return self.left;
        }
        if (self.left instanceof AST_String
            && self.left.getValue() == ""
            && self.right.is_string(compressor)) {
            return self.right;
        }
        if (self.left instanceof AST_Binary
            && self.left.operator == "+"
            && self.left.left instanceof AST_String
            && self.left.left.getValue() == ""
            && self.right.is_string(compressor)) {
            self.left = self.left.right;
            return self;
        }
    }
    if (compressor.option("evaluate")) {
        switch (self.operator) {
          case "&&":
            var ll = has_flag(self.left, TRUTHY)
                ? true
                : has_flag(self.left, FALSY)
                    ? false
                    : self.left.evaluate(compressor);
            if (!ll) {
                return maintain_this_binding(compressor.parent(), compressor.self(), self.left).optimize(compressor);
            } else if (!(ll instanceof AST_Node)) {
                return make_sequence(self, [ self.left, self.right ]).optimize(compressor);
            }
            var rr = self.right.evaluate(compressor);
            if (!rr) {
                if (compressor.in_boolean_context()) {
                    return make_sequence(self, [
                        self.left,
                        make_node(AST_False, self)
                    ]).optimize(compressor);
                } else {
                    set_flag(self, FALSY);
                }
            } else if (!(rr instanceof AST_Node)) {
                var parent = compressor.parent();
                if (parent.operator == "&&" && parent.left === compressor.self() || compressor.in_boolean_context()) {
                    return self.left.optimize(compressor);
                }
            }
            // x || false && y ---> x ? y : false
            if (self.left.operator == "||") {
                var lr = self.left.right.evaluate(compressor);
                if (!lr) return make_node(AST_Conditional, self, {
                    condition: self.left.left,
                    consequent: self.right,
                    alternative: self.left.right
                }).optimize(compressor);
            }
            break;
          case "||":
            var ll = has_flag(self.left, TRUTHY)
              ? true
              : has_flag(self.left, FALSY)
                ? false
                : self.left.evaluate(compressor);
            if (!ll) {
                return make_sequence(self, [ self.left, self.right ]).optimize(compressor);
            } else if (!(ll instanceof AST_Node)) {
                return maintain_this_binding(compressor.parent(), compressor.self(), self.left).optimize(compressor);
            }
            var rr = self.right.evaluate(compressor);
            if (!rr) {
                var parent = compressor.parent();
                if (parent.operator == "||" && parent.left === compressor.self() || compressor.in_boolean_context()) {
                    return self.left.optimize(compressor);
                }
            } else if (!(rr instanceof AST_Node)) {
                if (compressor.in_boolean_context()) {
                    return make_sequence(self, [
                        self.left,
                        make_node(AST_True, self)
                    ]).optimize(compressor);
                } else {
                    set_flag(self, TRUTHY);
                }
            }
            if (self.left.operator == "&&") {
                var lr = self.left.right.evaluate(compressor);
                if (lr && !(lr instanceof AST_Node)) return make_node(AST_Conditional, self, {
                    condition: self.left.left,
                    consequent: self.left.right,
                    alternative: self.right
                }).optimize(compressor);
            }
            break;
          case "??":
            if (is_nullish(self.left, compressor)) {
                return self.right;
            }

            var ll = self.left.evaluate(compressor);
            if (!(ll instanceof AST_Node)) {
                // if we know the value for sure we can simply compute right away.
                return ll == null ? self.right : self.left;
            }

            if (compressor.in_boolean_context()) {
                const rr = self.right.evaluate(compressor);
                if (!(rr instanceof AST_Node) && !rr) {
                    return self.left;
                }
            }
        }
        var associative = true;
        switch (self.operator) {
          case "+":
            // (x + "foo") + "bar" => x + "foobar"
            if (self.right instanceof AST_Constant
                && self.left instanceof AST_Binary
                && self.left.operator == "+"
                && self.left.is_string(compressor)) {
                var binary = make_node(AST_Binary, self, {
                    operator: "+",
                    left: self.left.right,
                    right: self.right,
                });
                var r = binary.optimize(compressor);
                if (binary !== r) {
                    self = make_node(AST_Binary, self, {
                        operator: "+",
                        left: self.left.left,
                        right: r
                    });
                }
            }
            // (x + "foo") + ("bar" + y) => (x + "foobar") + y
            if (self.left instanceof AST_Binary
                && self.left.operator == "+"
                && self.left.is_string(compressor)
                && self.right instanceof AST_Binary
                && self.right.operator == "+"
                && self.right.is_string(compressor)) {
                var binary = make_node(AST_Binary, self, {
                    operator: "+",
                    left: self.left.right,
                    right: self.right.left,
                });
                var m = binary.optimize(compressor);
                if (binary !== m) {
                    self = make_node(AST_Binary, self, {
                        operator: "+",
                        left: make_node(AST_Binary, self.left, {
                            operator: "+",
                            left: self.left.left,
                            right: m
                        }),
                        right: self.right.right
                    });
                }
            }
            // a + -b => a - b
            if (self.right instanceof AST_UnaryPrefix
                && self.right.operator == "-"
                && self.left.is_number(compressor)) {
                self = make_node(AST_Binary, self, {
                    operator: "-",
                    left: self.left,
                    right: self.right.expression
                });
                break;
            }
            // -a + b => b - a
            if (self.left instanceof AST_UnaryPrefix
                && self.left.operator == "-"
                && reversible()
                && self.right.is_number(compressor)) {
                self = make_node(AST_Binary, self, {
                    operator: "-",
                    left: self.right,
                    right: self.left.expression
                });
                break;
            }
            // `foo${bar}baz` + 1 => `foo${bar}baz1`
            if (self.left instanceof AST_TemplateString) {
                var l = self.left;
                var r = self.right.evaluate(compressor);
                if (r != self.right) {
                    l.segments[l.segments.length - 1].value += String(r);
                    return l;
                }
            }
            // 1 + `foo${bar}baz` => `1foo${bar}baz`
            if (self.right instanceof AST_TemplateString) {
                var r = self.right;
                var l = self.left.evaluate(compressor);
                if (l != self.left) {
                    r.segments[0].value = String(l) + r.segments[0].value;
                    return r;
                }
            }
            // `1${bar}2` + `foo${bar}baz` => `1${bar}2foo${bar}baz`
            if (self.left instanceof AST_TemplateString
                && self.right instanceof AST_TemplateString) {
                var l = self.left;
                var segments = l.segments;
                var r = self.right;
                segments[segments.length - 1].value += r.segments[0].value;
                for (var i = 1; i < r.segments.length; i++) {
                    segments.push(r.segments[i]);
                }
                return l;
            }
          case "*":
            associative = compressor.option("unsafe_math");
          case "&":
          case "|":
          case "^":
            // a + +b => +b + a
            if (self.left.is_number(compressor)
                && self.right.is_number(compressor)
                && reversible()
                && !(self.left instanceof AST_Binary
                    && self.left.operator != self.operator
                    && PRECEDENCE[self.left.operator] >= PRECEDENCE[self.operator])) {
                var reversed = make_node(AST_Binary, self, {
                    operator: self.operator,
                    left: self.right,
                    right: self.left
                });
                if (self.right instanceof AST_Constant
                    && !(self.left instanceof AST_Constant)) {
                    self = best_of(compressor, reversed, self);
                } else {
                    self = best_of(compressor, self, reversed);
                }
            }
            if (associative && self.is_number(compressor)) {
                // a + (b + c) => (a + b) + c
                if (self.right instanceof AST_Binary
                    && self.right.operator == self.operator) {
                    self = make_node(AST_Binary, self, {
                        operator: self.operator,
                        left: make_node(AST_Binary, self.left, {
                            operator: self.operator,
                            left: self.left,
                            right: self.right.left,
                            start: self.left.start,
                            end: self.right.left.end
                        }),
                        right: self.right.right
                    });
                }
                // (n + 2) + 3 => 5 + n
                // (2 * n) * 3 => 6 + n
                if (self.right instanceof AST_Constant
                    && self.left instanceof AST_Binary
                    && self.left.operator == self.operator) {
                    if (self.left.left instanceof AST_Constant) {
                        self = make_node(AST_Binary, self, {
                            operator: self.operator,
                            left: make_node(AST_Binary, self.left, {
                                operator: self.operator,
                                left: self.left.left,
                                right: self.right,
                                start: self.left.left.start,
                                end: self.right.end
                            }),
                            right: self.left.right
                        });
                    } else if (self.left.right instanceof AST_Constant) {
                        self = make_node(AST_Binary, self, {
                            operator: self.operator,
                            left: make_node(AST_Binary, self.left, {
                                operator: self.operator,
                                left: self.left.right,
                                right: self.right,
                                start: self.left.right.start,
                                end: self.right.end
                            }),
                            right: self.left.left
                        });
                    }
                }
                // (a | 1) | (2 | d) => (3 | a) | b
                if (self.left instanceof AST_Binary
                    && self.left.operator == self.operator
                    && self.left.right instanceof AST_Constant
                    && self.right instanceof AST_Binary
                    && self.right.operator == self.operator
                    && self.right.left instanceof AST_Constant) {
                    self = make_node(AST_Binary, self, {
                        operator: self.operator,
                        left: make_node(AST_Binary, self.left, {
                            operator: self.operator,
                            left: make_node(AST_Binary, self.left.left, {
                                operator: self.operator,
                                left: self.left.right,
                                right: self.right.left,
                                start: self.left.right.start,
                                end: self.right.left.end
                            }),
                            right: self.left.left
                        }),
                        right: self.right.right
                    });
                }
            }
        }
    }
    // x && (y && z)  ==>  x && y && z
    // x || (y || z)  ==>  x || y || z
    // x + ("y" + z)  ==>  x + "y" + z
    // "x" + (y + "z")==>  "x" + y + "z"
    if (self.right instanceof AST_Binary
        && self.right.operator == self.operator
        && (lazy_op.has(self.operator)
            || (self.operator == "+"
                && (self.right.left.is_string(compressor)
                    || (self.left.is_string(compressor)
                        && self.right.right.is_string(compressor)))))
    ) {
        self.left = make_node(AST_Binary, self.left, {
            operator : self.operator,
            left     : self.left.transform(compressor),
            right    : self.right.left.transform(compressor)
        });
        self.right = self.right.right.transform(compressor);
        return self.transform(compressor);
    }
    var ev = self.evaluate(compressor);
    if (ev !== self) {
        ev = make_node_from_constant(ev, self).optimize(compressor);
        return best_of(compressor, ev, self);
    }
    return self;
});

def_optimize(AST_SymbolExport, function(self) {
    return self;
});

def_optimize(AST_SymbolRef, function(self, compressor) {
    if (
        !compressor.option("ie8")
        && is_undeclared_ref(self)
        && !compressor.find_parent(AST_With)
    ) {
        switch (self.name) {
          case "undefined":
            return make_node(AST_Undefined, self).optimize(compressor);
          case "NaN":
            return make_node(AST_NaN, self).optimize(compressor);
          case "Infinity":
            return make_node(AST_Infinity, self).optimize(compressor);
        }
    }

    const parent = compressor.parent();
    if (compressor.option("reduce_vars") && is_lhs(self, parent) !== self) {
        return inline_into_symbolref(self, compressor);
    } else {
        return self;
    }
});

function is_atomic(lhs, self) {
    return lhs instanceof AST_SymbolRef || lhs.TYPE === self.TYPE;
}

def_optimize(AST_Undefined, function(self, compressor) {
    if (compressor.option("unsafe_undefined")) {
        var undef = find_variable(compressor, "undefined");
        if (undef) {
            var ref = make_node(AST_SymbolRef, self, {
                name   : "undefined",
                scope  : undef.scope,
                thedef : undef
            });
            set_flag(ref, UNDEFINED);
            return ref;
        }
    }
    var lhs = is_lhs(compressor.self(), compressor.parent());
    if (lhs && is_atomic(lhs, self)) return self;
    return make_node(AST_UnaryPrefix, self, {
        operator: "void",
        expression: make_node(AST_Number, self, {
            value: 0
        })
    });
});

def_optimize(AST_Infinity, function(self, compressor) {
    var lhs = is_lhs(compressor.self(), compressor.parent());
    if (lhs && is_atomic(lhs, self)) return self;
    if (
        compressor.option("keep_infinity")
        && !(lhs && !is_atomic(lhs, self))
        && !find_variable(compressor, "Infinity")
    ) {
        return self;
    }
    return make_node(AST_Binary, self, {
        operator: "/",
        left: make_node(AST_Number, self, {
            value: 1
        }),
        right: make_node(AST_Number, self, {
            value: 0
        })
    });
});

def_optimize(AST_NaN, function(self, compressor) {
    var lhs = is_lhs(compressor.self(), compressor.parent());
    if (lhs && !is_atomic(lhs, self)
        || find_variable(compressor, "NaN")) {
        return make_node(AST_Binary, self, {
            operator: "/",
            left: make_node(AST_Number, self, {
                value: 0
            }),
            right: make_node(AST_Number, self, {
                value: 0
            })
        });
    }
    return self;
});

const ASSIGN_OPS = makePredicate("+ - / * % >> << >>> | ^ &");
const ASSIGN_OPS_COMMUTATIVE = makePredicate("* | ^ &");
def_optimize(AST_Assign, function(self, compressor) {
    if (self.logical) {
        return self.lift_sequences(compressor);
    }

    var def;
    // x = x ---> x
    if (
        self.operator === "="
        && self.left instanceof AST_SymbolRef
        && self.left.name !== "arguments"
        && !(def = self.left.definition()).undeclared
        && self.right.equivalent_to(self.left)
    ) {
        return self.right;
    }

    if (compressor.option("dead_code")
        && self.left instanceof AST_SymbolRef
        && (def = self.left.definition()).scope === compressor.find_parent(AST_Lambda)) {
        var level = 0, node, parent = self;
        do {
            node = parent;
            parent = compressor.parent(level++);
            if (parent instanceof AST_Exit) {
                if (in_try(level, parent)) break;
                if (is_reachable(def.scope, [ def ])) break;
                if (self.operator == "=") return self.right;
                def.fixed = false;
                return make_node(AST_Binary, self, {
                    operator: self.operator.slice(0, -1),
                    left: self.left,
                    right: self.right
                }).optimize(compressor);
            }
        } while (parent instanceof AST_Binary && parent.right === node
            || parent instanceof AST_Sequence && parent.tail_node() === node);
    }
    self = self.lift_sequences(compressor);

    if (self.operator == "=" && self.left instanceof AST_SymbolRef && self.right instanceof AST_Binary) {
        // x = expr1 OP expr2
        if (self.right.left instanceof AST_SymbolRef
            && self.right.left.name == self.left.name
            && ASSIGN_OPS.has(self.right.operator)) {
            // x = x - 2  --->  x -= 2
            self.operator = self.right.operator + "=";
            self.right = self.right.right;
        } else if (self.right.right instanceof AST_SymbolRef
            && self.right.right.name == self.left.name
            && ASSIGN_OPS_COMMUTATIVE.has(self.right.operator)
            && !self.right.left.has_side_effects(compressor)) {
            // x = 2 & x  --->  x &= 2
            self.operator = self.right.operator + "=";
            self.right = self.right.left;
        }
    }
    return self;

    function in_try(level, node) {
        var right = self.right;
        self.right = make_node(AST_Null, right);
        var may_throw = node.may_throw(compressor);
        self.right = right;
        var scope = self.left.definition().scope;
        var parent;
        while ((parent = compressor.parent(level++)) !== scope) {
            if (parent instanceof AST_Try) {
                if (parent.bfinally) return true;
                if (may_throw && parent.bcatch) return true;
            }
        }
    }
});

def_optimize(AST_DefaultAssign, function(self, compressor) {
    if (!compressor.option("evaluate")) {
        return self;
    }
    var evaluateRight = self.right.evaluate(compressor);

    // `[x = undefined] = foo` ---> `[x] = foo`
    if (evaluateRight === undefined) {
        self = self.left;
    } else if (evaluateRight !== self.right) {
        evaluateRight = make_node_from_constant(evaluateRight, self.right);
        self.right = best_of_expression(evaluateRight, self.right);
    }

    return self;
});

function is_nullish_check(check, check_subject, compressor) {
    if (check_subject.may_throw(compressor)) return false;

    let nullish_side;

    // foo == null
    if (
        check instanceof AST_Binary
        && check.operator === "=="
        // which side is nullish?
        && (
            (nullish_side = is_nullish(check.left, compressor) && check.left)
            || (nullish_side = is_nullish(check.right, compressor) && check.right)
        )
        // is the other side the same as the check_subject
        && (
            nullish_side === check.left
                ? check.right
                : check.left
        ).equivalent_to(check_subject)
    ) {
        return true;
    }

    // foo === null || foo === undefined
    if (check instanceof AST_Binary && check.operator === "||") {
        let null_cmp;
        let undefined_cmp;

        const find_comparison = cmp => {
            if (!(
                cmp instanceof AST_Binary
                && (cmp.operator === "===" || cmp.operator === "==")
            )) {
                return false;
            }

            let found = 0;
            let defined_side;

            if (cmp.left instanceof AST_Null) {
                found++;
                null_cmp = cmp;
                defined_side = cmp.right;
            }
            if (cmp.right instanceof AST_Null) {
                found++;
                null_cmp = cmp;
                defined_side = cmp.left;
            }
            if (is_undefined(cmp.left, compressor)) {
                found++;
                undefined_cmp = cmp;
                defined_side = cmp.right;
            }
            if (is_undefined(cmp.right, compressor)) {
                found++;
                undefined_cmp = cmp;
                defined_side = cmp.left;
            }

            if (found !== 1) {
                return false;
            }

            if (!defined_side.equivalent_to(check_subject)) {
                return false;
            }

            return true;
        };

        if (!find_comparison(check.left)) return false;
        if (!find_comparison(check.right)) return false;

        if (null_cmp && undefined_cmp && null_cmp !== undefined_cmp) {
            return true;
        }
    }

    return false;
}

def_optimize(AST_Conditional, function(self, compressor) {
    if (!compressor.option("conditionals")) return self;
    // This looks like lift_sequences(), should probably be under "sequences"
    if (self.condition instanceof AST_Sequence) {
        var expressions = self.condition.expressions.slice();
        self.condition = expressions.pop();
        expressions.push(self);
        return make_sequence(self, expressions);
    }
    var cond = self.condition.evaluate(compressor);
    if (cond !== self.condition) {
        if (cond) {
            return maintain_this_binding(compressor.parent(), compressor.self(), self.consequent);
        } else {
            return maintain_this_binding(compressor.parent(), compressor.self(), self.alternative);
        }
    }
    var negated = cond.negate(compressor, first_in_statement(compressor));
    if (best_of(compressor, cond, negated) === negated) {
        self = make_node(AST_Conditional, self, {
            condition: negated,
            consequent: self.alternative,
            alternative: self.consequent
        });
    }
    var condition = self.condition;
    var consequent = self.consequent;
    var alternative = self.alternative;
    // x?x:y --> x||y
    if (condition instanceof AST_SymbolRef
        && consequent instanceof AST_SymbolRef
        && condition.definition() === consequent.definition()) {
        return make_node(AST_Binary, self, {
            operator: "||",
            left: condition,
            right: alternative
        });
    }
    // if (foo) exp = something; else exp = something_else;
    //                   |
    //                   v
    // exp = foo ? something : something_else;
    if (
        consequent instanceof AST_Assign
        && alternative instanceof AST_Assign
        && consequent.operator === alternative.operator
        && consequent.logical === alternative.logical
        && consequent.left.equivalent_to(alternative.left)
        && (!self.condition.has_side_effects(compressor)
            || consequent.operator == "="
                && !consequent.left.has_side_effects(compressor))
    ) {
        return make_node(AST_Assign, self, {
            operator: consequent.operator,
            left: consequent.left,
            logical: consequent.logical,
            right: make_node(AST_Conditional, self, {
                condition: self.condition,
                consequent: consequent.right,
                alternative: alternative.right
            })
        });
    }
    // x ? y(a) : y(b) --> y(x ? a : b)
    var arg_index;
    if (consequent instanceof AST_Call
        && alternative.TYPE === consequent.TYPE
        && consequent.args.length > 0
        && consequent.args.length == alternative.args.length
        && consequent.expression.equivalent_to(alternative.expression)
        && !self.condition.has_side_effects(compressor)
        && !consequent.expression.has_side_effects(compressor)
        && typeof (arg_index = single_arg_diff()) == "number") {
        var node = consequent.clone();
        node.args[arg_index] = make_node(AST_Conditional, self, {
            condition: self.condition,
            consequent: consequent.args[arg_index],
            alternative: alternative.args[arg_index]
        });
        return node;
    }
    // a ? b : c ? b : d --> (a || c) ? b : d
    if (alternative instanceof AST_Conditional
        && consequent.equivalent_to(alternative.consequent)) {
        return make_node(AST_Conditional, self, {
            condition: make_node(AST_Binary, self, {
                operator: "||",
                left: condition,
                right: alternative.condition
            }),
            consequent: consequent,
            alternative: alternative.alternative
        }).optimize(compressor);
    }

    // a == null ? b : a -> a ?? b
    if (
        compressor.option("ecma") >= 2020 &&
        is_nullish_check(condition, alternative, compressor)
    ) {
        return make_node(AST_Binary, self, {
            operator: "??",
            left: alternative,
            right: consequent
        }).optimize(compressor);
    }

    // a ? b : (c, b) --> (a || c), b
    if (alternative instanceof AST_Sequence
        && consequent.equivalent_to(alternative.expressions[alternative.expressions.length - 1])) {
        return make_sequence(self, [
            make_node(AST_Binary, self, {
                operator: "||",
                left: condition,
                right: make_sequence(self, alternative.expressions.slice(0, -1))
            }),
            consequent
        ]).optimize(compressor);
    }
    // a ? b : (c && b) --> (a || c) && b
    if (alternative instanceof AST_Binary
        && alternative.operator == "&&"
        && consequent.equivalent_to(alternative.right)) {
        return make_node(AST_Binary, self, {
            operator: "&&",
            left: make_node(AST_Binary, self, {
                operator: "||",
                left: condition,
                right: alternative.left
            }),
            right: consequent
        }).optimize(compressor);
    }
    // x?y?z:a:a --> x&&y?z:a
    if (consequent instanceof AST_Conditional
        && consequent.alternative.equivalent_to(alternative)) {
        return make_node(AST_Conditional, self, {
            condition: make_node(AST_Binary, self, {
                left: self.condition,
                operator: "&&",
                right: consequent.condition
            }),
            consequent: consequent.consequent,
            alternative: alternative
        });
    }
    // x ? y : y --> x, y
    if (consequent.equivalent_to(alternative)) {
        return make_sequence(self, [
            self.condition,
            consequent
        ]).optimize(compressor);
    }
    // x ? y || z : z --> x && y || z
    if (consequent instanceof AST_Binary
        && consequent.operator == "||"
        && consequent.right.equivalent_to(alternative)) {
        return make_node(AST_Binary, self, {
            operator: "||",
            left: make_node(AST_Binary, self, {
                operator: "&&",
                left: self.condition,
                right: consequent.left
            }),
            right: alternative
        }).optimize(compressor);
    }

    const in_bool = compressor.in_boolean_context();
    if (is_true(self.consequent)) {
        if (is_false(self.alternative)) {
            // c ? true : false ---> !!c
            return booleanize(self.condition);
        }
        // c ? true : x ---> !!c || x
        return make_node(AST_Binary, self, {
            operator: "||",
            left: booleanize(self.condition),
            right: self.alternative
        });
    }
    if (is_false(self.consequent)) {
        if (is_true(self.alternative)) {
            // c ? false : true ---> !c
            return booleanize(self.condition.negate(compressor));
        }
        // c ? false : x ---> !c && x
        return make_node(AST_Binary, self, {
            operator: "&&",
            left: booleanize(self.condition.negate(compressor)),
            right: self.alternative
        });
    }
    if (is_true(self.alternative)) {
        // c ? x : true ---> !c || x
        return make_node(AST_Binary, self, {
            operator: "||",
            left: booleanize(self.condition.negate(compressor)),
            right: self.consequent
        });
    }
    if (is_false(self.alternative)) {
        // c ? x : false ---> !!c && x
        return make_node(AST_Binary, self, {
            operator: "&&",
            left: booleanize(self.condition),
            right: self.consequent
        });
    }

    return self;

    function booleanize(node) {
        if (node.is_boolean()) return node;
        // !!expression
        return make_node(AST_UnaryPrefix, node, {
            operator: "!",
            expression: node.negate(compressor)
        });
    }

    // AST_True or !0
    function is_true(node) {
        return node instanceof AST_True
            || in_bool
                && node instanceof AST_Constant
                && node.getValue()
            || (node instanceof AST_UnaryPrefix
                && node.operator == "!"
                && node.expression instanceof AST_Constant
                && !node.expression.getValue());
    }
    // AST_False or !1
    function is_false(node) {
        return node instanceof AST_False
            || in_bool
                && node instanceof AST_Constant
                && !node.getValue()
            || (node instanceof AST_UnaryPrefix
                && node.operator == "!"
                && node.expression instanceof AST_Constant
                && node.expression.getValue());
    }

    function single_arg_diff() {
        var a = consequent.args;
        var b = alternative.args;
        for (var i = 0, len = a.length; i < len; i++) {
            if (a[i] instanceof AST_Expansion) return;
            if (!a[i].equivalent_to(b[i])) {
                if (b[i] instanceof AST_Expansion) return;
                for (var j = i + 1; j < len; j++) {
                    if (a[j] instanceof AST_Expansion) return;
                    if (!a[j].equivalent_to(b[j])) return;
                }
                return i;
            }
        }
    }
});

def_optimize(AST_Boolean, function(self, compressor) {
    if (compressor.in_boolean_context()) return make_node(AST_Number, self, {
        value: +self.value
    });
    var p = compressor.parent();
    if (compressor.option("booleans_as_integers")) {
        if (p instanceof AST_Binary && (p.operator == "===" || p.operator == "!==")) {
            p.operator = p.operator.replace(/=$/, "");
        }
        return make_node(AST_Number, self, {
            value: +self.value
        });
    }
    if (compressor.option("booleans")) {
        if (p instanceof AST_Binary && (p.operator == "=="
                                        || p.operator == "!=")) {
            return make_node(AST_Number, self, {
                value: +self.value
            });
        }
        return make_node(AST_UnaryPrefix, self, {
            operator: "!",
            expression: make_node(AST_Number, self, {
                value: 1 - self.value
            })
        });
    }
    return self;
});

function safe_to_flatten(value, compressor) {
    if (value instanceof AST_SymbolRef) {
        value = value.fixed_value();
    }
    if (!value) return false;
    if (!(value instanceof AST_Lambda || value instanceof AST_Class)) return true;
    if (!(value instanceof AST_Lambda && value.contains_this())) return true;
    return compressor.parent() instanceof AST_New;
}

AST_PropAccess.DEFMETHOD("flatten_object", function(key, compressor) {
    if (!compressor.option("properties")) return;
    if (key === "__proto__") return;

    var arrows = compressor.option("unsafe_arrows") && compressor.option("ecma") >= 2015;
    var expr = this.expression;
    if (expr instanceof AST_Object) {
        var props = expr.properties;

        for (var i = props.length; --i >= 0;) {
            var prop = props[i];

            if ("" + (prop instanceof AST_ConciseMethod ? prop.key.name : prop.key) == key) {
                const all_props_flattenable = props.every((p) =>
                    (p instanceof AST_ObjectKeyVal
                        || arrows && p instanceof AST_ConciseMethod && !p.is_generator
                    )
                    && !p.computed_key()
                );

                if (!all_props_flattenable) return;
                if (!safe_to_flatten(prop.value, compressor)) return;

                return make_node(AST_Sub, this, {
                    expression: make_node(AST_Array, expr, {
                        elements: props.map(function(prop) {
                            var v = prop.value;
                            if (v instanceof AST_Accessor) {
                                v = make_node(AST_Function, v, v);
                            }

                            var k = prop.key;
                            if (k instanceof AST_Node && !(k instanceof AST_SymbolMethod)) {
                                return make_sequence(prop, [ k, v ]);
                            }

                            return v;
                        })
                    }),
                    property: make_node(AST_Number, this, {
                        value: i
                    })
                });
            }
        }
    }
});

def_optimize(AST_Sub, function(self, compressor) {
    var expr = self.expression;
    var prop = self.property;
    if (compressor.option("properties")) {
        var key = prop.evaluate(compressor);
        if (key !== prop) {
            if (typeof key == "string") {
                if (key == "undefined") {
                    key = undefined;
                } else {
                    var value = parseFloat(key);
                    if (value.toString() == key) {
                        key = value;
                    }
                }
            }
            prop = self.property = best_of_expression(prop, make_node_from_constant(key, prop).transform(compressor));
            var property = "" + key;
            if (is_basic_identifier_string(property)
                && property.length <= prop.size() + 1) {
                return make_node(AST_Dot, self, {
                    expression: expr,
                    optional: self.optional,
                    property: property,
                    quote: prop.quote,
                }).optimize(compressor);
            }
        }
    }
    var fn;
    OPT_ARGUMENTS: if (compressor.option("arguments")
        && expr instanceof AST_SymbolRef
        && expr.name == "arguments"
        && expr.definition().orig.length == 1
        && (fn = expr.scope) instanceof AST_Lambda
        && fn.uses_arguments
        && !(fn instanceof AST_Arrow)
        && prop instanceof AST_Number) {
        var index = prop.getValue();
        var params = new Set();
        var argnames = fn.argnames;
        for (var n = 0; n < argnames.length; n++) {
            if (!(argnames[n] instanceof AST_SymbolFunarg)) {
                break OPT_ARGUMENTS; // destructuring parameter - bail
            }
            var param = argnames[n].name;
            if (params.has(param)) {
                break OPT_ARGUMENTS; // duplicate parameter - bail
            }
            params.add(param);
        }
        var argname = fn.argnames[index];
        if (argname && compressor.has_directive("use strict")) {
            var def = argname.definition();
            if (!compressor.option("reduce_vars") || def.assignments || def.orig.length > 1) {
                argname = null;
            }
        } else if (!argname && !compressor.option("keep_fargs") && index < fn.argnames.length + 5) {
            while (index >= fn.argnames.length) {
                argname = fn.create_symbol(AST_SymbolFunarg, {
                    source: fn,
                    scope: fn,
                    tentative_name: "argument_" + fn.argnames.length,
                });
                fn.argnames.push(argname);
            }
        }
        if (argname) {
            var sym = make_node(AST_SymbolRef, self, argname);
            sym.reference({});
            clear_flag(argname, UNUSED);
            return sym;
        }
    }
    if (is_lhs(self, compressor.parent())) return self;
    if (key !== prop) {
        var sub = self.flatten_object(property, compressor);
        if (sub) {
            expr = self.expression = sub.expression;
            prop = self.property = sub.property;
        }
    }
    if (compressor.option("properties") && compressor.option("side_effects")
        && prop instanceof AST_Number && expr instanceof AST_Array) {
        var index = prop.getValue();
        var elements = expr.elements;
        var retValue = elements[index];
        FLATTEN: if (safe_to_flatten(retValue, compressor)) {
            var flatten = true;
            var values = [];
            for (var i = elements.length; --i > index;) {
                var value = elements[i].drop_side_effect_free(compressor);
                if (value) {
                    values.unshift(value);
                    if (flatten && value.has_side_effects(compressor)) flatten = false;
                }
            }
            if (retValue instanceof AST_Expansion) break FLATTEN;
            retValue = retValue instanceof AST_Hole ? make_node(AST_Undefined, retValue) : retValue;
            if (!flatten) values.unshift(retValue);
            while (--i >= 0) {
                var value = elements[i];
                if (value instanceof AST_Expansion) break FLATTEN;
                value = value.drop_side_effect_free(compressor);
                if (value) values.unshift(value);
                else index--;
            }
            if (flatten) {
                values.push(retValue);
                return make_sequence(self, values).optimize(compressor);
            } else return make_node(AST_Sub, self, {
                expression: make_node(AST_Array, expr, {
                    elements: values
                }),
                property: make_node(AST_Number, prop, {
                    value: index
                })
            });
        }
    }
    var ev = self.evaluate(compressor);
    if (ev !== self) {
        ev = make_node_from_constant(ev, self).optimize(compressor);
        return best_of(compressor, ev, self);
    }
    return self;
});

def_optimize(AST_Chain, function (self, compressor) {
    if (is_nullish(self.expression, compressor)) {
        let parent = compressor.parent();
        // It's valid to delete a nullish optional chain, but if we optimized
        // this to `delete undefined` then it would appear to be a syntax error
        // when we try to optimize the delete. Thankfully, `delete 0` is fine.
        if (parent instanceof AST_UnaryPrefix && parent.operator === "delete") {
            return make_node_from_constant(0, self);
        }
        return make_node(AST_Undefined, self);
    }
    return self;
});

AST_Lambda.DEFMETHOD("contains_this", function() {
    return walk(this, node => {
        if (node instanceof AST_This) return walk_abort;
        if (
            node !== this
            && node instanceof AST_Scope
            && !(node instanceof AST_Arrow)
        ) {
            return true;
        }
    });
});

def_optimize(AST_Dot, function(self, compressor) {
    const parent = compressor.parent();
    if (is_lhs(self, parent)) return self;
    if (compressor.option("unsafe_proto")
        && self.expression instanceof AST_Dot
        && self.expression.property == "prototype") {
        var exp = self.expression.expression;
        if (is_undeclared_ref(exp)) switch (exp.name) {
          case "Array":
            self.expression = make_node(AST_Array, self.expression, {
                elements: []
            });
            break;
          case "Function":
            self.expression = make_node(AST_Function, self.expression, {
                argnames: [],
                body: []
            });
            break;
          case "Number":
            self.expression = make_node(AST_Number, self.expression, {
                value: 0
            });
            break;
          case "Object":
            self.expression = make_node(AST_Object, self.expression, {
                properties: []
            });
            break;
          case "RegExp":
            self.expression = make_node(AST_RegExp, self.expression, {
                value: { source: "t", flags: "" }
            });
            break;
          case "String":
            self.expression = make_node(AST_String, self.expression, {
                value: ""
            });
            break;
        }
    }
    if (!(parent instanceof AST_Call) || !has_annotation(parent, _NOINLINE)) {
        const sub = self.flatten_object(self.property, compressor);
        if (sub) return sub.optimize(compressor);
    }

    if (self.expression instanceof AST_PropAccess
        && parent instanceof AST_PropAccess) {
        return self;
    }

    let ev = self.evaluate(compressor);
    if (ev !== self) {
        ev = make_node_from_constant(ev, self).optimize(compressor);
        return best_of(compressor, ev, self);
    }
    return self;
});

function literals_in_boolean_context(self, compressor) {
    if (compressor.in_boolean_context()) {
        return best_of(compressor, self, make_sequence(self, [
            self,
            make_node(AST_True, self)
        ]).optimize(compressor));
    }
    return self;
}

function inline_array_like_spread(elements) {
    for (var i = 0; i < elements.length; i++) {
        var el = elements[i];
        if (el instanceof AST_Expansion) {
            var expr = el.expression;
            if (
                expr instanceof AST_Array
                && !expr.elements.some(elm => elm instanceof AST_Hole)
            ) {
                elements.splice(i, 1, ...expr.elements);
                // Step back one, as the element at i is now new.
                i--;
            }
            // In array-like spread, spreading a non-iterable value is TypeError.
            // We therefore can’t optimize anything else, unlike with object spread.
        }
    }
}

def_optimize(AST_Array, function(self, compressor) {
    var optimized = literals_in_boolean_context(self, compressor);
    if (optimized !== self) {
        return optimized;
    }
    inline_array_like_spread(self.elements);
    return self;
});

function inline_object_prop_spread(props, compressor) {
    for (var i = 0; i < props.length; i++) {
        var prop = props[i];
        if (prop instanceof AST_Expansion) {
            const expr = prop.expression;
            if (
                expr instanceof AST_Object
                && expr.properties.every(prop => prop instanceof AST_ObjectKeyVal)
            ) {
                props.splice(i, 1, ...expr.properties);
                // Step back one, as the property at i is now new.
                i--;
            } else if (expr instanceof AST_Constant
                && !(expr instanceof AST_String)) {
                // Unlike array-like spread, in object spread, spreading a
                // non-iterable value silently does nothing; it is thus safe
                // to remove. AST_String is the only iterable AST_Constant.
                props.splice(i, 1);
                i--;
            } else if (is_nullish(expr, compressor)) {
                // Likewise, null and undefined can be silently removed.
                props.splice(i, 1);
                i--;
            }
        }
    }
}

def_optimize(AST_Object, function(self, compressor) {
    var optimized = literals_in_boolean_context(self, compressor);
    if (optimized !== self) {
        return optimized;
    }
    inline_object_prop_spread(self.properties, compressor);
    return self;
});

def_optimize(AST_RegExp, literals_in_boolean_context);

def_optimize(AST_Return, function(self, compressor) {
    if (self.value && is_undefined(self.value, compressor)) {
        self.value = null;
    }
    return self;
});

def_optimize(AST_Arrow, opt_AST_Lambda);

def_optimize(AST_Function, function(self, compressor) {
    self = opt_AST_Lambda(self, compressor);
    if (compressor.option("unsafe_arrows")
        && compressor.option("ecma") >= 2015
        && !self.name
        && !self.is_generator
        && !self.uses_arguments
        && !self.pinned()) {
        const uses_this = walk(self, node => {
            if (node instanceof AST_This) return walk_abort;
        });
        if (!uses_this) return make_node(AST_Arrow, self, self).optimize(compressor);
    }
    return self;
});

def_optimize(AST_Class, function(self) {
    // HACK to avoid compress failure.
    // AST_Class is not really an AST_Scope/AST_Block as it lacks a body.
    return self;
});

def_optimize(AST_ClassStaticBlock, function(self, compressor) {
    tighten_body(self.body, compressor);
    return self;
});

def_optimize(AST_Yield, function(self, compressor) {
    if (self.expression && !self.is_star && is_undefined(self.expression, compressor)) {
        self.expression = null;
    }
    return self;
});

def_optimize(AST_TemplateString, function(self, compressor) {
    if (
        !compressor.option("evaluate")
        || compressor.parent() instanceof AST_PrefixedTemplateString
    ) {
        return self;
    }

    var segments = [];
    for (var i = 0; i < self.segments.length; i++) {
        var segment = self.segments[i];
        if (segment instanceof AST_Node) {
            var result = segment.evaluate(compressor);
            // Evaluate to constant value
            // Constant value shorter than ${segment}
            if (result !== segment && (result + "").length <= segment.size() + "${}".length) {
                // There should always be a previous and next segment if segment is a node
                segments[segments.length - 1].value = segments[segments.length - 1].value + result + self.segments[++i].value;
                continue;
            }
            // `before ${`innerBefore ${any} innerAfter`} after` => `before innerBefore ${any} innerAfter after`
            // TODO:
            // `before ${'test' + foo} after` => `before innerBefore ${any} innerAfter after`
            // `before ${foo + 'test} after` => `before innerBefore ${any} innerAfter after`
            if (segment instanceof AST_TemplateString) {
                var inners = segment.segments;
                segments[segments.length - 1].value += inners[0].value;
                for (var j = 1; j < inners.length; j++) {
                    segment = inners[j];
                    segments.push(segment);
                }
                continue;
            }
        }
        segments.push(segment);
    }
    self.segments = segments;

    // `foo` => "foo"
    if (segments.length == 1) {
        return make_node(AST_String, self, segments[0]);
    }

    if (
        segments.length === 3
        && segments[1] instanceof AST_Node
        && (
            segments[1].is_string(compressor)
            || segments[1].is_number(compressor)
            || is_nullish(segments[1], compressor)
            || compressor.option("unsafe")
        )
    ) {
        // `foo${bar}` => "foo" + bar
        if (segments[2].value === "") {
            return make_node(AST_Binary, self, {
                operator: "+",
                left: make_node(AST_String, self, {
                    value: segments[0].value,
                }),
                right: segments[1],
            });
        }
        // `${bar}baz` => bar + "baz"
        if (segments[0].value === "") {
            return make_node(AST_Binary, self, {
                operator: "+",
                left: segments[1],
                right: make_node(AST_String, self, {
                    value: segments[2].value,
                }),
            });
        }
    }
    return self;
});

def_optimize(AST_PrefixedTemplateString, function(self) {
    return self;
});

// ["p"]:1 ---> p:1
// [42]:1 ---> 42:1
function lift_key(self, compressor) {
    if (!compressor.option("computed_props")) return self;
    // save a comparison in the typical case
    if (!(self.key instanceof AST_Constant)) return self;
    // allow certain acceptable props as not all AST_Constants are true constants
    if (self.key instanceof AST_String || self.key instanceof AST_Number) {
        if (self.key.value === "__proto__") return self;
        if (self.key.value == "constructor"
            && compressor.parent() instanceof AST_Class) return self;
        if (self instanceof AST_ObjectKeyVal) {
            self.quote = self.key.quote;
            self.key = self.key.value;
        } else if (self instanceof AST_ClassProperty) {
            self.quote = self.key.quote;
            self.key = make_node(AST_SymbolClassProperty, self.key, {
                name: self.key.value
            });
        } else {
            self.quote = self.key.quote;
            self.key = make_node(AST_SymbolMethod, self.key, {
                name: self.key.value
            });
        }
    }
    return self;
}

def_optimize(AST_ObjectProperty, lift_key);

def_optimize(AST_ConciseMethod, function(self, compressor) {
    lift_key(self, compressor);
    // p(){return x;} ---> p:()=>x
    if (compressor.option("arrows")
        && compressor.parent() instanceof AST_Object
        && !self.is_generator
        && !self.value.uses_arguments
        && !self.value.pinned()
        && self.value.body.length == 1
        && self.value.body[0] instanceof AST_Return
        && self.value.body[0].value
        && !self.value.contains_this()) {
        var arrow = make_node(AST_Arrow, self.value, self.value);
        arrow.async = self.async;
        arrow.is_generator = self.is_generator;
        return make_node(AST_ObjectKeyVal, self, {
            key: self.key instanceof AST_SymbolMethod ? self.key.name : self.key,
            value: arrow,
            quote: self.quote,
        });
    }
    return self;
});

def_optimize(AST_ObjectKeyVal, function(self, compressor) {
    lift_key(self, compressor);
    // p:function(){} ---> p(){}
    // p:function*(){} ---> *p(){}
    // p:async function(){} ---> async p(){}
    // p:()=>{} ---> p(){}
    // p:async()=>{} ---> async p(){}
    var unsafe_methods = compressor.option("unsafe_methods");
    if (unsafe_methods
        && compressor.option("ecma") >= 2015
        && (!(unsafe_methods instanceof RegExp) || unsafe_methods.test(self.key + ""))) {
        var key = self.key;
        var value = self.value;
        var is_arrow_with_block = value instanceof AST_Arrow
            && Array.isArray(value.body)
            && !value.contains_this();
        if ((is_arrow_with_block || value instanceof AST_Function) && !value.name) {
            return make_node(AST_ConciseMethod, self, {
                async: value.async,
                is_generator: value.is_generator,
                key: key instanceof AST_Node ? key : make_node(AST_SymbolMethod, self, {
                    name: key,
                }),
                value: make_node(AST_Accessor, value, value),
                quote: self.quote,
            });
        }
    }
    return self;
});

def_optimize(AST_Destructuring, function(self, compressor) {
    if (compressor.option("pure_getters") == true
        && compressor.option("unused")
        && !self.is_array
        && Array.isArray(self.names)
        && !is_destructuring_export_decl(compressor)
        && !(self.names[self.names.length - 1] instanceof AST_Expansion)) {
        var keep = [];
        for (var i = 0; i < self.names.length; i++) {
            var elem = self.names[i];
            if (!(elem instanceof AST_ObjectKeyVal
                && typeof elem.key == "string"
                && elem.value instanceof AST_SymbolDeclaration
                && !should_retain(compressor, elem.value.definition()))) {
                keep.push(elem);
            }
        }
        if (keep.length != self.names.length) {
            self.names = keep;
        }
    }
    return self;

    function is_destructuring_export_decl(compressor) {
        var ancestors = [/^VarDef$/, /^(Const|Let|Var)$/, /^Export$/];
        for (var a = 0, p = 0, len = ancestors.length; a < len; p++) {
            var parent = compressor.parent(p);
            if (!parent) return false;
            if (a === 0 && parent.TYPE == "Destructuring") continue;
            if (!ancestors[a].test(parent.TYPE)) {
                return false;
            }
            a++;
        }
        return true;
    }

    function should_retain(compressor, def) {
        if (def.references.length) return true;
        if (!def.global) return false;
        if (compressor.toplevel.vars) {
             if (compressor.top_retain) {
                 return compressor.top_retain(def);
             }
             return false;
        }
        return true;
    }
});

const comma = ','.charCodeAt(0);
const semicolon = ';'.charCodeAt(0);
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
const intToChar = new Uint8Array(64); // 64 possible chars.
const charToInteger = new Uint8Array(128); // z is 122 in ASCII
for (let i = 0; i < chars.length; i++) {
    const c = chars.charCodeAt(i);
    charToInteger[c] = i;
    intToChar[i] = c;
}
// Provide a fallback for older environments.
const td = typeof TextDecoder !== 'undefined'
    ? new TextDecoder()
    : typeof Buffer !== 'undefined'
        ? {
            decode(buf) {
                const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
                return out.toString();
            },
        }
        : {
            decode(buf) {
                let out = '';
                for (let i = 0; i < buf.length; i++) {
                    out += String.fromCharCode(buf[i]);
                }
                return out;
            },
        };
function decode(mappings) {
    const state = new Int32Array(5);
    const decoded = [];
    let line = [];
    let sorted = true;
    let lastCol = 0;
    for (let i = 0; i < mappings.length;) {
        const c = mappings.charCodeAt(i);
        if (c === comma) {
            i++;
        }
        else if (c === semicolon) {
            state[0] = lastCol = 0;
            if (!sorted)
                sort(line);
            sorted = true;
            decoded.push(line);
            line = [];
            i++;
        }
        else {
            i = decodeInteger(mappings, i, state, 0); // generatedCodeColumn
            const col = state[0];
            if (col < lastCol)
                sorted = false;
            lastCol = col;
            if (!hasMoreSegments(mappings, i)) {
                line.push([col]);
                continue;
            }
            i = decodeInteger(mappings, i, state, 1); // sourceFileIndex
            i = decodeInteger(mappings, i, state, 2); // sourceCodeLine
            i = decodeInteger(mappings, i, state, 3); // sourceCodeColumn
            if (!hasMoreSegments(mappings, i)) {
                line.push([col, state[1], state[2], state[3]]);
                continue;
            }
            i = decodeInteger(mappings, i, state, 4); // nameIndex
            line.push([col, state[1], state[2], state[3], state[4]]);
        }
    }
    if (!sorted)
        sort(line);
    decoded.push(line);
    return decoded;
}
function decodeInteger(mappings, pos, state, j) {
    let value = 0;
    let shift = 0;
    let integer = 0;
    do {
        const c = mappings.charCodeAt(pos++);
        integer = charToInteger[c];
        value |= (integer & 31) << shift;
        shift += 5;
    } while (integer & 32);
    const shouldNegate = value & 1;
    value >>>= 1;
    if (shouldNegate) {
        value = -0x80000000 | -value;
    }
    state[j] += value;
    return pos;
}
function hasMoreSegments(mappings, i) {
    if (i >= mappings.length)
        return false;
    const c = mappings.charCodeAt(i);
    if (c === comma || c === semicolon)
        return false;
    return true;
}
function sort(line) {
    line.sort(sortComparator$1);
}
function sortComparator$1(a, b) {
    return a[0] - b[0];
}
function encode(decoded) {
    const state = new Int32Array(5);
    let buf = new Uint8Array(1024);
    let pos = 0;
    for (let i = 0; i < decoded.length; i++) {
        const line = decoded[i];
        if (i > 0) {
            buf = reserve(buf, pos, 1);
            buf[pos++] = semicolon;
        }
        if (line.length === 0)
            continue;
        state[0] = 0;
        for (let j = 0; j < line.length; j++) {
            const segment = line[j];
            // We can push up to 5 ints, each int can take at most 7 chars, and we
            // may push a comma.
            buf = reserve(buf, pos, 36);
            if (j > 0)
                buf[pos++] = comma;
            pos = encodeInteger(buf, pos, state, segment, 0); // generatedCodeColumn
            if (segment.length === 1)
                continue;
            pos = encodeInteger(buf, pos, state, segment, 1); // sourceFileIndex
            pos = encodeInteger(buf, pos, state, segment, 2); // sourceCodeLine
            pos = encodeInteger(buf, pos, state, segment, 3); // sourceCodeColumn
            if (segment.length === 4)
                continue;
            pos = encodeInteger(buf, pos, state, segment, 4); // nameIndex
        }
    }
    return td.decode(buf.subarray(0, pos));
}
function reserve(buf, pos, count) {
    if (buf.length > pos + count)
        return buf;
    const swap = new Uint8Array(buf.length * 2);
    swap.set(buf);
    return swap;
}
function encodeInteger(buf, pos, state, segment, j) {
    const next = segment[j];
    let num = next - state[j];
    state[j] = next;
    num = num < 0 ? (-num << 1) | 1 : num << 1;
    do {
        let clamped = num & 0b011111;
        num >>>= 5;
        if (num > 0)
            clamped |= 0b100000;
        buf[pos++] = intToChar[clamped];
    } while (num > 0);
    return pos;
}

// Matches the scheme of a URL, eg "http://"
const schemeRegex = /^[\w+.-]+:\/\//;
/**
 * Matches the parts of a URL:
 * 1. Scheme, including ":", guaranteed.
 * 2. User/password, including "@", optional.
 * 3. Host, guaranteed.
 * 4. Port, including ":", optional.
 * 5. Path, including "/", optional.
 */
const urlRegex = /^([\w+.-]+:)\/\/([^@/#?]*@)?([^:/#?]*)(:\d+)?(\/[^#?]*)?/;
/**
 * File URLs are weird. They dont' need the regular `//` in the scheme, they may or may not start
 * with a leading `/`, they can have a domain (but only if they don't start with a Windows drive).
 *
 * 1. Host, optional.
 * 2. Path, which may inclue "/", guaranteed.
 */
const fileRegex = /^file:(?:\/\/((?![a-z]:)[^/]*)?)?(\/?.*)/i;
function isAbsoluteUrl(input) {
    return schemeRegex.test(input);
}
function isSchemeRelativeUrl(input) {
    return input.startsWith('//');
}
function isAbsolutePath(input) {
    return input.startsWith('/');
}
function isFileUrl(input) {
    return input.startsWith('file:');
}
function parseAbsoluteUrl(input) {
    const match = urlRegex.exec(input);
    return makeUrl(match[1], match[2] || '', match[3], match[4] || '', match[5] || '/');
}
function parseFileUrl(input) {
    const match = fileRegex.exec(input);
    const path = match[2];
    return makeUrl('file:', '', match[1] || '', '', isAbsolutePath(path) ? path : '/' + path);
}
function makeUrl(scheme, user, host, port, path) {
    return {
        scheme,
        user,
        host,
        port,
        path,
        relativePath: false,
    };
}
function parseUrl(input) {
    if (isSchemeRelativeUrl(input)) {
        const url = parseAbsoluteUrl('http:' + input);
        url.scheme = '';
        return url;
    }
    if (isAbsolutePath(input)) {
        const url = parseAbsoluteUrl('http://foo.com' + input);
        url.scheme = '';
        url.host = '';
        return url;
    }
    if (isFileUrl(input))
        return parseFileUrl(input);
    if (isAbsoluteUrl(input))
        return parseAbsoluteUrl(input);
    const url = parseAbsoluteUrl('http://foo.com/' + input);
    url.scheme = '';
    url.host = '';
    url.relativePath = true;
    return url;
}
function stripPathFilename(path) {
    // If a path ends with a parent directory "..", then it's a relative path with excess parent
    // paths. It's not a file, so we can't strip it.
    if (path.endsWith('/..'))
        return path;
    const index = path.lastIndexOf('/');
    return path.slice(0, index + 1);
}
function mergePaths(url, base) {
    // If we're not a relative path, then we're an absolute path, and it doesn't matter what base is.
    if (!url.relativePath)
        return;
    normalizePath(base);
    // If the path is just a "/", then it was an empty path to begin with (remember, we're a relative
    // path).
    if (url.path === '/') {
        url.path = base.path;
    }
    else {
        // Resolution happens relative to the base path's directory, not the file.
        url.path = stripPathFilename(base.path) + url.path;
    }
    // If the base path is absolute, then our path is now absolute too.
    url.relativePath = base.relativePath;
}
/**
 * The path can have empty directories "//", unneeded parents "foo/..", or current directory
 * "foo/.". We need to normalize to a standard representation.
 */
function normalizePath(url) {
    const { relativePath } = url;
    const pieces = url.path.split('/');
    // We need to preserve the first piece always, so that we output a leading slash. The item at
    // pieces[0] is an empty string.
    let pointer = 1;
    // Positive is the number of real directories we've output, used for popping a parent directory.
    // Eg, "foo/bar/.." will have a positive 2, and we can decrement to be left with just "foo".
    let positive = 0;
    // We need to keep a trailing slash if we encounter an empty directory (eg, splitting "foo/" will
    // generate `["foo", ""]` pieces). And, if we pop a parent directory. But once we encounter a
    // real directory, we won't need to append, unless the other conditions happen again.
    let addTrailingSlash = false;
    for (let i = 1; i < pieces.length; i++) {
        const piece = pieces[i];
        // An empty directory, could be a trailing slash, or just a double "//" in the path.
        if (!piece) {
            addTrailingSlash = true;
            continue;
        }
        // If we encounter a real directory, then we don't need to append anymore.
        addTrailingSlash = false;
        // A current directory, which we can always drop.
        if (piece === '.')
            continue;
        // A parent directory, we need to see if there are any real directories we can pop. Else, we
        // have an excess of parents, and we'll need to keep the "..".
        if (piece === '..') {
            if (positive) {
                addTrailingSlash = true;
                positive--;
                pointer--;
            }
            else if (relativePath) {
                // If we're in a relativePath, then we need to keep the excess parents. Else, in an absolute
                // URL, protocol relative URL, or an absolute path, we don't need to keep excess.
                pieces[pointer++] = piece;
            }
            continue;
        }
        // We've encountered a real directory. Move it to the next insertion pointer, which accounts for
        // any popped or dropped directories.
        pieces[pointer++] = piece;
        positive++;
    }
    let path = '';
    for (let i = 1; i < pointer; i++) {
        path += '/' + pieces[i];
    }
    if (!path || (addTrailingSlash && !path.endsWith('/..'))) {
        path += '/';
    }
    url.path = path;
}
/**
 * Attempts to resolve `input` URL/path relative to `base`.
 */
function resolve$1(input, base) {
    if (!input && !base)
        return '';
    const url = parseUrl(input);
    // If we have a base, and the input isn't already an absolute URL, then we need to merge.
    if (base && !url.scheme) {
        const baseUrl = parseUrl(base);
        url.scheme = baseUrl.scheme;
        // If there's no host, then we were just a path.
        if (!url.host) {
            // The host, user, and port are joined, you can't copy one without the others.
            url.user = baseUrl.user;
            url.host = baseUrl.host;
            url.port = baseUrl.port;
        }
        mergePaths(url, baseUrl);
    }
    normalizePath(url);
    // If the input (and base, if there was one) are both relative, then we need to output a relative.
    if (url.relativePath) {
        // The first char is always a "/".
        const path = url.path.slice(1);
        if (!path)
            return '.';
        // If base started with a leading ".", or there is no base and input started with a ".", then we
        // need to ensure that the relative path starts with a ".". We don't know if relative starts
        // with a "..", though, so check before prepending.
        const keepRelative = (base || input).startsWith('.');
        return !keepRelative || path.startsWith('.') ? path : './' + path;
    }
    // If there's no host (and no scheme/user/port), then we need to output an absolute path.
    if (!url.scheme && !url.host)
        return url.path;
    // We're outputting either an absolute URL, or a protocol relative one.
    return `${url.scheme}//${url.user}${url.host}${url.port}${url.path}`;
}

function resolve(input, base) {
    // The base is always treated as a directory, if it's not empty.
    // https://github.com/mozilla/source-map/blob/8cb3ee57/lib/util.js#L327
    // https://github.com/chromium/chromium/blob/da4adbb3/third_party/blink/renderer/devtools/front_end/sdk/SourceMap.js#L400-L401
    if (base && !base.endsWith('/'))
        base += '/';
    return resolve$1(input, base);
}

/**
 * Removes everything after the last "/", but leaves the slash.
 */
function stripFilename(path) {
    if (!path)
        return '';
    const index = path.lastIndexOf('/');
    return path.slice(0, index + 1);
}

const COLUMN$1 = 0;
const SOURCES_INDEX$1 = 1;
const SOURCE_LINE$1 = 2;
const SOURCE_COLUMN$1 = 3;
const NAMES_INDEX$1 = 4;

function maybeSort(mappings, owned) {
    const unsortedIndex = nextUnsortedSegmentLine(mappings, 0);
    if (unsortedIndex === mappings.length)
        return mappings;
    // If we own the array (meaning we parsed it from JSON), then we're free to directly mutate it. If
    // not, we do not want to modify the consumer's input array.
    if (!owned)
        mappings = mappings.slice();
    for (let i = unsortedIndex; i < mappings.length; i = nextUnsortedSegmentLine(mappings, i + 1)) {
        mappings[i] = sortSegments(mappings[i], owned);
    }
    return mappings;
}
function nextUnsortedSegmentLine(mappings, start) {
    for (let i = start; i < mappings.length; i++) {
        if (!isSorted(mappings[i]))
            return i;
    }
    return mappings.length;
}
function isSorted(line) {
    for (let j = 1; j < line.length; j++) {
        if (line[j][COLUMN$1] < line[j - 1][COLUMN$1]) {
            return false;
        }
    }
    return true;
}
function sortSegments(line, owned) {
    if (!owned)
        line = line.slice();
    return line.sort(sortComparator);
}
function sortComparator(a, b) {
    return a[COLUMN$1] - b[COLUMN$1];
}

let found = false;
/**
 * A binary search implementation that returns the index if a match is found.
 * If no match is found, then the left-index (the index associated with the item that comes just
 * before the desired index) is returned. To maintain proper sort order, a splice would happen at
 * the next index:
 *
 * ```js
 * const array = [1, 3];
 * const needle = 2;
 * const index = binarySearch(array, needle, (item, needle) => item - needle);
 *
 * assert.equal(index, 0);
 * array.splice(index + 1, 0, needle);
 * assert.deepEqual(array, [1, 2, 3]);
 * ```
 */
function binarySearch(haystack, needle, low, high) {
    while (low <= high) {
        const mid = low + ((high - low) >> 1);
        const cmp = haystack[mid][COLUMN$1] - needle;
        if (cmp === 0) {
            found = true;
            return mid;
        }
        if (cmp < 0) {
            low = mid + 1;
        }
        else {
            high = mid - 1;
        }
    }
    found = false;
    return low - 1;
}
function upperBound(haystack, needle, index) {
    for (let i = index + 1; i < haystack.length; i++, index++) {
        if (haystack[i][COLUMN$1] !== needle)
            break;
    }
    return index;
}
function lowerBound(haystack, needle, index) {
    for (let i = index - 1; i >= 0; i--, index--) {
        if (haystack[i][COLUMN$1] !== needle)
            break;
    }
    return index;
}
function memoizedState() {
    return {
        lastKey: -1,
        lastNeedle: -1,
        lastIndex: -1,
    };
}
/**
 * This overly complicated beast is just to record the last tested line/column and the resulting
 * index, allowing us to skip a few tests if mappings are monotonically increasing.
 */
function memoizedBinarySearch(haystack, needle, state, key) {
    const { lastKey, lastNeedle, lastIndex } = state;
    let low = 0;
    let high = haystack.length - 1;
    if (key === lastKey) {
        if (needle === lastNeedle) {
            found = lastIndex !== -1 && haystack[lastIndex][COLUMN$1] === needle;
            return lastIndex;
        }
        if (needle >= lastNeedle) {
            // lastIndex may be -1 if the previous needle was not found.
            low = lastIndex === -1 ? 0 : lastIndex;
        }
        else {
            high = lastIndex;
        }
    }
    state.lastKey = key;
    state.lastNeedle = needle;
    return (state.lastIndex = binarySearch(haystack, needle, low, high));
}

const AnyMap = function (map, mapUrl) {
    const parsed = typeof map === 'string' ? JSON.parse(map) : map;
    if (!('sections' in parsed))
        return new TraceMap(parsed, mapUrl);
    const mappings = [];
    const sources = [];
    const sourcesContent = [];
    const names = [];
    const { sections } = parsed;
    let i = 0;
    for (; i < sections.length - 1; i++) {
        const no = sections[i + 1].offset;
        addSection(sections[i], mapUrl, mappings, sources, sourcesContent, names, no.line, no.column);
    }
    if (sections.length > 0) {
        addSection(sections[i], mapUrl, mappings, sources, sourcesContent, names, Infinity, Infinity);
    }
    const joined = {
        version: 3,
        file: parsed.file,
        names,
        sources,
        sourcesContent,
        mappings,
    };
    return presortedDecodedMap(joined);
};
function addSection(section, mapUrl, mappings, sources, sourcesContent, names, stopLine, stopColumn) {
    const map = AnyMap(section.map, mapUrl);
    const { line: lineOffset, column: columnOffset } = section.offset;
    const sourcesOffset = sources.length;
    const namesOffset = names.length;
    const decoded = decodedMappings(map);
    const { resolvedSources } = map;
    append(sources, resolvedSources);
    append(sourcesContent, map.sourcesContent || fillSourcesContent(resolvedSources.length));
    append(names, map.names);
    // If this section jumps forwards several lines, we need to add lines to the output mappings catch up.
    for (let i = mappings.length; i <= lineOffset; i++)
        mappings.push([]);
    // We can only add so many lines before we step into the range that the next section's map
    // controls. When we get to the last line, then we'll start checking the segments to see if
    // they've crossed into the column range.
    const stopI = stopLine - lineOffset;
    const len = Math.min(decoded.length, stopI + 1);
    for (let i = 0; i < len; i++) {
        const line = decoded[i];
        // On the 0th loop, the line will already exist due to a previous section, or the line catch up
        // loop above.
        const out = i === 0 ? mappings[lineOffset] : (mappings[lineOffset + i] = []);
        // On the 0th loop, the section's column offset shifts us forward. On all other lines (since the
        // map can be multiple lines), it doesn't.
        const cOffset = i === 0 ? columnOffset : 0;
        for (let j = 0; j < line.length; j++) {
            const seg = line[j];
            const column = cOffset + seg[COLUMN$1];
            // If this segment steps into the column range that the next section's map controls, we need
            // to stop early.
            if (i === stopI && column >= stopColumn)
                break;
            if (seg.length === 1) {
                out.push([column]);
                continue;
            }
            const sourcesIndex = sourcesOffset + seg[SOURCES_INDEX$1];
            const sourceLine = seg[SOURCE_LINE$1];
            const sourceColumn = seg[SOURCE_COLUMN$1];
            if (seg.length === 4) {
                out.push([column, sourcesIndex, sourceLine, sourceColumn]);
                continue;
            }
            out.push([column, sourcesIndex, sourceLine, sourceColumn, namesOffset + seg[NAMES_INDEX$1]]);
        }
    }
}
function append(arr, other) {
    for (let i = 0; i < other.length; i++)
        arr.push(other[i]);
}
// Sourcemaps don't need to have sourcesContent, and if they don't, we need to create an array of
// equal length to the sources. This is because the sources and sourcesContent are paired arrays,
// where `sourcesContent[i]` is the content of the `sources[i]` file. If we didn't, then joined
// sourcemap would desynchronize the sources/contents.
function fillSourcesContent(len) {
    const sourcesContent = [];
    for (let i = 0; i < len; i++)
        sourcesContent[i] = null;
    return sourcesContent;
}

const INVALID_ORIGINAL_MAPPING = Object.freeze({
    source: null,
    line: null,
    column: null,
    name: null,
});
Object.freeze({
    line: null,
    column: null,
});
const LINE_GTR_ZERO = '`line` must be greater than 0 (lines start at line 1)';
const COL_GTR_EQ_ZERO = '`column` must be greater than or equal to 0 (columns start at column 0)';
const LEAST_UPPER_BOUND = -1;
const GREATEST_LOWER_BOUND = 1;
/**
 * Returns the decoded (array of lines of segments) form of the SourceMap's mappings field.
 */
let decodedMappings;
/**
 * A higher-level API to find the source/line/column associated with a generated line/column
 * (think, from a stack trace). Line is 1-based, but column is 0-based, due to legacy behavior in
 * `source-map` library.
 */
let originalPositionFor;
/**
 * A helper that skips sorting of the input map's mappings array, which can be expensive for larger
 * maps.
 */
let presortedDecodedMap;
class TraceMap {
    constructor(map, mapUrl) {
        this._decodedMemo = memoizedState();
        this._bySources = undefined;
        this._bySourceMemos = undefined;
        const isString = typeof map === 'string';
        if (!isString && map.constructor === TraceMap)
            return map;
        const parsed = (isString ? JSON.parse(map) : map);
        const { version, file, names, sourceRoot, sources, sourcesContent } = parsed;
        this.version = version;
        this.file = file;
        this.names = names;
        this.sourceRoot = sourceRoot;
        this.sources = sources;
        this.sourcesContent = sourcesContent;
        if (sourceRoot || mapUrl) {
            const from = resolve(sourceRoot || '', stripFilename(mapUrl));
            this.resolvedSources = sources.map((s) => resolve(s || '', from));
        }
        else {
            this.resolvedSources = sources.map((s) => s || '');
        }
        const { mappings } = parsed;
        if (typeof mappings === 'string') {
            this._encoded = mappings;
            this._decoded = undefined;
        }
        else {
            this._encoded = undefined;
            this._decoded = maybeSort(mappings, isString);
        }
    }
}
(() => {
    decodedMappings = (map) => {
        return (map._decoded || (map._decoded = decode(map._encoded)));
    };
    originalPositionFor = (map, { line, column, bias }) => {
        line--;
        if (line < 0)
            throw new Error(LINE_GTR_ZERO);
        if (column < 0)
            throw new Error(COL_GTR_EQ_ZERO);
        const decoded = decodedMappings(map);
        // It's common for parent source maps to have pointers to lines that have no
        // mapping (like a "//# sourceMappingURL=") at the end of the child file.
        if (line >= decoded.length)
            return INVALID_ORIGINAL_MAPPING;
        const segment = traceSegmentInternal(decoded[line], map._decodedMemo, line, column, bias || GREATEST_LOWER_BOUND);
        if (segment == null)
            return INVALID_ORIGINAL_MAPPING;
        if (segment.length == 1)
            return INVALID_ORIGINAL_MAPPING;
        const { names, resolvedSources } = map;
        return {
            source: resolvedSources[segment[SOURCES_INDEX$1]],
            line: segment[SOURCE_LINE$1] + 1,
            column: segment[SOURCE_COLUMN$1],
            name: segment.length === 5 ? names[segment[NAMES_INDEX$1]] : null,
        };
    };
    presortedDecodedMap = (map, mapUrl) => {
        const clone = Object.assign({}, map);
        clone.mappings = [];
        const tracer = new TraceMap(clone, mapUrl);
        tracer._decoded = map.mappings;
        return tracer;
    };
})();
function traceSegmentInternal(segments, memo, line, column, bias) {
    let index = memoizedBinarySearch(segments, column, memo, line);
    if (found) {
        index = (bias === LEAST_UPPER_BOUND ? upperBound : lowerBound)(segments, column, index);
    }
    else if (bias === LEAST_UPPER_BOUND)
        index++;
    if (index === -1 || index === segments.length)
        return null;
    return segments[index];
}

/**
 * Gets the index associated with `key` in the backing array, if it is already present.
 */
let get;
/**
 * Puts `key` into the backing array, if it is not already present. Returns
 * the index of the `key` in the backing array.
 */
let put;
/**
 * SetArray acts like a `Set` (allowing only one occurrence of a string `key`), but provides the
 * index of the `key` in the backing array.
 *
 * This is designed to allow synchronizing a second array with the contents of the backing array,
 * like how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`,
 * and there are never duplicates.
 */
class SetArray {
    constructor() {
        this._indexes = { __proto__: null };
        this.array = [];
    }
}
(() => {
    get = (strarr, key) => strarr._indexes[key];
    put = (strarr, key) => {
        // The key may or may not be present. If it is present, it's a number.
        const index = get(strarr, key);
        if (index !== undefined)
            return index;
        const { array, _indexes: indexes } = strarr;
        return (indexes[key] = array.push(key) - 1);
    };
})();

const COLUMN = 0;
const SOURCES_INDEX = 1;
const SOURCE_LINE = 2;
const SOURCE_COLUMN = 3;
const NAMES_INDEX = 4;

const NO_NAME = -1;
/**
 * Same as `addMapping`, but will only add the mapping if it generates useful information in the
 * resulting map. This only works correctly if mappings are added **in order**, meaning you should
 * not add a mapping with a lower generated line/column than one that came before.
 */
let maybeAddMapping;
/**
 * Adds/removes the content of the source file to the source map.
 */
let setSourceContent;
/**
 * Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
 * a sourcemap, or to JSON.stringify.
 */
let toDecodedMap;
/**
 * Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
 * a sourcemap, or to JSON.stringify.
 */
let toEncodedMap;
// This split declaration is only so that terser can elminiate the static initialization block.
let addSegmentInternal;
/**
 * Provides the state to generate a sourcemap.
 */
class GenMapping {
    constructor({ file, sourceRoot } = {}) {
        this._names = new SetArray();
        this._sources = new SetArray();
        this._sourcesContent = [];
        this._mappings = [];
        this.file = file;
        this.sourceRoot = sourceRoot;
    }
}
(() => {
    maybeAddMapping = (map, mapping) => {
        return addMappingInternal(true, map, mapping);
    };
    setSourceContent = (map, source, content) => {
        const { _sources: sources, _sourcesContent: sourcesContent } = map;
        sourcesContent[put(sources, source)] = content;
    };
    toDecodedMap = (map) => {
        const { file, sourceRoot, _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
        removeEmptyFinalLines(mappings);
        return {
            version: 3,
            file: file || undefined,
            names: names.array,
            sourceRoot: sourceRoot || undefined,
            sources: sources.array,
            sourcesContent,
            mappings,
        };
    };
    toEncodedMap = (map) => {
        const decoded = toDecodedMap(map);
        return Object.assign(Object.assign({}, decoded), { mappings: encode(decoded.mappings) });
    };
    // Internal helpers
    addSegmentInternal = (skipable, map, genLine, genColumn, source, sourceLine, sourceColumn, name) => {
        const { _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
        const line = getLine(mappings, genLine);
        const index = getColumnIndex(line, genColumn);
        if (!source) {
            if (skipable && skipSourceless(line, index))
                return;
            return insert(line, index, [genColumn]);
        }
        const sourcesIndex = put(sources, source);
        const namesIndex = name ? put(names, name) : NO_NAME;
        if (sourcesIndex === sourcesContent.length)
            sourcesContent[sourcesIndex] = null;
        if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
            return;
        }
        return insert(line, index, name
            ? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
            : [genColumn, sourcesIndex, sourceLine, sourceColumn]);
    };
})();
function getLine(mappings, index) {
    for (let i = mappings.length; i <= index; i++) {
        mappings[i] = [];
    }
    return mappings[index];
}
function getColumnIndex(line, genColumn) {
    let index = line.length;
    for (let i = index - 1; i >= 0; index = i--) {
        const current = line[i];
        if (genColumn >= current[COLUMN])
            break;
    }
    return index;
}
function insert(array, index, value) {
    for (let i = array.length; i > index; i--) {
        array[i] = array[i - 1];
    }
    array[index] = value;
}
function removeEmptyFinalLines(mappings) {
    const { length } = mappings;
    let len = length;
    for (let i = len - 1; i >= 0; len = i, i--) {
        if (mappings[i].length > 0)
            break;
    }
    if (len < length)
        mappings.length = len;
}
function skipSourceless(line, index) {
    // The start of a line is already sourceless, so adding a sourceless segment to the beginning
    // doesn't generate any useful information.
    if (index === 0)
        return true;
    const prev = line[index - 1];
    // If the previous segment is also sourceless, then adding another sourceless segment doesn't
    // genrate any new information. Else, this segment will end the source/named segment and point to
    // a sourceless position, which is useful.
    return prev.length === 1;
}
function skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex) {
    // A source/named segment at the start of a line gives position at that genColumn
    if (index === 0)
        return false;
    const prev = line[index - 1];
    // If the previous segment is sourceless, then we're transitioning to a source.
    if (prev.length === 1)
        return false;
    // If the previous segment maps to the exact same source position, then this segment doesn't
    // provide any new position information.
    return (sourcesIndex === prev[SOURCES_INDEX] &&
        sourceLine === prev[SOURCE_LINE] &&
        sourceColumn === prev[SOURCE_COLUMN] &&
        namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME));
}
function addMappingInternal(skipable, map, mapping) {
    const { generated, source, original, name } = mapping;
    if (!source) {
        return addSegmentInternal(skipable, map, generated.line - 1, generated.column, null, null, null, null);
    }
    const s = source;
    return addSegmentInternal(skipable, map, generated.line - 1, generated.column, s, original.line - 1, original.column, name);
}

class SourceMapConsumer {
    constructor(map, mapUrl) {
        const trace = (this._map = new AnyMap(map, mapUrl));
        this.file = trace.file;
        this.names = trace.names;
        this.sourceRoot = trace.sourceRoot;
        this.sources = trace.resolvedSources;
        this.sourcesContent = trace.sourcesContent;
    }
    originalPositionFor(needle) {
        return originalPositionFor(this._map, needle);
    }
    destroy() {
        // noop.
    }
}
class SourceMapGenerator {
    constructor(opts) {
        this._map = new GenMapping(opts);
    }
    addMapping(mapping) {
        maybeAddMapping(this._map, mapping);
    }
    setSourceContent(source, content) {
        setSourceContent(this._map, source, content);
    }
    toJSON() {
        return toEncodedMap(this._map);
    }
    toDecodedMap() {
        return toDecodedMap(this._map);
    }
}

/***********************************************************************

  A JavaScript tokenizer / parser / beautifier / compressor.
  https://github.com/mishoo/UglifyJS2

  -------------------------------- (C) ---------------------------------

                           Author: Mihai Bazon
                         <mihai.bazon@gmail.com>
                       http://mihai.bazon.net/blog

  Distributed under the BSD license:

    Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.

 ***********************************************************************/

// a small wrapper around source-map and @jridgewell/source-map
async function SourceMap(options) {
    options = defaults(options, {
        file : null,
        root : null,
        orig : null,
        files: {},
    });

    var orig_map;
    var generator = new SourceMapGenerator({
        file       : options.file,
        sourceRoot : options.root
    });

    let sourcesContent = {__proto__: null};
    let files = options.files;
    for (var name in files) if (HOP(files, name)) {
        sourcesContent[name] = files[name];
    }
    if (options.orig) {
        // We support both @jridgewell/source-map (which has a sync
        // SourceMapConsumer) and source-map (which has an async
        // SourceMapConsumer).
        orig_map = await new SourceMapConsumer(options.orig);
        if (orig_map.sourcesContent) {
            orig_map.sources.forEach(function(source, i) {
                var content = orig_map.sourcesContent[i];
                if (content) {
                    sourcesContent[source] = content;
                }
            });
        }
    }

    function add(source, gen_line, gen_col, orig_line, orig_col, name) {
        let generatedPos = { line: gen_line, column: gen_col };

        if (orig_map) {
            var info = orig_map.originalPositionFor({
                line: orig_line,
                column: orig_col
            });
            if (info.source === null) {
                generator.addMapping({
                    generated: generatedPos,
                    original: null,
                    source: null,
                    name: null
                });
                return;
            }
            source = info.source;
            orig_line = info.line;
            orig_col = info.column;
            name = info.name || name;
        }
        generator.addMapping({
            generated : generatedPos,
            original  : { line: orig_line, column: orig_col },
            source    : source,
            name      : name
        });
        generator.setSourceContent(source, sourcesContent[source]);
    }

    function clean(map) {
        const allNull = map.sourcesContent && map.sourcesContent.every(c => c == null);
        if (allNull) delete map.sourcesContent;
        if (map.file === undefined) delete map.file;
        if (map.sourceRoot === undefined) delete map.sourceRoot;
        return map;
    }

    function getDecoded() {
        if (!generator.toDecodedMap) return null;
        return clean(generator.toDecodedMap());
    }

    function getEncoded() {
        return clean(generator.toJSON());
    }

    function destroy() {
        // @jridgewell/source-map's SourceMapConsumer does not need to be
        // manually freed.
        if (orig_map && orig_map.destroy) orig_map.destroy();
    }

    return {
        add,
        getDecoded,
        getEncoded,
        destroy,
    };
}

var domprops = [
    "$&",
    "$'",
    "$*",
    "$+",
    "$1",
    "$2",
    "$3",
    "$4",
    "$5",
    "$6",
    "$7",
    "$8",
    "$9",
    "$_",
    "$`",
    "$input",
    "-moz-animation",
    "-moz-animation-delay",
    "-moz-animation-direction",
    "-moz-animation-duration",
    "-moz-animation-fill-mode",
    "-moz-animation-iteration-count",
    "-moz-animation-name",
    "-moz-animation-play-state",
    "-moz-animation-timing-function",
    "-moz-appearance",
    "-moz-backface-visibility",
    "-moz-border-end",
    "-moz-border-end-color",
    "-moz-border-end-style",
    "-moz-border-end-width",
    "-moz-border-image",
    "-moz-border-start",
    "-moz-border-start-color",
    "-moz-border-start-style",
    "-moz-border-start-width",
    "-moz-box-align",
    "-moz-box-direction",
    "-moz-box-flex",
    "-moz-box-ordinal-group",
    "-moz-box-orient",
    "-moz-box-pack",
    "-moz-box-sizing",
    "-moz-float-edge",
    "-moz-font-feature-settings",
    "-moz-font-language-override",
    "-moz-force-broken-image-icon",
    "-moz-hyphens",
    "-moz-image-region",
    "-moz-margin-end",
    "-moz-margin-start",
    "-moz-orient",
    "-moz-osx-font-smoothing",
    "-moz-outline-radius",
    "-moz-outline-radius-bottomleft",
    "-moz-outline-radius-bottomright",
    "-moz-outline-radius-topleft",
    "-moz-outline-radius-topright",
    "-moz-padding-end",
    "-moz-padding-start",
    "-moz-perspective",
    "-moz-perspective-origin",
    "-moz-tab-size",
    "-moz-text-size-adjust",
    "-moz-transform",
    "-moz-transform-origin",
    "-moz-transform-style",
    "-moz-transition",
    "-moz-transition-delay",
    "-moz-transition-duration",
    "-moz-transition-property",
    "-moz-transition-timing-function",
    "-moz-user-focus",
    "-moz-user-input",
    "-moz-user-modify",
    "-moz-user-select",
    "-moz-window-dragging",
    "-webkit-align-content",
    "-webkit-align-items",
    "-webkit-align-self",
    "-webkit-animation",
    "-webkit-animation-delay",
    "-webkit-animation-direction",
    "-webkit-animation-duration",
    "-webkit-animation-fill-mode",
    "-webkit-animation-iteration-count",
    "-webkit-animation-name",
    "-webkit-animation-play-state",
    "-webkit-animation-timing-function",
    "-webkit-appearance",
    "-webkit-backface-visibility",
    "-webkit-background-clip",
    "-webkit-background-origin",
    "-webkit-background-size",
    "-webkit-border-bottom-left-radius",
    "-webkit-border-bottom-right-radius",
    "-webkit-border-image",
    "-webkit-border-radius",
    "-webkit-border-top-left-radius",
    "-webkit-border-top-right-radius",
    "-webkit-box-align",
    "-webkit-box-direction",
    "-webkit-box-flex",
    "-webkit-box-ordinal-group",
    "-webkit-box-orient",
    "-webkit-box-pack",
    "-webkit-box-shadow",
    "-webkit-box-sizing",
    "-webkit-filter",
    "-webkit-flex",
    "-webkit-flex-basis",
    "-webkit-flex-direction",
    "-webkit-flex-flow",
    "-webkit-flex-grow",
    "-webkit-flex-shrink",
    "-webkit-flex-wrap",
    "-webkit-justify-content",
    "-webkit-line-clamp",
    "-webkit-mask",
    "-webkit-mask-clip",
    "-webkit-mask-composite",
    "-webkit-mask-image",
    "-webkit-mask-origin",
    "-webkit-mask-position",
    "-webkit-mask-position-x",
    "-webkit-mask-position-y",
    "-webkit-mask-repeat",
    "-webkit-mask-size",
    "-webkit-order",
    "-webkit-perspective",
    "-webkit-perspective-origin",
    "-webkit-text-fill-color",
    "-webkit-text-size-adjust",
    "-webkit-text-stroke",
    "-webkit-text-stroke-color",
    "-webkit-text-stroke-width",
    "-webkit-transform",
    "-webkit-transform-origin",
    "-webkit-transform-style",
    "-webkit-transition",
    "-webkit-transition-delay",
    "-webkit-transition-duration",
    "-webkit-transition-property",
    "-webkit-transition-timing-function",
    "-webkit-user-select",
    "0",
    "1",
    "10",
    "11",
    "12",
    "13",
    "14",
    "15",
    "16",
    "17",
    "18",
    "19",
    "2",
    "20",
    "3",
    "4",
    "5",
    "6",
    "7",
    "8",
    "9",
    "@@iterator",
    "ABORT_ERR",
    "ACTIVE",
    "ACTIVE_ATTRIBUTES",
    "ACTIVE_TEXTURE",
    "ACTIVE_UNIFORMS",
    "ACTIVE_UNIFORM_BLOCKS",
    "ADDITION",
    "ALIASED_LINE_WIDTH_RANGE",
    "ALIASED_POINT_SIZE_RANGE",
    "ALLOW_KEYBOARD_INPUT",
    "ALLPASS",
    "ALPHA",
    "ALPHA_BITS",
    "ALREADY_SIGNALED",
    "ALT_MASK",
    "ALWAYS",
    "ANY_SAMPLES_PASSED",
    "ANY_SAMPLES_PASSED_CONSERVATIVE",
    "ANY_TYPE",
    "ANY_UNORDERED_NODE_TYPE",
    "ARRAY_BUFFER",
    "ARRAY_BUFFER_BINDING",
    "ATTACHED_SHADERS",
    "ATTRIBUTE_NODE",
    "AT_TARGET",
    "AbortController",
    "AbortSignal",
    "AbsoluteOrientationSensor",
    "AbstractRange",
    "Accelerometer",
    "AddSearchProvider",
    "AggregateError",
    "AnalyserNode",
    "Animation",
    "AnimationEffect",
    "AnimationEvent",
    "AnimationPlaybackEvent",
    "AnimationTimeline",
    "AnonXMLHttpRequest",
    "Any",
    "ApplicationCache",
    "ApplicationCacheErrorEvent",
    "Array",
    "ArrayBuffer",
    "ArrayType",
    "Atomics",
    "Attr",
    "Audio",
    "AudioBuffer",
    "AudioBufferSourceNode",
    "AudioContext",
    "AudioDestinationNode",
    "AudioListener",
    "AudioNode",
    "AudioParam",
    "AudioParamMap",
    "AudioProcessingEvent",
    "AudioScheduledSourceNode",
    "AudioStreamTrack",
    "AudioWorklet",
    "AudioWorkletNode",
    "AuthenticatorAssertionResponse",
    "AuthenticatorAttestationResponse",
    "AuthenticatorResponse",
    "AutocompleteErrorEvent",
    "BACK",
    "BAD_BOUNDARYPOINTS_ERR",
    "BAD_REQUEST",
    "BANDPASS",
    "BLEND",
    "BLEND_COLOR",
    "BLEND_DST_ALPHA",
    "BLEND_DST_RGB",
    "BLEND_EQUATION",
    "BLEND_EQUATION_ALPHA",
    "BLEND_EQUATION_RGB",
    "BLEND_SRC_ALPHA",
    "BLEND_SRC_RGB",
    "BLUE_BITS",
    "BLUR",
    "BOOL",
    "BOOLEAN_TYPE",
    "BOOL_VEC2",
    "BOOL_VEC3",
    "BOOL_VEC4",
    "BOTH",
    "BROWSER_DEFAULT_WEBGL",
    "BUBBLING_PHASE",
    "BUFFER_SIZE",
    "BUFFER_USAGE",
    "BYTE",
    "BYTES_PER_ELEMENT",
    "BackgroundFetchManager",
    "BackgroundFetchRecord",
    "BackgroundFetchRegistration",
    "BarProp",
    "BarcodeDetector",
    "BaseAudioContext",
    "BaseHref",
    "BatteryManager",
    "BeforeInstallPromptEvent",
    "BeforeLoadEvent",
    "BeforeUnloadEvent",
    "BigInt",
    "BigInt64Array",
    "BigUint64Array",
    "BiquadFilterNode",
    "Blob",
    "BlobEvent",
    "Bluetooth",
    "BluetoothCharacteristicProperties",
    "BluetoothDevice",
    "BluetoothRemoteGATTCharacteristic",
    "BluetoothRemoteGATTDescriptor",
    "BluetoothRemoteGATTServer",
    "BluetoothRemoteGATTService",
    "BluetoothUUID",
    "Boolean",
    "BroadcastChannel",
    "ByteLengthQueuingStrategy",
    "CAPTURING_PHASE",
    "CCW",
    "CDATASection",
    "CDATA_SECTION_NODE",
    "CHANGE",
    "CHARSET_RULE",
    "CHECKING",
    "CLAMP_TO_EDGE",
    "CLICK",
    "CLOSED",
    "CLOSING",
    "COLOR",
    "COLOR_ATTACHMENT0",
    "COLOR_ATTACHMENT1",
    "COLOR_ATTACHMENT10",
    "COLOR_ATTACHMENT11",
    "COLOR_ATTACHMENT12",
    "COLOR_ATTACHMENT13",
    "COLOR_ATTACHMENT14",
    "COLOR_ATTACHMENT15",
    "COLOR_ATTACHMENT2",
    "COLOR_ATTACHMENT3",
    "COLOR_ATTACHMENT4",
    "COLOR_ATTACHMENT5",
    "COLOR_ATTACHMENT6",
    "COLOR_ATTACHMENT7",
    "COLOR_ATTACHMENT8",
    "COLOR_ATTACHMENT9",
    "COLOR_BUFFER_BIT",
    "COLOR_CLEAR_VALUE",
    "COLOR_WRITEMASK",
    "COMMENT_NODE",
    "COMPARE_REF_TO_TEXTURE",
    "COMPILE_STATUS",
    "COMPLETION_STATUS_KHR",
    "COMPRESSED_RGBA_S3TC_DXT1_EXT",
    "COMPRESSED_RGBA_S3TC_DXT3_EXT",
    "COMPRESSED_RGBA_S3TC_DXT5_EXT",
    "COMPRESSED_RGB_S3TC_DXT1_EXT",
    "COMPRESSED_TEXTURE_FORMATS",
    "CONDITION_SATISFIED",
    "CONFIGURATION_UNSUPPORTED",
    "CONNECTING",
    "CONSTANT_ALPHA",
    "CONSTANT_COLOR",
    "CONSTRAINT_ERR",
    "CONTEXT_LOST_WEBGL",
    "CONTROL_MASK",
    "COPY_READ_BUFFER",
    "COPY_READ_BUFFER_BINDING",
    "COPY_WRITE_BUFFER",
    "COPY_WRITE_BUFFER_BINDING",
    "COUNTER_STYLE_RULE",
    "CSS",
    "CSS2Properties",
    "CSSAnimation",
    "CSSCharsetRule",
    "CSSConditionRule",
    "CSSCounterStyleRule",
    "CSSFontFaceRule",
    "CSSFontFeatureValuesRule",
    "CSSGroupingRule",
    "CSSImageValue",
    "CSSImportRule",
    "CSSKeyframeRule",
    "CSSKeyframesRule",
    "CSSKeywordValue",
    "CSSMathInvert",
    "CSSMathMax",
    "CSSMathMin",
    "CSSMathNegate",
    "CSSMathProduct",
    "CSSMathSum",
    "CSSMathValue",
    "CSSMatrixComponent",
    "CSSMediaRule",
    "CSSMozDocumentRule",
    "CSSNameSpaceRule",
    "CSSNamespaceRule",
    "CSSNumericArray",
    "CSSNumericValue",
    "CSSPageRule",
    "CSSPerspective",
    "CSSPositionValue",
    "CSSPrimitiveValue",
    "CSSRotate",
    "CSSRule",
    "CSSRuleList",
    "CSSScale",
    "CSSSkew",
    "CSSSkewX",
    "CSSSkewY",
    "CSSStyleDeclaration",
    "CSSStyleRule",
    "CSSStyleSheet",
    "CSSStyleValue",
    "CSSSupportsRule",
    "CSSTransformComponent",
    "CSSTransformValue",
    "CSSTransition",
    "CSSTranslate",
    "CSSUnitValue",
    "CSSUnknownRule",
    "CSSUnparsedValue",
    "CSSValue",
    "CSSValueList",
    "CSSVariableReferenceValue",
    "CSSVariablesDeclaration",
    "CSSVariablesRule",
    "CSSViewportRule",
    "CSS_ATTR",
    "CSS_CM",
    "CSS_COUNTER",
    "CSS_CUSTOM",
    "CSS_DEG",
    "CSS_DIMENSION",
    "CSS_EMS",
    "CSS_EXS",
    "CSS_FILTER_BLUR",
    "CSS_FILTER_BRIGHTNESS",
    "CSS_FILTER_CONTRAST",
    "CSS_FILTER_CUSTOM",
    "CSS_FILTER_DROP_SHADOW",
    "CSS_FILTER_GRAYSCALE",
    "CSS_FILTER_HUE_ROTATE",
    "CSS_FILTER_INVERT",
    "CSS_FILTER_OPACITY",
    "CSS_FILTER_REFERENCE",
    "CSS_FILTER_SATURATE",
    "CSS_FILTER_SEPIA",
    "CSS_GRAD",
    "CSS_HZ",
    "CSS_IDENT",
    "CSS_IN",
    "CSS_INHERIT",
    "CSS_KHZ",
    "CSS_MATRIX",
    "CSS_MATRIX3D",
    "CSS_MM",
    "CSS_MS",
    "CSS_NUMBER",
    "CSS_PC",
    "CSS_PERCENTAGE",
    "CSS_PERSPECTIVE",
    "CSS_PRIMITIVE_VALUE",
    "CSS_PT",
    "CSS_PX",
    "CSS_RAD",
    "CSS_RECT",
    "CSS_RGBCOLOR",
    "CSS_ROTATE",
    "CSS_ROTATE3D",
    "CSS_ROTATEX",
    "CSS_ROTATEY",
    "CSS_ROTATEZ",
    "CSS_S",
    "CSS_SCALE",
    "CSS_SCALE3D",
    "CSS_SCALEX",
    "CSS_SCALEY",
    "CSS_SCALEZ",
    "CSS_SKEW",
    "CSS_SKEWX",
    "CSS_SKEWY",
    "CSS_STRING",
    "CSS_TRANSLATE",
    "CSS_TRANSLATE3D",
    "CSS_TRANSLATEX",
    "CSS_TRANSLATEY",
    "CSS_TRANSLATEZ",
    "CSS_UNKNOWN",
    "CSS_URI",
    "CSS_VALUE_LIST",
    "CSS_VH",
    "CSS_VMAX",
    "CSS_VMIN",
    "CSS_VW",
    "CULL_FACE",
    "CULL_FACE_MODE",
    "CURRENT_PROGRAM",
    "CURRENT_QUERY",
    "CURRENT_VERTEX_ATTRIB",
    "CUSTOM",
    "CW",
    "Cache",
    "CacheStorage",
    "CanvasCaptureMediaStream",
    "CanvasCaptureMediaStreamTrack",
    "CanvasGradient",
    "CanvasPattern",
    "CanvasRenderingContext2D",
    "CaretPosition",
    "ChannelMergerNode",
    "ChannelSplitterNode",
    "CharacterData",
    "ClientRect",
    "ClientRectList",
    "Clipboard",
    "ClipboardEvent",
    "ClipboardItem",
    "CloseEvent",
    "Collator",
    "CommandEvent",
    "Comment",
    "CompileError",
    "CompositionEvent",
    "CompressionStream",
    "Console",
    "ConstantSourceNode",
    "Controllers",
    "ConvolverNode",
    "CountQueuingStrategy",
    "Counter",
    "Credential",
    "CredentialsContainer",
    "Crypto",
    "CryptoKey",
    "CustomElementRegistry",
    "CustomEvent",
    "DATABASE_ERR",
    "DATA_CLONE_ERR",
    "DATA_ERR",
    "DBLCLICK",
    "DECR",
    "DECR_WRAP",
    "DELETE_STATUS",
    "DEPTH",
    "DEPTH24_STENCIL8",
    "DEPTH32F_STENCIL8",
    "DEPTH_ATTACHMENT",
    "DEPTH_BITS",
    "DEPTH_BUFFER_BIT",
    "DEPTH_CLEAR_VALUE",
    "DEPTH_COMPONENT",
    "DEPTH_COMPONENT16",
    "DEPTH_COMPONENT24",
    "DEPTH_COMPONENT32F",
    "DEPTH_FUNC",
    "DEPTH_RANGE",
    "DEPTH_STENCIL",
    "DEPTH_STENCIL_ATTACHMENT",
    "DEPTH_TEST",
    "DEPTH_WRITEMASK",
    "DEVICE_INELIGIBLE",
    "DIRECTION_DOWN",
    "DIRECTION_LEFT",
    "DIRECTION_RIGHT",
    "DIRECTION_UP",
    "DISABLED",
    "DISPATCH_REQUEST_ERR",
    "DITHER",
    "DOCUMENT_FRAGMENT_NODE",
    "DOCUMENT_NODE",
    "DOCUMENT_POSITION_CONTAINED_BY",
    "DOCUMENT_POSITION_CONTAINS",
    "DOCUMENT_POSITION_DISCONNECTED",
    "DOCUMENT_POSITION_FOLLOWING",
    "DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC",
    "DOCUMENT_POSITION_PRECEDING",
    "DOCUMENT_TYPE_NODE",
    "DOMCursor",
    "DOMError",
    "DOMException",
    "DOMImplementation",
    "DOMImplementationLS",
    "DOMMatrix",
    "DOMMatrixReadOnly",
    "DOMParser",
    "DOMPoint",
    "DOMPointReadOnly",
    "DOMQuad",
    "DOMRect",
    "DOMRectList",
    "DOMRectReadOnly",
    "DOMRequest",
    "DOMSTRING_SIZE_ERR",
    "DOMSettableTokenList",
    "DOMStringList",
    "DOMStringMap",
    "DOMTokenList",
    "DOMTransactionEvent",
    "DOM_DELTA_LINE",
    "DOM_DELTA_PAGE",
    "DOM_DELTA_PIXEL",
    "DOM_INPUT_METHOD_DROP",
    "DOM_INPUT_METHOD_HANDWRITING",
    "DOM_INPUT_METHOD_IME",
    "DOM_INPUT_METHOD_KEYBOARD",
    "DOM_INPUT_METHOD_MULTIMODAL",
    "DOM_INPUT_METHOD_OPTION",
    "DOM_INPUT_METHOD_PASTE",
    "DOM_INPUT_METHOD_SCRIPT",
    "DOM_INPUT_METHOD_UNKNOWN",
    "DOM_INPUT_METHOD_VOICE",
    "DOM_KEY_LOCATION_JOYSTICK",
    "DOM_KEY_LOCATION_LEFT",
    "DOM_KEY_LOCATION_MOBILE",
    "DOM_KEY_LOCATION_NUMPAD",
    "DOM_KEY_LOCATION_RIGHT",
    "DOM_KEY_LOCATION_STANDARD",
    "DOM_VK_0",
    "DOM_VK_1",
    "DOM_VK_2",
    "DOM_VK_3",
    "DOM_VK_4",
    "DOM_VK_5",
    "DOM_VK_6",
    "DOM_VK_7",
    "DOM_VK_8",
    "DOM_VK_9",
    "DOM_VK_A",
    "DOM_VK_ACCEPT",
    "DOM_VK_ADD",
    "DOM_VK_ALT",
    "DOM_VK_ALTGR",
    "DOM_VK_AMPERSAND",
    "DOM_VK_ASTERISK",
    "DOM_VK_AT",
    "DOM_VK_ATTN",
    "DOM_VK_B",
    "DOM_VK_BACKSPACE",
    "DOM_VK_BACK_QUOTE",
    "DOM_VK_BACK_SLASH",
    "DOM_VK_BACK_SPACE",
    "DOM_VK_C",
    "DOM_VK_CANCEL",
    "DOM_VK_CAPS_LOCK",
    "DOM_VK_CIRCUMFLEX",
    "DOM_VK_CLEAR",
    "DOM_VK_CLOSE_BRACKET",
    "DOM_VK_CLOSE_CURLY_BRACKET",
    "DOM_VK_CLOSE_PAREN",
    "DOM_VK_COLON",
    "DOM_VK_COMMA",
    "DOM_VK_CONTEXT_MENU",
    "DOM_VK_CONTROL",
    "DOM_VK_CONVERT",
    "DOM_VK_CRSEL",
    "DOM_VK_CTRL",
    "DOM_VK_D",
    "DOM_VK_DECIMAL",
    "DOM_VK_DELETE",
    "DOM_VK_DIVIDE",
    "DOM_VK_DOLLAR",
    "DOM_VK_DOUBLE_QUOTE",
    "DOM_VK_DOWN",
    "DOM_VK_E",
    "DOM_VK_EISU",
    "DOM_VK_END",
    "DOM_VK_ENTER",
    "DOM_VK_EQUALS",
    "DOM_VK_EREOF",
    "DOM_VK_ESCAPE",
    "DOM_VK_EXCLAMATION",
    "DOM_VK_EXECUTE",
    "DOM_VK_EXSEL",
    "DOM_VK_F",
    "DOM_VK_F1",
    "DOM_VK_F10",
    "DOM_VK_F11",
    "DOM_VK_F12",
    "DOM_VK_F13",
    "DOM_VK_F14",
    "DOM_VK_F15",
    "DOM_VK_F16",
    "DOM_VK_F17",
    "DOM_VK_F18",
    "DOM_VK_F19",
    "DOM_VK_F2",
    "DOM_VK_F20",
    "DOM_VK_F21",
    "DOM_VK_F22",
    "DOM_VK_F23",
    "DOM_VK_F24",
    "DOM_VK_F25",
    "DOM_VK_F26",
    "DOM_VK_F27",
    "DOM_VK_F28",
    "DOM_VK_F29",
    "DOM_VK_F3",
    "DOM_VK_F30",
    "DOM_VK_F31",
    "DOM_VK_F32",
    "DOM_VK_F33",
    "DOM_VK_F34",
    "DOM_VK_F35",
    "DOM_VK_F36",
    "DOM_VK_F4",
    "DOM_VK_F5",
    "DOM_VK_F6",
    "DOM_VK_F7",
    "DOM_VK_F8",
    "DOM_VK_F9",
    "DOM_VK_FINAL",
    "DOM_VK_FRONT",
    "DOM_VK_G",
    "DOM_VK_GREATER_THAN",
    "DOM_VK_H",
    "DOM_VK_HANGUL",
    "DOM_VK_HANJA",
    "DOM_VK_HASH",
    "DOM_VK_HELP",
    "DOM_VK_HK_TOGGLE",
    "DOM_VK_HOME",
    "DOM_VK_HYPHEN_MINUS",
    "DOM_VK_I",
    "DOM_VK_INSERT",
    "DOM_VK_J",
    "DOM_VK_JUNJA",
    "DOM_VK_K",
    "DOM_VK_KANA",
    "DOM_VK_KANJI",
    "DOM_VK_L",
    "DOM_VK_LEFT",
    "DOM_VK_LEFT_TAB",
    "DOM_VK_LESS_THAN",
    "DOM_VK_M",
    "DOM_VK_META",
    "DOM_VK_MODECHANGE",
    "DOM_VK_MULTIPLY",
    "DOM_VK_N",
    "DOM_VK_NONCONVERT",
    "DOM_VK_NUMPAD0",
    "DOM_VK_NUMPAD1",
    "DOM_VK_NUMPAD2",
    "DOM_VK_NUMPAD3",
    "DOM_VK_NUMPAD4",
    "DOM_VK_NUMPAD5",
    "DOM_VK_NUMPAD6",
    "DOM_VK_NUMPAD7",
    "DOM_VK_NUMPAD8",
    "DOM_VK_NUMPAD9",
    "DOM_VK_NUM_LOCK",
    "DOM_VK_O",
    "DOM_VK_OEM_1",
    "DOM_VK_OEM_102",
    "DOM_VK_OEM_2",
    "DOM_VK_OEM_3",
    "DOM_VK_OEM_4",
    "DOM_VK_OEM_5",
    "DOM_VK_OEM_6",
    "DOM_VK_OEM_7",
    "DOM_VK_OEM_8",
    "DOM_VK_OEM_COMMA",
    "DOM_VK_OEM_MINUS",
    "DOM_VK_OEM_PERIOD",
    "DOM_VK_OEM_PLUS",
    "DOM_VK_OPEN_BRACKET",
    "DOM_VK_OPEN_CURLY_BRACKET",
    "DOM_VK_OPEN_PAREN",
    "DOM_VK_P",
    "DOM_VK_PA1",
    "DOM_VK_PAGEDOWN",
    "DOM_VK_PAGEUP",
    "DOM_VK_PAGE_DOWN",
    "DOM_VK_PAGE_UP",
    "DOM_VK_PAUSE",
    "DOM_VK_PERCENT",
    "DOM_VK_PERIOD",
    "DOM_VK_PIPE",
    "DOM_VK_PLAY",
    "DOM_VK_PLUS",
    "DOM_VK_PRINT",
    "DOM_VK_PRINTSCREEN",
    "DOM_VK_PROCESSKEY",
    "DOM_VK_PROPERITES",
    "DOM_VK_Q",
    "DOM_VK_QUESTION_MARK",
    "DOM_VK_QUOTE",
    "DOM_VK_R",
    "DOM_VK_REDO",
    "DOM_VK_RETURN",
    "DOM_VK_RIGHT",
    "DOM_VK_S",
    "DOM_VK_SCROLL_LOCK",
    "DOM_VK_SELECT",
    "DOM_VK_SEMICOLON",
    "DOM_VK_SEPARATOR",
    "DOM_VK_SHIFT",
    "DOM_VK_SLASH",
    "DOM_VK_SLEEP",
    "DOM_VK_SPACE",
    "DOM_VK_SUBTRACT",
    "DOM_VK_T",
    "DOM_VK_TAB",
    "DOM_VK_TILDE",
    "DOM_VK_U",
    "DOM_VK_UNDERSCORE",
    "DOM_VK_UNDO",
    "DOM_VK_UNICODE",
    "DOM_VK_UP",
    "DOM_VK_V",
    "DOM_VK_VOLUME_DOWN",
    "DOM_VK_VOLUME_MUTE",
    "DOM_VK_VOLUME_UP",
    "DOM_VK_W",
    "DOM_VK_WIN",
    "DOM_VK_WINDOW",
    "DOM_VK_WIN_ICO_00",
    "DOM_VK_WIN_ICO_CLEAR",
    "DOM_VK_WIN_ICO_HELP",
    "DOM_VK_WIN_OEM_ATTN",
    "DOM_VK_WIN_OEM_AUTO",
    "DOM_VK_WIN_OEM_BACKTAB",
    "DOM_VK_WIN_OEM_CLEAR",
    "DOM_VK_WIN_OEM_COPY",
    "DOM_VK_WIN_OEM_CUSEL",
    "DOM_VK_WIN_OEM_ENLW",
    "DOM_VK_WIN_OEM_FINISH",
    "DOM_VK_WIN_OEM_FJ_JISHO",
    "DOM_VK_WIN_OEM_FJ_LOYA",
    "DOM_VK_WIN_OEM_FJ_MASSHOU",
    "DOM_VK_WIN_OEM_FJ_ROYA",
    "DOM_VK_WIN_OEM_FJ_TOUROKU",
    "DOM_VK_WIN_OEM_JUMP",
    "DOM_VK_WIN_OEM_PA1",
    "DOM_VK_WIN_OEM_PA2",
    "DOM_VK_WIN_OEM_PA3",
    "DOM_VK_WIN_OEM_RESET",
    "DOM_VK_WIN_OEM_WSCTRL",
    "DOM_VK_X",
    "DOM_VK_XF86XK_ADD_FAVORITE",
    "DOM_VK_XF86XK_APPLICATION_LEFT",
    "DOM_VK_XF86XK_APPLICATION_RIGHT",
    "DOM_VK_XF86XK_AUDIO_CYCLE_TRACK",
    "DOM_VK_XF86XK_AUDIO_FORWARD",
    "DOM_VK_XF86XK_AUDIO_LOWER_VOLUME",
    "DOM_VK_XF86XK_AUDIO_MEDIA",
    "DOM_VK_XF86XK_AUDIO_MUTE",
    "DOM_VK_XF86XK_AUDIO_NEXT",
    "DOM_VK_XF86XK_AUDIO_PAUSE",
    "DOM_VK_XF86XK_AUDIO_PLAY",
    "DOM_VK_XF86XK_AUDIO_PREV",
    "DOM_VK_XF86XK_AUDIO_RAISE_VOLUME",
    "DOM_VK_XF86XK_AUDIO_RANDOM_PLAY",
    "DOM_VK_XF86XK_AUDIO_RECORD",
    "DOM_VK_XF86XK_AUDIO_REPEAT",
    "DOM_VK_XF86XK_AUDIO_REWIND",
    "DOM_VK_XF86XK_AUDIO_STOP",
    "DOM_VK_XF86XK_AWAY",
    "DOM_VK_XF86XK_BACK",
    "DOM_VK_XF86XK_BACK_FORWARD",
    "DOM_VK_XF86XK_BATTERY",
    "DOM_VK_XF86XK_BLUE",
    "DOM_VK_XF86XK_BLUETOOTH",
    "DOM_VK_XF86XK_BOOK",
    "DOM_VK_XF86XK_BRIGHTNESS_ADJUST",
    "DOM_VK_XF86XK_CALCULATOR",
    "DOM_VK_XF86XK_CALENDAR",
    "DOM_VK_XF86XK_CD",
    "DOM_VK_XF86XK_CLOSE",
    "DOM_VK_XF86XK_COMMUNITY",
    "DOM_VK_XF86XK_CONTRAST_ADJUST",
    "DOM_VK_XF86XK_COPY",
    "DOM_VK_XF86XK_CUT",
    "DOM_VK_XF86XK_CYCLE_ANGLE",
    "DOM_VK_XF86XK_DISPLAY",
    "DOM_VK_XF86XK_DOCUMENTS",
    "DOM_VK_XF86XK_DOS",
    "DOM_VK_XF86XK_EJECT",
    "DOM_VK_XF86XK_EXCEL",
    "DOM_VK_XF86XK_EXPLORER",
    "DOM_VK_XF86XK_FAVORITES",
    "DOM_VK_XF86XK_FINANCE",
    "DOM_VK_XF86XK_FORWARD",
    "DOM_VK_XF86XK_FRAME_BACK",
    "DOM_VK_XF86XK_FRAME_FORWARD",
    "DOM_VK_XF86XK_GAME",
    "DOM_VK_XF86XK_GO",
    "DOM_VK_XF86XK_GREEN",
    "DOM_VK_XF86XK_HIBERNATE",
    "DOM_VK_XF86XK_HISTORY",
    "DOM_VK_XF86XK_HOME_PAGE",
    "DOM_VK_XF86XK_HOT_LINKS",
    "DOM_VK_XF86XK_I_TOUCH",
    "DOM_VK_XF86XK_KBD_BRIGHTNESS_DOWN",
    "DOM_VK_XF86XK_KBD_BRIGHTNESS_UP",
    "DOM_VK_XF86XK_KBD_LIGHT_ON_OFF",
    "DOM_VK_XF86XK_LAUNCH0",
    "DOM_VK_XF86XK_LAUNCH1",
    "DOM_VK_XF86XK_LAUNCH2",
    "DOM_VK_XF86XK_LAUNCH3",
    "DOM_VK_XF86XK_LAUNCH4",
    "DOM_VK_XF86XK_LAUNCH5",
    "DOM_VK_XF86XK_LAUNCH6",
    "DOM_VK_XF86XK_LAUNCH7",
    "DOM_VK_XF86XK_LAUNCH8",
    "DOM_VK_XF86XK_LAUNCH9",
    "DOM_VK_XF86XK_LAUNCH_A",
    "DOM_VK_XF86XK_LAUNCH_B",
    "DOM_VK_XF86XK_LAUNCH_C",
    "DOM_VK_XF86XK_LAUNCH_D",
    "DOM_VK_XF86XK_LAUNCH_E",
    "DOM_VK_XF86XK_LAUNCH_F",
    "DOM_VK_XF86XK_LIGHT_BULB",
    "DOM_VK_XF86XK_LOG_OFF",
    "DOM_VK_XF86XK_MAIL",
    "DOM_VK_XF86XK_MAIL_FORWARD",
    "DOM_VK_XF86XK_MARKET",
    "DOM_VK_XF86XK_MEETING",
    "DOM_VK_XF86XK_MEMO",
    "DOM_VK_XF86XK_MENU_KB",
    "DOM_VK_XF86XK_MENU_PB",
    "DOM_VK_XF86XK_MESSENGER",
    "DOM_VK_XF86XK_MON_BRIGHTNESS_DOWN",
    "DOM_VK_XF86XK_MON_BRIGHTNESS_UP",
    "DOM_VK_XF86XK_MUSIC",
    "DOM_VK_XF86XK_MY_COMPUTER",
    "DOM_VK_XF86XK_MY_SITES",
    "DOM_VK_XF86XK_NEW",
    "DOM_VK_XF86XK_NEWS",
    "DOM_VK_XF86XK_OFFICE_HOME",
    "DOM_VK_XF86XK_OPEN",
    "DOM_VK_XF86XK_OPEN_URL",
    "DOM_VK_XF86XK_OPTION",
    "DOM_VK_XF86XK_PASTE",
    "DOM_VK_XF86XK_PHONE",
    "DOM_VK_XF86XK_PICTURES",
    "DOM_VK_XF86XK_POWER_DOWN",
    "DOM_VK_XF86XK_POWER_OFF",
    "DOM_VK_XF86XK_RED",
    "DOM_VK_XF86XK_REFRESH",
    "DOM_VK_XF86XK_RELOAD",
    "DOM_VK_XF86XK_REPLY",
    "DOM_VK_XF86XK_ROCKER_DOWN",
    "DOM_VK_XF86XK_ROCKER_ENTER",
    "DOM_VK_XF86XK_ROCKER_UP",
    "DOM_VK_XF86XK_ROTATE_WINDOWS",
    "DOM_VK_XF86XK_ROTATION_KB",
    "DOM_VK_XF86XK_ROTATION_PB",
    "DOM_VK_XF86XK_SAVE",
    "DOM_VK_XF86XK_SCREEN_SAVER",
    "DOM_VK_XF86XK_SCROLL_CLICK",
    "DOM_VK_XF86XK_SCROLL_DOWN",
    "DOM_VK_XF86XK_SCROLL_UP",
    "DOM_VK_XF86XK_SEARCH",
    "DOM_VK_XF86XK_SEND",
    "DOM_VK_XF86XK_SHOP",
    "DOM_VK_XF86XK_SPELL",
    "DOM_VK_XF86XK_SPLIT_SCREEN",
    "DOM_VK_XF86XK_STANDBY",
    "DOM_VK_XF86XK_START",
    "DOM_VK_XF86XK_STOP",
    "DOM_VK_XF86XK_SUBTITLE",
    "DOM_VK_XF86XK_SUPPORT",
    "DOM_VK_XF86XK_SUSPEND",
    "DOM_VK_XF86XK_TASK_PANE",
    "DOM_VK_XF86XK_TERMINAL",
    "DOM_VK_XF86XK_TIME",
    "DOM_VK_XF86XK_TOOLS",
    "DOM_VK_XF86XK_TOP_MENU",
    "DOM_VK_XF86XK_TO_DO_LIST",
    "DOM_VK_XF86XK_TRAVEL",
    "DOM_VK_XF86XK_USER1KB",
    "DOM_VK_XF86XK_USER2KB",
    "DOM_VK_XF86XK_USER_PB",
    "DOM_VK_XF86XK_UWB",
    "DOM_VK_XF86XK_VENDOR_HOME",
    "DOM_VK_XF86XK_VIDEO",
    "DOM_VK_XF86XK_VIEW",
    "DOM_VK_XF86XK_WAKE_UP",
    "DOM_VK_XF86XK_WEB_CAM",
    "DOM_VK_XF86XK_WHEEL_BUTTON",
    "DOM_VK_XF86XK_WLAN",
    "DOM_VK_XF86XK_WORD",
    "DOM_VK_XF86XK_WWW",
    "DOM_VK_XF86XK_XFER",
    "DOM_VK_XF86XK_YELLOW",
    "DOM_VK_XF86XK_ZOOM_IN",
    "DOM_VK_XF86XK_ZOOM_OUT",
    "DOM_VK_Y",
    "DOM_VK_Z",
    "DOM_VK_ZOOM",
    "DONE",
    "DONT_CARE",
    "DOWNLOADING",
    "DRAGDROP",
    "DRAW_BUFFER0",
    "DRAW_BUFFER1",
    "DRAW_BUFFER10",
    "DRAW_BUFFER11",
    "DRAW_BUFFER12",
    "DRAW_BUFFER13",
    "DRAW_BUFFER14",
    "DRAW_BUFFER15",
    "DRAW_BUFFER2",
    "DRAW_BUFFER3",
    "DRAW_BUFFER4",
    "DRAW_BUFFER5",
    "DRAW_BUFFER6",
    "DRAW_BUFFER7",
    "DRAW_BUFFER8",
    "DRAW_BUFFER9",
    "DRAW_FRAMEBUFFER",
    "DRAW_FRAMEBUFFER_BINDING",
    "DST_ALPHA",
    "DST_COLOR",
    "DYNAMIC_COPY",
    "DYNAMIC_DRAW",
    "DYNAMIC_READ",
    "DataChannel",
    "DataTransfer",
    "DataTransferItem",
    "DataTransferItemList",
    "DataView",
    "Date",
    "DateTimeFormat",
    "DecompressionStream",
    "DelayNode",
    "DeprecationReportBody",
    "DesktopNotification",
    "DesktopNotificationCenter",
    "DeviceLightEvent",
    "DeviceMotionEvent",
    "DeviceMotionEventAcceleration",
    "DeviceMotionEventRotationRate",
    "DeviceOrientationEvent",
    "DeviceProximityEvent",
    "DeviceStorage",
    "DeviceStorageChangeEvent",
    "Directory",
    "DisplayNames",
    "Document",
    "DocumentFragment",
    "DocumentTimeline",
    "DocumentType",
    "DragEvent",
    "DynamicsCompressorNode",
    "E",
    "ELEMENT_ARRAY_BUFFER",
    "ELEMENT_ARRAY_BUFFER_BINDING",
    "ELEMENT_NODE",
    "EMPTY",
    "ENCODING_ERR",
    "ENDED",
    "END_TO_END",
    "END_TO_START",
    "ENTITY_NODE",
    "ENTITY_REFERENCE_NODE",
    "EPSILON",
    "EQUAL",
    "EQUALPOWER",
    "ERROR",
    "EXPONENTIAL_DISTANCE",
    "Element",
    "ElementInternals",
    "ElementQuery",
    "EnterPictureInPictureEvent",
    "Entity",
    "EntityReference",
    "Error",
    "ErrorEvent",
    "EvalError",
    "Event",
    "EventException",
    "EventSource",
    "EventTarget",
    "External",
    "FASTEST",
    "FIDOSDK",
    "FILTER_ACCEPT",
    "FILTER_INTERRUPT",
    "FILTER_REJECT",
    "FILTER_SKIP",
    "FINISHED_STATE",
    "FIRST_ORDERED_NODE_TYPE",
    "FLOAT",
    "FLOAT_32_UNSIGNED_INT_24_8_REV",
    "FLOAT_MAT2",
    "FLOAT_MAT2x3",
    "FLOAT_MAT2x4",
    "FLOAT_MAT3",
    "FLOAT_MAT3x2",
    "FLOAT_MAT3x4",
    "FLOAT_MAT4",
    "FLOAT_MAT4x2",
    "FLOAT_MAT4x3",
    "FLOAT_VEC2",
    "FLOAT_VEC3",
    "FLOAT_VEC4",
    "FOCUS",
    "FONT_FACE_RULE",
    "FONT_FEATURE_VALUES_RULE",
    "FRAGMENT_SHADER",
    "FRAGMENT_SHADER_DERIVATIVE_HINT",
    "FRAGMENT_SHADER_DERIVATIVE_HINT_OES",
    "FRAMEBUFFER",
    "FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE",
    "FRAMEBUFFER_ATTACHMENT_BLUE_SIZE",
    "FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING",
    "FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE",
    "FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE",
    "FRAMEBUFFER_ATTACHMENT_GREEN_SIZE",
    "FRAMEBUFFER_ATTACHMENT_OBJECT_NAME",
    "FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE",
    "FRAMEBUFFER_ATTACHMENT_RED_SIZE",
    "FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE",
    "FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE",
    "FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER",
    "FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL",
    "FRAMEBUFFER_BINDING",
    "FRAMEBUFFER_COMPLETE",
    "FRAMEBUFFER_DEFAULT",
    "FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
    "FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
    "FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
    "FRAMEBUFFER_INCOMPLETE_MULTISAMPLE",
    "FRAMEBUFFER_UNSUPPORTED",
    "FRONT",
    "FRONT_AND_BACK",
    "FRONT_FACE",
    "FUNC_ADD",
    "FUNC_REVERSE_SUBTRACT",
    "FUNC_SUBTRACT",
    "FeaturePolicy",
    "FeaturePolicyViolationReportBody",
    "FederatedCredential",
    "Feed",
    "FeedEntry",
    "File",
    "FileError",
    "FileList",
    "FileReader",
    "FileSystem",
    "FileSystemDirectoryEntry",
    "FileSystemDirectoryReader",
    "FileSystemEntry",
    "FileSystemFileEntry",
    "FinalizationRegistry",
    "FindInPage",
    "Float32Array",
    "Float64Array",
    "FocusEvent",
    "FontFace",
    "FontFaceSet",
    "FontFaceSetLoadEvent",
    "FormData",
    "FormDataEvent",
    "FragmentDirective",
    "Function",
    "GENERATE_MIPMAP_HINT",
    "GEQUAL",
    "GREATER",
    "GREEN_BITS",
    "GainNode",
    "Gamepad",
    "GamepadAxisMoveEvent",
    "GamepadButton",
    "GamepadButtonEvent",
    "GamepadEvent",
    "GamepadHapticActuator",
    "GamepadPose",
    "Geolocation",
    "GeolocationCoordinates",
    "GeolocationPosition",
    "GeolocationPositionError",
    "GestureEvent",
    "Global",
    "Gyroscope",
    "HALF_FLOAT",
    "HAVE_CURRENT_DATA",
    "HAVE_ENOUGH_DATA",
    "HAVE_FUTURE_DATA",
    "HAVE_METADATA",
    "HAVE_NOTHING",
    "HEADERS_RECEIVED",
    "HIDDEN",
    "HIERARCHY_REQUEST_ERR",
    "HIGHPASS",
    "HIGHSHELF",
    "HIGH_FLOAT",
    "HIGH_INT",
    "HORIZONTAL",
    "HORIZONTAL_AXIS",
    "HRTF",
    "HTMLAllCollection",
    "HTMLAnchorElement",
    "HTMLAppletElement",
    "HTMLAreaElement",
    "HTMLAudioElement",
    "HTMLBRElement",
    "HTMLBaseElement",
    "HTMLBaseFontElement",
    "HTMLBlockquoteElement",
    "HTMLBodyElement",
    "HTMLButtonElement",
    "HTMLCanvasElement",
    "HTMLCollection",
    "HTMLCommandElement",
    "HTMLContentElement",
    "HTMLDListElement",
    "HTMLDataElement",
    "HTMLDataListElement",
    "HTMLDetailsElement",
    "HTMLDialogElement",
    "HTMLDirectoryElement",
    "HTMLDivElement",
    "HTMLDocument",
    "HTMLElement",
    "HTMLEmbedElement",
    "HTMLFieldSetElement",
    "HTMLFontElement",
    "HTMLFormControlsCollection",
    "HTMLFormElement",
    "HTMLFrameElement",
    "HTMLFrameSetElement",
    "HTMLHRElement",
    "HTMLHeadElement",
    "HTMLHeadingElement",
    "HTMLHtmlElement",
    "HTMLIFrameElement",
    "HTMLImageElement",
    "HTMLInputElement",
    "HTMLIsIndexElement",
    "HTMLKeygenElement",
    "HTMLLIElement",
    "HTMLLabelElement",
    "HTMLLegendElement",
    "HTMLLinkElement",
    "HTMLMapElement",
    "HTMLMarqueeElement",
    "HTMLMediaElement",
    "HTMLMenuElement",
    "HTMLMenuItemElement",
    "HTMLMetaElement",
    "HTMLMeterElement",
    "HTMLModElement",
    "HTMLOListElement",
    "HTMLObjectElement",
    "HTMLOptGroupElement",
    "HTMLOptionElement",
    "HTMLOptionsCollection",
    "HTMLOutputElement",
    "HTMLParagraphElement",
    "HTMLParamElement",
    "HTMLPictureElement",
    "HTMLPreElement",
    "HTMLProgressElement",
    "HTMLPropertiesCollection",
    "HTMLQuoteElement",
    "HTMLScriptElement",
    "HTMLSelectElement",
    "HTMLShadowElement",
    "HTMLSlotElement",
    "HTMLSourceElement",
    "HTMLSpanElement",
    "HTMLStyleElement",
    "HTMLTableCaptionElement",
    "HTMLTableCellElement",
    "HTMLTableColElement",
    "HTMLTableElement",
    "HTMLTableRowElement",
    "HTMLTableSectionElement",
    "HTMLTemplateElement",
    "HTMLTextAreaElement",
    "HTMLTimeElement",
    "HTMLTitleElement",
    "HTMLTrackElement",
    "HTMLUListElement",
    "HTMLUnknownElement",
    "HTMLVideoElement",
    "HashChangeEvent",
    "Headers",
    "History",
    "Hz",
    "ICE_CHECKING",
    "ICE_CLOSED",
    "ICE_COMPLETED",
    "ICE_CONNECTED",
    "ICE_FAILED",
    "ICE_GATHERING",
    "ICE_WAITING",
    "IDBCursor",
    "IDBCursorWithValue",
    "IDBDatabase",
    "IDBDatabaseException",
    "IDBFactory",
    "IDBFileHandle",
    "IDBFileRequest",
    "IDBIndex",
    "IDBKeyRange",
    "IDBMutableFile",
    "IDBObjectStore",
    "IDBOpenDBRequest",
    "IDBRequest",
    "IDBTransaction",
    "IDBVersionChangeEvent",
    "IDLE",
    "IIRFilterNode",
    "IMPLEMENTATION_COLOR_READ_FORMAT",
    "IMPLEMENTATION_COLOR_READ_TYPE",
    "IMPORT_RULE",
    "INCR",
    "INCR_WRAP",
    "INDEX_SIZE_ERR",
    "INT",
    "INTERLEAVED_ATTRIBS",
    "INT_2_10_10_10_REV",
    "INT_SAMPLER_2D",
    "INT_SAMPLER_2D_ARRAY",
    "INT_SAMPLER_3D",
    "INT_SAMPLER_CUBE",
    "INT_VEC2",
    "INT_VEC3",
    "INT_VEC4",
    "INUSE_ATTRIBUTE_ERR",
    "INVALID_ACCESS_ERR",
    "INVALID_CHARACTER_ERR",
    "INVALID_ENUM",
    "INVALID_EXPRESSION_ERR",
    "INVALID_FRAMEBUFFER_OPERATION",
    "INVALID_INDEX",
    "INVALID_MODIFICATION_ERR",
    "INVALID_NODE_TYPE_ERR",
    "INVALID_OPERATION",
    "INVALID_STATE_ERR",
    "INVALID_VALUE",
    "INVERSE_DISTANCE",
    "INVERT",
    "IceCandidate",
    "IdleDeadline",
    "Image",
    "ImageBitmap",
    "ImageBitmapRenderingContext",
    "ImageCapture",
    "ImageData",
    "Infinity",
    "InputDeviceCapabilities",
    "InputDeviceInfo",
    "InputEvent",
    "InputMethodContext",
    "InstallTrigger",
    "InstallTriggerImpl",
    "Instance",
    "Int16Array",
    "Int32Array",
    "Int8Array",
    "Intent",
    "InternalError",
    "IntersectionObserver",
    "IntersectionObserverEntry",
    "Intl",
    "IsSearchProviderInstalled",
    "Iterator",
    "JSON",
    "KEEP",
    "KEYDOWN",
    "KEYFRAMES_RULE",
    "KEYFRAME_RULE",
    "KEYPRESS",
    "KEYUP",
    "KeyEvent",
    "Keyboard",
    "KeyboardEvent",
    "KeyboardLayoutMap",
    "KeyframeEffect",
    "LENGTHADJUST_SPACING",
    "LENGTHADJUST_SPACINGANDGLYPHS",
    "LENGTHADJUST_UNKNOWN",
    "LEQUAL",
    "LESS",
    "LINEAR",
    "LINEAR_DISTANCE",
    "LINEAR_MIPMAP_LINEAR",
    "LINEAR_MIPMAP_NEAREST",
    "LINES",
    "LINE_LOOP",
    "LINE_STRIP",
    "LINE_WIDTH",
    "LINK_STATUS",
    "LIVE",
    "LN10",
    "LN2",
    "LOADED",
    "LOADING",
    "LOG10E",
    "LOG2E",
    "LOWPASS",
    "LOWSHELF",
    "LOW_FLOAT",
    "LOW_INT",
    "LSException",
    "LSParserFilter",
    "LUMINANCE",
    "LUMINANCE_ALPHA",
    "LargestContentfulPaint",
    "LayoutShift",
    "LayoutShiftAttribution",
    "LinearAccelerationSensor",
    "LinkError",
    "ListFormat",
    "LocalMediaStream",
    "Locale",
    "Location",
    "Lock",
    "LockManager",
    "MAX",
    "MAX_3D_TEXTURE_SIZE",
    "MAX_ARRAY_TEXTURE_LAYERS",
    "MAX_CLIENT_WAIT_TIMEOUT_WEBGL",
    "MAX_COLOR_ATTACHMENTS",
    "MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS",
    "MAX_COMBINED_TEXTURE_IMAGE_UNITS",
    "MAX_COMBINED_UNIFORM_BLOCKS",
    "MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS",
    "MAX_CUBE_MAP_TEXTURE_SIZE",
    "MAX_DRAW_BUFFERS",
    "MAX_ELEMENTS_INDICES",
    "MAX_ELEMENTS_VERTICES",
    "MAX_ELEMENT_INDEX",
    "MAX_FRAGMENT_INPUT_COMPONENTS",
    "MAX_FRAGMENT_UNIFORM_BLOCKS",
    "MAX_FRAGMENT_UNIFORM_COMPONENTS",
    "MAX_FRAGMENT_UNIFORM_VECTORS",
    "MAX_PROGRAM_TEXEL_OFFSET",
    "MAX_RENDERBUFFER_SIZE",
    "MAX_SAFE_INTEGER",
    "MAX_SAMPLES",
    "MAX_SERVER_WAIT_TIMEOUT",
    "MAX_TEXTURE_IMAGE_UNITS",
    "MAX_TEXTURE_LOD_BIAS",
    "MAX_TEXTURE_MAX_ANISOTROPY_EXT",
    "MAX_TEXTURE_SIZE",
    "MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS",
    "MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS",
    "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS",
    "MAX_UNIFORM_BLOCK_SIZE",
    "MAX_UNIFORM_BUFFER_BINDINGS",
    "MAX_VALUE",
    "MAX_VARYING_COMPONENTS",
    "MAX_VARYING_VECTORS",
    "MAX_VERTEX_ATTRIBS",
    "MAX_VERTEX_OUTPUT_COMPONENTS",
    "MAX_VERTEX_TEXTURE_IMAGE_UNITS",
    "MAX_VERTEX_UNIFORM_BLOCKS",
    "MAX_VERTEX_UNIFORM_COMPONENTS",
    "MAX_VERTEX_UNIFORM_VECTORS",
    "MAX_VIEWPORT_DIMS",
    "MEDIA_ERR_ABORTED",
    "MEDIA_ERR_DECODE",
    "MEDIA_ERR_ENCRYPTED",
    "MEDIA_ERR_NETWORK",
    "MEDIA_ERR_SRC_NOT_SUPPORTED",
    "MEDIA_KEYERR_CLIENT",
    "MEDIA_KEYERR_DOMAIN",
    "MEDIA_KEYERR_HARDWARECHANGE",
    "MEDIA_KEYERR_OUTPUT",
    "MEDIA_KEYERR_SERVICE",
    "MEDIA_KEYERR_UNKNOWN",
    "MEDIA_RULE",
    "MEDIUM_FLOAT",
    "MEDIUM_INT",
    "META_MASK",
    "MIDIAccess",
    "MIDIConnectionEvent",
    "MIDIInput",
    "MIDIInputMap",
    "MIDIMessageEvent",
    "MIDIOutput",
    "MIDIOutputMap",
    "MIDIPort",
    "MIN",
    "MIN_PROGRAM_TEXEL_OFFSET",
    "MIN_SAFE_INTEGER",
    "MIN_VALUE",
    "MIRRORED_REPEAT",
    "MODE_ASYNCHRONOUS",
    "MODE_SYNCHRONOUS",
    "MODIFICATION",
    "MOUSEDOWN",
    "MOUSEDRAG",
    "MOUSEMOVE",
    "MOUSEOUT",
    "MOUSEOVER",
    "MOUSEUP",
    "MOZ_KEYFRAMES_RULE",
    "MOZ_KEYFRAME_RULE",
    "MOZ_SOURCE_CURSOR",
    "MOZ_SOURCE_ERASER",
    "MOZ_SOURCE_KEYBOARD",
    "MOZ_SOURCE_MOUSE",
    "MOZ_SOURCE_PEN",
    "MOZ_SOURCE_TOUCH",
    "MOZ_SOURCE_UNKNOWN",
    "MSGESTURE_FLAG_BEGIN",
    "MSGESTURE_FLAG_CANCEL",
    "MSGESTURE_FLAG_END",
    "MSGESTURE_FLAG_INERTIA",
    "MSGESTURE_FLAG_NONE",
    "MSPOINTER_TYPE_MOUSE",
    "MSPOINTER_TYPE_PEN",
    "MSPOINTER_TYPE_TOUCH",
    "MS_ASYNC_CALLBACK_STATUS_ASSIGN_DELEGATE",
    "MS_ASYNC_CALLBACK_STATUS_CANCEL",
    "MS_ASYNC_CALLBACK_STATUS_CHOOSEANY",
    "MS_ASYNC_CALLBACK_STATUS_ERROR",
    "MS_ASYNC_CALLBACK_STATUS_JOIN",
    "MS_ASYNC_OP_STATUS_CANCELED",
    "MS_ASYNC_OP_STATUS_ERROR",
    "MS_ASYNC_OP_STATUS_SUCCESS",
    "MS_MANIPULATION_STATE_ACTIVE",
    "MS_MANIPULATION_STATE_CANCELLED",
    "MS_MANIPULATION_STATE_COMMITTED",
    "MS_MANIPULATION_STATE_DRAGGING",
    "MS_MANIPULATION_STATE_INERTIA",
    "MS_MANIPULATION_STATE_PRESELECT",
    "MS_MANIPULATION_STATE_SELECTING",
    "MS_MANIPULATION_STATE_STOPPED",
    "MS_MEDIA_ERR_ENCRYPTED",
    "MS_MEDIA_KEYERR_CLIENT",
    "MS_MEDIA_KEYERR_DOMAIN",
    "MS_MEDIA_KEYERR_HARDWARECHANGE",
    "MS_MEDIA_KEYERR_OUTPUT",
    "MS_MEDIA_KEYERR_SERVICE",
    "MS_MEDIA_KEYERR_UNKNOWN",
    "Map",
    "Math",
    "MathMLElement",
    "MediaCapabilities",
    "MediaCapabilitiesInfo",
    "MediaController",
    "MediaDeviceInfo",
    "MediaDevices",
    "MediaElementAudioSourceNode",
    "MediaEncryptedEvent",
    "MediaError",
    "MediaKeyError",
    "MediaKeyEvent",
    "MediaKeyMessageEvent",
    "MediaKeyNeededEvent",
    "MediaKeySession",
    "MediaKeyStatusMap",
    "MediaKeySystemAccess",
    "MediaKeys",
    "MediaList",
    "MediaMetadata",
    "MediaQueryList",
    "MediaQueryListEvent",
    "MediaRecorder",
    "MediaRecorderErrorEvent",
    "MediaSession",
    "MediaSettingsRange",
    "MediaSource",
    "MediaStream",
    "MediaStreamAudioDestinationNode",
    "MediaStreamAudioSourceNode",
    "MediaStreamEvent",
    "MediaStreamTrack",
    "MediaStreamTrackAudioSourceNode",
    "MediaStreamTrackEvent",
    "Memory",
    "MessageChannel",
    "MessageEvent",
    "MessagePort",
    "Methods",
    "MimeType",
    "MimeTypeArray",
    "Module",
    "MouseEvent",
    "MouseScrollEvent",
    "MozAnimation",
    "MozAnimationDelay",
    "MozAnimationDirection",
    "MozAnimationDuration",
    "MozAnimationFillMode",
    "MozAnimationIterationCount",
    "MozAnimationName",
    "MozAnimationPlayState",
    "MozAnimationTimingFunction",
    "MozAppearance",
    "MozBackfaceVisibility",
    "MozBinding",
    "MozBorderBottomColors",
    "MozBorderEnd",
    "MozBorderEndColor",
    "MozBorderEndStyle",
    "MozBorderEndWidth",
    "MozBorderImage",
    "MozBorderLeftColors",
    "MozBorderRightColors",
    "MozBorderStart",
    "MozBorderStartColor",
    "MozBorderStartStyle",
    "MozBorderStartWidth",
    "MozBorderTopColors",
    "MozBoxAlign",
    "MozBoxDirection",
    "MozBoxFlex",
    "MozBoxOrdinalGroup",
    "MozBoxOrient",
    "MozBoxPack",
    "MozBoxSizing",
    "MozCSSKeyframeRule",
    "MozCSSKeyframesRule",
    "MozColumnCount",
    "MozColumnFill",
    "MozColumnGap",
    "MozColumnRule",
    "MozColumnRuleColor",
    "MozColumnRuleStyle",
    "MozColumnRuleWidth",
    "MozColumnWidth",
    "MozColumns",
    "MozContactChangeEvent",
    "MozFloatEdge",
    "MozFontFeatureSettings",
    "MozFontLanguageOverride",
    "MozForceBrokenImageIcon",
    "MozHyphens",
    "MozImageRegion",
    "MozMarginEnd",
    "MozMarginStart",
    "MozMmsEvent",
    "MozMmsMessage",
    "MozMobileMessageThread",
    "MozOSXFontSmoothing",
    "MozOrient",
    "MozOsxFontSmoothing",
    "MozOutlineRadius",
    "MozOutlineRadiusBottomleft",
    "MozOutlineRadiusBottomright",
    "MozOutlineRadiusTopleft",
    "MozOutlineRadiusTopright",
    "MozPaddingEnd",
    "MozPaddingStart",
    "MozPerspective",
    "MozPerspectiveOrigin",
    "MozPowerManager",
    "MozSettingsEvent",
    "MozSmsEvent",
    "MozSmsMessage",
    "MozStackSizing",
    "MozTabSize",
    "MozTextAlignLast",
    "MozTextDecorationColor",
    "MozTextDecorationLine",
    "MozTextDecorationStyle",
    "MozTextSizeAdjust",
    "MozTransform",
    "MozTransformOrigin",
    "MozTransformStyle",
    "MozTransition",
    "MozTransitionDelay",
    "MozTransitionDuration",
    "MozTransitionProperty",
    "MozTransitionTimingFunction",
    "MozUserFocus",
    "MozUserInput",
    "MozUserModify",
    "MozUserSelect",
    "MozWindowDragging",
    "MozWindowShadow",
    "MutationEvent",
    "MutationObserver",
    "MutationRecord",
    "NAMESPACE_ERR",
    "NAMESPACE_RULE",
    "NEAREST",
    "NEAREST_MIPMAP_LINEAR",
    "NEAREST_MIPMAP_NEAREST",
    "NEGATIVE_INFINITY",
    "NETWORK_EMPTY",
    "NETWORK_ERR",
    "NETWORK_IDLE",
    "NETWORK_LOADED",
    "NETWORK_LOADING",
    "NETWORK_NO_SOURCE",
    "NEVER",
    "NEW",
    "NEXT",
    "NEXT_NO_DUPLICATE",
    "NICEST",
    "NODE_AFTER",
    "NODE_BEFORE",
    "NODE_BEFORE_AND_AFTER",
    "NODE_INSIDE",
    "NONE",
    "NON_TRANSIENT_ERR",
    "NOTATION_NODE",
    "NOTCH",
    "NOTEQUAL",
    "NOT_ALLOWED_ERR",
    "NOT_FOUND_ERR",
    "NOT_READABLE_ERR",
    "NOT_SUPPORTED_ERR",
    "NO_DATA_ALLOWED_ERR",
    "NO_ERR",
    "NO_ERROR",
    "NO_MODIFICATION_ALLOWED_ERR",
    "NUMBER_TYPE",
    "NUM_COMPRESSED_TEXTURE_FORMATS",
    "NaN",
    "NamedNodeMap",
    "NavigationPreloadManager",
    "Navigator",
    "NearbyLinks",
    "NetworkInformation",
    "Node",
    "NodeFilter",
    "NodeIterator",
    "NodeList",
    "Notation",
    "Notification",
    "NotifyPaintEvent",
    "Number",
    "NumberFormat",
    "OBJECT_TYPE",
    "OBSOLETE",
    "OK",
    "ONE",
    "ONE_MINUS_CONSTANT_ALPHA",
    "ONE_MINUS_CONSTANT_COLOR",
    "ONE_MINUS_DST_ALPHA",
    "ONE_MINUS_DST_COLOR",
    "ONE_MINUS_SRC_ALPHA",
    "ONE_MINUS_SRC_COLOR",
    "OPEN",
    "OPENED",
    "OPENING",
    "ORDERED_NODE_ITERATOR_TYPE",
    "ORDERED_NODE_SNAPSHOT_TYPE",
    "OTHER_ERROR",
    "OUT_OF_MEMORY",
    "Object",
    "OfflineAudioCompletionEvent",
    "OfflineAudioContext",
    "OfflineResourceList",
    "OffscreenCanvas",
    "OffscreenCanvasRenderingContext2D",
    "Option",
    "OrientationSensor",
    "OscillatorNode",
    "OverconstrainedError",
    "OverflowEvent",
    "PACK_ALIGNMENT",
    "PACK_ROW_LENGTH",
    "PACK_SKIP_PIXELS",
    "PACK_SKIP_ROWS",
    "PAGE_RULE",
    "PARSE_ERR",
    "PATHSEG_ARC_ABS",
    "PATHSEG_ARC_REL",
    "PATHSEG_CLOSEPATH",
    "PATHSEG_CURVETO_CUBIC_ABS",
    "PATHSEG_CURVETO_CUBIC_REL",
    "PATHSEG_CURVETO_CUBIC_SMOOTH_ABS",
    "PATHSEG_CURVETO_CUBIC_SMOOTH_REL",
    "PATHSEG_CURVETO_QUADRATIC_ABS",
    "PATHSEG_CURVETO_QUADRATIC_REL",
    "PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS",
    "PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL",
    "PATHSEG_LINETO_ABS",
    "PATHSEG_LINETO_HORIZONTAL_ABS",
    "PATHSEG_LINETO_HORIZONTAL_REL",
    "PATHSEG_LINETO_REL",
    "PATHSEG_LINETO_VERTICAL_ABS",
    "PATHSEG_LINETO_VERTICAL_REL",
    "PATHSEG_MOVETO_ABS",
    "PATHSEG_MOVETO_REL",
    "PATHSEG_UNKNOWN",
    "PATH_EXISTS_ERR",
    "PEAKING",
    "PERMISSION_DENIED",
    "PERSISTENT",
    "PI",
    "PIXEL_PACK_BUFFER",
    "PIXEL_PACK_BUFFER_BINDING",
    "PIXEL_UNPACK_BUFFER",
    "PIXEL_UNPACK_BUFFER_BINDING",
    "PLAYING_STATE",
    "POINTS",
    "POLYGON_OFFSET_FACTOR",
    "POLYGON_OFFSET_FILL",
    "POLYGON_OFFSET_UNITS",
    "POSITION_UNAVAILABLE",
    "POSITIVE_INFINITY",
    "PREV",
    "PREV_NO_DUPLICATE",
    "PROCESSING_INSTRUCTION_NODE",
    "PageChangeEvent",
    "PageTransitionEvent",
    "PaintRequest",
    "PaintRequestList",
    "PannerNode",
    "PasswordCredential",
    "Path2D",
    "PaymentAddress",
    "PaymentInstruments",
    "PaymentManager",
    "PaymentMethodChangeEvent",
    "PaymentRequest",
    "PaymentRequestUpdateEvent",
    "PaymentResponse",
    "Performance",
    "PerformanceElementTiming",
    "PerformanceEntry",
    "PerformanceEventTiming",
    "PerformanceLongTaskTiming",
    "PerformanceMark",
    "PerformanceMeasure",
    "PerformanceNavigation",
    "PerformanceNavigationTiming",
    "PerformanceObserver",
    "PerformanceObserverEntryList",
    "PerformancePaintTiming",
    "PerformanceResourceTiming",
    "PerformanceServerTiming",
    "PerformanceTiming",
    "PeriodicSyncManager",
    "PeriodicWave",
    "PermissionStatus",
    "Permissions",
    "PhotoCapabilities",
    "PictureInPictureWindow",
    "Plugin",
    "PluginArray",
    "PluralRules",
    "PointerEvent",
    "PopStateEvent",
    "PopupBlockedEvent",
    "Presentation",
    "PresentationAvailability",
    "PresentationConnection",
    "PresentationConnectionAvailableEvent",
    "PresentationConnectionCloseEvent",
    "PresentationConnectionList",
    "PresentationReceiver",
    "PresentationRequest",
    "ProcessingInstruction",
    "ProgressEvent",
    "Promise",
    "PromiseRejectionEvent",
    "PropertyNodeList",
    "Proxy",
    "PublicKeyCredential",
    "PushManager",
    "PushSubscription",
    "PushSubscriptionOptions",
    "Q",
    "QUERY_RESULT",
    "QUERY_RESULT_AVAILABLE",
    "QUOTA_ERR",
    "QUOTA_EXCEEDED_ERR",
    "QueryInterface",
    "R11F_G11F_B10F",
    "R16F",
    "R16I",
    "R16UI",
    "R32F",
    "R32I",
    "R32UI",
    "R8",
    "R8I",
    "R8UI",
    "R8_SNORM",
    "RASTERIZER_DISCARD",
    "READ_BUFFER",
    "READ_FRAMEBUFFER",
    "READ_FRAMEBUFFER_BINDING",
    "READ_ONLY",
    "READ_ONLY_ERR",
    "READ_WRITE",
    "RED",
    "RED_BITS",
    "RED_INTEGER",
    "REMOVAL",
    "RENDERBUFFER",
    "RENDERBUFFER_ALPHA_SIZE",
    "RENDERBUFFER_BINDING",
    "RENDERBUFFER_BLUE_SIZE",
    "RENDERBUFFER_DEPTH_SIZE",
    "RENDERBUFFER_GREEN_SIZE",
    "RENDERBUFFER_HEIGHT",
    "RENDERBUFFER_INTERNAL_FORMAT",
    "RENDERBUFFER_RED_SIZE",
    "RENDERBUFFER_SAMPLES",
    "RENDERBUFFER_STENCIL_SIZE",
    "RENDERBUFFER_WIDTH",
    "RENDERER",
    "RENDERING_INTENT_ABSOLUTE_COLORIMETRIC",
    "RENDERING_INTENT_AUTO",
    "RENDERING_INTENT_PERCEPTUAL",
    "RENDERING_INTENT_RELATIVE_COLORIMETRIC",
    "RENDERING_INTENT_SATURATION",
    "RENDERING_INTENT_UNKNOWN",
    "REPEAT",
    "REPLACE",
    "RG",
    "RG16F",
    "RG16I",
    "RG16UI",
    "RG32F",
    "RG32I",
    "RG32UI",
    "RG8",
    "RG8I",
    "RG8UI",
    "RG8_SNORM",
    "RGB",
    "RGB10_A2",
    "RGB10_A2UI",
    "RGB16F",
    "RGB16I",
    "RGB16UI",
    "RGB32F",
    "RGB32I",
    "RGB32UI",
    "RGB565",
    "RGB5_A1",
    "RGB8",
    "RGB8I",
    "RGB8UI",
    "RGB8_SNORM",
    "RGB9_E5",
    "RGBA",
    "RGBA16F",
    "RGBA16I",
    "RGBA16UI",
    "RGBA32F",
    "RGBA32I",
    "RGBA32UI",
    "RGBA4",
    "RGBA8",
    "RGBA8I",
    "RGBA8UI",
    "RGBA8_SNORM",
    "RGBA_INTEGER",
    "RGBColor",
    "RGB_INTEGER",
    "RG_INTEGER",
    "ROTATION_CLOCKWISE",
    "ROTATION_COUNTERCLOCKWISE",
    "RTCCertificate",
    "RTCDTMFSender",
    "RTCDTMFToneChangeEvent",
    "RTCDataChannel",
    "RTCDataChannelEvent",
    "RTCDtlsTransport",
    "RTCError",
    "RTCErrorEvent",
    "RTCIceCandidate",
    "RTCIceTransport",
    "RTCPeerConnection",
    "RTCPeerConnectionIceErrorEvent",
    "RTCPeerConnectionIceEvent",
    "RTCRtpReceiver",
    "RTCRtpSender",
    "RTCRtpTransceiver",
    "RTCSctpTransport",
    "RTCSessionDescription",
    "RTCStatsReport",
    "RTCTrackEvent",
    "RadioNodeList",
    "Range",
    "RangeError",
    "RangeException",
    "ReadableStream",
    "ReadableStreamDefaultReader",
    "RecordErrorEvent",
    "Rect",
    "ReferenceError",
    "Reflect",
    "RegExp",
    "RelativeOrientationSensor",
    "RelativeTimeFormat",
    "RemotePlayback",
    "Report",
    "ReportBody",
    "ReportingObserver",
    "Request",
    "ResizeObserver",
    "ResizeObserverEntry",
    "ResizeObserverSize",
    "Response",
    "RuntimeError",
    "SAMPLER_2D",
    "SAMPLER_2D_ARRAY",
    "SAMPLER_2D_ARRAY_SHADOW",
    "SAMPLER_2D_SHADOW",
    "SAMPLER_3D",
    "SAMPLER_BINDING",
    "SAMPLER_CUBE",
    "SAMPLER_CUBE_SHADOW",
    "SAMPLES",
    "SAMPLE_ALPHA_TO_COVERAGE",
    "SAMPLE_BUFFERS",
    "SAMPLE_COVERAGE",
    "SAMPLE_COVERAGE_INVERT",
    "SAMPLE_COVERAGE_VALUE",
    "SAWTOOTH",
    "SCHEDULED_STATE",
    "SCISSOR_BOX",
    "SCISSOR_TEST",
    "SCROLL_PAGE_DOWN",
    "SCROLL_PAGE_UP",
    "SDP_ANSWER",
    "SDP_OFFER",
    "SDP_PRANSWER",
    "SECURITY_ERR",
    "SELECT",
    "SEPARATE_ATTRIBS",
    "SERIALIZE_ERR",
    "SEVERITY_ERROR",
    "SEVERITY_FATAL_ERROR",
    "SEVERITY_WARNING",
    "SHADER_COMPILER",
    "SHADER_TYPE",
    "SHADING_LANGUAGE_VERSION",
    "SHIFT_MASK",
    "SHORT",
    "SHOWING",
    "SHOW_ALL",
    "SHOW_ATTRIBUTE",
    "SHOW_CDATA_SECTION",
    "SHOW_COMMENT",
    "SHOW_DOCUMENT",
    "SHOW_DOCUMENT_FRAGMENT",
    "SHOW_DOCUMENT_TYPE",
    "SHOW_ELEMENT",
    "SHOW_ENTITY",
    "SHOW_ENTITY_REFERENCE",
    "SHOW_NOTATION",
    "SHOW_PROCESSING_INSTRUCTION",
    "SHOW_TEXT",
    "SIGNALED",
    "SIGNED_NORMALIZED",
    "SINE",
    "SOUNDFIELD",
    "SQLException",
    "SQRT1_2",
    "SQRT2",
    "SQUARE",
    "SRC_ALPHA",
    "SRC_ALPHA_SATURATE",
    "SRC_COLOR",
    "SRGB",
    "SRGB8",
    "SRGB8_ALPHA8",
    "START_TO_END",
    "START_TO_START",
    "STATIC_COPY",
    "STATIC_DRAW",
    "STATIC_READ",
    "STENCIL",
    "STENCIL_ATTACHMENT",
    "STENCIL_BACK_FAIL",
    "STENCIL_BACK_FUNC",
    "STENCIL_BACK_PASS_DEPTH_FAIL",
    "STENCIL_BACK_PASS_DEPTH_PASS",
    "STENCIL_BACK_REF",
    "STENCIL_BACK_VALUE_MASK",
    "STENCIL_BACK_WRITEMASK",
    "STENCIL_BITS",
    "STENCIL_BUFFER_BIT",
    "STENCIL_CLEAR_VALUE",
    "STENCIL_FAIL",
    "STENCIL_FUNC",
    "STENCIL_INDEX",
    "STENCIL_INDEX8",
    "STENCIL_PASS_DEPTH_FAIL",
    "STENCIL_PASS_DEPTH_PASS",
    "STENCIL_REF",
    "STENCIL_TEST",
    "STENCIL_VALUE_MASK",
    "STENCIL_WRITEMASK",
    "STREAM_COPY",
    "STREAM_DRAW",
    "STREAM_READ",
    "STRING_TYPE",
    "STYLE_RULE",
    "SUBPIXEL_BITS",
    "SUPPORTS_RULE",
    "SVGAElement",
    "SVGAltGlyphDefElement",
    "SVGAltGlyphElement",
    "SVGAltGlyphItemElement",
    "SVGAngle",
    "SVGAnimateColorElement",
    "SVGAnimateElement",
    "SVGAnimateMotionElement",
    "SVGAnimateTransformElement",
    "SVGAnimatedAngle",
    "SVGAnimatedBoolean",
    "SVGAnimatedEnumeration",
    "SVGAnimatedInteger",
    "SVGAnimatedLength",
    "SVGAnimatedLengthList",
    "SVGAnimatedNumber",
    "SVGAnimatedNumberList",
    "SVGAnimatedPreserveAspectRatio",
    "SVGAnimatedRect",
    "SVGAnimatedString",
    "SVGAnimatedTransformList",
    "SVGAnimationElement",
    "SVGCircleElement",
    "SVGClipPathElement",
    "SVGColor",
    "SVGComponentTransferFunctionElement",
    "SVGCursorElement",
    "SVGDefsElement",
    "SVGDescElement",
    "SVGDiscardElement",
    "SVGDocument",
    "SVGElement",
    "SVGElementInstance",
    "SVGElementInstanceList",
    "SVGEllipseElement",
    "SVGException",
    "SVGFEBlendElement",
    "SVGFEColorMatrixElement",
    "SVGFEComponentTransferElement",
    "SVGFECompositeElement",
    "SVGFEConvolveMatrixElement",
    "SVGFEDiffuseLightingElement",
    "SVGFEDisplacementMapElement",
    "SVGFEDistantLightElement",
    "SVGFEDropShadowElement",
    "SVGFEFloodElement",
    "SVGFEFuncAElement",
    "SVGFEFuncBElement",
    "SVGFEFuncGElement",
    "SVGFEFuncRElement",
    "SVGFEGaussianBlurElement",
    "SVGFEImageElement",
    "SVGFEMergeElement",
    "SVGFEMergeNodeElement",
    "SVGFEMorphologyElement",
    "SVGFEOffsetElement",
    "SVGFEPointLightElement",
    "SVGFESpecularLightingElement",
    "SVGFESpotLightElement",
    "SVGFETileElement",
    "SVGFETurbulenceElement",
    "SVGFilterElement",
    "SVGFontElement",
    "SVGFontFaceElement",
    "SVGFontFaceFormatElement",
    "SVGFontFaceNameElement",
    "SVGFontFaceSrcElement",
    "SVGFontFaceUriElement",
    "SVGForeignObjectElement",
    "SVGGElement",
    "SVGGeometryElement",
    "SVGGlyphElement",
    "SVGGlyphRefElement",
    "SVGGradientElement",
    "SVGGraphicsElement",
    "SVGHKernElement",
    "SVGImageElement",
    "SVGLength",
    "SVGLengthList",
    "SVGLineElement",
    "SVGLinearGradientElement",
    "SVGMPathElement",
    "SVGMarkerElement",
    "SVGMaskElement",
    "SVGMatrix",
    "SVGMetadataElement",
    "SVGMissingGlyphElement",
    "SVGNumber",
    "SVGNumberList",
    "SVGPaint",
    "SVGPathElement",
    "SVGPathSeg",
    "SVGPathSegArcAbs",
    "SVGPathSegArcRel",
    "SVGPathSegClosePath",
    "SVGPathSegCurvetoCubicAbs",
    "SVGPathSegCurvetoCubicRel",
    "SVGPathSegCurvetoCubicSmoothAbs",
    "SVGPathSegCurvetoCubicSmoothRel",
    "SVGPathSegCurvetoQuadraticAbs",
    "SVGPathSegCurvetoQuadraticRel",
    "SVGPathSegCurvetoQuadraticSmoothAbs",
    "SVGPathSegCurvetoQuadraticSmoothRel",
    "SVGPathSegLinetoAbs",
    "SVGPathSegLinetoHorizontalAbs",
    "SVGPathSegLinetoHorizontalRel",
    "SVGPathSegLinetoRel",
    "SVGPathSegLinetoVerticalAbs",
    "SVGPathSegLinetoVerticalRel",
    "SVGPathSegList",
    "SVGPathSegMovetoAbs",
    "SVGPathSegMovetoRel",
    "SVGPatternElement",
    "SVGPoint",
    "SVGPointList",
    "SVGPolygonElement",
    "SVGPolylineElement",
    "SVGPreserveAspectRatio",
    "SVGRadialGradientElement",
    "SVGRect",
    "SVGRectElement",
    "SVGRenderingIntent",
    "SVGSVGElement",
    "SVGScriptElement",
    "SVGSetElement",
    "SVGStopElement",
    "SVGStringList",
    "SVGStyleElement",
    "SVGSwitchElement",
    "SVGSymbolElement",
    "SVGTRefElement",
    "SVGTSpanElement",
    "SVGTextContentElement",
    "SVGTextElement",
    "SVGTextPathElement",
    "SVGTextPositioningElement",
    "SVGTitleElement",
    "SVGTransform",
    "SVGTransformList",
    "SVGUnitTypes",
    "SVGUseElement",
    "SVGVKernElement",
    "SVGViewElement",
    "SVGViewSpec",
    "SVGZoomAndPan",
    "SVGZoomEvent",
    "SVG_ANGLETYPE_DEG",
    "SVG_ANGLETYPE_GRAD",
    "SVG_ANGLETYPE_RAD",
    "SVG_ANGLETYPE_UNKNOWN",
    "SVG_ANGLETYPE_UNSPECIFIED",
    "SVG_CHANNEL_A",
    "SVG_CHANNEL_B",
    "SVG_CHANNEL_G",
    "SVG_CHANNEL_R",
    "SVG_CHANNEL_UNKNOWN",
    "SVG_COLORTYPE_CURRENTCOLOR",
    "SVG_COLORTYPE_RGBCOLOR",
    "SVG_COLORTYPE_RGBCOLOR_ICCCOLOR",
    "SVG_COLORTYPE_UNKNOWN",
    "SVG_EDGEMODE_DUPLICATE",
    "SVG_EDGEMODE_NONE",
    "SVG_EDGEMODE_UNKNOWN",
    "SVG_EDGEMODE_WRAP",
    "SVG_FEBLEND_MODE_COLOR",
    "SVG_FEBLEND_MODE_COLOR_BURN",
    "SVG_FEBLEND_MODE_COLOR_DODGE",
    "SVG_FEBLEND_MODE_DARKEN",
    "SVG_FEBLEND_MODE_DIFFERENCE",
    "SVG_FEBLEND_MODE_EXCLUSION",
    "SVG_FEBLEND_MODE_HARD_LIGHT",
    "SVG_FEBLEND_MODE_HUE",
    "SVG_FEBLEND_MODE_LIGHTEN",
    "SVG_FEBLEND_MODE_LUMINOSITY",
    "SVG_FEBLEND_MODE_MULTIPLY",
    "SVG_FEBLEND_MODE_NORMAL",
    "SVG_FEBLEND_MODE_OVERLAY",
    "SVG_FEBLEND_MODE_SATURATION",
    "SVG_FEBLEND_MODE_SCREEN",
    "SVG_FEBLEND_MODE_SOFT_LIGHT",
    "SVG_FEBLEND_MODE_UNKNOWN",
    "SVG_FECOLORMATRIX_TYPE_HUEROTATE",
    "SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA",
    "SVG_FECOLORMATRIX_TYPE_MATRIX",
    "SVG_FECOLORMATRIX_TYPE_SATURATE",
    "SVG_FECOLORMATRIX_TYPE_UNKNOWN",
    "SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE",
    "SVG_FECOMPONENTTRANSFER_TYPE_GAMMA",
    "SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY",
    "SVG_FECOMPONENTTRANSFER_TYPE_LINEAR",
    "SVG_FECOMPONENTTRANSFER_TYPE_TABLE",
    "SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN",
    "SVG_FECOMPOSITE_OPERATOR_ARITHMETIC",
    "SVG_FECOMPOSITE_OPERATOR_ATOP",
    "SVG_FECOMPOSITE_OPERATOR_IN",
    "SVG_FECOMPOSITE_OPERATOR_OUT",
    "SVG_FECOMPOSITE_OPERATOR_OVER",
    "SVG_FECOMPOSITE_OPERATOR_UNKNOWN",
    "SVG_FECOMPOSITE_OPERATOR_XOR",
    "SVG_INVALID_VALUE_ERR",
    "SVG_LENGTHTYPE_CM",
    "SVG_LENGTHTYPE_EMS",
    "SVG_LENGTHTYPE_EXS",
    "SVG_LENGTHTYPE_IN",
    "SVG_LENGTHTYPE_MM",
    "SVG_LENGTHTYPE_NUMBER",
    "SVG_LENGTHTYPE_PC",
    "SVG_LENGTHTYPE_PERCENTAGE",
    "SVG_LENGTHTYPE_PT",
    "SVG_LENGTHTYPE_PX",
    "SVG_LENGTHTYPE_UNKNOWN",
    "SVG_MARKERUNITS_STROKEWIDTH",
    "SVG_MARKERUNITS_UNKNOWN",
    "SVG_MARKERUNITS_USERSPACEONUSE",
    "SVG_MARKER_ORIENT_ANGLE",
    "SVG_MARKER_ORIENT_AUTO",
    "SVG_MARKER_ORIENT_UNKNOWN",
    "SVG_MASKTYPE_ALPHA",
    "SVG_MASKTYPE_LUMINANCE",
    "SVG_MATRIX_NOT_INVERTABLE",
    "SVG_MEETORSLICE_MEET",
    "SVG_MEETORSLICE_SLICE",
    "SVG_MEETORSLICE_UNKNOWN",
    "SVG_MORPHOLOGY_OPERATOR_DILATE",
    "SVG_MORPHOLOGY_OPERATOR_ERODE",
    "SVG_MORPHOLOGY_OPERATOR_UNKNOWN",
    "SVG_PAINTTYPE_CURRENTCOLOR",
    "SVG_PAINTTYPE_NONE",
    "SVG_PAINTTYPE_RGBCOLOR",
    "SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR",
    "SVG_PAINTTYPE_UNKNOWN",
    "SVG_PAINTTYPE_URI",
    "SVG_PAINTTYPE_URI_CURRENTCOLOR",
    "SVG_PAINTTYPE_URI_NONE",
    "SVG_PAINTTYPE_URI_RGBCOLOR",
    "SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR",
    "SVG_PRESERVEASPECTRATIO_NONE",
    "SVG_PRESERVEASPECTRATIO_UNKNOWN",
    "SVG_PRESERVEASPECTRATIO_XMAXYMAX",
    "SVG_PRESERVEASPECTRATIO_XMAXYMID",
    "SVG_PRESERVEASPECTRATIO_XMAXYMIN",
    "SVG_PRESERVEASPECTRATIO_XMIDYMAX",
    "SVG_PRESERVEASPECTRATIO_XMIDYMID",
    "SVG_PRESERVEASPECTRATIO_XMIDYMIN",
    "SVG_PRESERVEASPECTRATIO_XMINYMAX",
    "SVG_PRESERVEASPECTRATIO_XMINYMID",
    "SVG_PRESERVEASPECTRATIO_XMINYMIN",
    "SVG_SPREADMETHOD_PAD",
    "SVG_SPREADMETHOD_REFLECT",
    "SVG_SPREADMETHOD_REPEAT",
    "SVG_SPREADMETHOD_UNKNOWN",
    "SVG_STITCHTYPE_NOSTITCH",
    "SVG_STITCHTYPE_STITCH",
    "SVG_STITCHTYPE_UNKNOWN",
    "SVG_TRANSFORM_MATRIX",
    "SVG_TRANSFORM_ROTATE",
    "SVG_TRANSFORM_SCALE",
    "SVG_TRANSFORM_SKEWX",
    "SVG_TRANSFORM_SKEWY",
    "SVG_TRANSFORM_TRANSLATE",
    "SVG_TRANSFORM_UNKNOWN",
    "SVG_TURBULENCE_TYPE_FRACTALNOISE",
    "SVG_TURBULENCE_TYPE_TURBULENCE",
    "SVG_TURBULENCE_TYPE_UNKNOWN",
    "SVG_UNIT_TYPE_OBJECTBOUNDINGBOX",
    "SVG_UNIT_TYPE_UNKNOWN",
    "SVG_UNIT_TYPE_USERSPACEONUSE",
    "SVG_WRONG_TYPE_ERR",
    "SVG_ZOOMANDPAN_DISABLE",
    "SVG_ZOOMANDPAN_MAGNIFY",
    "SVG_ZOOMANDPAN_UNKNOWN",
    "SYNC_CONDITION",
    "SYNC_FENCE",
    "SYNC_FLAGS",
    "SYNC_FLUSH_COMMANDS_BIT",
    "SYNC_GPU_COMMANDS_COMPLETE",
    "SYNC_STATUS",
    "SYNTAX_ERR",
    "SavedPages",
    "Screen",
    "ScreenOrientation",
    "Script",
    "ScriptProcessorNode",
    "ScrollAreaEvent",
    "SecurityPolicyViolationEvent",
    "Selection",
    "Sensor",
    "SensorErrorEvent",
    "ServiceWorker",
    "ServiceWorkerContainer",
    "ServiceWorkerRegistration",
    "SessionDescription",
    "Set",
    "ShadowRoot",
    "SharedArrayBuffer",
    "SharedWorker",
    "SimpleGestureEvent",
    "SourceBuffer",
    "SourceBufferList",
    "SpeechSynthesis",
    "SpeechSynthesisErrorEvent",
    "SpeechSynthesisEvent",
    "SpeechSynthesisUtterance",
    "SpeechSynthesisVoice",
    "StaticRange",
    "StereoPannerNode",
    "StopIteration",
    "Storage",
    "StorageEvent",
    "StorageManager",
    "String",
    "StructType",
    "StylePropertyMap",
    "StylePropertyMapReadOnly",
    "StyleSheet",
    "StyleSheetList",
    "SubmitEvent",
    "SubtleCrypto",
    "Symbol",
    "SyncManager",
    "SyntaxError",
    "TEMPORARY",
    "TEXTPATH_METHODTYPE_ALIGN",
    "TEXTPATH_METHODTYPE_STRETCH",
    "TEXTPATH_METHODTYPE_UNKNOWN",
    "TEXTPATH_SPACINGTYPE_AUTO",
    "TEXTPATH_SPACINGTYPE_EXACT",
    "TEXTPATH_SPACINGTYPE_UNKNOWN",
    "TEXTURE",
    "TEXTURE0",
    "TEXTURE1",
    "TEXTURE10",
    "TEXTURE11",
    "TEXTURE12",
    "TEXTURE13",
    "TEXTURE14",
    "TEXTURE15",
    "TEXTURE16",
    "TEXTURE17",
    "TEXTURE18",
    "TEXTURE19",
    "TEXTURE2",
    "TEXTURE20",
    "TEXTURE21",
    "TEXTURE22",
    "TEXTURE23",
    "TEXTURE24",
    "TEXTURE25",
    "TEXTURE26",
    "TEXTURE27",
    "TEXTURE28",
    "TEXTURE29",
    "TEXTURE3",
    "TEXTURE30",
    "TEXTURE31",
    "TEXTURE4",
    "TEXTURE5",
    "TEXTURE6",
    "TEXTURE7",
    "TEXTURE8",
    "TEXTURE9",
    "TEXTURE_2D",
    "TEXTURE_2D_ARRAY",
    "TEXTURE_3D",
    "TEXTURE_BASE_LEVEL",
    "TEXTURE_BINDING_2D",
    "TEXTURE_BINDING_2D_ARRAY",
    "TEXTURE_BINDING_3D",
    "TEXTURE_BINDING_CUBE_MAP",
    "TEXTURE_COMPARE_FUNC",
    "TEXTURE_COMPARE_MODE",
    "TEXTURE_CUBE_MAP",
    "TEXTURE_CUBE_MAP_NEGATIVE_X",
    "TEXTURE_CUBE_MAP_NEGATIVE_Y",
    "TEXTURE_CUBE_MAP_NEGATIVE_Z",
    "TEXTURE_CUBE_MAP_POSITIVE_X",
    "TEXTURE_CUBE_MAP_POSITIVE_Y",
    "TEXTURE_CUBE_MAP_POSITIVE_Z",
    "TEXTURE_IMMUTABLE_FORMAT",
    "TEXTURE_IMMUTABLE_LEVELS",
    "TEXTURE_MAG_FILTER",
    "TEXTURE_MAX_ANISOTROPY_EXT",
    "TEXTURE_MAX_LEVEL",
    "TEXTURE_MAX_LOD",
    "TEXTURE_MIN_FILTER",
    "TEXTURE_MIN_LOD",
    "TEXTURE_WRAP_R",
    "TEXTURE_WRAP_S",
    "TEXTURE_WRAP_T",
    "TEXT_NODE",
    "TIMEOUT",
    "TIMEOUT_ERR",
    "TIMEOUT_EXPIRED",
    "TIMEOUT_IGNORED",
    "TOO_LARGE_ERR",
    "TRANSACTION_INACTIVE_ERR",
    "TRANSFORM_FEEDBACK",
    "TRANSFORM_FEEDBACK_ACTIVE",
    "TRANSFORM_FEEDBACK_BINDING",
    "TRANSFORM_FEEDBACK_BUFFER",
    "TRANSFORM_FEEDBACK_BUFFER_BINDING",
    "TRANSFORM_FEEDBACK_BUFFER_MODE",
    "TRANSFORM_FEEDBACK_BUFFER_SIZE",
    "TRANSFORM_FEEDBACK_BUFFER_START",
    "TRANSFORM_FEEDBACK_PAUSED",
    "TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN",
    "TRANSFORM_FEEDBACK_VARYINGS",
    "TRIANGLE",
    "TRIANGLES",
    "TRIANGLE_FAN",
    "TRIANGLE_STRIP",
    "TYPE_BACK_FORWARD",
    "TYPE_ERR",
    "TYPE_MISMATCH_ERR",
    "TYPE_NAVIGATE",
    "TYPE_RELOAD",
    "TYPE_RESERVED",
    "Table",
    "TaskAttributionTiming",
    "Text",
    "TextDecoder",
    "TextDecoderStream",
    "TextEncoder",
    "TextEncoderStream",
    "TextEvent",
    "TextMetrics",
    "TextTrack",
    "TextTrackCue",
    "TextTrackCueList",
    "TextTrackList",
    "TimeEvent",
    "TimeRanges",
    "Touch",
    "TouchEvent",
    "TouchList",
    "TrackEvent",
    "TransformStream",
    "TransitionEvent",
    "TreeWalker",
    "TrustedHTML",
    "TrustedScript",
    "TrustedScriptURL",
    "TrustedTypePolicy",
    "TrustedTypePolicyFactory",
    "TypeError",
    "TypedObject",
    "U2F",
    "UIEvent",
    "UNCACHED",
    "UNIFORM_ARRAY_STRIDE",
    "UNIFORM_BLOCK_ACTIVE_UNIFORMS",
    "UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES",
    "UNIFORM_BLOCK_BINDING",
    "UNIFORM_BLOCK_DATA_SIZE",
    "UNIFORM_BLOCK_INDEX",
    "UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER",
    "UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER",
    "UNIFORM_BUFFER",
    "UNIFORM_BUFFER_BINDING",
    "UNIFORM_BUFFER_OFFSET_ALIGNMENT",
    "UNIFORM_BUFFER_SIZE",
    "UNIFORM_BUFFER_START",
    "UNIFORM_IS_ROW_MAJOR",
    "UNIFORM_MATRIX_STRIDE",
    "UNIFORM_OFFSET",
    "UNIFORM_SIZE",
    "UNIFORM_TYPE",
    "UNKNOWN_ERR",
    "UNKNOWN_RULE",
    "UNMASKED_RENDERER_WEBGL",
    "UNMASKED_VENDOR_WEBGL",
    "UNORDERED_NODE_ITERATOR_TYPE",
    "UNORDERED_NODE_SNAPSHOT_TYPE",
    "UNPACK_ALIGNMENT",
    "UNPACK_COLORSPACE_CONVERSION_WEBGL",
    "UNPACK_FLIP_Y_WEBGL",
    "UNPACK_IMAGE_HEIGHT",
    "UNPACK_PREMULTIPLY_ALPHA_WEBGL",
    "UNPACK_ROW_LENGTH",
    "UNPACK_SKIP_IMAGES",
    "UNPACK_SKIP_PIXELS",
    "UNPACK_SKIP_ROWS",
    "UNSCHEDULED_STATE",
    "UNSENT",
    "UNSIGNALED",
    "UNSIGNED_BYTE",
    "UNSIGNED_INT",
    "UNSIGNED_INT_10F_11F_11F_REV",
    "UNSIGNED_INT_24_8",
    "UNSIGNED_INT_2_10_10_10_REV",
    "UNSIGNED_INT_5_9_9_9_REV",
    "UNSIGNED_INT_SAMPLER_2D",
    "UNSIGNED_INT_SAMPLER_2D_ARRAY",
    "UNSIGNED_INT_SAMPLER_3D",
    "UNSIGNED_INT_SAMPLER_CUBE",
    "UNSIGNED_INT_VEC2",
    "UNSIGNED_INT_VEC3",
    "UNSIGNED_INT_VEC4",
    "UNSIGNED_NORMALIZED",
    "UNSIGNED_SHORT",
    "UNSIGNED_SHORT_4_4_4_4",
    "UNSIGNED_SHORT_5_5_5_1",
    "UNSIGNED_SHORT_5_6_5",
    "UNSPECIFIED_EVENT_TYPE_ERR",
    "UPDATEREADY",
    "URIError",
    "URL",
    "URLSearchParams",
    "URLUnencoded",
    "URL_MISMATCH_ERR",
    "USB",
    "USBAlternateInterface",
    "USBConfiguration",
    "USBConnectionEvent",
    "USBDevice",
    "USBEndpoint",
    "USBInTransferResult",
    "USBInterface",
    "USBIsochronousInTransferPacket",
    "USBIsochronousInTransferResult",
    "USBIsochronousOutTransferPacket",
    "USBIsochronousOutTransferResult",
    "USBOutTransferResult",
    "UTC",
    "Uint16Array",
    "Uint32Array",
    "Uint8Array",
    "Uint8ClampedArray",
    "UserActivation",
    "UserMessageHandler",
    "UserMessageHandlersNamespace",
    "UserProximityEvent",
    "VALIDATE_STATUS",
    "VALIDATION_ERR",
    "VARIABLES_RULE",
    "VENDOR",
    "VERSION",
    "VERSION_CHANGE",
    "VERSION_ERR",
    "VERTEX_ARRAY_BINDING",
    "VERTEX_ATTRIB_ARRAY_BUFFER_BINDING",
    "VERTEX_ATTRIB_ARRAY_DIVISOR",
    "VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE",
    "VERTEX_ATTRIB_ARRAY_ENABLED",
    "VERTEX_ATTRIB_ARRAY_INTEGER",
    "VERTEX_ATTRIB_ARRAY_NORMALIZED",
    "VERTEX_ATTRIB_ARRAY_POINTER",
    "VERTEX_ATTRIB_ARRAY_SIZE",
    "VERTEX_ATTRIB_ARRAY_STRIDE",
    "VERTEX_ATTRIB_ARRAY_TYPE",
    "VERTEX_SHADER",
    "VERTICAL",
    "VERTICAL_AXIS",
    "VER_ERR",
    "VIEWPORT",
    "VIEWPORT_RULE",
    "VRDisplay",
    "VRDisplayCapabilities",
    "VRDisplayEvent",
    "VREyeParameters",
    "VRFieldOfView",
    "VRFrameData",
    "VRPose",
    "VRStageParameters",
    "VTTCue",
    "VTTRegion",
    "ValidityState",
    "VideoPlaybackQuality",
    "VideoStreamTrack",
    "VisualViewport",
    "WAIT_FAILED",
    "WEBKIT_FILTER_RULE",
    "WEBKIT_KEYFRAMES_RULE",
    "WEBKIT_KEYFRAME_RULE",
    "WEBKIT_REGION_RULE",
    "WRONG_DOCUMENT_ERR",
    "WakeLock",
    "WakeLockSentinel",
    "WasmAnyRef",
    "WaveShaperNode",
    "WeakMap",
    "WeakRef",
    "WeakSet",
    "WebAssembly",
    "WebGL2RenderingContext",
    "WebGLActiveInfo",
    "WebGLBuffer",
    "WebGLContextEvent",
    "WebGLFramebuffer",
    "WebGLProgram",
    "WebGLQuery",
    "WebGLRenderbuffer",
    "WebGLRenderingContext",
    "WebGLSampler",
    "WebGLShader",
    "WebGLShaderPrecisionFormat",
    "WebGLSync",
    "WebGLTexture",
    "WebGLTransformFeedback",
    "WebGLUniformLocation",
    "WebGLVertexArray",
    "WebGLVertexArrayObject",
    "WebKitAnimationEvent",
    "WebKitBlobBuilder",
    "WebKitCSSFilterRule",
    "WebKitCSSFilterValue",
    "WebKitCSSKeyframeRule",
    "WebKitCSSKeyframesRule",
    "WebKitCSSMatrix",
    "WebKitCSSRegionRule",
    "WebKitCSSTransformValue",
    "WebKitDataCue",
    "WebKitGamepad",
    "WebKitMediaKeyError",
    "WebKitMediaKeyMessageEvent",
    "WebKitMediaKeySession",
    "WebKitMediaKeys",
    "WebKitMediaSource",
    "WebKitMutationObserver",
    "WebKitNamespace",
    "WebKitPlaybackTargetAvailabilityEvent",
    "WebKitPoint",
    "WebKitShadowRoot",
    "WebKitSourceBuffer",
    "WebKitSourceBufferList",
    "WebKitTransitionEvent",
    "WebSocket",
    "WebkitAlignContent",
    "WebkitAlignItems",
    "WebkitAlignSelf",
    "WebkitAnimation",
    "WebkitAnimationDelay",
    "WebkitAnimationDirection",
    "WebkitAnimationDuration",
    "WebkitAnimationFillMode",
    "WebkitAnimationIterationCount",
    "WebkitAnimationName",
    "WebkitAnimationPlayState",
    "WebkitAnimationTimingFunction",
    "WebkitAppearance",
    "WebkitBackfaceVisibility",
    "WebkitBackgroundClip",
    "WebkitBackgroundOrigin",
    "WebkitBackgroundSize",
    "WebkitBorderBottomLeftRadius",
    "WebkitBorderBottomRightRadius",
    "WebkitBorderImage",
    "WebkitBorderRadius",
    "WebkitBorderTopLeftRadius",
    "WebkitBorderTopRightRadius",
    "WebkitBoxAlign",
    "WebkitBoxDirection",
    "WebkitBoxFlex",
    "WebkitBoxOrdinalGroup",
    "WebkitBoxOrient",
    "WebkitBoxPack",
    "WebkitBoxShadow",
    "WebkitBoxSizing",
    "WebkitFilter",
    "WebkitFlex",
    "WebkitFlexBasis",
    "WebkitFlexDirection",
    "WebkitFlexFlow",
    "WebkitFlexGrow",
    "WebkitFlexShrink",
    "WebkitFlexWrap",
    "WebkitJustifyContent",
    "WebkitLineClamp",
    "WebkitMask",
    "WebkitMaskClip",
    "WebkitMaskComposite",
    "WebkitMaskImage",
    "WebkitMaskOrigin",
    "WebkitMaskPosition",
    "WebkitMaskPositionX",
    "WebkitMaskPositionY",
    "WebkitMaskRepeat",
    "WebkitMaskSize",
    "WebkitOrder",
    "WebkitPerspective",
    "WebkitPerspectiveOrigin",
    "WebkitTextFillColor",
    "WebkitTextSizeAdjust",
    "WebkitTextStroke",
    "WebkitTextStrokeColor",
    "WebkitTextStrokeWidth",
    "WebkitTransform",
    "WebkitTransformOrigin",
    "WebkitTransformStyle",
    "WebkitTransition",
    "WebkitTransitionDelay",
    "WebkitTransitionDuration",
    "WebkitTransitionProperty",
    "WebkitTransitionTimingFunction",
    "WebkitUserSelect",
    "WheelEvent",
    "Window",
    "Worker",
    "Worklet",
    "WritableStream",
    "WritableStreamDefaultWriter",
    "XMLDocument",
    "XMLHttpRequest",
    "XMLHttpRequestEventTarget",
    "XMLHttpRequestException",
    "XMLHttpRequestProgressEvent",
    "XMLHttpRequestUpload",
    "XMLSerializer",
    "XMLStylesheetProcessingInstruction",
    "XPathEvaluator",
    "XPathException",
    "XPathExpression",
    "XPathNSResolver",
    "XPathResult",
    "XRBoundedReferenceSpace",
    "XRDOMOverlayState",
    "XRFrame",
    "XRHitTestResult",
    "XRHitTestSource",
    "XRInputSource",
    "XRInputSourceArray",
    "XRInputSourceEvent",
    "XRInputSourcesChangeEvent",
    "XRLayer",
    "XRPose",
    "XRRay",
    "XRReferenceSpace",
    "XRReferenceSpaceEvent",
    "XRRenderState",
    "XRRigidTransform",
    "XRSession",
    "XRSessionEvent",
    "XRSpace",
    "XRSystem",
    "XRTransientInputHitTestResult",
    "XRTransientInputHitTestSource",
    "XRView",
    "XRViewerPose",
    "XRViewport",
    "XRWebGLLayer",
    "XSLTProcessor",
    "ZERO",
    "_XD0M_",
    "_YD0M_",
    "__defineGetter__",
    "__defineSetter__",
    "__lookupGetter__",
    "__lookupSetter__",
    "__opera",
    "__proto__",
    "_browserjsran",
    "a",
    "aLink",
    "abbr",
    "abort",
    "aborted",
    "abs",
    "absolute",
    "acceleration",
    "accelerationIncludingGravity",
    "accelerator",
    "accept",
    "acceptCharset",
    "acceptNode",
    "accessKey",
    "accessKeyLabel",
    "accuracy",
    "acos",
    "acosh",
    "action",
    "actionURL",
    "actions",
    "activated",
    "active",
    "activeCues",
    "activeElement",
    "activeSourceBuffers",
    "activeSourceCount",
    "activeTexture",
    "activeVRDisplays",
    "actualBoundingBoxAscent",
    "actualBoundingBoxDescent",
    "actualBoundingBoxLeft",
    "actualBoundingBoxRight",
    "add",
    "addAll",
    "addBehavior",
    "addCandidate",
    "addColorStop",
    "addCue",
    "addElement",
    "addEventListener",
    "addFilter",
    "addFromString",
    "addFromUri",
    "addIceCandidate",
    "addImport",
    "addListener",
    "addModule",
    "addNamed",
    "addPageRule",
    "addPath",
    "addPointer",
    "addRange",
    "addRegion",
    "addRule",
    "addSearchEngine",
    "addSourceBuffer",
    "addStream",
    "addTextTrack",
    "addTrack",
    "addTransceiver",
    "addWakeLockListener",
    "added",
    "addedNodes",
    "additionalName",
    "additiveSymbols",
    "addons",
    "address",
    "addressLine",
    "adoptNode",
    "adoptedStyleSheets",
    "adr",
    "advance",
    "after",
    "album",
    "alert",
    "algorithm",
    "align",
    "align-content",
    "align-items",
    "align-self",
    "alignContent",
    "alignItems",
    "alignSelf",
    "alignmentBaseline",
    "alinkColor",
    "all",
    "allSettled",
    "allow",
    "allowFullscreen",
    "allowPaymentRequest",
    "allowedDirections",
    "allowedFeatures",
    "allowedToPlay",
    "allowsFeature",
    "alpha",
    "alt",
    "altGraphKey",
    "altHtml",
    "altKey",
    "altLeft",
    "alternate",
    "alternateSetting",
    "alternates",
    "altitude",
    "altitudeAccuracy",
    "amplitude",
    "ancestorOrigins",
    "anchor",
    "anchorNode",
    "anchorOffset",
    "anchors",
    "and",
    "angle",
    "angularAcceleration",
    "angularVelocity",
    "animVal",
    "animate",
    "animatedInstanceRoot",
    "animatedNormalizedPathSegList",
    "animatedPathSegList",
    "animatedPoints",
    "animation",
    "animation-delay",
    "animation-direction",
    "animation-duration",
    "animation-fill-mode",
    "animation-iteration-count",
    "animation-name",
    "animation-play-state",
    "animation-timing-function",
    "animationDelay",
    "animationDirection",
    "animationDuration",
    "animationFillMode",
    "animationIterationCount",
    "animationName",
    "animationPlayState",
    "animationStartTime",
    "animationTimingFunction",
    "animationsPaused",
    "anniversary",
    "antialias",
    "anticipatedRemoval",
    "any",
    "app",
    "appCodeName",
    "appMinorVersion",
    "appName",
    "appNotifications",
    "appVersion",
    "appearance",
    "append",
    "appendBuffer",
    "appendChild",
    "appendData",
    "appendItem",
    "appendMedium",
    "appendNamed",
    "appendRule",
    "appendStream",
    "appendWindowEnd",
    "appendWindowStart",
    "applets",
    "applicationCache",
    "applicationServerKey",
    "apply",
    "applyConstraints",
    "applyElement",
    "arc",
    "arcTo",
    "architecture",
    "archive",
    "areas",
    "arguments",
    "ariaAtomic",
    "ariaAutoComplete",
    "ariaBusy",
    "ariaChecked",
    "ariaColCount",
    "ariaColIndex",
    "ariaColSpan",
    "ariaCurrent",
    "ariaDescription",
    "ariaDisabled",
    "ariaExpanded",
    "ariaHasPopup",
    "ariaHidden",
    "ariaKeyShortcuts",
    "ariaLabel",
    "ariaLevel",
    "ariaLive",
    "ariaModal",
    "ariaMultiLine",
    "ariaMultiSelectable",
    "ariaOrientation",
    "ariaPlaceholder",
    "ariaPosInSet",
    "ariaPressed",
    "ariaReadOnly",
    "ariaRelevant",
    "ariaRequired",
    "ariaRoleDescription",
    "ariaRowCount",
    "ariaRowIndex",
    "ariaRowSpan",
    "ariaSelected",
    "ariaSetSize",
    "ariaSort",
    "ariaValueMax",
    "ariaValueMin",
    "ariaValueNow",
    "ariaValueText",
    "arrayBuffer",
    "artist",
    "artwork",
    "as",
    "asIntN",
    "asUintN",
    "asin",
    "asinh",
    "assert",
    "assign",
    "assignedElements",
    "assignedNodes",
    "assignedSlot",
    "async",
    "asyncIterator",
    "atEnd",
    "atan",
    "atan2",
    "atanh",
    "atob",
    "attachEvent",
    "attachInternals",
    "attachShader",
    "attachShadow",
    "attachments",
    "attack",
    "attestationObject",
    "attrChange",
    "attrName",
    "attributeFilter",
    "attributeName",
    "attributeNamespace",
    "attributeOldValue",
    "attributeStyleMap",
    "attributes",
    "attribution",
    "audioBitsPerSecond",
    "audioTracks",
    "audioWorklet",
    "authenticatedSignedWrites",
    "authenticatorData",
    "autoIncrement",
    "autobuffer",
    "autocapitalize",
    "autocomplete",
    "autocorrect",
    "autofocus",
    "automationRate",
    "autoplay",
    "availHeight",
    "availLeft",
    "availTop",
    "availWidth",
    "availability",
    "available",
    "aversion",
    "ax",
    "axes",
    "axis",
    "ay",
    "azimuth",
    "b",
    "back",
    "backface-visibility",
    "backfaceVisibility",
    "background",
    "background-attachment",
    "background-blend-mode",
    "background-clip",
    "background-color",
    "background-image",
    "background-origin",
    "background-position",
    "background-position-x",
    "background-position-y",
    "background-repeat",
    "background-size",
    "backgroundAttachment",
    "backgroundBlendMode",
    "backgroundClip",
    "backgroundColor",
    "backgroundFetch",
    "backgroundImage",
    "backgroundOrigin",
    "backgroundPosition",
    "backgroundPositionX",
    "backgroundPositionY",
    "backgroundRepeat",
    "backgroundSize",
    "badInput",
    "badge",
    "balance",
    "baseFrequencyX",
    "baseFrequencyY",
    "baseLatency",
    "baseLayer",
    "baseNode",
    "baseOffset",
    "baseURI",
    "baseVal",
    "baselineShift",
    "battery",
    "bday",
    "before",
    "beginElement",
    "beginElementAt",
    "beginPath",
    "beginQuery",
    "beginTransformFeedback",
    "behavior",
    "behaviorCookie",
    "behaviorPart",
    "behaviorUrns",
    "beta",
    "bezierCurveTo",
    "bgColor",
    "bgProperties",
    "bias",
    "big",
    "bigint64",
    "biguint64",
    "binaryType",
    "bind",
    "bindAttribLocation",
    "bindBuffer",
    "bindBufferBase",
    "bindBufferRange",
    "bindFramebuffer",
    "bindRenderbuffer",
    "bindSampler",
    "bindTexture",
    "bindTransformFeedback",
    "bindVertexArray",
    "bitness",
    "blendColor",
    "blendEquation",
    "blendEquationSeparate",
    "blendFunc",
    "blendFuncSeparate",
    "blink",
    "blitFramebuffer",
    "blob",
    "block-size",
    "blockDirection",
    "blockSize",
    "blockedURI",
    "blue",
    "bluetooth",
    "blur",
    "body",
    "bodyUsed",
    "bold",
    "bookmarks",
    "booleanValue",
    "border",
    "border-block",
    "border-block-color",
    "border-block-end",
    "border-block-end-color",
    "border-block-end-style",
    "border-block-end-width",
    "border-block-start",
    "border-block-start-color",
    "border-block-start-style",
    "border-block-start-width",
    "border-block-style",
    "border-block-width",
    "border-bottom",
    "border-bottom-color",
    "border-bottom-left-radius",
    "border-bottom-right-radius",
    "border-bottom-style",
    "border-bottom-width",
    "border-collapse",
    "border-color",
    "border-end-end-radius",
    "border-end-start-radius",
    "border-image",
    "border-image-outset",
    "border-image-repeat",
    "border-image-slice",
    "border-image-source",
    "border-image-width",
    "border-inline",
    "border-inline-color",
    "border-inline-end",
    "border-inline-end-color",
    "border-inline-end-style",
    "border-inline-end-width",
    "border-inline-start",
    "border-inline-start-color",
    "border-inline-start-style",
    "border-inline-start-width",
    "border-inline-style",
    "border-inline-width",
    "border-left",
    "border-left-color",
    "border-left-style",
    "border-left-width",
    "border-radius",
    "border-right",
    "border-right-color",
    "border-right-style",
    "border-right-width",
    "border-spacing",
    "border-start-end-radius",
    "border-start-start-radius",
    "border-style",
    "border-top",
    "border-top-color",
    "border-top-left-radius",
    "border-top-right-radius",
    "border-top-style",
    "border-top-width",
    "border-width",
    "borderBlock",
    "borderBlockColor",
    "borderBlockEnd",
    "borderBlockEndColor",
    "borderBlockEndStyle",
    "borderBlockEndWidth",
    "borderBlockStart",
    "borderBlockStartColor",
    "borderBlockStartStyle",
    "borderBlockStartWidth",
    "borderBlockStyle",
    "borderBlockWidth",
    "borderBottom",
    "borderBottomColor",
    "borderBottomLeftRadius",
    "borderBottomRightRadius",
    "borderBottomStyle",
    "borderBottomWidth",
    "borderBoxSize",
    "borderCollapse",
    "borderColor",
    "borderColorDark",
    "borderColorLight",
    "borderEndEndRadius",
    "borderEndStartRadius",
    "borderImage",
    "borderImageOutset",
    "borderImageRepeat",
    "borderImageSlice",
    "borderImageSource",
    "borderImageWidth",
    "borderInline",
    "borderInlineColor",
    "borderInlineEnd",
    "borderInlineEndColor",
    "borderInlineEndStyle",
    "borderInlineEndWidth",
    "borderInlineStart",
    "borderInlineStartColor",
    "borderInlineStartStyle",
    "borderInlineStartWidth",
    "borderInlineStyle",
    "borderInlineWidth",
    "borderLeft",
    "borderLeftColor",
    "borderLeftStyle",
    "borderLeftWidth",
    "borderRadius",
    "borderRight",
    "borderRightColor",
    "borderRightStyle",
    "borderRightWidth",
    "borderSpacing",
    "borderStartEndRadius",
    "borderStartStartRadius",
    "borderStyle",
    "borderTop",
    "borderTopColor",
    "borderTopLeftRadius",
    "borderTopRightRadius",
    "borderTopStyle",
    "borderTopWidth",
    "borderWidth",
    "bottom",
    "bottomMargin",
    "bound",
    "boundElements",
    "boundingClientRect",
    "boundingHeight",
    "boundingLeft",
    "boundingTop",
    "boundingWidth",
    "bounds",
    "boundsGeometry",
    "box-decoration-break",
    "box-shadow",
    "box-sizing",
    "boxDecorationBreak",
    "boxShadow",
    "boxSizing",
    "brand",
    "brands",
    "break-after",
    "break-before",
    "break-inside",
    "breakAfter",
    "breakBefore",
    "breakInside",
    "broadcast",
    "browserLanguage",
    "btoa",
    "bubbles",
    "buffer",
    "bufferData",
    "bufferDepth",
    "bufferSize",
    "bufferSubData",
    "buffered",
    "bufferedAmount",
    "bufferedAmountLowThreshold",
    "buildID",
    "buildNumber",
    "button",
    "buttonID",
    "buttons",
    "byteLength",
    "byteOffset",
    "bytesWritten",
    "c",
    "cache",
    "caches",
    "call",
    "caller",
    "canBeFormatted",
    "canBeMounted",
    "canBeShared",
    "canHaveChildren",
    "canHaveHTML",
    "canInsertDTMF",
    "canMakePayment",
    "canPlayType",
    "canPresent",
    "canTrickleIceCandidates",
    "cancel",
    "cancelAndHoldAtTime",
    "cancelAnimationFrame",
    "cancelBubble",
    "cancelIdleCallback",
    "cancelScheduledValues",
    "cancelVideoFrameCallback",
    "cancelWatchAvailability",
    "cancelable",
    "candidate",
    "canonicalUUID",
    "canvas",
    "capabilities",
    "caption",
    "caption-side",
    "captionSide",
    "capture",
    "captureEvents",
    "captureStackTrace",
    "captureStream",
    "caret-color",
    "caretBidiLevel",
    "caretColor",
    "caretPositionFromPoint",
    "caretRangeFromPoint",
    "cast",
    "catch",
    "category",
    "cbrt",
    "cd",
    "ceil",
    "cellIndex",
    "cellPadding",
    "cellSpacing",
    "cells",
    "ch",
    "chOff",
    "chain",
    "challenge",
    "changeType",
    "changedTouches",
    "channel",
    "channelCount",
    "channelCountMode",
    "channelInterpretation",
    "char",
    "charAt",
    "charCode",
    "charCodeAt",
    "charIndex",
    "charLength",
    "characterData",
    "characterDataOldValue",
    "characterSet",
    "characteristic",
    "charging",
    "chargingTime",
    "charset",
    "check",
    "checkEnclosure",
    "checkFramebufferStatus",
    "checkIntersection",
    "checkValidity",
    "checked",
    "childElementCount",
    "childList",
    "childNodes",
    "children",
    "chrome",
    "ciphertext",
    "cite",
    "city",
    "claimInterface",
    "claimed",
    "classList",
    "className",
    "classid",
    "clear",
    "clearAppBadge",
    "clearAttributes",
    "clearBufferfi",
    "clearBufferfv",
    "clearBufferiv",
    "clearBufferuiv",
    "clearColor",
    "clearData",
    "clearDepth",
    "clearHalt",
    "clearImmediate",
    "clearInterval",
    "clearLiveSeekableRange",
    "clearMarks",
    "clearMaxGCPauseAccumulator",
    "clearMeasures",
    "clearParameters",
    "clearRect",
    "clearResourceTimings",
    "clearShadow",
    "clearStencil",
    "clearTimeout",
    "clearWatch",
    "click",
    "clickCount",
    "clientDataJSON",
    "clientHeight",
    "clientInformation",
    "clientLeft",
    "clientRect",
    "clientRects",
    "clientTop",
    "clientWaitSync",
    "clientWidth",
    "clientX",
    "clientY",
    "clip",
    "clip-path",
    "clip-rule",
    "clipBottom",
    "clipLeft",
    "clipPath",
    "clipPathUnits",
    "clipRight",
    "clipRule",
    "clipTop",
    "clipboard",
    "clipboardData",
    "clone",
    "cloneContents",
    "cloneNode",
    "cloneRange",
    "close",
    "closePath",
    "closed",
    "closest",
    "clz",
    "clz32",
    "cm",
    "cmp",
    "code",
    "codeBase",
    "codePointAt",
    "codeType",
    "colSpan",
    "collapse",
    "collapseToEnd",
    "collapseToStart",
    "collapsed",
    "collect",
    "colno",
    "color",
    "color-adjust",
    "color-interpolation",
    "color-interpolation-filters",
    "colorAdjust",
    "colorDepth",
    "colorInterpolation",
    "colorInterpolationFilters",
    "colorMask",
    "colorType",
    "cols",
    "column-count",
    "column-fill",
    "column-gap",
    "column-rule",
    "column-rule-color",
    "column-rule-style",
    "column-rule-width",
    "column-span",
    "column-width",
    "columnCount",
    "columnFill",
    "columnGap",
    "columnNumber",
    "columnRule",
    "columnRuleColor",
    "columnRuleStyle",
    "columnRuleWidth",
    "columnSpan",
    "columnWidth",
    "columns",
    "command",
    "commit",
    "commitPreferences",
    "commitStyles",
    "commonAncestorContainer",
    "compact",
    "compareBoundaryPoints",
    "compareDocumentPosition",
    "compareEndPoints",
    "compareExchange",
    "compareNode",
    "comparePoint",
    "compatMode",
    "compatible",
    "compile",
    "compileShader",
    "compileStreaming",
    "complete",
    "component",
    "componentFromPoint",
    "composed",
    "composedPath",
    "composite",
    "compositionEndOffset",
    "compositionStartOffset",
    "compressedTexImage2D",
    "compressedTexImage3D",
    "compressedTexSubImage2D",
    "compressedTexSubImage3D",
    "computedStyleMap",
    "concat",
    "conditionText",
    "coneInnerAngle",
    "coneOuterAngle",
    "coneOuterGain",
    "configuration",
    "configurationName",
    "configurationValue",
    "configurations",
    "confirm",
    "confirmComposition",
    "confirmSiteSpecificTrackingException",
    "confirmWebWideTrackingException",
    "connect",
    "connectEnd",
    "connectShark",
    "connectStart",
    "connected",
    "connection",
    "connectionList",
    "connectionSpeed",
    "connectionState",
    "connections",
    "console",
    "consolidate",
    "constraint",
    "constrictionActive",
    "construct",
    "constructor",
    "contactID",
    "contain",
    "containerId",
    "containerName",
    "containerSrc",
    "containerType",
    "contains",
    "containsNode",
    "content",
    "contentBoxSize",
    "contentDocument",
    "contentEditable",
    "contentHint",
    "contentOverflow",
    "contentRect",
    "contentScriptType",
    "contentStyleType",
    "contentType",
    "contentWindow",
    "context",
    "contextMenu",
    "contextmenu",
    "continue",
    "continuePrimaryKey",
    "continuous",
    "control",
    "controlTransferIn",
    "controlTransferOut",
    "controller",
    "controls",
    "controlsList",
    "convertPointFromNode",
    "convertQuadFromNode",
    "convertRectFromNode",
    "convertToBlob",
    "convertToSpecifiedUnits",
    "cookie",
    "cookieEnabled",
    "coords",
    "copyBufferSubData",
    "copyFromChannel",
    "copyTexImage2D",
    "copyTexSubImage2D",
    "copyTexSubImage3D",
    "copyToChannel",
    "copyWithin",
    "correspondingElement",
    "correspondingUseElement",
    "corruptedVideoFrames",
    "cos",
    "cosh",
    "count",
    "countReset",
    "counter-increment",
    "counter-reset",
    "counter-set",
    "counterIncrement",
    "counterReset",
    "counterSet",
    "country",
    "cpuClass",
    "cpuSleepAllowed",
    "create",
    "createAnalyser",
    "createAnswer",
    "createAttribute",
    "createAttributeNS",
    "createBiquadFilter",
    "createBuffer",
    "createBufferSource",
    "createCDATASection",
    "createCSSStyleSheet",
    "createCaption",
    "createChannelMerger",
    "createChannelSplitter",
    "createComment",
    "createConstantSource",
    "createContextualFragment",
    "createControlRange",
    "createConvolver",
    "createDTMFSender",
    "createDataChannel",
    "createDelay",
    "createDelayNode",
    "createDocument",
    "createDocumentFragment",
    "createDocumentType",
    "createDynamicsCompressor",
    "createElement",
    "createElementNS",
    "createEntityReference",
    "createEvent",
    "createEventObject",
    "createExpression",
    "createFramebuffer",
    "createFunction",
    "createGain",
    "createGainNode",
    "createHTML",
    "createHTMLDocument",
    "createIIRFilter",
    "createImageBitmap",
    "createImageData",
    "createIndex",
    "createJavaScriptNode",
    "createLinearGradient",
    "createMediaElementSource",
    "createMediaKeys",
    "createMediaStreamDestination",
    "createMediaStreamSource",
    "createMediaStreamTrackSource",
    "createMutableFile",
    "createNSResolver",
    "createNodeIterator",
    "createNotification",
    "createObjectStore",
    "createObjectURL",
    "createOffer",
    "createOscillator",
    "createPanner",
    "createPattern",
    "createPeriodicWave",
    "createPolicy",
    "createPopup",
    "createProcessingInstruction",
    "createProgram",
    "createQuery",
    "createRadialGradient",
    "createRange",
    "createRangeCollection",
    "createReader",
    "createRenderbuffer",
    "createSVGAngle",
    "createSVGLength",
    "createSVGMatrix",
    "createSVGNumber",
    "createSVGPathSegArcAbs",
    "createSVGPathSegArcRel",
    "createSVGPathSegClosePath",
    "createSVGPathSegCurvetoCubicAbs",
    "createSVGPathSegCurvetoCubicRel",
    "createSVGPathSegCurvetoCubicSmoothAbs",
    "createSVGPathSegCurvetoCubicSmoothRel",
    "createSVGPathSegCurvetoQuadraticAbs",
    "createSVGPathSegCurvetoQuadraticRel",
    "createSVGPathSegCurvetoQuadraticSmoothAbs",
    "createSVGPathSegCurvetoQuadraticSmoothRel",
    "createSVGPathSegLinetoAbs",
    "createSVGPathSegLinetoHorizontalAbs",
    "createSVGPathSegLinetoHorizontalRel",
    "createSVGPathSegLinetoRel",
    "createSVGPathSegLinetoVerticalAbs",
    "createSVGPathSegLinetoVerticalRel",
    "createSVGPathSegMovetoAbs",
    "createSVGPathSegMovetoRel",
    "createSVGPoint",
    "createSVGRect",
    "createSVGTransform",
    "createSVGTransformFromMatrix",
    "createSampler",
    "createScript",
    "createScriptProcessor",
    "createScriptURL",
    "createSession",
    "createShader",
    "createShadowRoot",
    "createStereoPanner",
    "createStyleSheet",
    "createTBody",
    "createTFoot",
    "createTHead",
    "createTextNode",
    "createTextRange",
    "createTexture",
    "createTouch",
    "createTouchList",
    "createTransformFeedback",
    "createTreeWalker",
    "createVertexArray",
    "createWaveShaper",
    "creationTime",
    "credentials",
    "crossOrigin",
    "crossOriginIsolated",
    "crypto",
    "csi",
    "csp",
    "cssFloat",
    "cssRules",
    "cssText",
    "cssValueType",
    "ctrlKey",
    "ctrlLeft",
    "cues",
    "cullFace",
    "currentDirection",
    "currentLocalDescription",
    "currentNode",
    "currentPage",
    "currentRect",
    "currentRemoteDescription",
    "currentScale",
    "currentScript",
    "currentSrc",
    "currentState",
    "currentStyle",
    "currentTarget",
    "currentTime",
    "currentTranslate",
    "currentView",
    "cursor",
    "curve",
    "customElements",
    "customError",
    "cx",
    "cy",
    "d",
    "data",
    "dataFld",
    "dataFormatAs",
    "dataLoss",
    "dataLossMessage",
    "dataPageSize",
    "dataSrc",
    "dataTransfer",
    "database",
    "databases",
    "dataset",
    "dateTime",
    "db",
    "debug",
    "debuggerEnabled",
    "declare",
    "decode",
    "decodeAudioData",
    "decodeURI",
    "decodeURIComponent",
    "decodedBodySize",
    "decoding",
    "decodingInfo",
    "decrypt",
    "default",
    "defaultCharset",
    "defaultChecked",
    "defaultMuted",
    "defaultPlaybackRate",
    "defaultPolicy",
    "defaultPrevented",
    "defaultRequest",
    "defaultSelected",
    "defaultStatus",
    "defaultURL",
    "defaultValue",
    "defaultView",
    "defaultstatus",
    "defer",
    "define",
    "defineMagicFunction",
    "defineMagicVariable",
    "defineProperties",
    "defineProperty",
    "deg",
    "delay",
    "delayTime",
    "delegatesFocus",
    "delete",
    "deleteBuffer",
    "deleteCaption",
    "deleteCell",
    "deleteContents",
    "deleteData",
    "deleteDatabase",
    "deleteFramebuffer",
    "deleteFromDocument",
    "deleteIndex",
    "deleteMedium",
    "deleteObjectStore",
    "deleteProgram",
    "deleteProperty",
    "deleteQuery",
    "deleteRenderbuffer",
    "deleteRow",
    "deleteRule",
    "deleteSampler",
    "deleteShader",
    "deleteSync",
    "deleteTFoot",
    "deleteTHead",
    "deleteTexture",
    "deleteTransformFeedback",
    "deleteVertexArray",
    "deliverChangeRecords",
    "delivery",
    "deliveryInfo",
    "deliveryStatus",
    "deliveryTimestamp",
    "delta",
    "deltaMode",
    "deltaX",
    "deltaY",
    "deltaZ",
    "dependentLocality",
    "depthFar",
    "depthFunc",
    "depthMask",
    "depthNear",
    "depthRange",
    "deref",
    "deriveBits",
    "deriveKey",
    "description",
    "deselectAll",
    "designMode",
    "desiredSize",
    "destination",
    "destinationURL",
    "detach",
    "detachEvent",
    "detachShader",
    "detail",
    "details",
    "detect",
    "detune",
    "device",
    "deviceClass",
    "deviceId",
    "deviceMemory",
    "devicePixelContentBoxSize",
    "devicePixelRatio",
    "deviceProtocol",
    "deviceSubclass",
    "deviceVersionMajor",
    "deviceVersionMinor",
    "deviceVersionSubminor",
    "deviceXDPI",
    "deviceYDPI",
    "didTimeout",
    "diffuseConstant",
    "digest",
    "dimensions",
    "dir",
    "dirName",
    "direction",
    "dirxml",
    "disable",
    "disablePictureInPicture",
    "disableRemotePlayback",
    "disableVertexAttribArray",
    "disabled",
    "dischargingTime",
    "disconnect",
    "disconnectShark",
    "dispatchEvent",
    "display",
    "displayId",
    "displayName",
    "disposition",
    "distanceModel",
    "div",
    "divisor",
    "djsapi",
    "djsproxy",
    "doImport",
    "doNotTrack",
    "doScroll",
    "doctype",
    "document",
    "documentElement",
    "documentMode",
    "documentURI",
    "dolphin",
    "dolphinGameCenter",
    "dolphininfo",
    "dolphinmeta",
    "domComplete",
    "domContentLoadedEventEnd",
    "domContentLoadedEventStart",
    "domInteractive",
    "domLoading",
    "domOverlayState",
    "domain",
    "domainLookupEnd",
    "domainLookupStart",
    "dominant-baseline",
    "dominantBaseline",
    "done",
    "dopplerFactor",
    "dotAll",
    "downDegrees",
    "downlink",
    "download",
    "downloadTotal",
    "downloaded",
    "dpcm",
    "dpi",
    "dppx",
    "dragDrop",
    "draggable",
    "drawArrays",
    "drawArraysInstanced",
    "drawArraysInstancedANGLE",
    "drawBuffers",
    "drawCustomFocusRing",
    "drawElements",
    "drawElementsInstanced",
    "drawElementsInstancedANGLE",
    "drawFocusIfNeeded",
    "drawImage",
    "drawImageFromRect",
    "drawRangeElements",
    "drawSystemFocusRing",
    "drawingBufferHeight",
    "drawingBufferWidth",
    "dropEffect",
    "droppedVideoFrames",
    "dropzone",
    "dtmf",
    "dump",
    "dumpProfile",
    "duplicate",
    "durability",
    "duration",
    "dvname",
    "dvnum",
    "dx",
    "dy",
    "dynsrc",
    "e",
    "edgeMode",
    "effect",
    "effectAllowed",
    "effectiveDirective",
    "effectiveType",
    "elapsedTime",
    "element",
    "elementFromPoint",
    "elementTiming",
    "elements",
    "elementsFromPoint",
    "elevation",
    "ellipse",
    "em",
    "email",
    "embeds",
    "emma",
    "empty",
    "empty-cells",
    "emptyCells",
    "emptyHTML",
    "emptyScript",
    "emulatedPosition",
    "enable",
    "enableBackground",
    "enableDelegations",
    "enableStyleSheetsForSet",
    "enableVertexAttribArray",
    "enabled",
    "enabledPlugin",
    "encode",
    "encodeInto",
    "encodeURI",
    "encodeURIComponent",
    "encodedBodySize",
    "encoding",
    "encodingInfo",
    "encrypt",
    "enctype",
    "end",
    "endContainer",
    "endElement",
    "endElementAt",
    "endOfStream",
    "endOffset",
    "endQuery",
    "endTime",
    "endTransformFeedback",
    "ended",
    "endpoint",
    "endpointNumber",
    "endpoints",
    "endsWith",
    "enterKeyHint",
    "entities",
    "entries",
    "entryType",
    "enumerate",
    "enumerateDevices",
    "enumerateEditable",
    "environmentBlendMode",
    "equals",
    "error",
    "errorCode",
    "errorDetail",
    "errorText",
    "escape",
    "estimate",
    "eval",
    "evaluate",
    "event",
    "eventPhase",
    "every",
    "ex",
    "exception",
    "exchange",
    "exec",
    "execCommand",
    "execCommandShowHelp",
    "execScript",
    "exitFullscreen",
    "exitPictureInPicture",
    "exitPointerLock",
    "exitPresent",
    "exp",
    "expand",
    "expandEntityReferences",
    "expando",
    "expansion",
    "expiration",
    "expirationTime",
    "expires",
    "expiryDate",
    "explicitOriginalTarget",
    "expm1",
    "exponent",
    "exponentialRampToValueAtTime",
    "exportKey",
    "exports",
    "extend",
    "extensions",
    "extentNode",
    "extentOffset",
    "external",
    "externalResourcesRequired",
    "extractContents",
    "extractable",
    "eye",
    "f",
    "face",
    "factoryReset",
    "failureReason",
    "fallback",
    "family",
    "familyName",
    "farthestViewportElement",
    "fastSeek",
    "fatal",
    "featureId",
    "featurePolicy",
    "featureSettings",
    "features",
    "fenceSync",
    "fetch",
    "fetchStart",
    "fftSize",
    "fgColor",
    "fieldOfView",
    "file",
    "fileCreatedDate",
    "fileHandle",
    "fileModifiedDate",
    "fileName",
    "fileSize",
    "fileUpdatedDate",
    "filename",
    "files",
    "filesystem",
    "fill",
    "fill-opacity",
    "fill-rule",
    "fillLightMode",
    "fillOpacity",
    "fillRect",
    "fillRule",
    "fillStyle",
    "fillText",
    "filter",
    "filterResX",
    "filterResY",
    "filterUnits",
    "filters",
    "finally",
    "find",
    "findIndex",
    "findRule",
    "findText",
    "finish",
    "finished",
    "fireEvent",
    "firesTouchEvents",
    "firstChild",
    "firstElementChild",
    "firstPage",
    "fixed",
    "flags",
    "flat",
    "flatMap",
    "flex",
    "flex-basis",
    "flex-direction",
    "flex-flow",
    "flex-grow",
    "flex-shrink",
    "flex-wrap",
    "flexBasis",
    "flexDirection",
    "flexFlow",
    "flexGrow",
    "flexShrink",
    "flexWrap",
    "flipX",
    "flipY",
    "float",
    "float32",
    "float64",
    "flood-color",
    "flood-opacity",
    "floodColor",
    "floodOpacity",
    "floor",
    "flush",
    "focus",
    "focusNode",
    "focusOffset",
    "font",
    "font-family",
    "font-feature-settings",
    "font-kerning",
    "font-language-override",
    "font-optical-sizing",
    "font-size",
    "font-size-adjust",
    "font-stretch",
    "font-style",
    "font-synthesis",
    "font-variant",
    "font-variant-alternates",
    "font-variant-caps",
    "font-variant-east-asian",
    "font-variant-ligatures",
    "font-variant-numeric",
    "font-variant-position",
    "font-variation-settings",
    "font-weight",
    "fontFamily",
    "fontFeatureSettings",
    "fontKerning",
    "fontLanguageOverride",
    "fontOpticalSizing",
    "fontSize",
    "fontSizeAdjust",
    "fontSmoothingEnabled",
    "fontStretch",
    "fontStyle",
    "fontSynthesis",
    "fontVariant",
    "fontVariantAlternates",
    "fontVariantCaps",
    "fontVariantEastAsian",
    "fontVariantLigatures",
    "fontVariantNumeric",
    "fontVariantPosition",
    "fontVariationSettings",
    "fontWeight",
    "fontcolor",
    "fontfaces",
    "fonts",
    "fontsize",
    "for",
    "forEach",
    "force",
    "forceRedraw",
    "form",
    "formAction",
    "formData",
    "formEnctype",
    "formMethod",
    "formNoValidate",
    "formTarget",
    "format",
    "formatToParts",
    "forms",
    "forward",
    "forwardX",
    "forwardY",
    "forwardZ",
    "foundation",
    "fr",
    "fragmentDirective",
    "frame",
    "frameBorder",
    "frameElement",
    "frameSpacing",
    "framebuffer",
    "framebufferHeight",
    "framebufferRenderbuffer",
    "framebufferTexture2D",
    "framebufferTextureLayer",
    "framebufferWidth",
    "frames",
    "freeSpace",
    "freeze",
    "frequency",
    "frequencyBinCount",
    "from",
    "fromCharCode",
    "fromCodePoint",
    "fromElement",
    "fromEntries",
    "fromFloat32Array",
    "fromFloat64Array",
    "fromMatrix",
    "fromPoint",
    "fromQuad",
    "fromRect",
    "frontFace",
    "fround",
    "fullPath",
    "fullScreen",
    "fullVersionList",
    "fullscreen",
    "fullscreenElement",
    "fullscreenEnabled",
    "fx",
    "fy",
    "gain",
    "gamepad",
    "gamma",
    "gap",
    "gatheringState",
    "gatt",
    "genderIdentity",
    "generateCertificate",
    "generateKey",
    "generateMipmap",
    "generateRequest",
    "geolocation",
    "gestureObject",
    "get",
    "getActiveAttrib",
    "getActiveUniform",
    "getActiveUniformBlockName",
    "getActiveUniformBlockParameter",
    "getActiveUniforms",
    "getAdjacentText",
    "getAll",
    "getAllKeys",
    "getAllResponseHeaders",
    "getAllowlistForFeature",
    "getAnimations",
    "getAsFile",
    "getAsString",
    "getAttachedShaders",
    "getAttribLocation",
    "getAttribute",
    "getAttributeNS",
    "getAttributeNames",
    "getAttributeNode",
    "getAttributeNodeNS",
    "getAttributeType",
    "getAudioTracks",
    "getAvailability",
    "getBBox",
    "getBattery",
    "getBigInt64",
    "getBigUint64",
    "getBlob",
    "getBookmark",
    "getBoundingClientRect",
    "getBounds",
    "getBoxQuads",
    "getBufferParameter",
    "getBufferSubData",
    "getByteFrequencyData",
    "getByteTimeDomainData",
    "getCSSCanvasContext",
    "getCTM",
    "getCandidateWindowClientRect",
    "getCanonicalLocales",
    "getCapabilities",
    "getChannelData",
    "getCharNumAtPosition",
    "getCharacteristic",
    "getCharacteristics",
    "getClientExtensionResults",
    "getClientRect",
    "getClientRects",
    "getCoalescedEvents",
    "getCompositionAlternatives",
    "getComputedStyle",
    "getComputedTextLength",
    "getComputedTiming",
    "getConfiguration",
    "getConstraints",
    "getContext",
    "getContextAttributes",
    "getContributingSources",
    "getCounterValue",
    "getCueAsHTML",
    "getCueById",
    "getCurrentPosition",
    "getCurrentTime",
    "getData",
    "getDatabaseNames",
    "getDate",
    "getDay",
    "getDefaultComputedStyle",
    "getDescriptor",
    "getDescriptors",
    "getDestinationInsertionPoints",
    "getDevices",
    "getDirectory",
    "getDisplayMedia",
    "getDistributedNodes",
    "getEditable",
    "getElementById",
    "getElementsByClassName",
    "getElementsByName",
    "getElementsByTagName",
    "getElementsByTagNameNS",
    "getEnclosureList",
    "getEndPositionOfChar",
    "getEntries",
    "getEntriesByName",
    "getEntriesByType",
    "getError",
    "getExtension",
    "getExtentOfChar",
    "getEyeParameters",
    "getFeature",
    "getFile",
    "getFiles",
    "getFilesAndDirectories",
    "getFingerprints",
    "getFloat32",
    "getFloat64",
    "getFloatFrequencyData",
    "getFloatTimeDomainData",
    "getFloatValue",
    "getFragDataLocation",
    "getFrameData",
    "getFramebufferAttachmentParameter",
    "getFrequencyResponse",
    "getFullYear",
    "getGamepads",
    "getHighEntropyValues",
    "getHitTestResults",
    "getHitTestResultsForTransientInput",
    "getHours",
    "getIdentityAssertion",
    "getIds",
    "getImageData",
    "getIndexedParameter",
    "getInstalledRelatedApps",
    "getInt16",
    "getInt32",
    "getInt8",
    "getInternalformatParameter",
    "getIntersectionList",
    "getItem",
    "getItems",
    "getKey",
    "getKeyframes",
    "getLayers",
    "getLayoutMap",
    "getLineDash",
    "getLocalCandidates",
    "getLocalParameters",
    "getLocalStreams",
    "getMarks",
    "getMatchedCSSRules",
    "getMaxGCPauseSinceClear",
    "getMeasures",
    "getMetadata",
    "getMilliseconds",
    "getMinutes",
    "getModifierState",
    "getMonth",
    "getNamedItem",
    "getNamedItemNS",
    "getNativeFramebufferScaleFactor",
    "getNotifications",
    "getNotifier",
    "getNumberOfChars",
    "getOffsetReferenceSpace",
    "getOutputTimestamp",
    "getOverrideHistoryNavigationMode",
    "getOverrideStyle",
    "getOwnPropertyDescriptor",
    "getOwnPropertyDescriptors",
    "getOwnPropertyNames",
    "getOwnPropertySymbols",
    "getParameter",
    "getParameters",
    "getParent",
    "getPathSegAtLength",
    "getPhotoCapabilities",
    "getPhotoSettings",
    "getPointAtLength",
    "getPose",
    "getPredictedEvents",
    "getPreference",
    "getPreferenceDefault",
    "getPresentationAttribute",
    "getPreventDefault",
    "getPrimaryService",
    "getPrimaryServices",
    "getProgramInfoLog",
    "getProgramParameter",
    "getPropertyCSSValue",
    "getPropertyPriority",
    "getPropertyShorthand",
    "getPropertyType",
    "getPropertyValue",
    "getPrototypeOf",
    "getQuery",
    "getQueryParameter",
    "getRGBColorValue",
    "getRandomValues",
    "getRangeAt",
    "getReader",
    "getReceivers",
    "getRectValue",
    "getRegistration",
    "getRegistrations",
    "getRemoteCandidates",
    "getRemoteCertificates",
    "getRemoteParameters",
    "getRemoteStreams",
    "getRenderbufferParameter",
    "getResponseHeader",
    "getRoot",
    "getRootNode",
    "getRotationOfChar",
    "getSVGDocument",
    "getSamplerParameter",
    "getScreenCTM",
    "getSeconds",
    "getSelectedCandidatePair",
    "getSelection",
    "getSenders",
    "getService",
    "getSettings",
    "getShaderInfoLog",
    "getShaderParameter",
    "getShaderPrecisionFormat",
    "getShaderSource",
    "getSimpleDuration",
    "getSiteIcons",
    "getSources",
    "getSpeculativeParserUrls",
    "getStartPositionOfChar",
    "getStartTime",
    "getState",
    "getStats",
    "getStatusForPolicy",
    "getStorageUpdates",
    "getStreamById",
    "getStringValue",
    "getSubStringLength",
    "getSubscription",
    "getSupportedConstraints",
    "getSupportedExtensions",
    "getSupportedFormats",
    "getSyncParameter",
    "getSynchronizationSources",
    "getTags",
    "getTargetRanges",
    "getTexParameter",
    "getTime",
    "getTimezoneOffset",
    "getTiming",
    "getTotalLength",
    "getTrackById",
    "getTracks",
    "getTransceivers",
    "getTransform",
    "getTransformFeedbackVarying",
    "getTransformToElement",
    "getTransports",
    "getType",
    "getTypeMapping",
    "getUTCDate",
    "getUTCDay",
    "getUTCFullYear",
    "getUTCHours",
    "getUTCMilliseconds",
    "getUTCMinutes",
    "getUTCMonth",
    "getUTCSeconds",
    "getUint16",
    "getUint32",
    "getUint8",
    "getUniform",
    "getUniformBlockIndex",
    "getUniformIndices",
    "getUniformLocation",
    "getUserMedia",
    "getVRDisplays",
    "getValues",
    "getVarDate",
    "getVariableValue",
    "getVertexAttrib",
    "getVertexAttribOffset",
    "getVideoPlaybackQuality",
    "getVideoTracks",
    "getViewerPose",
    "getViewport",
    "getVoices",
    "getWakeLockState",
    "getWriter",
    "getYear",
    "givenName",
    "global",
    "globalAlpha",
    "globalCompositeOperation",
    "globalThis",
    "glyphOrientationHorizontal",
    "glyphOrientationVertical",
    "glyphRef",
    "go",
    "grabFrame",
    "grad",
    "gradientTransform",
    "gradientUnits",
    "grammars",
    "green",
    "grid",
    "grid-area",
    "grid-auto-columns",
    "grid-auto-flow",
    "grid-auto-rows",
    "grid-column",
    "grid-column-end",
    "grid-column-gap",
    "grid-column-start",
    "grid-gap",
    "grid-row",
    "grid-row-end",
    "grid-row-gap",
    "grid-row-start",
    "grid-template",
    "grid-template-areas",
    "grid-template-columns",
    "grid-template-rows",
    "gridArea",
    "gridAutoColumns",
    "gridAutoFlow",
    "gridAutoRows",
    "gridColumn",
    "gridColumnEnd",
    "gridColumnGap",
    "gridColumnStart",
    "gridGap",
    "gridRow",
    "gridRowEnd",
    "gridRowGap",
    "gridRowStart",
    "gridTemplate",
    "gridTemplateAreas",
    "gridTemplateColumns",
    "gridTemplateRows",
    "gripSpace",
    "group",
    "groupCollapsed",
    "groupEnd",
    "groupId",
    "hadRecentInput",
    "hand",
    "handedness",
    "hapticActuators",
    "hardwareConcurrency",
    "has",
    "hasAttribute",
    "hasAttributeNS",
    "hasAttributes",
    "hasBeenActive",
    "hasChildNodes",
    "hasComposition",
    "hasEnrolledInstrument",
    "hasExtension",
    "hasExternalDisplay",
    "hasFeature",
    "hasFocus",
    "hasInstance",
    "hasLayout",
    "hasOrientation",
    "hasOwnProperty",
    "hasPointerCapture",
    "hasPosition",
    "hasReading",
    "hasStorageAccess",
    "hash",
    "head",
    "headers",
    "heading",
    "height",
    "hidden",
    "hide",
    "hideFocus",
    "high",
    "highWaterMark",
    "hint",
    "history",
    "honorificPrefix",
    "honorificSuffix",
    "horizontalOverflow",
    "host",
    "hostCandidate",
    "hostname",
    "href",
    "hrefTranslate",
    "hreflang",
    "hspace",
    "html5TagCheckInerface",
    "htmlFor",
    "htmlText",
    "httpEquiv",
    "httpRequestStatusCode",
    "hwTimestamp",
    "hyphens",
    "hypot",
    "iccId",
    "iceConnectionState",
    "iceGatheringState",
    "iceTransport",
    "icon",
    "iconURL",
    "id",
    "identifier",
    "identity",
    "idpLoginUrl",
    "ignoreBOM",
    "ignoreCase",
    "ignoreDepthValues",
    "image-orientation",
    "image-rendering",
    "imageHeight",
    "imageOrientation",
    "imageRendering",
    "imageSizes",
    "imageSmoothingEnabled",
    "imageSmoothingQuality",
    "imageSrcset",
    "imageWidth",
    "images",
    "ime-mode",
    "imeMode",
    "implementation",
    "importKey",
    "importNode",
    "importStylesheet",
    "imports",
    "impp",
    "imul",
    "in",
    "in1",
    "in2",
    "inBandMetadataTrackDispatchType",
    "inRange",
    "includes",
    "incremental",
    "indeterminate",
    "index",
    "indexNames",
    "indexOf",
    "indexedDB",
    "indicate",
    "inertiaDestinationX",
    "inertiaDestinationY",
    "info",
    "init",
    "initAnimationEvent",
    "initBeforeLoadEvent",
    "initClipboardEvent",
    "initCloseEvent",
    "initCommandEvent",
    "initCompositionEvent",
    "initCustomEvent",
    "initData",
    "initDataType",
    "initDeviceMotionEvent",
    "initDeviceOrientationEvent",
    "initDragEvent",
    "initErrorEvent",
    "initEvent",
    "initFocusEvent",
    "initGestureEvent",
    "initHashChangeEvent",
    "initKeyEvent",
    "initKeyboardEvent",
    "initMSManipulationEvent",
    "initMessageEvent",
    "initMouseEvent",
    "initMouseScrollEvent",
    "initMouseWheelEvent",
    "initMutationEvent",
    "initNSMouseEvent",
    "initOverflowEvent",
    "initPageEvent",
    "initPageTransitionEvent",
    "initPointerEvent",
    "initPopStateEvent",
    "initProgressEvent",
    "initScrollAreaEvent",
    "initSimpleGestureEvent",
    "initStorageEvent",
    "initTextEvent",
    "initTimeEvent",
    "initTouchEvent",
    "initTransitionEvent",
    "initUIEvent",
    "initWebKitAnimationEvent",
    "initWebKitTransitionEvent",
    "initWebKitWheelEvent",
    "initWheelEvent",
    "initialTime",
    "initialize",
    "initiatorType",
    "inline-size",
    "inlineSize",
    "inlineVerticalFieldOfView",
    "inner",
    "innerHTML",
    "innerHeight",
    "innerText",
    "innerWidth",
    "input",
    "inputBuffer",
    "inputEncoding",
    "inputMethod",
    "inputMode",
    "inputSource",
    "inputSources",
    "inputType",
    "inputs",
    "insertAdjacentElement",
    "insertAdjacentHTML",
    "insertAdjacentText",
    "insertBefore",
    "insertCell",
    "insertDTMF",
    "insertData",
    "insertItemBefore",
    "insertNode",
    "insertRow",
    "insertRule",
    "inset",
    "inset-block",
    "inset-block-end",
    "inset-block-start",
    "inset-inline",
    "inset-inline-end",
    "inset-inline-start",
    "insetBlock",
    "insetBlockEnd",
    "insetBlockStart",
    "insetInline",
    "insetInlineEnd",
    "insetInlineStart",
    "installing",
    "instanceRoot",
    "instantiate",
    "instantiateStreaming",
    "instruments",
    "int16",
    "int32",
    "int8",
    "integrity",
    "interactionMode",
    "intercept",
    "interfaceClass",
    "interfaceName",
    "interfaceNumber",
    "interfaceProtocol",
    "interfaceSubclass",
    "interfaces",
    "interimResults",
    "internalSubset",
    "interpretation",
    "intersectionRatio",
    "intersectionRect",
    "intersectsNode",
    "interval",
    "invalidIteratorState",
    "invalidateFramebuffer",
    "invalidateSubFramebuffer",
    "inverse",
    "invertSelf",
    "is",
    "is2D",
    "isActive",
    "isAlternate",
    "isArray",
    "isBingCurrentSearchDefault",
    "isBuffer",
    "isCandidateWindowVisible",
    "isChar",
    "isCollapsed",
    "isComposing",
    "isConcatSpreadable",
    "isConnected",
    "isContentEditable",
    "isContentHandlerRegistered",
    "isContextLost",
    "isDefaultNamespace",
    "isDirectory",
    "isDisabled",
    "isEnabled",
    "isEqual",
    "isEqualNode",
    "isExtensible",
    "isExternalCTAP2SecurityKeySupported",
    "isFile",
    "isFinite",
    "isFramebuffer",
    "isFrozen",
    "isGenerator",
    "isHTML",
    "isHistoryNavigation",
    "isId",
    "isIdentity",
    "isInjected",
    "isInteger",
    "isIntersecting",
    "isLockFree",
    "isMap",
    "isMultiLine",
    "isNaN",
    "isOpen",
    "isPointInFill",
    "isPointInPath",
    "isPointInRange",
    "isPointInStroke",
    "isPrefAlternate",
    "isPresenting",
    "isPrimary",
    "isProgram",
    "isPropertyImplicit",
    "isProtocolHandlerRegistered",
    "isPrototypeOf",
    "isQuery",
    "isRenderbuffer",
    "isSafeInteger",
    "isSameNode",
    "isSampler",
    "isScript",
    "isScriptURL",
    "isSealed",
    "isSecureContext",
    "isSessionSupported",
    "isShader",
    "isSupported",
    "isSync",
    "isTextEdit",
    "isTexture",
    "isTransformFeedback",
    "isTrusted",
    "isTypeSupported",
    "isUserVerifyingPlatformAuthenticatorAvailable",
    "isVertexArray",
    "isView",
    "isVisible",
    "isochronousTransferIn",
    "isochronousTransferOut",
    "isolation",
    "italics",
    "item",
    "itemId",
    "itemProp",
    "itemRef",
    "itemScope",
    "itemType",
    "itemValue",
    "items",
    "iterateNext",
    "iterationComposite",
    "iterator",
    "javaEnabled",
    "jobTitle",
    "join",
    "json",
    "justify-content",
    "justify-items",
    "justify-self",
    "justifyContent",
    "justifyItems",
    "justifySelf",
    "k1",
    "k2",
    "k3",
    "k4",
    "kHz",
    "keepalive",
    "kernelMatrix",
    "kernelUnitLengthX",
    "kernelUnitLengthY",
    "kerning",
    "key",
    "keyCode",
    "keyFor",
    "keyIdentifier",
    "keyLightEnabled",
    "keyLocation",
    "keyPath",
    "keyStatuses",
    "keySystem",
    "keyText",
    "keyUsage",
    "keyboard",
    "keys",
    "keytype",
    "kind",
    "knee",
    "label",
    "labels",
    "lang",
    "language",
    "languages",
    "largeArcFlag",
    "lastChild",
    "lastElementChild",
    "lastEventId",
    "lastIndex",
    "lastIndexOf",
    "lastInputTime",
    "lastMatch",
    "lastMessageSubject",
    "lastMessageType",
    "lastModified",
    "lastModifiedDate",
    "lastPage",
    "lastParen",
    "lastState",
    "lastStyleSheetSet",
    "latitude",
    "layerX",
    "layerY",
    "layoutFlow",
    "layoutGrid",
    "layoutGridChar",
    "layoutGridLine",
    "layoutGridMode",
    "layoutGridType",
    "lbound",
    "left",
    "leftContext",
    "leftDegrees",
    "leftMargin",
    "leftProjectionMatrix",
    "leftViewMatrix",
    "length",
    "lengthAdjust",
    "lengthComputable",
    "letter-spacing",
    "letterSpacing",
    "level",
    "lighting-color",
    "lightingColor",
    "limitingConeAngle",
    "line",
    "line-break",
    "line-height",
    "lineAlign",
    "lineBreak",
    "lineCap",
    "lineDashOffset",
    "lineHeight",
    "lineJoin",
    "lineNumber",
    "lineTo",
    "lineWidth",
    "linearAcceleration",
    "linearRampToValueAtTime",
    "linearVelocity",
    "lineno",
    "lines",
    "link",
    "linkColor",
    "linkProgram",
    "links",
    "list",
    "list-style",
    "list-style-image",
    "list-style-position",
    "list-style-type",
    "listStyle",
    "listStyleImage",
    "listStylePosition",
    "listStyleType",
    "listener",
    "load",
    "loadEventEnd",
    "loadEventStart",
    "loadTime",
    "loadTimes",
    "loaded",
    "loading",
    "localDescription",
    "localName",
    "localService",
    "localStorage",
    "locale",
    "localeCompare",
    "location",
    "locationbar",
    "lock",
    "locked",
    "lockedFile",
    "locks",
    "log",
    "log10",
    "log1p",
    "log2",
    "logicalXDPI",
    "logicalYDPI",
    "longDesc",
    "longitude",
    "lookupNamespaceURI",
    "lookupPrefix",
    "loop",
    "loopEnd",
    "loopStart",
    "looping",
    "low",
    "lower",
    "lowerBound",
    "lowerOpen",
    "lowsrc",
    "m11",
    "m12",
    "m13",
    "m14",
    "m21",
    "m22",
    "m23",
    "m24",
    "m31",
    "m32",
    "m33",
    "m34",
    "m41",
    "m42",
    "m43",
    "m44",
    "makeXRCompatible",
    "manifest",
    "manufacturer",
    "manufacturerName",
    "map",
    "mapping",
    "margin",
    "margin-block",
    "margin-block-end",
    "margin-block-start",
    "margin-bottom",
    "margin-inline",
    "margin-inline-end",
    "margin-inline-start",
    "margin-left",
    "margin-right",
    "margin-top",
    "marginBlock",
    "marginBlockEnd",
    "marginBlockStart",
    "marginBottom",
    "marginHeight",
    "marginInline",
    "marginInlineEnd",
    "marginInlineStart",
    "marginLeft",
    "marginRight",
    "marginTop",
    "marginWidth",
    "mark",
    "marker",
    "marker-end",
    "marker-mid",
    "marker-offset",
    "marker-start",
    "markerEnd",
    "markerHeight",
    "markerMid",
    "markerOffset",
    "markerStart",
    "markerUnits",
    "markerWidth",
    "marks",
    "mask",
    "mask-clip",
    "mask-composite",
    "mask-image",
    "mask-mode",
    "mask-origin",
    "mask-position",
    "mask-position-x",
    "mask-position-y",
    "mask-repeat",
    "mask-size",
    "mask-type",
    "maskClip",
    "maskComposite",
    "maskContentUnits",
    "maskImage",
    "maskMode",
    "maskOrigin",
    "maskPosition",
    "maskPositionX",
    "maskPositionY",
    "maskRepeat",
    "maskSize",
    "maskType",
    "maskUnits",
    "match",
    "matchAll",
    "matchMedia",
    "matchMedium",
    "matches",
    "matrix",
    "matrixTransform",
    "max",
    "max-block-size",
    "max-height",
    "max-inline-size",
    "max-width",
    "maxActions",
    "maxAlternatives",
    "maxBlockSize",
    "maxChannelCount",
    "maxChannels",
    "maxConnectionsPerServer",
    "maxDecibels",
    "maxDistance",
    "maxHeight",
    "maxInlineSize",
    "maxLayers",
    "maxLength",
    "maxMessageSize",
    "maxPacketLifeTime",
    "maxRetransmits",
    "maxTouchPoints",
    "maxValue",
    "maxWidth",
    "measure",
    "measureText",
    "media",
    "mediaCapabilities",
    "mediaDevices",
    "mediaElement",
    "mediaGroup",
    "mediaKeys",
    "mediaSession",
    "mediaStream",
    "mediaText",
    "meetOrSlice",
    "memory",
    "menubar",
    "mergeAttributes",
    "message",
    "messageClass",
    "messageHandlers",
    "messageType",
    "metaKey",
    "metadata",
    "method",
    "methodDetails",
    "methodName",
    "mid",
    "mimeType",
    "mimeTypes",
    "min",
    "min-block-size",
    "min-height",
    "min-inline-size",
    "min-width",
    "minBlockSize",
    "minDecibels",
    "minHeight",
    "minInlineSize",
    "minLength",
    "minValue",
    "minWidth",
    "miterLimit",
    "mix-blend-mode",
    "mixBlendMode",
    "mm",
    "mobile",
    "mode",
    "model",
    "modify",
    "mount",
    "move",
    "moveBy",
    "moveEnd",
    "moveFirst",
    "moveFocusDown",
    "moveFocusLeft",
    "moveFocusRight",
    "moveFocusUp",
    "moveNext",
    "moveRow",
    "moveStart",
    "moveTo",
    "moveToBookmark",
    "moveToElementText",
    "moveToPoint",
    "movementX",
    "movementY",
    "mozAdd",
    "mozAnimationStartTime",
    "mozAnon",
    "mozApps",
    "mozAudioCaptured",
    "mozAudioChannelType",
    "mozAutoplayEnabled",
    "mozCancelAnimationFrame",
    "mozCancelFullScreen",
    "mozCancelRequestAnimationFrame",
    "mozCaptureStream",
    "mozCaptureStreamUntilEnded",
    "mozClearDataAt",
    "mozContact",
    "mozContacts",
    "mozCreateFileHandle",
    "mozCurrentTransform",
    "mozCurrentTransformInverse",
    "mozCursor",
    "mozDash",
    "mozDashOffset",
    "mozDecodedFrames",
    "mozExitPointerLock",
    "mozFillRule",
    "mozFragmentEnd",
    "mozFrameDelay",
    "mozFullScreen",
    "mozFullScreenElement",
    "mozFullScreenEnabled",
    "mozGetAll",
    "mozGetAllKeys",
    "mozGetAsFile",
    "mozGetDataAt",
    "mozGetMetadata",
    "mozGetUserMedia",
    "mozHasAudio",
    "mozHasItem",
    "mozHidden",
    "mozImageSmoothingEnabled",
    "mozIndexedDB",
    "mozInnerScreenX",
    "mozInnerScreenY",
    "mozInputSource",
    "mozIsTextField",
    "mozItem",
    "mozItemCount",
    "mozItems",
    "mozLength",
    "mozLockOrientation",
    "mozMatchesSelector",
    "mozMovementX",
    "mozMovementY",
    "mozOpaque",
    "mozOrientation",
    "mozPaintCount",
    "mozPaintedFrames",
    "mozParsedFrames",
    "mozPay",
    "mozPointerLockElement",
    "mozPresentedFrames",
    "mozPreservesPitch",
    "mozPressure",
    "mozPrintCallback",
    "mozRTCIceCandidate",
    "mozRTCPeerConnection",
    "mozRTCSessionDescription",
    "mozRemove",
    "mozRequestAnimationFrame",
    "mozRequestFullScreen",
    "mozRequestPointerLock",
    "mozSetDataAt",
    "mozSetImageElement",
    "mozSourceNode",
    "mozSrcObject",
    "mozSystem",
    "mozTCPSocket",
    "mozTextStyle",
    "mozTypesAt",
    "mozUnlockOrientation",
    "mozUserCancelled",
    "mozVisibilityState",
    "ms",
    "msAnimation",
    "msAnimationDelay",
    "msAnimationDirection",
    "msAnimationDuration",
    "msAnimationFillMode",
    "msAnimationIterationCount",
    "msAnimationName",
    "msAnimationPlayState",
    "msAnimationStartTime",
    "msAnimationTimingFunction",
    "msBackfaceVisibility",
    "msBlockProgression",
    "msCSSOMElementFloatMetrics",
    "msCaching",
    "msCachingEnabled",
    "msCancelRequestAnimationFrame",
    "msCapsLockWarningOff",
    "msClearImmediate",
    "msClose",
    "msContentZoomChaining",
    "msContentZoomFactor",
    "msContentZoomLimit",
    "msContentZoomLimitMax",
    "msContentZoomLimitMin",
    "msContentZoomSnap",
    "msContentZoomSnapPoints",
    "msContentZoomSnapType",
    "msContentZooming",
    "msConvertURL",
    "msCrypto",
    "msDoNotTrack",
    "msElementsFromPoint",
    "msElementsFromRect",
    "msExitFullscreen",
    "msExtendedCode",
    "msFillRule",
    "msFirstPaint",
    "msFlex",
    "msFlexAlign",
    "msFlexDirection",
    "msFlexFlow",
    "msFlexItemAlign",
    "msFlexLinePack",
    "msFlexNegative",
    "msFlexOrder",
    "msFlexPack",
    "msFlexPositive",
    "msFlexPreferredSize",
    "msFlexWrap",
    "msFlowFrom",
    "msFlowInto",
    "msFontFeatureSettings",
    "msFullscreenElement",
    "msFullscreenEnabled",
    "msGetInputContext",
    "msGetRegionContent",
    "msGetUntransformedBounds",
    "msGraphicsTrustStatus",
    "msGridColumn",
    "msGridColumnAlign",
    "msGridColumnSpan",
    "msGridColumns",
    "msGridRow",
    "msGridRowAlign",
    "msGridRowSpan",
    "msGridRows",
    "msHidden",
    "msHighContrastAdjust",
    "msHyphenateLimitChars",
    "msHyphenateLimitLines",
    "msHyphenateLimitZone",
    "msHyphens",
    "msImageSmoothingEnabled",
    "msImeAlign",
    "msIndexedDB",
    "msInterpolationMode",
    "msIsStaticHTML",
    "msKeySystem",
    "msKeys",
    "msLaunchUri",
    "msLockOrientation",
    "msManipulationViewsEnabled",
    "msMatchMedia",
    "msMatchesSelector",
    "msMaxTouchPoints",
    "msOrientation",
    "msOverflowStyle",
    "msPerspective",
    "msPerspectiveOrigin",
    "msPlayToDisabled",
    "msPlayToPreferredSourceUri",
    "msPlayToPrimary",
    "msPointerEnabled",
    "msRegionOverflow",
    "msReleasePointerCapture",
    "msRequestAnimationFrame",
    "msRequestFullscreen",
    "msSaveBlob",
    "msSaveOrOpenBlob",
    "msScrollChaining",
    "msScrollLimit",
    "msScrollLimitXMax",
    "msScrollLimitXMin",
    "msScrollLimitYMax",
    "msScrollLimitYMin",
    "msScrollRails",
    "msScrollSnapPointsX",
    "msScrollSnapPointsY",
    "msScrollSnapType",
    "msScrollSnapX",
    "msScrollSnapY",
    "msScrollTranslation",
    "msSetImmediate",
    "msSetMediaKeys",
    "msSetPointerCapture",
    "msTextCombineHorizontal",
    "msTextSizeAdjust",
    "msToBlob",
    "msTouchAction",
    "msTouchSelect",
    "msTraceAsyncCallbackCompleted",
    "msTraceAsyncCallbackStarting",
    "msTraceAsyncOperationCompleted",
    "msTraceAsyncOperationStarting",
    "msTransform",
    "msTransformOrigin",
    "msTransformStyle",
    "msTransition",
    "msTransitionDelay",
    "msTransitionDuration",
    "msTransitionProperty",
    "msTransitionTimingFunction",
    "msUnlockOrientation",
    "msUpdateAsyncCallbackRelation",
    "msUserSelect",
    "msVisibilityState",
    "msWrapFlow",
    "msWrapMargin",
    "msWrapThrough",
    "msWriteProfilerMark",
    "msZoom",
    "msZoomTo",
    "mt",
    "mul",
    "multiEntry",
    "multiSelectionObj",
    "multiline",
    "multiple",
    "multiply",
    "multiplySelf",
    "mutableFile",
    "muted",
    "n",
    "name",
    "nameProp",
    "namedItem",
    "namedRecordset",
    "names",
    "namespaceURI",
    "namespaces",
    "naturalHeight",
    "naturalWidth",
    "navigate",
    "navigation",
    "navigationMode",
    "navigationPreload",
    "navigationStart",
    "navigator",
    "near",
    "nearestViewportElement",
    "negative",
    "negotiated",
    "netscape",
    "networkState",
    "newScale",
    "newTranslate",
    "newURL",
    "newValue",
    "newValueSpecifiedUnits",
    "newVersion",
    "newhome",
    "next",
    "nextElementSibling",
    "nextHopProtocol",
    "nextNode",
    "nextPage",
    "nextSibling",
    "nickname",
    "noHref",
    "noModule",
    "noResize",
    "noShade",
    "noValidate",
    "noWrap",
    "node",
    "nodeName",
    "nodeType",
    "nodeValue",
    "nonce",
    "normalize",
    "normalizedPathSegList",
    "notationName",
    "notations",
    "note",
    "noteGrainOn",
    "noteOff",
    "noteOn",
    "notify",
    "now",
    "numOctaves",
    "number",
    "numberOfChannels",
    "numberOfInputs",
    "numberOfItems",
    "numberOfOutputs",
    "numberValue",
    "oMatchesSelector",
    "object",
    "object-fit",
    "object-position",
    "objectFit",
    "objectPosition",
    "objectStore",
    "objectStoreNames",
    "objectType",
    "observe",
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    "scrollMarginInline",
    "scrollMarginInlineEnd",
    "scrollMarginInlineStart",
    "scrollMarginLeft",
    "scrollMarginRight",
    "scrollMarginTop",
    "scrollMaxX",
    "scrollMaxY",
    "scrollPadding",
    "scrollPaddingBlock",
    "scrollPaddingBlockEnd",
    "scrollPaddingBlockStart",
    "scrollPaddingBottom",
    "scrollPaddingInline",
    "scrollPaddingInlineEnd",
    "scrollPaddingInlineStart",
    "scrollPaddingLeft",
    "scrollPaddingRight",
    "scrollPaddingTop",
    "scrollRestoration",
    "scrollSnapAlign",
    "scrollSnapType",
    "scrollTo",
    "scrollTop",
    "scrollTopMax",
    "scrollWidth",
    "scrollX",
    "scrollY",
    "scrollbar-color",
    "scrollbar-width",
    "scrollbar3dLightColor",
    "scrollbarArrowColor",
    "scrollbarBaseColor",
    "scrollbarColor",
    "scrollbarDarkShadowColor",
    "scrollbarFaceColor",
    "scrollbarHighlightColor",
    "scrollbarShadowColor",
    "scrollbarTrackColor",
    "scrollbarWidth",
    "scrollbars",
    "scrolling",
    "scrollingElement",
    "sctp",
    "sctpCauseCode",
    "sdp",
    "sdpLineNumber",
    "sdpMLineIndex",
    "sdpMid",
    "seal",
    "search",
    "searchBox",
    "searchBoxJavaBridge_",
    "searchParams",
    "sectionRowIndex",
    "secureConnectionStart",
    "security",
    "seed",
    "seekToNextFrame",
    "seekable",
    "seeking",
    "select",
    "selectAllChildren",
    "selectAlternateInterface",
    "selectConfiguration",
    "selectNode",
    "selectNodeContents",
    "selectNodes",
    "selectSingleNode",
    "selectSubString",
    "selected",
    "selectedIndex",
    "selectedOptions",
    "selectedStyleSheetSet",
    "selectedStylesheetSet",
    "selection",
    "selectionDirection",
    "selectionEnd",
    "selectionStart",
    "selector",
    "selectorText",
    "self",
    "send",
    "sendAsBinary",
    "sendBeacon",
    "sender",
    "sentAlert",
    "sentTimestamp",
    "separator",
    "serialNumber",
    "serializeToString",
    "serverTiming",
    "service",
    "serviceWorker",
    "session",
    "sessionId",
    "sessionStorage",
    "set",
    "setActionHandler",
    "setActive",
    "setAlpha",
    "setAppBadge",
    "setAttribute",
    "setAttributeNS",
    "setAttributeNode",
    "setAttributeNodeNS",
    "setBaseAndExtent",
    "setBigInt64",
    "setBigUint64",
    "setBingCurrentSearchDefault",
    "setCapture",
    "setCodecPreferences",
    "setColor",
    "setCompositeOperation",
    "setConfiguration",
    "setCurrentTime",
    "setCustomValidity",
    "setData",
    "setDate",
    "setDragImage",
    "setEnd",
    "setEndAfter",
    "setEndBefore",
    "setEndPoint",
    "setFillColor",
    "setFilterRes",
    "setFloat32",
    "setFloat64",
    "setFloatValue",
    "setFormValue",
    "setFullYear",
    "setHeaderValue",
    "setHours",
    "setIdentityProvider",
    "setImmediate",
    "setInt16",
    "setInt32",
    "setInt8",
    "setInterval",
    "setItem",
    "setKeyframes",
    "setLineCap",
    "setLineDash",
    "setLineJoin",
    "setLineWidth",
    "setLiveSeekableRange",
    "setLocalDescription",
    "setMatrix",
    "setMatrixValue",
    "setMediaKeys",
    "setMilliseconds",
    "setMinutes",
    "setMiterLimit",
    "setMonth",
    "setNamedItem",
    "setNamedItemNS",
    "setNonUserCodeExceptions",
    "setOrientToAngle",
    "setOrientToAuto",
    "setOrientation",
    "setOverrideHistoryNavigationMode",
    "setPaint",
    "setParameter",
    "setParameters",
    "setPeriodicWave",
    "setPointerCapture",
    "setPosition",
    "setPositionState",
    "setPreference",
    "setProperty",
    "setPrototypeOf",
    "setRGBColor",
    "setRGBColorICCColor",
    "setRadius",
    "setRangeText",
    "setRemoteDescription",
    "setRequestHeader",
    "setResizable",
    "setResourceTimingBufferSize",
    "setRotate",
    "setScale",
    "setSeconds",
    "setSelectionRange",
    "setServerCertificate",
    "setShadow",
    "setSinkId",
    "setSkewX",
    "setSkewY",
    "setStart",
    "setStartAfter",
    "setStartBefore",
    "setStdDeviation",
    "setStreams",
    "setStringValue",
    "setStrokeColor",
    "setSuggestResult",
    "setTargetAtTime",
    "setTargetValueAtTime",
    "setTime",
    "setTimeout",
    "setTransform",
    "setTranslate",
    "setUTCDate",
    "setUTCFullYear",
    "setUTCHours",
    "setUTCMilliseconds",
    "setUTCMinutes",
    "setUTCMonth",
    "setUTCSeconds",
    "setUint16",
    "setUint32",
    "setUint8",
    "setUri",
    "setValidity",
    "setValueAtTime",
    "setValueCurveAtTime",
    "setVariable",
    "setVelocity",
    "setVersion",
    "setYear",
    "settingName",
    "settingValue",
    "sex",
    "shaderSource",
    "shadowBlur",
    "shadowColor",
    "shadowOffsetX",
    "shadowOffsetY",
    "shadowRoot",
    "shape",
    "shape-image-threshold",
    "shape-margin",
    "shape-outside",
    "shape-rendering",
    "shapeImageThreshold",
    "shapeMargin",
    "shapeOutside",
    "shapeRendering",
    "sheet",
    "shift",
    "shiftKey",
    "shiftLeft",
    "shippingAddress",
    "shippingOption",
    "shippingType",
    "show",
    "showHelp",
    "showModal",
    "showModalDialog",
    "showModelessDialog",
    "showNotification",
    "sidebar",
    "sign",
    "signal",
    "signalingState",
    "signature",
    "silent",
    "sin",
    "singleNodeValue",
    "sinh",
    "sinkId",
    "sittingToStandingTransform",
    "size",
    "sizeToContent",
    "sizeX",
    "sizeZ",
    "sizes",
    "skewX",
    "skewXSelf",
    "skewY",
    "skewYSelf",
    "slice",
    "slope",
    "slot",
    "small",
    "smil",
    "smooth",
    "smoothingTimeConstant",
    "snapToLines",
    "snapshotItem",
    "snapshotLength",
    "some",
    "sort",
    "sortingCode",
    "source",
    "sourceBuffer",
    "sourceBuffers",
    "sourceCapabilities",
    "sourceFile",
    "sourceIndex",
    "sources",
    "spacing",
    "span",
    "speak",
    "speakAs",
    "speaking",
    "species",
    "specified",
    "specularConstant",
    "specularExponent",
    "speechSynthesis",
    "speed",
    "speedOfSound",
    "spellcheck",
    "splice",
    "split",
    "splitText",
    "spreadMethod",
    "sqrt",
    "src",
    "srcElement",
    "srcFilter",
    "srcObject",
    "srcUrn",
    "srcdoc",
    "srclang",
    "srcset",
    "stack",
    "stackTraceLimit",
    "stacktrace",
    "stageParameters",
    "standalone",
    "standby",
    "start",
    "startContainer",
    "startIce",
    "startMessages",
    "startNotifications",
    "startOffset",
    "startProfiling",
    "startRendering",
    "startShark",
    "startTime",
    "startsWith",
    "state",
    "status",
    "statusCode",
    "statusMessage",
    "statusText",
    "statusbar",
    "stdDeviationX",
    "stdDeviationY",
    "stencilFunc",
    "stencilFuncSeparate",
    "stencilMask",
    "stencilMaskSeparate",
    "stencilOp",
    "stencilOpSeparate",
    "step",
    "stepDown",
    "stepMismatch",
    "stepUp",
    "sticky",
    "stitchTiles",
    "stop",
    "stop-color",
    "stop-opacity",
    "stopColor",
    "stopImmediatePropagation",
    "stopNotifications",
    "stopOpacity",
    "stopProfiling",
    "stopPropagation",
    "stopShark",
    "stopped",
    "storage",
    "storageArea",
    "storageName",
    "storageStatus",
    "store",
    "storeSiteSpecificTrackingException",
    "storeWebWideTrackingException",
    "stpVersion",
    "stream",
    "streams",
    "stretch",
    "strike",
    "string",
    "stringValue",
    "stringify",
    "stroke",
    "stroke-dasharray",
    "stroke-dashoffset",
    "stroke-linecap",
    "stroke-linejoin",
    "stroke-miterlimit",
    "stroke-opacity",
    "stroke-width",
    "strokeDasharray",
    "strokeDashoffset",
    "strokeLinecap",
    "strokeLinejoin",
    "strokeMiterlimit",
    "strokeOpacity",
    "strokeRect",
    "strokeStyle",
    "strokeText",
    "strokeWidth",
    "style",
    "styleFloat",
    "styleMap",
    "styleMedia",
    "styleSheet",
    "styleSheetSets",
    "styleSheets",
    "sub",
    "subarray",
    "subject",
    "submit",
    "submitFrame",
    "submitter",
    "subscribe",
    "substr",
    "substring",
    "substringData",
    "subtle",
    "subtree",
    "suffix",
    "suffixes",
    "summary",
    "sup",
    "supported",
    "supportedContentEncodings",
    "supportedEntryTypes",
    "supports",
    "supportsSession",
    "surfaceScale",
    "surroundContents",
    "suspend",
    "suspendRedraw",
    "swapCache",
    "swapNode",
    "sweepFlag",
    "symbols",
    "sync",
    "sysexEnabled",
    "system",
    "systemCode",
    "systemId",
    "systemLanguage",
    "systemXDPI",
    "systemYDPI",
    "tBodies",
    "tFoot",
    "tHead",
    "tabIndex",
    "table",
    "table-layout",
    "tableLayout",
    "tableValues",
    "tag",
    "tagName",
    "tagUrn",
    "tags",
    "taintEnabled",
    "takePhoto",
    "takeRecords",
    "tan",
    "tangentialPressure",
    "tanh",
    "target",
    "targetElement",
    "targetRayMode",
    "targetRaySpace",
    "targetTouches",
    "targetX",
    "targetY",
    "tcpType",
    "tee",
    "tel",
    "terminate",
    "test",
    "texImage2D",
    "texImage3D",
    "texParameterf",
    "texParameteri",
    "texStorage2D",
    "texStorage3D",
    "texSubImage2D",
    "texSubImage3D",
    "text",
    "text-align",
    "text-align-last",
    "text-anchor",
    "text-combine-upright",
    "text-decoration",
    "text-decoration-color",
    "text-decoration-line",
    "text-decoration-skip-ink",
    "text-decoration-style",
    "text-decoration-thickness",
    "text-emphasis",
    "text-emphasis-color",
    "text-emphasis-position",
    "text-emphasis-style",
    "text-indent",
    "text-justify",
    "text-orientation",
    "text-overflow",
    "text-rendering",
    "text-shadow",
    "text-transform",
    "text-underline-offset",
    "text-underline-position",
    "textAlign",
    "textAlignLast",
    "textAnchor",
    "textAutospace",
    "textBaseline",
    "textCombineUpright",
    "textContent",
    "textDecoration",
    "textDecorationBlink",
    "textDecorationColor",
    "textDecorationLine",
    "textDecorationLineThrough",
    "textDecorationNone",
    "textDecorationOverline",
    "textDecorationSkipInk",
    "textDecorationStyle",
    "textDecorationThickness",
    "textDecorationUnderline",
    "textEmphasis",
    "textEmphasisColor",
    "textEmphasisPosition",
    "textEmphasisStyle",
    "textIndent",
    "textJustify",
    "textJustifyTrim",
    "textKashida",
    "textKashidaSpace",
    "textLength",
    "textOrientation",
    "textOverflow",
    "textRendering",
    "textShadow",
    "textTracks",
    "textTransform",
    "textUnderlineOffset",
    "textUnderlinePosition",
    "then",
    "threadId",
    "threshold",
    "thresholds",
    "tiltX",
    "tiltY",
    "time",
    "timeEnd",
    "timeLog",
    "timeOrigin",
    "timeRemaining",
    "timeStamp",
    "timecode",
    "timeline",
    "timelineTime",
    "timeout",
    "timestamp",
    "timestampOffset",
    "timing",
    "title",
    "to",
    "toArray",
    "toBlob",
    "toDataURL",
    "toDateString",
    "toElement",
    "toExponential",
    "toFixed",
    "toFloat32Array",
    "toFloat64Array",
    "toGMTString",
    "toISOString",
    "toJSON",
    "toLocaleDateString",
    "toLocaleFormat",
    "toLocaleLowerCase",
    "toLocaleString",
    "toLocaleTimeString",
    "toLocaleUpperCase",
    "toLowerCase",
    "toMatrix",
    "toMethod",
    "toPrecision",
    "toPrimitive",
    "toSdp",
    "toSource",
    "toStaticHTML",
    "toString",
    "toStringTag",
    "toSum",
    "toTimeString",
    "toUTCString",
    "toUpperCase",
    "toggle",
    "toggleAttribute",
    "toggleLongPressEnabled",
    "tone",
    "toneBuffer",
    "tooLong",
    "tooShort",
    "toolbar",
    "top",
    "topMargin",
    "total",
    "totalFrameDelay",
    "totalVideoFrames",
    "touch-action",
    "touchAction",
    "touched",
    "touches",
    "trace",
    "track",
    "trackVisibility",
    "transaction",
    "transactions",
    "transceiver",
    "transferControlToOffscreen",
    "transferFromImageBitmap",
    "transferImageBitmap",
    "transferIn",
    "transferOut",
    "transferSize",
    "transferToImageBitmap",
    "transform",
    "transform-box",
    "transform-origin",
    "transform-style",
    "transformBox",
    "transformFeedbackVaryings",
    "transformOrigin",
    "transformPoint",
    "transformString",
    "transformStyle",
    "transformToDocument",
    "transformToFragment",
    "transition",
    "transition-delay",
    "transition-duration",
    "transition-property",
    "transition-timing-function",
    "transitionDelay",
    "transitionDuration",
    "transitionProperty",
    "transitionTimingFunction",
    "translate",
    "translateSelf",
    "translationX",
    "translationY",
    "transport",
    "trim",
    "trimEnd",
    "trimLeft",
    "trimRight",
    "trimStart",
    "trueSpeed",
    "trunc",
    "truncate",
    "trustedTypes",
    "turn",
    "twist",
    "type",
    "typeDetail",
    "typeMismatch",
    "typeMustMatch",
    "types",
    "u2f",
    "ubound",
    "uint16",
    "uint32",
    "uint8",
    "uint8Clamped",
    "undefined",
    "unescape",
    "uneval",
    "unicode",
    "unicode-bidi",
    "unicodeBidi",
    "unicodeRange",
    "uniform1f",
    "uniform1fv",
    "uniform1i",
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    "uniformMatrix3fv",
    "uniformMatrix3x2fv",
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    "uniformMatrix4fv",
    "uniformMatrix4x2fv",
    "uniformMatrix4x3fv",
    "unique",
    "uniqueID",
    "uniqueNumber",
    "unit",
    "unitType",
    "units",
    "unloadEventEnd",
    "unloadEventStart",
    "unlock",
    "unmount",
    "unobserve",
    "unpause",
    "unpauseAnimations",
    "unreadCount",
    "unregister",
    "unregisterContentHandler",
    "unregisterProtocolHandler",
    "unscopables",
    "unselectable",
    "unshift",
    "unsubscribe",
    "unsuspendRedraw",
    "unsuspendRedrawAll",
    "unwatch",
    "unwrapKey",
    "upDegrees",
    "upX",
    "upY",
    "upZ",
    "update",
    "updateCommands",
    "updateIce",
    "updateInterval",
    "updatePlaybackRate",
    "updateRenderState",
    "updateSettings",
    "updateTiming",
    "updateViaCache",
    "updateWith",
    "updated",
    "updating",
    "upgrade",
    "upload",
    "uploadTotal",
    "uploaded",
    "upper",
    "upperBound",
    "upperOpen",
    "uri",
    "url",
    "urn",
    "urns",
    "usages",
    "usb",
    "usbVersionMajor",
    "usbVersionMinor",
    "usbVersionSubminor",
    "useCurrentView",
    "useMap",
    "useProgram",
    "usedSpace",
    "user-select",
    "userActivation",
    "userAgent",
    "userAgentData",
    "userChoice",
    "userHandle",
    "userHint",
    "userLanguage",
    "userSelect",
    "userVisibleOnly",
    "username",
    "usernameFragment",
    "utterance",
    "uuid",
    "v8BreakIterator",
    "vAlign",
    "vLink",
    "valid",
    "validate",
    "validateProgram",
    "validationMessage",
    "validity",
    "value",
    "valueAsDate",
    "valueAsNumber",
    "valueAsString",
    "valueInSpecifiedUnits",
    "valueMissing",
    "valueOf",
    "valueText",
    "valueType",
    "values",
    "variable",
    "variant",
    "variationSettings",
    "vector-effect",
    "vectorEffect",
    "velocityAngular",
    "velocityExpansion",
    "velocityX",
    "velocityY",
    "vendor",
    "vendorId",
    "vendorSub",
    "verify",
    "version",
    "vertexAttrib1f",
    "vertexAttrib1fv",
    "vertexAttrib2f",
    "vertexAttrib2fv",
    "vertexAttrib3f",
    "vertexAttrib3fv",
    "vertexAttrib4f",
    "vertexAttrib4fv",
    "vertexAttribDivisor",
    "vertexAttribDivisorANGLE",
    "vertexAttribI4i",
    "vertexAttribI4iv",
    "vertexAttribI4ui",
    "vertexAttribI4uiv",
    "vertexAttribIPointer",
    "vertexAttribPointer",
    "vertical",
    "vertical-align",
    "verticalAlign",
    "verticalOverflow",
    "vh",
    "vibrate",
    "vibrationActuator",
    "videoBitsPerSecond",
    "videoHeight",
    "videoTracks",
    "videoWidth",
    "view",
    "viewBox",
    "viewBoxString",
    "viewTarget",
    "viewTargetString",
    "viewport",
    "viewportAnchorX",
    "viewportAnchorY",
    "viewportElement",
    "views",
    "violatedDirective",
    "visibility",
    "visibilityState",
    "visible",
    "visualViewport",
    "vlinkColor",
    "vmax",
    "vmin",
    "voice",
    "voiceURI",
    "volume",
    "vrml",
    "vspace",
    "vw",
    "w",
    "wait",
    "waitSync",
    "waiting",
    "wake",
    "wakeLock",
    "wand",
    "warn",
    "wasClean",
    "wasDiscarded",
    "watch",
    "watchAvailability",
    "watchPosition",
    "webdriver",
    "webkitAddKey",
    "webkitAlignContent",
    "webkitAlignItems",
    "webkitAlignSelf",
    "webkitAnimation",
    "webkitAnimationDelay",
    "webkitAnimationDirection",
    "webkitAnimationDuration",
    "webkitAnimationFillMode",
    "webkitAnimationIterationCount",
    "webkitAnimationName",
    "webkitAnimationPlayState",
    "webkitAnimationTimingFunction",
    "webkitAppearance",
    "webkitAudioContext",
    "webkitAudioDecodedByteCount",
    "webkitAudioPannerNode",
    "webkitBackfaceVisibility",
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    "webkitBackgroundAttachment",
    "webkitBackgroundClip",
    "webkitBackgroundColor",
    "webkitBackgroundImage",
    "webkitBackgroundOrigin",
    "webkitBackgroundPosition",
    "webkitBackgroundPositionX",
    "webkitBackgroundPositionY",
    "webkitBackgroundRepeat",
    "webkitBackgroundSize",
    "webkitBackingStorePixelRatio",
    "webkitBorderBottomLeftRadius",
    "webkitBorderBottomRightRadius",
    "webkitBorderImage",
    "webkitBorderImageOutset",
    "webkitBorderImageRepeat",
    "webkitBorderImageSlice",
    "webkitBorderImageSource",
    "webkitBorderImageWidth",
    "webkitBorderRadius",
    "webkitBorderTopLeftRadius",
    "webkitBorderTopRightRadius",
    "webkitBoxAlign",
    "webkitBoxDirection",
    "webkitBoxFlex",
    "webkitBoxOrdinalGroup",
    "webkitBoxOrient",
    "webkitBoxPack",
    "webkitBoxShadow",
    "webkitBoxSizing",
    "webkitCancelAnimationFrame",
    "webkitCancelFullScreen",
    "webkitCancelKeyRequest",
    "webkitCancelRequestAnimationFrame",
    "webkitClearResourceTimings",
    "webkitClosedCaptionsVisible",
    "webkitConvertPointFromNodeToPage",
    "webkitConvertPointFromPageToNode",
    "webkitCreateShadowRoot",
    "webkitCurrentFullScreenElement",
    "webkitCurrentPlaybackTargetIsWireless",
    "webkitDecodedFrameCount",
    "webkitDirectionInvertedFromDevice",
    "webkitDisplayingFullscreen",
    "webkitDroppedFrameCount",
    "webkitEnterFullScreen",
    "webkitEnterFullscreen",
    "webkitEntries",
    "webkitExitFullScreen",
    "webkitExitFullscreen",
    "webkitExitPointerLock",
    "webkitFilter",
    "webkitFlex",
    "webkitFlexBasis",
    "webkitFlexDirection",
    "webkitFlexFlow",
    "webkitFlexGrow",
    "webkitFlexShrink",
    "webkitFlexWrap",
    "webkitFullScreenKeyboardInputAllowed",
    "webkitFullscreenElement",
    "webkitFullscreenEnabled",
    "webkitGenerateKeyRequest",
    "webkitGetAsEntry",
    "webkitGetDatabaseNames",
    "webkitGetEntries",
    "webkitGetEntriesByName",
    "webkitGetEntriesByType",
    "webkitGetFlowByName",
    "webkitGetGamepads",
    "webkitGetImageDataHD",
    "webkitGetNamedFlows",
    "webkitGetRegionFlowRanges",
    "webkitGetUserMedia",
    "webkitHasClosedCaptions",
    "webkitHidden",
    "webkitIDBCursor",
    "webkitIDBDatabase",
    "webkitIDBDatabaseError",
    "webkitIDBDatabaseException",
    "webkitIDBFactory",
    "webkitIDBIndex",
    "webkitIDBKeyRange",
    "webkitIDBObjectStore",
    "webkitIDBRequest",
    "webkitIDBTransaction",
    "webkitImageSmoothingEnabled",
    "webkitIndexedDB",
    "webkitInitMessageEvent",
    "webkitIsFullScreen",
    "webkitJustifyContent",
    "webkitKeys",
    "webkitLineClamp",
    "webkitLineDashOffset",
    "webkitLockOrientation",
    "webkitMask",
    "webkitMaskClip",
    "webkitMaskComposite",
    "webkitMaskImage",
    "webkitMaskOrigin",
    "webkitMaskPosition",
    "webkitMaskPositionX",
    "webkitMaskPositionY",
    "webkitMaskRepeat",
    "webkitMaskSize",
    "webkitMatchesSelector",
    "webkitMediaStream",
    "webkitNotifications",
    "webkitOfflineAudioContext",
    "webkitOrder",
    "webkitOrientation",
    "webkitPeerConnection00",
    "webkitPersistentStorage",
    "webkitPerspective",
    "webkitPerspectiveOrigin",
    "webkitPointerLockElement",
    "webkitPostMessage",
    "webkitPreservesPitch",
    "webkitPutImageDataHD",
    "webkitRTCPeerConnection",
    "webkitRegionOverset",
    "webkitRelativePath",
    "webkitRequestAnimationFrame",
    "webkitRequestFileSystem",
    "webkitRequestFullScreen",
    "webkitRequestFullscreen",
    "webkitRequestPointerLock",
    "webkitResolveLocalFileSystemURL",
    "webkitSetMediaKeys",
    "webkitSetResourceTimingBufferSize",
    "webkitShadowRoot",
    "webkitShowPlaybackTargetPicker",
    "webkitSlice",
    "webkitSpeechGrammar",
    "webkitSpeechGrammarList",
    "webkitSpeechRecognition",
    "webkitSpeechRecognitionError",
    "webkitSpeechRecognitionEvent",
    "webkitStorageInfo",
    "webkitSupportsFullscreen",
    "webkitTemporaryStorage",
    "webkitTextFillColor",
    "webkitTextSizeAdjust",
    "webkitTextStroke",
    "webkitTextStrokeColor",
    "webkitTextStrokeWidth",
    "webkitTransform",
    "webkitTransformOrigin",
    "webkitTransformStyle",
    "webkitTransition",
    "webkitTransitionDelay",
    "webkitTransitionDuration",
    "webkitTransitionProperty",
    "webkitTransitionTimingFunction",
    "webkitURL",
    "webkitUnlockOrientation",
    "webkitUserSelect",
    "webkitVideoDecodedByteCount",
    "webkitVisibilityState",
    "webkitWirelessVideoPlaybackDisabled",
    "webkitdirectory",
    "webkitdropzone",
    "webstore",
    "weight",
    "whatToShow",
    "wheelDelta",
    "wheelDeltaX",
    "wheelDeltaY",
    "whenDefined",
    "which",
    "white-space",
    "whiteSpace",
    "wholeText",
    "widows",
    "width",
    "will-change",
    "willChange",
    "willValidate",
    "window",
    "withCredentials",
    "word-break",
    "word-spacing",
    "word-wrap",
    "wordBreak",
    "wordSpacing",
    "wordWrap",
    "workerStart",
    "wow64",
    "wrap",
    "wrapKey",
    "writable",
    "writableAuxiliaries",
    "write",
    "writeText",
    "writeValue",
    "writeWithoutResponse",
    "writeln",
    "writing-mode",
    "writingMode",
    "x",
    "x1",
    "x2",
    "xChannelSelector",
    "xmlEncoding",
    "xmlStandalone",
    "xmlVersion",
    "xmlbase",
    "xmllang",
    "xmlspace",
    "xor",
    "xr",
    "y",
    "y1",
    "y2",
    "yChannelSelector",
    "yandex",
    "z",
    "z-index",
    "zIndex",
    "zoom",
    "zoomAndPan",
    "zoomRectScreen",
];

function find_builtins(reserved) {
    domprops.forEach(add);

    // Compatibility fix for some standard defined globals not defined on every js environment
    var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
    var objects = {};
    var global_ref = typeof global$1 === "object" ? global$1 : self;

    new_globals.forEach(function (new_global) {
        objects[new_global] = global_ref[new_global] || function() {};
    });

    [
        "null",
        "true",
        "false",
        "NaN",
        "Infinity",
        "-Infinity",
        "undefined",
    ].forEach(add);
    [ Object, Array, Function, Number,
      String, Boolean, Error, Math,
      Date, RegExp, objects.Symbol, ArrayBuffer,
      DataView, decodeURI, decodeURIComponent,
      encodeURI, encodeURIComponent, eval, EvalError,
      Float32Array, Float64Array, Int8Array, Int16Array,
      Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
      parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
      objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
      Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
      objects.WeakMap, objects.WeakSet
    ].forEach(function(ctor) {
        Object.getOwnPropertyNames(ctor).map(add);
        if (ctor.prototype) {
            Object.getOwnPropertyNames(ctor.prototype).map(add);
        }
    });
    function add(name) {
        reserved.add(name);
    }
}

function reserve_quoted_keys(ast, reserved) {
    function add(name) {
        push_uniq(reserved, name);
    }

    ast.walk(new TreeWalker(function(node) {
        if (node instanceof AST_ObjectKeyVal && node.quote) {
            add(node.key);
        } else if (node instanceof AST_ObjectProperty && node.quote) {
            add(node.key.name);
        } else if (node instanceof AST_Sub) {
            addStrings(node.property, add);
        }
    }));
}

function addStrings(node, add) {
    node.walk(new TreeWalker(function(node) {
        if (node instanceof AST_Sequence) {
            addStrings(node.tail_node(), add);
        } else if (node instanceof AST_String) {
            add(node.value);
        } else if (node instanceof AST_Conditional) {
            addStrings(node.consequent, add);
            addStrings(node.alternative, add);
        }
        return true;
    }));
}

function mangle_private_properties(ast, options) {
    var cprivate = -1;
    var private_cache = new Map();
    var nth_identifier = options.nth_identifier || base54;

    ast =  ast.transform(new TreeTransformer(function(node) {
        if (
            node instanceof AST_ClassPrivateProperty
            || node instanceof AST_PrivateMethod
            || node instanceof AST_PrivateGetter
            || node instanceof AST_PrivateSetter
        ) {
            node.key.name = mangle_private(node.key.name);
        } else if (node instanceof AST_DotHash) {
            node.property = mangle_private(node.property);
        }
    }));
    return ast;

    function mangle_private(name) {
        let mangled = private_cache.get(name);
        if (!mangled) {
            mangled = nth_identifier.get(++cprivate);
            private_cache.set(name, mangled);
        }

        return mangled;
    }
}

function mangle_properties(ast, options) {
    options = defaults(options, {
        builtins: false,
        cache: null,
        debug: false,
        keep_quoted: false,
        nth_identifier: base54,
        only_cache: false,
        regex: null,
        reserved: null,
        undeclared: false,
    }, true);

    var nth_identifier = options.nth_identifier;

    var reserved_option = options.reserved;
    if (!Array.isArray(reserved_option)) reserved_option = [reserved_option];
    var reserved = new Set(reserved_option);
    if (!options.builtins) find_builtins(reserved);

    var cname = -1;

    var cache;
    if (options.cache) {
        cache = options.cache.props;
    } else {
        cache = new Map();
    }

    var regex = options.regex && new RegExp(options.regex);

    // note debug is either false (disabled), or a string of the debug suffix to use (enabled).
    // note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
    // the same as passing an empty string.
    var debug = options.debug !== false;
    var debug_name_suffix;
    if (debug) {
        debug_name_suffix = (options.debug === true ? "" : options.debug);
    }

    var names_to_mangle = new Set();
    var unmangleable = new Set();
    // Track each already-mangled name to prevent nth_identifier from generating
    // the same name.
    cache.forEach((mangled_name) => unmangleable.add(mangled_name));

    var keep_quoted = !!options.keep_quoted;

    // step 1: find candidates to mangle
    ast.walk(new TreeWalker(function(node) {
        if (
            node instanceof AST_ClassPrivateProperty
            || node instanceof AST_PrivateMethod
            || node instanceof AST_PrivateGetter
            || node instanceof AST_PrivateSetter
            || node instanceof AST_DotHash
        ) ; else if (node instanceof AST_ObjectKeyVal) {
            if (typeof node.key == "string" && (!keep_quoted || !node.quote)) {
                add(node.key);
            }
        } else if (node instanceof AST_ObjectProperty) {
            // setter or getter, since KeyVal is handled above
            if (!keep_quoted || !node.quote) {
                add(node.key.name);
            }
        } else if (node instanceof AST_Dot) {
            var declared = !!options.undeclared;
            if (!declared) {
                var root = node;
                while (root.expression) {
                    root = root.expression;
                }
                declared = !(root.thedef && root.thedef.undeclared);
            }
            if (declared &&
                (!keep_quoted || !node.quote)) {
                add(node.property);
            }
        } else if (node instanceof AST_Sub) {
            if (!keep_quoted) {
                addStrings(node.property, add);
            }
        } else if (node instanceof AST_Call
            && node.expression.print_to_string() == "Object.defineProperty") {
            addStrings(node.args[1], add);
        } else if (node instanceof AST_Binary && node.operator === "in") {
            addStrings(node.left, add);
        }
    }));

    // step 2: transform the tree, renaming properties
    return ast.transform(new TreeTransformer(function(node) {
        if (
            node instanceof AST_ClassPrivateProperty
            || node instanceof AST_PrivateMethod
            || node instanceof AST_PrivateGetter
            || node instanceof AST_PrivateSetter
            || node instanceof AST_DotHash
        ) ; else if (node instanceof AST_ObjectKeyVal) {
            if (typeof node.key == "string" && (!keep_quoted || !node.quote)) {
                node.key = mangle(node.key);
            }
        } else if (node instanceof AST_ObjectProperty) {
            // setter, getter, method or class field
            if (!keep_quoted || !node.quote) {
                node.key.name = mangle(node.key.name);
            }
        } else if (node instanceof AST_Dot) {
            if (!keep_quoted || !node.quote) {
                node.property = mangle(node.property);
            }
        } else if (!keep_quoted && node instanceof AST_Sub) {
            node.property = mangleStrings(node.property);
        } else if (node instanceof AST_Call
            && node.expression.print_to_string() == "Object.defineProperty") {
            node.args[1] = mangleStrings(node.args[1]);
        } else if (node instanceof AST_Binary && node.operator === "in") {
            node.left = mangleStrings(node.left);
        }
    }));

    // only function declarations after this line

    function can_mangle(name) {
        if (unmangleable.has(name)) return false;
        if (reserved.has(name)) return false;
        if (options.only_cache) {
            return cache.has(name);
        }
        if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
        return true;
    }

    function should_mangle(name) {
        if (regex && !regex.test(name)) return false;
        if (reserved.has(name)) return false;
        return cache.has(name)
            || names_to_mangle.has(name);
    }

    function add(name) {
        if (can_mangle(name))
            names_to_mangle.add(name);

        if (!should_mangle(name)) {
            unmangleable.add(name);
        }
    }

    function mangle(name) {
        if (!should_mangle(name)) {
            return name;
        }

        var mangled = cache.get(name);
        if (!mangled) {
            if (debug) {
                // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
                var debug_mangled = "_$" + name + "$" + debug_name_suffix + "_";

                if (can_mangle(debug_mangled)) {
                    mangled = debug_mangled;
                }
            }

            // either debug mode is off, or it is on and we could not use the mangled name
            if (!mangled) {
                do {
                    mangled = nth_identifier.get(++cname);
                } while (!can_mangle(mangled));
            }

            cache.set(name, mangled);
        }
        return mangled;
    }

    function mangleStrings(node) {
        return node.transform(new TreeTransformer(function(node) {
            if (node instanceof AST_Sequence) {
                var last = node.expressions.length - 1;
                node.expressions[last] = mangleStrings(node.expressions[last]);
            } else if (node instanceof AST_String) {
                node.value = mangle(node.value);
            } else if (node instanceof AST_Conditional) {
                node.consequent = mangleStrings(node.consequent);
                node.alternative = mangleStrings(node.alternative);
            }
            return node;
        }));
    }
}

var to_ascii = typeof atob == "undefined" ? function(b64) {
    return Buffer$1.from(b64, "base64").toString();
} : atob;
var to_base64 = typeof btoa == "undefined" ? function(str) {
    return Buffer$1.from(str).toString("base64");
} : btoa;

function read_source_map(code) {
    var match = /(?:^|[^.])\/\/# sourceMappingURL=data:application\/json(;[\w=-]*)?;base64,([+/0-9A-Za-z]*=*)\s*$/.exec(code);
    if (!match) {
        console.warn("inline source map not found");
        return null;
    }
    return to_ascii(match[2]);
}

function set_shorthand(name, options, keys) {
    if (options[name]) {
        keys.forEach(function(key) {
            if (options[key]) {
                if (typeof options[key] != "object") options[key] = {};
                if (!(name in options[key])) options[key][name] = options[name];
            }
        });
    }
}

function init_cache(cache) {
    if (!cache) return;
    if (!("props" in cache)) {
        cache.props = new Map();
    } else if (!(cache.props instanceof Map)) {
        cache.props = map_from_object(cache.props);
    }
}

function cache_to_json(cache) {
    return {
        props: map_to_object(cache.props)
    };
}

function log_input(files, options, fs, debug_folder) {
    if (!(fs && fs.writeFileSync && fs.mkdirSync)) {
        return;
    }

    try {
        fs.mkdirSync(debug_folder);
    } catch (e) {
        if (e.code !== "EEXIST") throw e;
    }

    const log_path = `${debug_folder}/terser-debug-${(Math.random() * 9999999) | 0}.log`;

    options = options || {};

    const options_str = JSON.stringify(options, (_key, thing) => {
        if (typeof thing === "function") return "[Function " + thing.toString() + "]";
        if (thing instanceof RegExp) return "[RegExp " + thing.toString() + "]";
        return thing;
    }, 4);

    const files_str = (file) => {
        if (typeof file === "object" && options.parse && options.parse.spidermonkey) {
            return JSON.stringify(file, null, 2);
        } else if (typeof file === "object") {
            return Object.keys(file)
                .map((key) => key + ": " + files_str(file[key]))
                .join("\n\n");
        } else if (typeof file === "string") {
            return "```\n" + file + "\n```";
        } else {
            return file; // What do?
        }
    };

    fs.writeFileSync(log_path, "Options: \n" + options_str + "\n\nInput files:\n\n" + files_str(files) + "\n");
}

async function minify$1(files, options, _fs_module) {
    if (
        _fs_module
        && typeof browser$1 === "object"
        && browser$1.env
        && typeof browser$1.env.TERSER_DEBUG_DIR === "string"
    ) {
        log_input(files, options, _fs_module, browser$1.env.TERSER_DEBUG_DIR);
    }

    options = defaults(options, {
        compress: {},
        ecma: undefined,
        enclose: false,
        ie8: false,
        keep_classnames: undefined,
        keep_fnames: false,
        mangle: {},
        module: false,
        nameCache: null,
        output: null,
        format: null,
        parse: {},
        rename: undefined,
        safari10: false,
        sourceMap: false,
        spidermonkey: false,
        timings: false,
        toplevel: false,
        warnings: false,
        wrap: false,
    }, true);

    var timings = options.timings && {
        start: Date.now()
    };
    if (options.keep_classnames === undefined) {
        options.keep_classnames = options.keep_fnames;
    }
    if (options.rename === undefined) {
        options.rename = options.compress && options.mangle;
    }
    if (options.output && options.format) {
        throw new Error("Please only specify either output or format option, preferrably format.");
    }
    options.format = options.format || options.output || {};
    set_shorthand("ecma", options, [ "parse", "compress", "format" ]);
    set_shorthand("ie8", options, [ "compress", "mangle", "format" ]);
    set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
    set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
    set_shorthand("module", options, [ "parse", "compress", "mangle" ]);
    set_shorthand("safari10", options, [ "mangle", "format" ]);
    set_shorthand("toplevel", options, [ "compress", "mangle" ]);
    set_shorthand("warnings", options, [ "compress" ]); // legacy
    var quoted_props;
    if (options.mangle) {
        options.mangle = defaults(options.mangle, {
            cache: options.nameCache && (options.nameCache.vars || {}),
            eval: false,
            ie8: false,
            keep_classnames: false,
            keep_fnames: false,
            module: false,
            nth_identifier: base54,
            properties: false,
            reserved: [],
            safari10: false,
            toplevel: false,
        }, true);
        if (options.mangle.properties) {
            if (typeof options.mangle.properties != "object") {
                options.mangle.properties = {};
            }
            if (options.mangle.properties.keep_quoted) {
                quoted_props = options.mangle.properties.reserved;
                if (!Array.isArray(quoted_props)) quoted_props = [];
                options.mangle.properties.reserved = quoted_props;
            }
            if (options.nameCache && !("cache" in options.mangle.properties)) {
                options.mangle.properties.cache = options.nameCache.props || {};
            }
        }
        init_cache(options.mangle.cache);
        init_cache(options.mangle.properties.cache);
    }
    if (options.sourceMap) {
        options.sourceMap = defaults(options.sourceMap, {
            asObject: false,
            content: null,
            filename: null,
            includeSources: false,
            root: null,
            url: null,
        }, true);
    }

    // -- Parse phase --
    if (timings) timings.parse = Date.now();
    var toplevel;
    if (files instanceof AST_Toplevel) {
        toplevel = files;
    } else {
        if (typeof files == "string" || (options.parse.spidermonkey && !Array.isArray(files))) {
            files = [ files ];
        }
        options.parse = options.parse || {};
        options.parse.toplevel = null;

        if (options.parse.spidermonkey) {
            options.parse.toplevel = AST_Node.from_mozilla_ast(Object.keys(files).reduce(function(toplevel, name) {
                if (!toplevel) return files[name];
                toplevel.body = toplevel.body.concat(files[name].body);
                return toplevel;
            }, null));
        } else {
            delete options.parse.spidermonkey;

            for (var name in files) if (HOP(files, name)) {
                options.parse.filename = name;
                options.parse.toplevel = parse(files[name], options.parse);
                if (options.sourceMap && options.sourceMap.content == "inline") {
                    if (Object.keys(files).length > 1)
                        throw new Error("inline source map only works with singular input");
                    options.sourceMap.content = read_source_map(files[name]);
                }
            }
        }

        toplevel = options.parse.toplevel;
    }
    if (quoted_props && options.mangle.properties.keep_quoted !== "strict") {
        reserve_quoted_keys(toplevel, quoted_props);
    }
    if (options.wrap) {
        toplevel = toplevel.wrap_commonjs(options.wrap);
    }
    if (options.enclose) {
        toplevel = toplevel.wrap_enclose(options.enclose);
    }
    if (timings) timings.rename = Date.now();

    // -- Compress phase --
    if (timings) timings.compress = Date.now();
    if (options.compress) {
        toplevel = new Compressor(options.compress, {
            mangle_options: options.mangle
        }).compress(toplevel);
    }

    // -- Mangle phase --
    if (timings) timings.scope = Date.now();
    if (options.mangle) toplevel.figure_out_scope(options.mangle);
    if (timings) timings.mangle = Date.now();
    if (options.mangle) {
        toplevel.compute_char_frequency(options.mangle);
        toplevel.mangle_names(options.mangle);
        toplevel = mangle_private_properties(toplevel, options.mangle);
    }
    if (timings) timings.properties = Date.now();
    if (options.mangle && options.mangle.properties) {
        toplevel = mangle_properties(toplevel, options.mangle.properties);
    }

    // Format phase
    if (timings) timings.format = Date.now();
    var result = {};
    if (options.format.ast) {
        result.ast = toplevel;
    }
    if (options.format.spidermonkey) {
        result.ast = toplevel.to_mozilla_ast();
    }
    if (!HOP(options.format, "code") || options.format.code) {
        if (!options.format.ast) {
            // Destroy stuff to save RAM. (unless the deprecated `ast` option is on)
            options.format._destroy_ast = true;

            walk(toplevel, node => {
                if (node instanceof AST_Scope) {
                    node.variables = undefined;
                    node.enclosed = undefined;
                    node.parent_scope = undefined;
                }
                if (node.block_scope) {
                    node.block_scope.variables = undefined;
                    node.block_scope.enclosed = undefined;
                    node.parent_scope = undefined;
                }
            });
        }

        if (options.sourceMap) {
            if (options.sourceMap.includeSources && files instanceof AST_Toplevel) {
                throw new Error("original source content unavailable");
            }
            options.format.source_map = await SourceMap({
                file: options.sourceMap.filename,
                orig: options.sourceMap.content,
                root: options.sourceMap.root,
                files: options.sourceMap.includeSources ? files : null,
            });
        }
        delete options.format.ast;
        delete options.format.code;
        delete options.format.spidermonkey;
        var stream = OutputStream(options.format);
        toplevel.print(stream);
        result.code = stream.get();
        if (options.sourceMap) {
            Object.defineProperty(result, "map", {
                configurable: true,
                enumerable: true,
                get() {
                    const map = options.format.source_map.getEncoded();
                    return (result.map = options.sourceMap.asObject ? map : JSON.stringify(map));
                },
                set(value) {
                    Object.defineProperty(result, "map", {
                        value,
                        writable: true,
                    });
                }
            });
            result.decoded_map = options.format.source_map.getDecoded();
            if (options.sourceMap.url == "inline") {
                var sourceMap = typeof result.map === "object" ? JSON.stringify(result.map) : result.map;
                result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(sourceMap);
            } else if (options.sourceMap.url) {
                result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
            }
        }
    }
    if (options.nameCache && options.mangle) {
        if (options.mangle.cache) options.nameCache.vars = cache_to_json(options.mangle.cache);
        if (options.mangle.properties && options.mangle.properties.cache) {
            options.nameCache.props = cache_to_json(options.mangle.properties.cache);
        }
    }
    if (options.format && options.format.source_map) {
        options.format.source_map.destroy();
    }
    if (timings) {
        timings.end = Date.now();
        result.timings = {
            parse: 1e-3 * (timings.rename - timings.parse),
            rename: 1e-3 * (timings.compress - timings.rename),
            compress: 1e-3 * (timings.scope - timings.compress),
            scope: 1e-3 * (timings.mangle - timings.scope),
            mangle: 1e-3 * (timings.properties - timings.mangle),
            properties: 1e-3 * (timings.format - timings.properties),
            format: 1e-3 * (timings.end - timings.format),
            total: 1e-3 * (timings.end - timings.start)
        };
    }
    return result;
}

async function replaceAsync(str, regex, asyncFn) {
  const promises = [];

  str.replace(regex, (match, ...args) => {
    const promise = asyncFn(match, ...args);
    promises.push(promise);
  });

  const data = await Promise.all(promises);
  return str.replace(regex, () => data.shift());
}

/*!
 * HTML Parser By John Resig (ejohn.org)
 * Modified by Juriy "kangax" Zaytsev
 * Original code by Erik Arvidsson, Mozilla Public License
 * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
 */

class CaseInsensitiveSet extends Set {
  has(str) {
    return super.has(str.toLowerCase());
  }
}

// Regular Expressions for parsing tags and attributes
const singleAttrIdentifier = /([^\s"'<>/=]+)/;
const singleAttrAssigns = [/=/];
const singleAttrValues = [
  // attr value double quotes
  /"([^"]*)"+/.source,
  // attr value, single quotes
  /'([^']*)'+/.source,
  // attr value, no quotes
  /([^ \t\n\f\r"'`=<>]+)/.source
];
// https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
const qnameCapture = (function () {
  // based on https://www.npmjs.com/package/ncname
  const combiningChar = '\\u0300-\\u0345\\u0360\\u0361\\u0483-\\u0486\\u0591-\\u05A1\\u05A3-\\u05B9\\u05BB-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u064B-\\u0652\\u0670\\u06D6-\\u06E4\\u06E7\\u06E8\\u06EA-\\u06ED\\u0901-\\u0903\\u093C\\u093E-\\u094D\\u0951-\\u0954\\u0962\\u0963\\u0981-\\u0983\\u09BC\\u09BE-\\u09C4\\u09C7\\u09C8\\u09CB-\\u09CD\\u09D7\\u09E2\\u09E3\\u0A02\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A70\\u0A71\\u0A81-\\u0A83\\u0ABC\\u0ABE-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD\\u0B01-\\u0B03\\u0B3C\\u0B3E-\\u0B43\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B56\\u0B57\\u0B82\\u0B83\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD7\\u0C01-\\u0C03\\u0C3E-\\u0C44\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C82\\u0C83\\u0CBE-\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0D02\\u0D03\\u0D3E-\\u0D43\\u0D46-\\u0D48\\u0D4A-\\u0D4D\\u0D57\\u0E31\\u0E34-\\u0E3A\\u0E47-\\u0E4E\\u0EB1\\u0EB4-\\u0EB9\\u0EBB\\u0EBC\\u0EC8-\\u0ECD\\u0F18\\u0F19\\u0F35\\u0F37\\u0F39\\u0F3E\\u0F3F\\u0F71-\\u0F84\\u0F86-\\u0F8B\\u0F90-\\u0F95\\u0F97\\u0F99-\\u0FAD\\u0FB1-\\u0FB7\\u0FB9\\u20D0-\\u20DC\\u20E1\\u302A-\\u302F\\u3099\\u309A';
  const digit = '0-9\\u0660-\\u0669\\u06F0-\\u06F9\\u0966-\\u096F\\u09E6-\\u09EF\\u0A66-\\u0A6F\\u0AE6-\\u0AEF\\u0B66-\\u0B6F\\u0BE7-\\u0BEF\\u0C66-\\u0C6F\\u0CE6-\\u0CEF\\u0D66-\\u0D6F\\u0E50-\\u0E59\\u0ED0-\\u0ED9\\u0F20-\\u0F29';
  const extender = '\\xB7\\u02D0\\u02D1\\u0387\\u0640\\u0E46\\u0EC6\\u3005\\u3031-\\u3035\\u309D\\u309E\\u30FC-\\u30FE';
  const letter = 'A-Za-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u0131\\u0134-\\u013E\\u0141-\\u0148\\u014A-\\u017E\\u0180-\\u01C3\\u01CD-\\u01F0\\u01F4\\u01F5\\u01FA-\\u0217\\u0250-\\u02A8\\u02BB-\\u02C1\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03CE\\u03D0-\\u03D6\\u03DA\\u03DC\\u03DE\\u03E0\\u03E2-\\u03F3\\u0401-\\u040C\\u040E-\\u044F\\u0451-\\u045C\\u045E-\\u0481\\u0490-\\u04C4\\u04C7\\u04C8\\u04CB\\u04CC\\u04D0-\\u04EB\\u04EE-\\u04F5\\u04F8\\u04F9\\u0531-\\u0556\\u0559\\u0561-\\u0586\\u05D0-\\u05EA\\u05F0-\\u05F2\\u0621-\\u063A\\u0641-\\u064A\\u0671-\\u06B7\\u06BA-\\u06BE\\u06C0-\\u06CE\\u06D0-\\u06D3\\u06D5\\u06E5\\u06E6\\u0905-\\u0939\\u093D\\u0958-\\u0961\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8B\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AE0\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B36-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB5\\u0BB7-\\u0BB9\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C33\\u0C35-\\u0C39\\u0C60\\u0C61\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CDE\\u0CE0\\u0CE1\\u0D05-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D28\\u0D2A-\\u0D39\\u0D60\\u0D61\\u0E01-\\u0E2E\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E45\\u0E81\\u0E82\\u0E84\\u0E87\\u0E88\\u0E8A\\u0E8D\\u0E94-\\u0E97\\u0E99-\\u0E9F\\u0EA1-\\u0EA3\\u0EA5\\u0EA7\\u0EAA\\u0EAB\\u0EAD\\u0EAE\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0F40-\\u0F47\\u0F49-\\u0F69\\u10A0-\\u10C5\\u10D0-\\u10F6\\u1100\\u1102\\u1103\\u1105-\\u1107\\u1109\\u110B\\u110C\\u110E-\\u1112\\u113C\\u113E\\u1140\\u114C\\u114E\\u1150\\u1154\\u1155\\u1159\\u115F-\\u1161\\u1163\\u1165\\u1167\\u1169\\u116D\\u116E\\u1172\\u1173\\u1175\\u119E\\u11A8\\u11AB\\u11AE\\u11AF\\u11B7\\u11B8\\u11BA\\u11BC-\\u11C2\\u11EB\\u11F0\\u11F9\\u1E00-\\u1E9B\\u1EA0-\\u1EF9\\u1F00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2126\\u212A\\u212B\\u212E\\u2180-\\u2182\\u3007\\u3021-\\u3029\\u3041-\\u3094\\u30A1-\\u30FA\\u3105-\\u312C\\u4E00-\\u9FA5\\uAC00-\\uD7A3';
  const ncname = '[' + letter + '_][' + letter + digit + '\\.\\-_' + combiningChar + extender + ']*';
  return '((?:' + ncname + '\\:)?' + ncname + ')';
})();
const startTagOpen = new RegExp('^<' + qnameCapture);
const startTagClose = /^\s*(\/?)>/;
const endTag = new RegExp('^<\\/' + qnameCapture + '[^>]*>');
const doctype = /^<!DOCTYPE\s?[^>]+>/i;

let IS_REGEX_CAPTURING_BROKEN = false;
'x'.replace(/x(.)?/g, function (m, g) {
  IS_REGEX_CAPTURING_BROKEN = g === '';
});

// Empty Elements
const empty = new CaseInsensitiveSet(['area', 'base', 'basefont', 'br', 'col', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr']);

// Inline Elements
const inline = new CaseInsensitiveSet(['a', 'abbr', 'acronym', 'applet', 'b', 'basefont', 'bdo', 'big', 'br', 'button', 'cite', 'code', 'del', 'dfn', 'em', 'font', 'i', 'iframe', 'img', 'input', 'ins', 'kbd', 'label', 'map', 'noscript', 'object', 'q', 's', 'samp', 'script', 'select', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'svg', 'textarea', 'tt', 'u', 'var']);

// Elements that you can, intentionally, leave open
// (and which close themselves)
const closeSelf = new CaseInsensitiveSet(['colgroup', 'dd', 'dt', 'li', 'option', 'p', 'td', 'tfoot', 'th', 'thead', 'tr', 'source']);

// Attributes that have their values filled in disabled='disabled'
const fillAttrs = new CaseInsensitiveSet(['checked', 'compact', 'declare', 'defer', 'disabled', 'ismap', 'multiple', 'nohref', 'noresize', 'noshade', 'nowrap', 'readonly', 'selected']);

// Special Elements (can contain anything)
const special = new CaseInsensitiveSet(['script', 'style']);

// HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
// Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
const nonPhrasing = new CaseInsensitiveSet(['address', 'article', 'aside', 'base', 'blockquote', 'body', 'caption', 'col', 'colgroup', 'dd', 'details', 'dialog', 'div', 'dl', 'dt', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'legend', 'li', 'menuitem', 'meta', 'ol', 'optgroup', 'option', 'param', 'rp', 'rt', 'source', 'style', 'summary', 'tbody', 'td', 'tfoot', 'th', 'thead', 'title', 'tr', 'track', 'ul']);

const reCache = {};

function attrForHandler(handler) {
  let pattern = singleAttrIdentifier.source +
    '(?:\\s*(' + joinSingleAttrAssigns(handler) + ')' +
    '[ \\t\\n\\f\\r]*(?:' + singleAttrValues.join('|') + '))?';
  if (handler.customAttrSurround) {
    const attrClauses = [];
    for (let i = handler.customAttrSurround.length - 1; i >= 0; i--) {
      attrClauses[i] = '(?:' +
        '(' + handler.customAttrSurround[i][0].source + ')\\s*' +
        pattern +
        '\\s*(' + handler.customAttrSurround[i][1].source + ')' +
        ')';
    }
    attrClauses.push('(?:' + pattern + ')');
    pattern = '(?:' + attrClauses.join('|') + ')';
  }
  return new RegExp('^\\s*' + pattern);
}

function joinSingleAttrAssigns(handler) {
  return singleAttrAssigns.concat(
    handler.customAttrAssign || []
  ).map(function (assign) {
    return '(?:' + assign.source + ')';
  }).join('|');
}

class HTMLParser {
  constructor(html, handler) {
    this.html = html;
    this.handler = handler;
  }

  async parse() {
    let html = this.html;
    const handler = this.handler;

    const stack = []; let lastTag;
    const attribute = attrForHandler(handler);
    let last, prevTag, nextTag;
    while (html) {
      last = html;
      // Make sure we're not in a script or style element
      if (!lastTag || !special.has(lastTag)) {
        let textEnd = html.indexOf('<');
        if (textEnd === 0) {
          // Comment:
          if (/^<!--/.test(html)) {
            const commentEnd = html.indexOf('-->');

            if (commentEnd >= 0) {
              if (handler.comment) {
                await handler.comment(html.substring(4, commentEnd));
              }
              html = html.substring(commentEnd + 3);
              prevTag = '';
              continue;
            }
          }

          // https://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
          if (/^<!\[/.test(html)) {
            const conditionalEnd = html.indexOf(']>');

            if (conditionalEnd >= 0) {
              if (handler.comment) {
                await handler.comment(html.substring(2, conditionalEnd + 1), true /* non-standard */);
              }
              html = html.substring(conditionalEnd + 2);
              prevTag = '';
              continue;
            }
          }

          // Doctype:
          const doctypeMatch = html.match(doctype);
          if (doctypeMatch) {
            if (handler.doctype) {
              handler.doctype(doctypeMatch[0]);
            }
            html = html.substring(doctypeMatch[0].length);
            prevTag = '';
            continue;
          }

          // End tag:
          const endTagMatch = html.match(endTag);
          if (endTagMatch) {
            html = html.substring(endTagMatch[0].length);
            await replaceAsync(endTagMatch[0], endTag, parseEndTag);
            prevTag = '/' + endTagMatch[1].toLowerCase();
            continue;
          }

          // Start tag:
          const startTagMatch = parseStartTag(html);
          if (startTagMatch) {
            html = startTagMatch.rest;
            await handleStartTag(startTagMatch);
            prevTag = startTagMatch.tagName.toLowerCase();
            continue;
          }

          // Treat `<` as text
          if (handler.continueOnParseError) {
            textEnd = html.indexOf('<', 1);
          }
        }

        let text;
        if (textEnd >= 0) {
          text = html.substring(0, textEnd);
          html = html.substring(textEnd);
        } else {
          text = html;
          html = '';
        }

        // next tag
        let nextTagMatch = parseStartTag(html);
        if (nextTagMatch) {
          nextTag = nextTagMatch.tagName;
        } else {
          nextTagMatch = html.match(endTag);
          if (nextTagMatch) {
            nextTag = '/' + nextTagMatch[1];
          } else {
            nextTag = '';
          }
        }

        if (handler.chars) {
          await handler.chars(text, prevTag, nextTag);
        }
        prevTag = '';
      } else {
        const stackedTag = lastTag.toLowerCase();
        const reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)</' + stackedTag + '[^>]*>', 'i'));

        html = await replaceAsync(html, reStackedTag, async (_, text) => {
          if (stackedTag !== 'script' && stackedTag !== 'style' && stackedTag !== 'noscript') {
            text = text
              .replace(/<!--([\s\S]*?)-->/g, '$1')
              .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
          }

          if (handler.chars) {
            await handler.chars(text);
          }

          return '';
        });

        await parseEndTag('</' + stackedTag + '>', stackedTag);
      }

      if (html === last) {
        throw new Error('Parse Error: ' + html);
      }
    }

    if (!handler.partialMarkup) {
      // Clean up any remaining tags
      await parseEndTag();
    }

    function parseStartTag(input) {
      const start = input.match(startTagOpen);
      if (start) {
        const match = {
          tagName: start[1],
          attrs: []
        };
        input = input.slice(start[0].length);
        let end, attr;
        while (!(end = input.match(startTagClose)) && (attr = input.match(attribute))) {
          input = input.slice(attr[0].length);
          match.attrs.push(attr);
        }
        if (end) {
          match.unarySlash = end[1];
          match.rest = input.slice(end[0].length);
          return match;
        }
      }
    }

    async function closeIfFound(tagName) {
      if (findTag(tagName) >= 0) {
        await parseEndTag('', tagName);
        return true;
      }
    }

    async function handleStartTag(match) {
      const tagName = match.tagName;
      let unarySlash = match.unarySlash;

      if (handler.html5) {
        if (lastTag === 'p' && nonPhrasing.has(tagName)) {
          await parseEndTag('', lastTag);
        } else if (tagName === 'tbody') {
          await closeIfFound('thead');
        } else if (tagName === 'tfoot') {
          if (!await closeIfFound('tbody')) {
            await closeIfFound('thead');
          }
        }
        if (tagName === 'col' && findTag('colgroup') < 0) {
          lastTag = 'colgroup';
          stack.push({ tag: lastTag, attrs: [] });
          if (handler.start) {
            await handler.start(lastTag, [], false, '');
          }
        }
      }

      if (!handler.html5 && !inline.has(tagName)) {
        while (lastTag && inline.has(lastTag)) {
          await parseEndTag('', lastTag);
        }
      }

      if (closeSelf.has(tagName) && lastTag === tagName) {
        await parseEndTag('', tagName);
      }

      const unary = empty.has(tagName) || (tagName === 'html' && lastTag === 'head') || !!unarySlash;

      const attrs = match.attrs.map(function (args) {
        let name, value, customOpen, customClose, customAssign, quote;
        const ncp = 7; // number of captured parts, scalar

        // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
        if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
          if (args[3] === '') { delete args[3]; }
          if (args[4] === '') { delete args[4]; }
          if (args[5] === '') { delete args[5]; }
        }

        function populate(index) {
          customAssign = args[index];
          value = args[index + 1];
          if (typeof value !== 'undefined') {
            return '"';
          }
          value = args[index + 2];
          if (typeof value !== 'undefined') {
            return '\'';
          }
          value = args[index + 3];
          if (typeof value === 'undefined' && fillAttrs.has(name)) {
            value = name;
          }
          return '';
        }

        let j = 1;
        if (handler.customAttrSurround) {
          for (let i = 0, l = handler.customAttrSurround.length; i < l; i++, j += ncp) {
            name = args[j + 1];
            if (name) {
              quote = populate(j + 2);
              customOpen = args[j];
              customClose = args[j + 6];
              break;
            }
          }
        }

        if (!name && (name = args[j])) {
          quote = populate(j + 1);
        }

        return {
          name,
          value,
          customAssign: customAssign || '=',
          customOpen: customOpen || '',
          customClose: customClose || '',
          quote: quote || ''
        };
      });

      if (!unary) {
        stack.push({ tag: tagName, attrs });
        lastTag = tagName;
        unarySlash = '';
      }

      if (handler.start) {
        await handler.start(tagName, attrs, unary, unarySlash);
      }
    }

    function findTag(tagName) {
      let pos;
      const needle = tagName.toLowerCase();
      for (pos = stack.length - 1; pos >= 0; pos--) {
        if (stack[pos].tag.toLowerCase() === needle) {
          break;
        }
      }
      return pos;
    }

    async function parseEndTag(tag, tagName) {
      let pos;

      // Find the closest opened tag of the same type
      if (tagName) {
        pos = findTag(tagName);
      } else { // If no tag name is provided, clean shop
        pos = 0;
      }

      if (pos >= 0) {
        // Close all the open elements, up the stack
        for (let i = stack.length - 1; i >= pos; i--) {
          if (handler.end) {
            handler.end(stack[i].tag, stack[i].attrs, i > pos || !tag);
          }
        }

        // Remove the open elements from the stack
        stack.length = pos;
        lastTag = pos && stack[pos - 1].tag;
      } else if (tagName.toLowerCase() === 'br') {
        if (handler.start) {
          await handler.start(tagName, [], true, '');
        }
      } else if (tagName.toLowerCase() === 'p') {
        if (handler.start) {
          await handler.start(tagName, [], false, '', true);
        }
        if (handler.end) {
          handler.end(tagName, []);
        }
      }
    }
  }
}

class Sorter {
  sort(tokens, fromIndex = 0) {
    for (let i = 0, len = this.keys.length; i < len; i++) {
      const key = this.keys[i];
      const token = key.slice(1);

      let index = tokens.indexOf(token, fromIndex);

      if (index !== -1) {
        do {
          if (index !== fromIndex) {
            tokens.splice(index, 1);
            tokens.splice(fromIndex, 0, token);
          }
          fromIndex++;
        } while ((index = tokens.indexOf(token, fromIndex)) !== -1);

        return this[key].sort(tokens, fromIndex);
      }
    }
    return tokens;
  }
}

class TokenChain {
  add(tokens) {
    tokens.forEach((token) => {
      const key = '$' + token;
      if (!this[key]) {
        this[key] = [];
        this[key].processed = 0;
      }
      this[key].push(tokens);
    });
  }

  createSorter() {
    const sorter = new Sorter();

    sorter.keys = Object.keys(this).sort((j, k) => {
      const m = this[j].length;
      const n = this[k].length;
      return m < n ? 1 : m > n ? -1 : j < k ? -1 : j > k ? 1 : 0;
    }).filter((key) => {
      if (this[key].processed < this[key].length) {
        const token = key.slice(1);
        const chain = new TokenChain();

        this[key].forEach((tokens) => {
          let index;
          while ((index = tokens.indexOf(token)) !== -1) {
            tokens.splice(index, 1);
          }
          tokens.forEach((token) => {
            this['$' + token].processed++;
          });
          chain.add(tokens.slice(0));
        });
        sorter[key] = chain.createSorter();
        return true;
      }
      return false;
    });
    return sorter;
  }
}

function trimWhitespace(str) {
  return str && str.replace(/^[ \n\r\t\f]+/, '').replace(/[ \n\r\t\f]+$/, '');
}

function collapseWhitespaceAll(str) {
  // Non-breaking space is specifically handled inside the replacer function here:
  return str && str.replace(/[ \n\r\t\f\xA0]+/g, function (spaces) {
    return spaces === '\t' ? '\t' : spaces.replace(/(^|\xA0+)[^\xA0]+/g, '$1 ');
  });
}

function collapseWhitespace(str, options, trimLeft, trimRight, collapseAll) {
  let lineBreakBefore = ''; let lineBreakAfter = '';

  if (options.preserveLineBreaks) {
    str = str.replace(/^[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*/, function () {
      lineBreakBefore = '\n';
      return '';
    }).replace(/[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*$/, function () {
      lineBreakAfter = '\n';
      return '';
    });
  }

  if (trimLeft) {
    // Non-breaking space is specifically handled inside the replacer function here:
    str = str.replace(/^[ \n\r\t\f\xA0]+/, function (spaces) {
      const conservative = !lineBreakBefore && options.conservativeCollapse;
      if (conservative && spaces === '\t') {
        return '\t';
      }
      return spaces.replace(/^[^\xA0]+/, '').replace(/(\xA0+)[^\xA0]+/g, '$1 ') || (conservative ? ' ' : '');
    });
  }

  if (trimRight) {
    // Non-breaking space is specifically handled inside the replacer function here:
    str = str.replace(/[ \n\r\t\f\xA0]+$/, function (spaces) {
      const conservative = !lineBreakAfter && options.conservativeCollapse;
      if (conservative && spaces === '\t') {
        return '\t';
      }
      return spaces.replace(/[^\xA0]+(\xA0+)/g, ' $1').replace(/[^\xA0]+$/, '') || (conservative ? ' ' : '');
    });
  }

  if (collapseAll) {
    // strip non space whitespace then compress spaces to one
    str = collapseWhitespaceAll(str);
  }

  return lineBreakBefore + str + lineBreakAfter;
}

// non-empty tags that will maintain whitespace around them
const inlineTags = new Set(['a', 'abbr', 'acronym', 'b', 'bdi', 'bdo', 'big', 'button', 'cite', 'code', 'del', 'dfn', 'em', 'font', 'i', 'ins', 'kbd', 'label', 'mark', 'math', 'nobr', 'object', 'q', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'select', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'svg', 'textarea', 'time', 'tt', 'u', 'var']);
// non-empty tags that will maintain whitespace within them
const inlineTextTags = new Set(['a', 'abbr', 'acronym', 'b', 'big', 'del', 'em', 'font', 'i', 'ins', 'kbd', 'mark', 'nobr', 'rp', 's', 'samp', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'time', 'tt', 'u', 'var']);
// self-closing tags that will maintain whitespace around them
const selfClosingInlineTags = new Set(['comment', 'img', 'input', 'wbr']);

function collapseWhitespaceSmart(str, prevTag, nextTag, options) {
  let trimLeft = prevTag && !selfClosingInlineTags.has(prevTag);
  if (trimLeft && !options.collapseInlineTagWhitespace) {
    trimLeft = prevTag.charAt(0) === '/' ? !inlineTags.has(prevTag.slice(1)) : !inlineTextTags.has(prevTag);
  }
  let trimRight = nextTag && !selfClosingInlineTags.has(nextTag);
  if (trimRight && !options.collapseInlineTagWhitespace) {
    trimRight = nextTag.charAt(0) === '/' ? !inlineTextTags.has(nextTag.slice(1)) : !inlineTags.has(nextTag);
  }
  return collapseWhitespace(str, options, trimLeft, trimRight, prevTag && nextTag);
}

function isConditionalComment(text) {
  return /^\[if\s[^\]]+]|\[endif]$/.test(text);
}

function isIgnoredComment(text, options) {
  for (let i = 0, len = options.ignoreCustomComments.length; i < len; i++) {
    if (options.ignoreCustomComments[i].test(text)) {
      return true;
    }
  }
  return false;
}

function isEventAttribute(attrName, options) {
  const patterns = options.customEventAttributes;
  if (patterns) {
    for (let i = patterns.length; i--;) {
      if (patterns[i].test(attrName)) {
        return true;
      }
    }
    return false;
  }
  return /^on[a-z]{3,}$/.test(attrName);
}

function canRemoveAttributeQuotes(value) {
  // https://mathiasbynens.be/notes/unquoted-attribute-values
  return /^[^ \t\n\f\r"'`=<>]+$/.test(value);
}

function attributesInclude(attributes, attribute) {
  for (let i = attributes.length; i--;) {
    if (attributes[i].name.toLowerCase() === attribute) {
      return true;
    }
  }
  return false;
}

function isAttributeRedundant(tag, attrName, attrValue, attrs) {
  attrValue = attrValue ? trimWhitespace(attrValue.toLowerCase()) : '';

  return (
    (tag === 'script' &&
      attrName === 'language' &&
      attrValue === 'javascript') ||

    (tag === 'form' &&
      attrName === 'method' &&
      attrValue === 'get') ||

    (tag === 'input' &&
      attrName === 'type' &&
      attrValue === 'text') ||

    (tag === 'script' &&
      attrName === 'charset' &&
      !attributesInclude(attrs, 'src')) ||

    (tag === 'a' &&
      attrName === 'name' &&
      attributesInclude(attrs, 'id')) ||

    (tag === 'area' &&
      attrName === 'shape' &&
      attrValue === 'rect')
  );
}

// https://mathiasbynens.be/demo/javascript-mime-type
// https://developer.mozilla.org/en/docs/Web/HTML/Element/script#attr-type
const executableScriptsMimetypes = new Set([
  'text/javascript',
  'text/ecmascript',
  'text/jscript',
  'application/javascript',
  'application/x-javascript',
  'application/ecmascript',
  'module'
]);

const keepScriptsMimetypes = new Set([
  'module'
]);

function isScriptTypeAttribute(attrValue = '') {
  attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
  return attrValue === '' || executableScriptsMimetypes.has(attrValue);
}

function keepScriptTypeAttribute(attrValue = '') {
  attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
  return keepScriptsMimetypes.has(attrValue);
}

function isExecutableScript(tag, attrs) {
  if (tag !== 'script') {
    return false;
  }
  for (let i = 0, len = attrs.length; i < len; i++) {
    const attrName = attrs[i].name.toLowerCase();
    if (attrName === 'type') {
      return isScriptTypeAttribute(attrs[i].value);
    }
  }
  return true;
}

function isStyleLinkTypeAttribute(attrValue = '') {
  attrValue = trimWhitespace(attrValue).toLowerCase();
  return attrValue === '' || attrValue === 'text/css';
}

function isStyleSheet(tag, attrs) {
  if (tag !== 'style') {
    return false;
  }
  for (let i = 0, len = attrs.length; i < len; i++) {
    const attrName = attrs[i].name.toLowerCase();
    if (attrName === 'type') {
      return isStyleLinkTypeAttribute(attrs[i].value);
    }
  }
  return true;
}

const isSimpleBoolean = new Set(['allowfullscreen', 'async', 'autofocus', 'autoplay', 'checked', 'compact', 'controls', 'declare', 'default', 'defaultchecked', 'defaultmuted', 'defaultselected', 'defer', 'disabled', 'enabled', 'formnovalidate', 'hidden', 'indeterminate', 'inert', 'ismap', 'itemscope', 'loop', 'multiple', 'muted', 'nohref', 'noresize', 'noshade', 'novalidate', 'nowrap', 'open', 'pauseonexit', 'readonly', 'required', 'reversed', 'scoped', 'seamless', 'selected', 'sortable', 'truespeed', 'typemustmatch', 'visible']);
const isBooleanValue = new Set(['true', 'false']);

function isBooleanAttribute(attrName, attrValue) {
  return isSimpleBoolean.has(attrName) || (attrName === 'draggable' && !isBooleanValue.has(attrValue));
}

function isUriTypeAttribute(attrName, tag) {
  return (
    (/^(?:a|area|link|base)$/.test(tag) && attrName === 'href') ||
    (tag === 'img' && /^(?:src|longdesc|usemap)$/.test(attrName)) ||
    (tag === 'object' && /^(?:classid|codebase|data|usemap)$/.test(attrName)) ||
    (tag === 'q' && attrName === 'cite') ||
    (tag === 'blockquote' && attrName === 'cite') ||
    ((tag === 'ins' || tag === 'del') && attrName === 'cite') ||
    (tag === 'form' && attrName === 'action') ||
    (tag === 'input' && (attrName === 'src' || attrName === 'usemap')) ||
    (tag === 'head' && attrName === 'profile') ||
    (tag === 'script' && (attrName === 'src' || attrName === 'for'))
  );
}

function isNumberTypeAttribute(attrName, tag) {
  return (
    (/^(?:a|area|object|button)$/.test(tag) && attrName === 'tabindex') ||
    (tag === 'input' && (attrName === 'maxlength' || attrName === 'tabindex')) ||
    (tag === 'select' && (attrName === 'size' || attrName === 'tabindex')) ||
    (tag === 'textarea' && /^(?:rows|cols|tabindex)$/.test(attrName)) ||
    (tag === 'colgroup' && attrName === 'span') ||
    (tag === 'col' && attrName === 'span') ||
    ((tag === 'th' || tag === 'td') && (attrName === 'rowspan' || attrName === 'colspan'))
  );
}

function isLinkType(tag, attrs, value) {
  if (tag !== 'link') {
    return false;
  }
  for (let i = 0, len = attrs.length; i < len; i++) {
    if (attrs[i].name === 'rel' && attrs[i].value === value) {
      return true;
    }
  }
}

function isMediaQuery(tag, attrs, attrName) {
  return attrName === 'media' && (isLinkType(tag, attrs, 'stylesheet') || isStyleSheet(tag, attrs));
}

const srcsetTags = new Set(['img', 'source']);

function isSrcset(attrName, tag) {
  return attrName === 'srcset' && srcsetTags.has(tag);
}

async function cleanAttributeValue(tag, attrName, attrValue, options, attrs) {
  if (isEventAttribute(attrName, options)) {
    attrValue = trimWhitespace(attrValue).replace(/^javascript:\s*/i, '');
    return options.minifyJS(attrValue, true);
  } else if (attrName === 'class') {
    attrValue = trimWhitespace(attrValue);
    if (options.sortClassName) {
      attrValue = options.sortClassName(attrValue);
    } else {
      attrValue = collapseWhitespaceAll(attrValue);
    }
    return attrValue;
  } else if (isUriTypeAttribute(attrName, tag)) {
    attrValue = trimWhitespace(attrValue);
    return isLinkType(tag, attrs, 'canonical') ? attrValue : options.minifyURLs(attrValue);
  } else if (isNumberTypeAttribute(attrName, tag)) {
    return trimWhitespace(attrValue);
  } else if (attrName === 'style') {
    attrValue = trimWhitespace(attrValue);
    if (attrValue) {
      if (/;$/.test(attrValue) && !/&#?[0-9a-zA-Z]+;$/.test(attrValue)) {
        attrValue = attrValue.replace(/\s*;$/, ';');
      }
      attrValue = await options.minifyCSS(attrValue, 'inline');
    }
    return attrValue;
  } else if (isSrcset(attrName, tag)) {
    // https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-srcset
    attrValue = trimWhitespace(attrValue).split(/\s+,\s*|\s*,\s+/).map(function (candidate) {
      let url = candidate;
      let descriptor = '';
      const match = candidate.match(/\s+([1-9][0-9]*w|[0-9]+(?:\.[0-9]+)?x)$/);
      if (match) {
        url = url.slice(0, -match[0].length);
        const num = +match[1].slice(0, -1);
        const suffix = match[1].slice(-1);
        if (num !== 1 || suffix !== 'x') {
          descriptor = ' ' + num + suffix;
        }
      }
      return options.minifyURLs(url) + descriptor;
    }).join(', ');
  } else if (isMetaViewport(tag, attrs) && attrName === 'content') {
    attrValue = attrValue.replace(/\s+/g, '').replace(/[0-9]+\.[0-9]+/g, function (numString) {
      // "0.90000" -> "0.9"
      // "1.0" -> "1"
      // "1.0001" -> "1.0001" (unchanged)
      return (+numString).toString();
    });
  } else if (isContentSecurityPolicy(tag, attrs) && attrName.toLowerCase() === 'content') {
    return collapseWhitespaceAll(attrValue);
  } else if (options.customAttrCollapse && options.customAttrCollapse.test(attrName)) {
    attrValue = trimWhitespace(attrValue.replace(/ ?[\n\r]+ ?/g, '').replace(/\s{2,}/g, options.conservativeCollapse ? ' ' : ''));
  } else if (tag === 'script' && attrName === 'type') {
    attrValue = trimWhitespace(attrValue.replace(/\s*;\s*/g, ';'));
  } else if (isMediaQuery(tag, attrs, attrName)) {
    attrValue = trimWhitespace(attrValue);
    return options.minifyCSS(attrValue, 'media');
  }
  return attrValue;
}

function isMetaViewport(tag, attrs) {
  if (tag !== 'meta') {
    return false;
  }
  for (let i = 0, len = attrs.length; i < len; i++) {
    if (attrs[i].name === 'name' && attrs[i].value === 'viewport') {
      return true;
    }
  }
}

function isContentSecurityPolicy(tag, attrs) {
  if (tag !== 'meta') {
    return false;
  }
  for (let i = 0, len = attrs.length; i < len; i++) {
    if (attrs[i].name.toLowerCase() === 'http-equiv' && attrs[i].value.toLowerCase() === 'content-security-policy') {
      return true;
    }
  }
}

function ignoreCSS(id) {
  return '/* clean-css ignore:start */' + id + '/* clean-css ignore:end */';
}

// Wrap CSS declarations for CleanCSS > 3.x
// See https://github.com/jakubpawlowicz/clean-css/issues/418
function wrapCSS(text, type) {
  switch (type) {
    case 'inline':
      return '*{' + text + '}';
    case 'media':
      return '@media ' + text + '{a{top:0}}';
    default:
      return text;
  }
}

function unwrapCSS(text, type) {
  let matches;
  switch (type) {
    case 'inline':
      matches = text.match(/^\*\{([\s\S]*)\}$/);
      break;
    case 'media':
      matches = text.match(/^@media ([\s\S]*?)\s*{[\s\S]*}$/);
      break;
  }
  return matches ? matches[1] : text;
}

async function cleanConditionalComment(comment, options) {
  return options.processConditionalComments
    ? await replaceAsync(comment, /^(\[if\s[^\]]+]>)([\s\S]*?)(<!\[endif])$/, async function (match, prefix, text, suffix) {
      return prefix + await minifyHTML(text, options, true) + suffix;
    })
    : comment;
}

async function processScript(text, options, currentAttrs) {
  for (let i = 0, len = currentAttrs.length; i < len; i++) {
    if (currentAttrs[i].name.toLowerCase() === 'type' &&
      options.processScripts.indexOf(currentAttrs[i].value) > -1) {
      return await minifyHTML(text, options);
    }
  }
  return text;
}

// Tag omission rules from https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
// with the following deviations:
// - retain <body> if followed by <noscript>
// - </rb>, </rt>, </rtc>, </rp> & </tfoot> follow https://www.w3.org/TR/html5/syntax.html#optional-tags
// - retain all tags which are adjacent to non-standard HTML tags
const optionalStartTags = new Set(['html', 'head', 'body', 'colgroup', 'tbody']);
const optionalEndTags = new Set(['html', 'head', 'body', 'li', 'dt', 'dd', 'p', 'rb', 'rt', 'rtc', 'rp', 'optgroup', 'option', 'colgroup', 'caption', 'thead', 'tbody', 'tfoot', 'tr', 'td', 'th']);
const headerTags = new Set(['meta', 'link', 'script', 'style', 'template', 'noscript']);
const descriptionTags = new Set(['dt', 'dd']);
const pBlockTags = new Set(['address', 'article', 'aside', 'blockquote', 'details', 'div', 'dl', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'main', 'menu', 'nav', 'ol', 'p', 'pre', 'section', 'table', 'ul']);
const pInlineTags = new Set(['a', 'audio', 'del', 'ins', 'map', 'noscript', 'video']);
const rubyTags = new Set(['rb', 'rt', 'rtc', 'rp']);
const rtcTag = new Set(['rb', 'rtc', 'rp']);
const optionTag = new Set(['option', 'optgroup']);
const tableContentTags = new Set(['tbody', 'tfoot']);
const tableSectionTags = new Set(['thead', 'tbody', 'tfoot']);
const cellTags = new Set(['td', 'th']);
const topLevelTags = new Set(['html', 'head', 'body']);
const compactTags = new Set(['html', 'body']);
const looseTags = new Set(['head', 'colgroup', 'caption']);
const trailingTags = new Set(['dt', 'thead']);
const htmlTags = new Set(['a', 'abbr', 'acronym', 'address', 'applet', 'area', 'article', 'aside', 'audio', 'b', 'base', 'basefont', 'bdi', 'bdo', 'bgsound', 'big', 'blink', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'command', 'content', 'data', 'datalist', 'dd', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'element', 'em', 'embed', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'iframe', 'image', 'img', 'input', 'ins', 'isindex', 'kbd', 'keygen', 'label', 'legend', 'li', 'link', 'listing', 'main', 'map', 'mark', 'marquee', 'menu', 'menuitem', 'meta', 'meter', 'multicol', 'nav', 'nobr', 'noembed', 'noframes', 'noscript', 'object', 'ol', 'optgroup', 'option', 'output', 'p', 'param', 'picture', 'plaintext', 'pre', 'progress', 'q', 'rb', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'script', 'section', 'select', 'shadow', 'small', 'source', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'template', 'textarea', 'tfoot', 'th', 'thead', 'time', 'title', 'tr', 'track', 'tt', 'u', 'ul', 'var', 'video', 'wbr', 'xmp']);

function canRemoveParentTag(optionalStartTag, tag) {
  switch (optionalStartTag) {
    case 'html':
    case 'head':
      return true;
    case 'body':
      return !headerTags.has(tag);
    case 'colgroup':
      return tag === 'col';
    case 'tbody':
      return tag === 'tr';
  }
  return false;
}

function isStartTagMandatory(optionalEndTag, tag) {
  switch (tag) {
    case 'colgroup':
      return optionalEndTag === 'colgroup';
    case 'tbody':
      return tableSectionTags.has(optionalEndTag);
  }
  return false;
}

function canRemovePrecedingTag(optionalEndTag, tag) {
  switch (optionalEndTag) {
    case 'html':
    case 'head':
    case 'body':
    case 'colgroup':
    case 'caption':
      return true;
    case 'li':
    case 'optgroup':
    case 'tr':
      return tag === optionalEndTag;
    case 'dt':
    case 'dd':
      return descriptionTags.has(tag);
    case 'p':
      return pBlockTags.has(tag);
    case 'rb':
    case 'rt':
    case 'rp':
      return rubyTags.has(tag);
    case 'rtc':
      return rtcTag.has(tag);
    case 'option':
      return optionTag.has(tag);
    case 'thead':
    case 'tbody':
      return tableContentTags.has(tag);
    case 'tfoot':
      return tag === 'tbody';
    case 'td':
    case 'th':
      return cellTags.has(tag);
  }
  return false;
}

const reEmptyAttribute = new RegExp(
  '^(?:class|id|style|title|lang|dir|on(?:focus|blur|change|click|dblclick|mouse(' +
  '?:down|up|over|move|out)|key(?:press|down|up)))$');

function canDeleteEmptyAttribute(tag, attrName, attrValue, options) {
  const isValueEmpty = !attrValue || /^\s*$/.test(attrValue);
  if (!isValueEmpty) {
    return false;
  }
  if (typeof options.removeEmptyAttributes === 'function') {
    return options.removeEmptyAttributes(attrName, tag);
  }
  return (tag === 'input' && attrName === 'value') || reEmptyAttribute.test(attrName);
}

function hasAttrName(name, attrs) {
  for (let i = attrs.length - 1; i >= 0; i--) {
    if (attrs[i].name === name) {
      return true;
    }
  }
  return false;
}

function canRemoveElement(tag, attrs) {
  switch (tag) {
    case 'textarea':
      return false;
    case 'audio':
    case 'script':
    case 'video':
      if (hasAttrName('src', attrs)) {
        return false;
      }
      break;
    case 'iframe':
      if (hasAttrName('src', attrs) || hasAttrName('srcdoc', attrs)) {
        return false;
      }
      break;
    case 'object':
      if (hasAttrName('data', attrs)) {
        return false;
      }
      break;
    case 'applet':
      if (hasAttrName('code', attrs)) {
        return false;
      }
      break;
  }
  return true;
}

function canCollapseWhitespace(tag) {
  return !/^(?:script|style|pre|textarea)$/.test(tag);
}

function canTrimWhitespace(tag) {
  return !/^(?:pre|textarea)$/.test(tag);
}

async function normalizeAttr(attr, attrs, tag, options) {
  const attrName = options.name(attr.name);
  let attrValue = attr.value;

  if (options.decodeEntities && attrValue) {
    attrValue = decodeHTMLStrict(attrValue);
  }

  if ((options.removeRedundantAttributes &&
    isAttributeRedundant(tag, attrName, attrValue, attrs)) ||
    (options.removeScriptTypeAttributes && tag === 'script' &&
      attrName === 'type' && isScriptTypeAttribute(attrValue) && !keepScriptTypeAttribute(attrValue)) ||
    (options.removeStyleLinkTypeAttributes && (tag === 'style' || tag === 'link') &&
      attrName === 'type' && isStyleLinkTypeAttribute(attrValue))) {
    return;
  }

  if (attrValue) {
    attrValue = await cleanAttributeValue(tag, attrName, attrValue, options, attrs);
  }

  if (options.removeEmptyAttributes &&
    canDeleteEmptyAttribute(tag, attrName, attrValue, options)) {
    return;
  }

  if (options.decodeEntities && attrValue) {
    attrValue = attrValue.replace(/&(#?[0-9a-zA-Z]+;)/g, '&amp;$1');
  }

  return {
    attr,
    name: attrName,
    value: attrValue
  };
}

function buildAttr(normalized, hasUnarySlash, options, isLast, uidAttr) {
  const attrName = normalized.name;
  let attrValue = normalized.value;
  const attr = normalized.attr;
  let attrQuote = attr.quote;
  let attrFragment;
  let emittedAttrValue;

  if (typeof attrValue !== 'undefined' && (!options.removeAttributeQuotes ||
    ~attrValue.indexOf(uidAttr) || !canRemoveAttributeQuotes(attrValue))) {
    if (!options.preventAttributesEscaping) {
      if (typeof options.quoteCharacter === 'undefined') {
        const apos = (attrValue.match(/'/g) || []).length;
        const quot = (attrValue.match(/"/g) || []).length;
        attrQuote = apos < quot ? '\'' : '"';
      } else {
        attrQuote = options.quoteCharacter === '\'' ? '\'' : '"';
      }
      if (attrQuote === '"') {
        attrValue = attrValue.replace(/"/g, '&#34;');
      } else {
        attrValue = attrValue.replace(/'/g, '&#39;');
      }
    }
    emittedAttrValue = attrQuote + attrValue + attrQuote;
    if (!isLast && !options.removeTagWhitespace) {
      emittedAttrValue += ' ';
    }
  } else if (isLast && !hasUnarySlash && !/\/$/.test(attrValue)) {
    // make sure trailing slash is not interpreted as HTML self-closing tag
    emittedAttrValue = attrValue;
  } else {
    emittedAttrValue = attrValue + ' ';
  }

  if (typeof attrValue === 'undefined' || (options.collapseBooleanAttributes &&
    isBooleanAttribute(attrName.toLowerCase(), attrValue.toLowerCase()))) {
    attrFragment = attrName;
    if (!isLast) {
      attrFragment += ' ';
    }
  } else {
    attrFragment = attrName + attr.customAssign + emittedAttrValue;
  }

  return attr.customOpen + attrFragment + attr.customClose;
}

function identity(value) {
  return value;
}

function identityAsync(value) {
  return Promise.resolve(value);
}

const processOptions = (inputOptions) => {
  const options = {
    name: function (name) {
      return name.toLowerCase();
    },
    canCollapseWhitespace,
    canTrimWhitespace,
    html5: true,
    ignoreCustomComments: [
      /^!/,
      /^\s*#/
    ],
    ignoreCustomFragments: [
      /<%[\s\S]*?%>/,
      /<\?[\s\S]*?\?>/
    ],
    includeAutoGeneratedTags: true,
    log: identity,
    minifyCSS: identityAsync,
    minifyJS: identity,
    minifyURLs: identity
  };

  Object.keys(inputOptions).forEach(function (key) {
    const option = inputOptions[key];

    if (key === 'caseSensitive') {
      if (option) {
        options.name = identity;
      }
    } else if (key === 'log') {
      if (typeof option === 'function') {
        options.log = option;
      }
    } else if (key === 'minifyCSS' && typeof option !== 'function') {
      if (!option) {
        return;
      }

      const cleanCssOptions = typeof option === 'object' ? option : {};

      options.minifyCSS = async function (text, type) {
        text = text.replace(/(url\s*\(\s*)("|'|)(.*?)\2(\s*\))/ig, function (match, prefix, quote, url, suffix) {
          return prefix + quote + options.minifyURLs(url) + quote + suffix;
        });

        const inputCSS = wrapCSS(text, type);

        return new Promise((resolve) => {
          new CleanCSS(cleanCssOptions).minify(inputCSS, (_err, output) => {
            if (output.errors.length > 0) {
              output.errors.forEach(options.log);
              resolve(text);
            }

            const outputCSS = unwrapCSS(output.styles, type);
            resolve(outputCSS);
          });
        });
      };
    } else if (key === 'minifyJS' && typeof option !== 'function') {
      if (!option) {
        return;
      }

      const terserOptions = typeof option === 'object' ? option : {};

      terserOptions.parse = {
        ...terserOptions.parse,
        bare_returns: false
      };

      options.minifyJS = async function (text, inline) {
        const start = text.match(/^\s*<!--.*/);
        const code = start ? text.slice(start[0].length).replace(/\n\s*-->\s*$/, '') : text;

        terserOptions.parse.bare_returns = inline;

        try {
          const result = await minify$1(code, terserOptions);
          return result.code.replace(/;$/, '');
        } catch (error) {
          options.log(error);
          return text;
        }
      };
    } else if (key === 'minifyURLs' && typeof option !== 'function') {
      if (!option) {
        return;
      }

      let relateUrlOptions = option;

      if (typeof option === 'string') {
        relateUrlOptions = { site: option };
      } else if (typeof option !== 'object') {
        relateUrlOptions = {};
      }

      options.minifyURLs = function (text) {
        try {
          return lib.relate(text, relateUrlOptions);
        } catch (err) {
          options.log(err);
          return text;
        }
      };
    } else {
      options[key] = option;
    }
  });
  return options;
};

function uniqueId(value) {
  let id;
  do {
    id = Math.random().toString(36).replace(/^0\.[0-9]*/, '');
  } while (~value.indexOf(id));
  return id;
}

const specialContentTags = new Set(['script', 'style']);

async function createSortFns(value, options, uidIgnore, uidAttr) {
  const attrChains = options.sortAttributes && Object.create(null);
  const classChain = options.sortClassName && new TokenChain();

  function attrNames(attrs) {
    return attrs.map(function (attr) {
      return options.name(attr.name);
    });
  }

  function shouldSkipUID(token, uid) {
    return !uid || token.indexOf(uid) === -1;
  }

  function shouldSkipUIDs(token) {
    return shouldSkipUID(token, uidIgnore) && shouldSkipUID(token, uidAttr);
  }

  async function scan(input) {
    let currentTag, currentType;
    const parser = new HTMLParser(input, {
      start: function (tag, attrs) {
        if (attrChains) {
          if (!attrChains[tag]) {
            attrChains[tag] = new TokenChain();
          }
          attrChains[tag].add(attrNames(attrs).filter(shouldSkipUIDs));
        }
        for (let i = 0, len = attrs.length; i < len; i++) {
          const attr = attrs[i];
          if (classChain && attr.value && options.name(attr.name) === 'class') {
            classChain.add(trimWhitespace(attr.value).split(/[ \t\n\f\r]+/).filter(shouldSkipUIDs));
          } else if (options.processScripts && attr.name.toLowerCase() === 'type') {
            currentTag = tag;
            currentType = attr.value;
          }
        }
      },
      end: function () {
        currentTag = '';
      },
      chars: async function (text) {
        if (options.processScripts && specialContentTags.has(currentTag) &&
          options.processScripts.indexOf(currentType) > -1) {
          await scan(text);
        }
      }
    });

    await parser.parse();
  }

  const log = options.log;
  options.log = identity;
  options.sortAttributes = false;
  options.sortClassName = false;
  await scan(await minifyHTML(value, options));
  options.log = log;
  if (attrChains) {
    const attrSorters = Object.create(null);
    for (const tag in attrChains) {
      attrSorters[tag] = attrChains[tag].createSorter();
    }
    options.sortAttributes = function (tag, attrs) {
      const sorter = attrSorters[tag];
      if (sorter) {
        const attrMap = Object.create(null);
        const names = attrNames(attrs);
        names.forEach(function (name, index) {
          (attrMap[name] || (attrMap[name] = [])).push(attrs[index]);
        });
        sorter.sort(names).forEach(function (name, index) {
          attrs[index] = attrMap[name].shift();
        });
      }
    };
  }
  if (classChain) {
    const sorter = classChain.createSorter();
    options.sortClassName = function (value) {
      return sorter.sort(value.split(/[ \n\f\r]+/)).join(' ');
    };
  }
}

async function minifyHTML(value, options, partialMarkup) {
  if (options.collapseWhitespace) {
    value = collapseWhitespace(value, options, true, true);
  }

  const buffer = [];
  let charsPrevTag;
  let currentChars = '';
  let hasChars;
  let currentTag = '';
  let currentAttrs = [];
  const stackNoTrimWhitespace = [];
  const stackNoCollapseWhitespace = [];
  let optionalStartTag = '';
  let optionalEndTag = '';
  const ignoredMarkupChunks = [];
  const ignoredCustomMarkupChunks = [];
  let uidIgnore;
  let uidAttr;
  let uidPattern;

  // temporarily replace ignored chunks with comments,
  // so that we don't have to worry what's there.
  // for all we care there might be
  // completely-horribly-broken-alien-non-html-emoj-cthulhu-filled content
  value = value.replace(/<!-- htmlmin:ignore -->([\s\S]*?)<!-- htmlmin:ignore -->/g, function (match, group1) {
    if (!uidIgnore) {
      uidIgnore = uniqueId(value);
      const pattern = new RegExp('^' + uidIgnore + '([0-9]+)$');
      if (options.ignoreCustomComments) {
        options.ignoreCustomComments = options.ignoreCustomComments.slice();
      } else {
        options.ignoreCustomComments = [];
      }
      options.ignoreCustomComments.push(pattern);
    }
    const token = '<!--' + uidIgnore + ignoredMarkupChunks.length + '-->';
    ignoredMarkupChunks.push(group1);
    return token;
  });

  const customFragments = options.ignoreCustomFragments.map(function (re) {
    return re.source;
  });
  if (customFragments.length) {
    const reCustomIgnore = new RegExp('\\s*(?:' + customFragments.join('|') + ')+\\s*', 'g');
    // temporarily replace custom ignored fragments with unique attributes
    value = value.replace(reCustomIgnore, function (match) {
      if (!uidAttr) {
        uidAttr = uniqueId(value);
        uidPattern = new RegExp('(\\s*)' + uidAttr + '([0-9]+)' + uidAttr + '(\\s*)', 'g');

        if (options.minifyCSS) {
          options.minifyCSS = (function (fn) {
            return function (text, type) {
              text = text.replace(uidPattern, function (match, prefix, index) {
                const chunks = ignoredCustomMarkupChunks[+index];
                return chunks[1] + uidAttr + index + uidAttr + chunks[2];
              });

              const ids = [];
              new CleanCSS().minify(wrapCSS(text, type)).warnings.forEach(function (warning) {
                const match = uidPattern.exec(warning);
                if (match) {
                  const id = uidAttr + match[2] + uidAttr;
                  text = text.replace(id, ignoreCSS(id));
                  ids.push(id);
                }
              });

              return fn(text, type).then(chunk => {
                ids.forEach(function (id) {
                  chunk = chunk.replace(ignoreCSS(id), id);
                });

                return chunk;
              });
            };
          })(options.minifyCSS);
        }

        if (options.minifyJS) {
          options.minifyJS = (function (fn) {
            return function (text, type) {
              return fn(text.replace(uidPattern, function (match, prefix, index) {
                const chunks = ignoredCustomMarkupChunks[+index];
                return chunks[1] + uidAttr + index + uidAttr + chunks[2];
              }), type);
            };
          })(options.minifyJS);
        }
      }

      const token = uidAttr + ignoredCustomMarkupChunks.length + uidAttr;
      ignoredCustomMarkupChunks.push(/^(\s*)[\s\S]*?(\s*)$/.exec(match));
      return '\t' + token + '\t';
    });
  }

  if ((options.sortAttributes && typeof options.sortAttributes !== 'function') ||
    (options.sortClassName && typeof options.sortClassName !== 'function')) {
    await createSortFns(value, options, uidIgnore, uidAttr);
  }

  function _canCollapseWhitespace(tag, attrs) {
    return options.canCollapseWhitespace(tag, attrs, canCollapseWhitespace);
  }

  function _canTrimWhitespace(tag, attrs) {
    return options.canTrimWhitespace(tag, attrs, canTrimWhitespace);
  }

  function removeStartTag() {
    let index = buffer.length - 1;
    while (index > 0 && !/^<[^/!]/.test(buffer[index])) {
      index--;
    }
    buffer.length = Math.max(0, index);
  }

  function removeEndTag() {
    let index = buffer.length - 1;
    while (index > 0 && !/^<\//.test(buffer[index])) {
      index--;
    }
    buffer.length = Math.max(0, index);
  }

  // look for trailing whitespaces, bypass any inline tags
  function trimTrailingWhitespace(index, nextTag) {
    for (let endTag = null; index >= 0 && _canTrimWhitespace(endTag); index--) {
      const str = buffer[index];
      const match = str.match(/^<\/([\w:-]+)>$/);
      if (match) {
        endTag = match[1];
      } else if (/>$/.test(str) || (buffer[index] = collapseWhitespaceSmart(str, null, nextTag, options))) {
        break;
      }
    }
  }

  // look for trailing whitespaces from previously processed text
  // which may not be trimmed due to a following comment or an empty
  // element which has now been removed
  function squashTrailingWhitespace(nextTag) {
    let charsIndex = buffer.length - 1;
    if (buffer.length > 1) {
      const item = buffer[buffer.length - 1];
      if (/^(?:<!|$)/.test(item) && item.indexOf(uidIgnore) === -1) {
        charsIndex--;
      }
    }
    trimTrailingWhitespace(charsIndex, nextTag);
  }

  const parser = new HTMLParser(value, {
    partialMarkup,
    continueOnParseError: options.continueOnParseError,
    customAttrAssign: options.customAttrAssign,
    customAttrSurround: options.customAttrSurround,
    html5: options.html5,

    start: async function (tag, attrs, unary, unarySlash, autoGenerated) {
      if (tag.toLowerCase() === 'svg') {
        options = Object.create(options);
        options.caseSensitive = true;
        options.keepClosingSlash = true;
        options.name = identity;
      }
      tag = options.name(tag);
      currentTag = tag;
      charsPrevTag = tag;
      if (!inlineTextTags.has(tag)) {
        currentChars = '';
      }
      hasChars = false;
      currentAttrs = attrs;

      let optional = options.removeOptionalTags;
      if (optional) {
        const htmlTag = htmlTags.has(tag);
        // <html> may be omitted if first thing inside is not comment
        // <head> may be omitted if first thing inside is an element
        // <body> may be omitted if first thing inside is not space, comment, <meta>, <link>, <script>, <style> or <template>
        // <colgroup> may be omitted if first thing inside is <col>
        // <tbody> may be omitted if first thing inside is <tr>
        if (htmlTag && canRemoveParentTag(optionalStartTag, tag)) {
          removeStartTag();
        }
        optionalStartTag = '';
        // end-tag-followed-by-start-tag omission rules
        if (htmlTag && canRemovePrecedingTag(optionalEndTag, tag)) {
          removeEndTag();
          // <colgroup> cannot be omitted if preceding </colgroup> is omitted
          // <tbody> cannot be omitted if preceding </tbody>, </thead> or </tfoot> is omitted
          optional = !isStartTagMandatory(optionalEndTag, tag);
        }
        optionalEndTag = '';
      }

      // set whitespace flags for nested tags (eg. <code> within a <pre>)
      if (options.collapseWhitespace) {
        if (!stackNoTrimWhitespace.length) {
          squashTrailingWhitespace(tag);
        }
        if (!unary) {
          if (!_canTrimWhitespace(tag, attrs) || stackNoTrimWhitespace.length) {
            stackNoTrimWhitespace.push(tag);
          }
          if (!_canCollapseWhitespace(tag, attrs) || stackNoCollapseWhitespace.length) {
            stackNoCollapseWhitespace.push(tag);
          }
        }
      }

      const openTag = '<' + tag;
      const hasUnarySlash = unarySlash && options.keepClosingSlash;

      buffer.push(openTag);

      if (options.sortAttributes) {
        options.sortAttributes(tag, attrs);
      }

      const parts = [];
      for (let i = attrs.length, isLast = true; --i >= 0;) {
        const normalized = await normalizeAttr(attrs[i], attrs, tag, options);
        if (normalized) {
          parts.unshift(buildAttr(normalized, hasUnarySlash, options, isLast, uidAttr));
          isLast = false;
        }
      }
      if (parts.length > 0) {
        buffer.push(' ');
        buffer.push.apply(buffer, parts);
      } else if (optional && optionalStartTags.has(tag)) {
        // start tag must never be omitted if it has any attributes
        optionalStartTag = tag;
      }

      buffer.push(buffer.pop() + (hasUnarySlash ? '/' : '') + '>');

      if (autoGenerated && !options.includeAutoGeneratedTags) {
        removeStartTag();
        optionalStartTag = '';
      }
    },
    end: function (tag, attrs, autoGenerated) {
      if (tag.toLowerCase() === 'svg') {
        options = Object.getPrototypeOf(options);
      }
      tag = options.name(tag);

      // check if current tag is in a whitespace stack
      if (options.collapseWhitespace) {
        if (stackNoTrimWhitespace.length) {
          if (tag === stackNoTrimWhitespace[stackNoTrimWhitespace.length - 1]) {
            stackNoTrimWhitespace.pop();
          }
        } else {
          squashTrailingWhitespace('/' + tag);
        }
        if (stackNoCollapseWhitespace.length &&
          tag === stackNoCollapseWhitespace[stackNoCollapseWhitespace.length - 1]) {
          stackNoCollapseWhitespace.pop();
        }
      }

      let isElementEmpty = false;
      if (tag === currentTag) {
        currentTag = '';
        isElementEmpty = !hasChars;
      }

      if (options.removeOptionalTags) {
        // <html>, <head> or <body> may be omitted if the element is empty
        if (isElementEmpty && topLevelTags.has(optionalStartTag)) {
          removeStartTag();
        }
        optionalStartTag = '';
        // </html> or </body> may be omitted if not followed by comment
        // </head> may be omitted if not followed by space or comment
        // </p> may be omitted if no more content in non-</a> parent
        // except for </dt> or </thead>, end tags may be omitted if no more content in parent element
        if (htmlTags.has(tag) && optionalEndTag && !trailingTags.has(optionalEndTag) && (optionalEndTag !== 'p' || !pInlineTags.has(tag))) {
          removeEndTag();
        }
        optionalEndTag = optionalEndTags.has(tag) ? tag : '';
      }

      if (options.removeEmptyElements && isElementEmpty && canRemoveElement(tag, attrs)) {
        // remove last "element" from buffer
        removeStartTag();
        optionalStartTag = '';
        optionalEndTag = '';
      } else {
        if (autoGenerated && !options.includeAutoGeneratedTags) {
          optionalEndTag = '';
        } else {
          buffer.push('</' + tag + '>');
        }
        charsPrevTag = '/' + tag;
        if (!inlineTags.has(tag)) {
          currentChars = '';
        } else if (isElementEmpty) {
          currentChars += '|';
        }
      }
    },
    chars: async function (text, prevTag, nextTag) {
      prevTag = prevTag === '' ? 'comment' : prevTag;
      nextTag = nextTag === '' ? 'comment' : nextTag;
      if (options.decodeEntities && text && !specialContentTags.has(currentTag)) {
        text = decodeHTML(text);
      }
      if (options.collapseWhitespace) {
        if (!stackNoTrimWhitespace.length) {
          if (prevTag === 'comment') {
            const prevComment = buffer[buffer.length - 1];
            if (prevComment.indexOf(uidIgnore) === -1) {
              if (!prevComment) {
                prevTag = charsPrevTag;
              }
              if (buffer.length > 1 && (!prevComment || (!options.conservativeCollapse && / $/.test(currentChars)))) {
                const charsIndex = buffer.length - 2;
                buffer[charsIndex] = buffer[charsIndex].replace(/\s+$/, function (trailingSpaces) {
                  text = trailingSpaces + text;
                  return '';
                });
              }
            }
          }
          if (prevTag) {
            if (prevTag === '/nobr' || prevTag === 'wbr') {
              if (/^\s/.test(text)) {
                let tagIndex = buffer.length - 1;
                while (tagIndex > 0 && buffer[tagIndex].lastIndexOf('<' + prevTag) !== 0) {
                  tagIndex--;
                }
                trimTrailingWhitespace(tagIndex - 1, 'br');
              }
            } else if (inlineTextTags.has(prevTag.charAt(0) === '/' ? prevTag.slice(1) : prevTag)) {
              text = collapseWhitespace(text, options, /(?:^|\s)$/.test(currentChars));
            }
          }
          if (prevTag || nextTag) {
            text = collapseWhitespaceSmart(text, prevTag, nextTag, options);
          } else {
            text = collapseWhitespace(text, options, true, true);
          }
          if (!text && /\s$/.test(currentChars) && prevTag && prevTag.charAt(0) === '/') {
            trimTrailingWhitespace(buffer.length - 1, nextTag);
          }
        }
        if (!stackNoCollapseWhitespace.length && nextTag !== 'html' && !(prevTag && nextTag)) {
          text = collapseWhitespace(text, options, false, false, true);
        }
      }
      if (options.processScripts && specialContentTags.has(currentTag)) {
        text = await processScript(text, options, currentAttrs);
      }
      if (isExecutableScript(currentTag, currentAttrs)) {
        text = await options.minifyJS(text);
      }
      if (isStyleSheet(currentTag, currentAttrs)) {
        text = await options.minifyCSS(text);
      }
      if (options.removeOptionalTags && text) {
        // <html> may be omitted if first thing inside is not comment
        // <body> may be omitted if first thing inside is not space, comment, <meta>, <link>, <script>, <style> or <template>
        if (optionalStartTag === 'html' || (optionalStartTag === 'body' && !/^\s/.test(text))) {
          removeStartTag();
        }
        optionalStartTag = '';
        // </html> or </body> may be omitted if not followed by comment
        // </head>, </colgroup> or </caption> may be omitted if not followed by space or comment
        if (compactTags.has(optionalEndTag) || (looseTags.has(optionalEndTag) && !/^\s/.test(text))) {
          removeEndTag();
        }
        optionalEndTag = '';
      }
      charsPrevTag = /^\s*$/.test(text) ? prevTag : 'comment';
      if (options.decodeEntities && text && !specialContentTags.has(currentTag)) {
        // Escape any `&` symbols that start either:
        // 1) a legacy named character reference (i.e. one that doesn't end with `;`)
        // 2) or any other character reference (i.e. one that does end with `;`)
        // Note that `&` can be escaped as `&amp`, without the semi-colon.
        // https://mathiasbynens.be/notes/ambiguous-ampersands
        text = text.replace(/&((?:Iacute|aacute|uacute|plusmn|Otilde|otilde|agrave|Agrave|Yacute|yacute|Oslash|oslash|atilde|Atilde|brvbar|ccedil|Ccedil|Ograve|curren|divide|eacute|Eacute|ograve|Oacute|egrave|Egrave|Ugrave|frac12|frac14|frac34|ugrave|oacute|iacute|Ntilde|ntilde|Uacute|middot|igrave|Igrave|iquest|Aacute|cedil|laquo|micro|iexcl|Icirc|icirc|acirc|Ucirc|Ecirc|ocirc|Ocirc|ecirc|ucirc|Aring|aring|AElig|aelig|acute|pound|raquo|Acirc|times|THORN|szlig|thorn|COPY|auml|ordf|ordm|Uuml|macr|uuml|Auml|ouml|Ouml|para|nbsp|euml|quot|QUOT|Euml|yuml|cent|sect|copy|sup1|sup2|sup3|iuml|Iuml|ETH|shy|reg|not|yen|amp|AMP|REG|uml|eth|deg|gt|GT|LT|lt)(?!;)|(?:#?[0-9a-zA-Z]+;))/g, '&amp$1').replace(/</g, '&lt;');
      }
      if (uidPattern && options.collapseWhitespace && stackNoTrimWhitespace.length) {
        text = text.replace(uidPattern, function (match, prefix, index) {
          return ignoredCustomMarkupChunks[+index][0];
        });
      }
      currentChars += text;
      if (text) {
        hasChars = true;
      }
      buffer.push(text);
    },
    comment: async function (text, nonStandard) {
      const prefix = nonStandard ? '<!' : '<!--';
      const suffix = nonStandard ? '>' : '-->';
      if (isConditionalComment(text)) {
        text = prefix + await cleanConditionalComment(text, options) + suffix;
      } else if (options.removeComments) {
        if (isIgnoredComment(text, options)) {
          text = '<!--' + text + '-->';
        } else {
          text = '';
        }
      } else {
        text = prefix + text + suffix;
      }
      if (options.removeOptionalTags && text) {
        // preceding comments suppress tag omissions
        optionalStartTag = '';
        optionalEndTag = '';
      }
      buffer.push(text);
    },
    doctype: function (doctype) {
      buffer.push(options.useShortDoctype
        ? '<!doctype' +
        (options.removeTagWhitespace ? '' : ' ') + 'html>'
        : collapseWhitespaceAll(doctype));
    }
  });

  await parser.parse();

  if (options.removeOptionalTags) {
    // <html> may be omitted if first thing inside is not comment
    // <head> or <body> may be omitted if empty
    if (topLevelTags.has(optionalStartTag)) {
      removeStartTag();
    }
    // except for </dt> or </thead>, end tags may be omitted if no more content in parent element
    if (optionalEndTag && !trailingTags.has(optionalEndTag)) {
      removeEndTag();
    }
  }
  if (options.collapseWhitespace) {
    squashTrailingWhitespace('br');
  }

  return joinResultSegments(buffer, options, uidPattern
    ? function (str) {
      return str.replace(uidPattern, function (match, prefix, index, suffix) {
        let chunk = ignoredCustomMarkupChunks[+index][0];
        if (options.collapseWhitespace) {
          if (prefix !== '\t') {
            chunk = prefix + chunk;
          }
          if (suffix !== '\t') {
            chunk += suffix;
          }
          return collapseWhitespace(chunk, {
            preserveLineBreaks: options.preserveLineBreaks,
            conservativeCollapse: !options.trimCustomFragments
          }, /^[ \n\r\t\f]/.test(chunk), /[ \n\r\t\f]$/.test(chunk));
        }
        return chunk;
      });
    }
    : identity, uidIgnore
    ? function (str) {
      return str.replace(new RegExp('<!--' + uidIgnore + '([0-9]+)-->', 'g'), function (match, index) {
        return ignoredMarkupChunks[+index];
      });
    }
    : identity);
}

function joinResultSegments(results, options, restoreCustom, restoreIgnore) {
  let str;
  const maxLineLength = options.maxLineLength;
  const noNewlinesBeforeTagClose = options.noNewlinesBeforeTagClose;

  if (maxLineLength) {
    let line = ''; const lines = [];
    while (results.length) {
      const len = line.length;
      const end = results[0].indexOf('\n');
      const isClosingTag = Boolean(results[0].match(endTag));
      const shouldKeepSameLine = noNewlinesBeforeTagClose && isClosingTag;

      if (end < 0) {
        line += restoreIgnore(restoreCustom(results.shift()));
      } else {
        line += restoreIgnore(restoreCustom(results[0].slice(0, end)));
        results[0] = results[0].slice(end + 1);
      }
      if (len > 0 && line.length > maxLineLength && !shouldKeepSameLine) {
        lines.push(line.slice(0, len));
        line = line.slice(len);
      } else if (end >= 0) {
        lines.push(line);
        line = '';
      }
    }
    if (line) {
      lines.push(line);
    }
    str = lines.join('\n');
  } else {
    str = restoreIgnore(restoreCustom(results.join('')));
  }
  return options.collapseWhitespace ? collapseWhitespace(str, options, true, true) : str;
}

const minify = async function (value, options) {
  const start = Date.now();
  options = processOptions(options || {});
  const result = await minifyHTML(value, options);
  options.log('minified in: ' + (Date.now() - start) + 'ms');
  return result;
};

var htmlminifier = { minify };

export { htmlminifier as default, minify };