522 lines
14 KiB
JavaScript
522 lines
14 KiB
JavaScript
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'use strict';
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const {isParenthesized, getStaticValue, isCommaToken, hasSideEffect} = require('@eslint-community/eslint-utils');
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const {methodCallSelector} = require('./selectors/index.js');
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const needsSemicolon = require('./utils/needs-semicolon.js');
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const {getParenthesizedRange, getParenthesizedText} = require('./utils/parentheses.js');
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const shouldAddParenthesesToSpreadElementArgument = require('./utils/should-add-parentheses-to-spread-element-argument.js');
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const {isNodeMatches} = require('./utils/is-node-matches.js');
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const {
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replaceNodeOrTokenAndSpacesBefore,
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removeSpacesAfter,
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removeMethodCall,
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} = require('./fix/index.js');
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const {isLiteral} = require('./ast/index.js');
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const isMethodNamed = require('./utils/is-method-named.js');
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const ERROR_ARRAY_FROM = 'array-from';
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const ERROR_ARRAY_CONCAT = 'array-concat';
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const ERROR_ARRAY_SLICE = 'array-slice';
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const ERROR_ARRAY_TO_SPLICED = 'array-to-spliced';
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const ERROR_STRING_SPLIT = 'string-split';
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const SUGGESTION_CONCAT_ARGUMENT_IS_SPREADABLE = 'argument-is-spreadable';
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const SUGGESTION_CONCAT_ARGUMENT_IS_NOT_SPREADABLE = 'argument-is-not-spreadable';
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const SUGGESTION_CONCAT_TEST_ARGUMENT = 'test-argument';
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const SUGGESTION_CONCAT_SPREAD_ALL_ARGUMENTS = 'spread-all-arguments';
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const SUGGESTION_USE_SPREAD = 'use-spread';
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const messages = {
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[ERROR_ARRAY_FROM]: 'Prefer the spread operator over `Array.from(…)`.',
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[ERROR_ARRAY_CONCAT]: 'Prefer the spread operator over `Array#concat(…)`.',
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[ERROR_ARRAY_SLICE]: 'Prefer the spread operator over `Array#slice()`.',
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[ERROR_ARRAY_TO_SPLICED]: 'Prefer the spread operator over `Array#toSpliced()`.',
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[ERROR_STRING_SPLIT]: 'Prefer the spread operator over `String#split(\'\')`.',
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[SUGGESTION_CONCAT_ARGUMENT_IS_SPREADABLE]: 'First argument is an `array`.',
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[SUGGESTION_CONCAT_ARGUMENT_IS_NOT_SPREADABLE]: 'First argument is not an `array`.',
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[SUGGESTION_CONCAT_TEST_ARGUMENT]: 'Test first argument with `Array.isArray(…)`.',
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[SUGGESTION_CONCAT_SPREAD_ALL_ARGUMENTS]: 'Spread all unknown arguments`.',
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[SUGGESTION_USE_SPREAD]: 'Use `...` operator.',
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};
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const arrayFromCallSelector = [
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methodCallSelector({
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object: 'Array',
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method: 'from',
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minimumArguments: 1,
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maximumArguments: 3,
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}),
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// Allow `Array.from({length})`
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'[arguments.0.type!="ObjectExpression"]',
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].join('');
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const arrayConcatCallSelector = methodCallSelector('concat');
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const arraySliceCallSelector = [
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methodCallSelector({
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method: 'slice',
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minimumArguments: 0,
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maximumArguments: 1,
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}),
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'[callee.object.type!="ArrayExpression"]',
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].join('');
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const arrayToSplicedCallSelector = [
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methodCallSelector({
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method: 'toSpliced',
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argumentsLength: 0,
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}),
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'[callee.object.type!="ArrayExpression"]',
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].join('');
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const ignoredSliceCallee = [
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'arrayBuffer',
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'blob',
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'buffer',
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'file',
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'this',
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];
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const stringSplitCallSelector = methodCallSelector({
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method: 'split',
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argumentsLength: 1,
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});
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const isArrayLiteral = node => node.type === 'ArrayExpression';
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const isArrayLiteralHasTrailingComma = (node, sourceCode) => {
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if (node.elements.length === 0) {
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return false;
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}
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return isCommaToken(sourceCode.getLastToken(node, 1));
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};
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function fixConcat(node, sourceCode, fixableArguments) {
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const array = node.callee.object;
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const concatCallArguments = node.arguments;
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const arrayParenthesizedRange = getParenthesizedRange(array, sourceCode);
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const arrayIsArrayLiteral = isArrayLiteral(array);
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const arrayHasTrailingComma = arrayIsArrayLiteral && isArrayLiteralHasTrailingComma(array, sourceCode);
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const getArrayLiteralElementsText = (node, keepTrailingComma) => {
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if (
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!keepTrailingComma
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&& isArrayLiteralHasTrailingComma(node, sourceCode)
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) {
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const start = node.range[0] + 1;
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const end = sourceCode.getLastToken(node, 1).range[0];
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return sourceCode.text.slice(start, end);
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}
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return sourceCode.getText(node, -1, -1);
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};
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const getFixedText = () => {
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const nonEmptyArguments = fixableArguments
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.filter(({node, isArrayLiteral}) => (!isArrayLiteral || node.elements.length > 0));
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const lastArgument = nonEmptyArguments[nonEmptyArguments.length - 1];
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let text = nonEmptyArguments
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.map(({node, isArrayLiteral, isSpreadable, testArgument}) => {
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if (isArrayLiteral) {
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return getArrayLiteralElementsText(node, node === lastArgument.node);
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}
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let text = getParenthesizedText(node, sourceCode);
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if (testArgument) {
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return `...(Array.isArray(${text}) ? ${text} : [${text}])`;
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}
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if (isSpreadable) {
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if (
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!isParenthesized(node, sourceCode)
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&& shouldAddParenthesesToSpreadElementArgument(node)
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) {
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text = `(${text})`;
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}
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text = `...${text}`;
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}
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return text || ' ';
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})
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.join(', ');
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if (!text) {
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return '';
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}
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if (arrayIsArrayLiteral) {
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if (array.elements.length > 0) {
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text = ` ${text}`;
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if (!arrayHasTrailingComma) {
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text = `,${text}`;
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}
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if (
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arrayHasTrailingComma
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&& (!lastArgument.isArrayLiteral || !isArrayLiteralHasTrailingComma(lastArgument.node, sourceCode))
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) {
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text = `${text},`;
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}
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}
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} else {
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text = `, ${text}`;
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}
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return text;
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};
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function removeArguments(fixer) {
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const [firstArgument] = concatCallArguments;
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const lastArgument = concatCallArguments[fixableArguments.length - 1];
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const [start] = getParenthesizedRange(firstArgument, sourceCode);
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let [, end] = sourceCode.getTokenAfter(lastArgument, isCommaToken).range;
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const textAfter = sourceCode.text.slice(end);
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const [leadingSpaces] = textAfter.match(/^\s*/);
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end += leadingSpaces.length;
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return fixer.replaceTextRange([start, end], '');
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}
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return function * (fixer) {
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// Fixed code always starts with `[`
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if (
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!arrayIsArrayLiteral
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&& needsSemicolon(sourceCode.getTokenBefore(node), sourceCode, '[')
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) {
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yield fixer.insertTextBefore(node, ';');
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}
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if (concatCallArguments.length - fixableArguments.length === 0) {
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yield * removeMethodCall(fixer, node, sourceCode);
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} else {
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yield removeArguments(fixer);
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}
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const text = getFixedText();
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if (arrayIsArrayLiteral) {
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const closingBracketToken = sourceCode.getLastToken(array);
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yield fixer.insertTextBefore(closingBracketToken, text);
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} else {
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// The array is already accessing `.concat`, there should not any case need add extra `()`
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yield fixer.insertTextBeforeRange(arrayParenthesizedRange, '[...');
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yield fixer.insertTextAfterRange(arrayParenthesizedRange, text);
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yield fixer.insertTextAfterRange(arrayParenthesizedRange, ']');
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}
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};
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}
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const getConcatArgumentSpreadable = (node, scope) => {
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if (node.type === 'SpreadElement') {
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return;
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}
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if (isArrayLiteral(node)) {
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return {node, isArrayLiteral: true};
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}
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const result = getStaticValue(node, scope);
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if (!result) {
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return;
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}
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const isSpreadable = Array.isArray(result.value);
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return {node, isSpreadable};
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};
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function getConcatFixableArguments(argumentsList, scope) {
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const fixableArguments = [];
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for (const node of argumentsList) {
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const result = getConcatArgumentSpreadable(node, scope);
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if (result) {
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fixableArguments.push(result);
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} else {
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break;
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}
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}
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return fixableArguments;
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}
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function fixArrayFrom(node, sourceCode) {
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const [object] = node.arguments;
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function getObjectText() {
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if (isArrayLiteral(object)) {
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return sourceCode.getText(object);
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}
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const [start, end] = getParenthesizedRange(object, sourceCode);
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let text = sourceCode.text.slice(start, end);
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if (
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!isParenthesized(object, sourceCode)
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&& shouldAddParenthesesToSpreadElementArgument(object)
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) {
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text = `(${text})`;
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}
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return `[...${text}]`;
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}
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function * removeObject(fixer) {
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yield * replaceNodeOrTokenAndSpacesBefore(object, '', fixer, sourceCode);
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const commaToken = sourceCode.getTokenAfter(object, isCommaToken);
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yield * replaceNodeOrTokenAndSpacesBefore(commaToken, '', fixer, sourceCode);
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yield removeSpacesAfter(commaToken, sourceCode, fixer);
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}
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return function * (fixer) {
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// Fixed code always starts with `[`
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if (needsSemicolon(sourceCode.getTokenBefore(node), sourceCode, '[')) {
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yield fixer.insertTextBefore(node, ';');
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}
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const objectText = getObjectText();
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if (node.arguments.length === 1) {
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yield fixer.replaceText(node, objectText);
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return;
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}
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// `Array.from(object, mapFunction, thisArgument)` -> `[...object].map(mapFunction, thisArgument)`
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yield fixer.replaceText(node.callee.object, objectText);
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yield fixer.replaceText(node.callee.property, 'map');
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yield * removeObject(fixer);
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};
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}
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function methodCallToSpread(node, sourceCode) {
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return function * (fixer) {
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// Fixed code always starts with `[`
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if (needsSemicolon(sourceCode.getTokenBefore(node), sourceCode, '[')) {
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yield fixer.insertTextBefore(node, ';');
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}
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yield fixer.insertTextBefore(node, '[...');
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yield fixer.insertTextAfter(node, ']');
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// The array is already accessing `.slice` or `.split`, there should not any case need add extra `()`
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yield * removeMethodCall(fixer, node, sourceCode);
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};
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}
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function isClassName(node) {
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if (node.type === 'MemberExpression') {
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node = node.property;
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}
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if (node.type !== 'Identifier') {
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return false;
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}
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const {name} = node;
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return /^[A-Z]./.test(name) && name.toUpperCase() !== name;
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}
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function isNotArray(node, scope) {
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if (
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node.type === 'TemplateLiteral'
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|| node.type === 'Literal'
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|| node.type === 'BinaryExpression'
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|| isClassName(node)
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// `foo.join()`
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|| (isMethodNamed(node, 'join') && node.arguments.length <= 1)
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) {
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return true;
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}
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const staticValue = getStaticValue(node, scope);
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if (staticValue && !Array.isArray(staticValue.value)) {
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return true;
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}
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return false;
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}
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/** @param {import('eslint').Rule.RuleContext} context */
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const create = context => {
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const sourceCode = context.getSourceCode();
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return {
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[arrayFromCallSelector](node) {
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return {
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node,
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messageId: ERROR_ARRAY_FROM,
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fix: fixArrayFrom(node, sourceCode),
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};
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},
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[arrayConcatCallSelector](node) {
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const {object} = node.callee;
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if (isNotArray(object, context.getScope())) {
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return;
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}
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const scope = context.getScope();
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const staticResult = getStaticValue(object, scope);
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if (staticResult && !Array.isArray(staticResult.value)) {
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return;
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}
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const problem = {
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node: node.callee.property,
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messageId: ERROR_ARRAY_CONCAT,
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};
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const fixableArguments = getConcatFixableArguments(node.arguments, scope);
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if (fixableArguments.length > 0 || node.arguments.length === 0) {
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problem.fix = fixConcat(node, sourceCode, fixableArguments);
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return problem;
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}
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const [firstArgument, ...restArguments] = node.arguments;
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if (firstArgument.type === 'SpreadElement') {
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|
|
return problem;
|
||
|
|
}
|
||
|
|
|
||
|
|
const fixableArgumentsAfterFirstArgument = getConcatFixableArguments(restArguments, scope);
|
||
|
|
const suggestions = [
|
||
|
|
{
|
||
|
|
messageId: SUGGESTION_CONCAT_ARGUMENT_IS_SPREADABLE,
|
||
|
|
isSpreadable: true,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
messageId: SUGGESTION_CONCAT_ARGUMENT_IS_NOT_SPREADABLE,
|
||
|
|
isSpreadable: false,
|
||
|
|
},
|
||
|
|
];
|
||
|
|
|
||
|
|
if (!hasSideEffect(firstArgument, sourceCode)) {
|
||
|
|
suggestions.push({
|
||
|
|
messageId: SUGGESTION_CONCAT_TEST_ARGUMENT,
|
||
|
|
testArgument: true,
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
problem.suggest = suggestions.map(({messageId, isSpreadable, testArgument}) => ({
|
||
|
|
messageId,
|
||
|
|
fix: fixConcat(
|
||
|
|
node,
|
||
|
|
sourceCode,
|
||
|
|
// When apply suggestion, we also merge fixable arguments after the first one
|
||
|
|
[
|
||
|
|
{
|
||
|
|
node: firstArgument,
|
||
|
|
isSpreadable,
|
||
|
|
testArgument,
|
||
|
|
},
|
||
|
|
...fixableArgumentsAfterFirstArgument,
|
||
|
|
],
|
||
|
|
),
|
||
|
|
}));
|
||
|
|
|
||
|
|
if (
|
||
|
|
fixableArgumentsAfterFirstArgument.length < restArguments.length
|
||
|
|
&& restArguments.every(({type}) => type !== 'SpreadElement')
|
||
|
|
) {
|
||
|
|
problem.suggest.push({
|
||
|
|
messageId: SUGGESTION_CONCAT_SPREAD_ALL_ARGUMENTS,
|
||
|
|
fix: fixConcat(
|
||
|
|
node,
|
||
|
|
sourceCode,
|
||
|
|
node.arguments.map(node => getConcatArgumentSpreadable(node, scope) || {node, isSpreadable: true}),
|
||
|
|
),
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
return problem;
|
||
|
|
},
|
||
|
|
[arraySliceCallSelector](node) {
|
||
|
|
if (isNodeMatches(node.callee.object, ignoredSliceCallee)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const [firstArgument] = node.arguments;
|
||
|
|
if (firstArgument && !isLiteral(firstArgument, 0)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
node: node.callee.property,
|
||
|
|
messageId: ERROR_ARRAY_SLICE,
|
||
|
|
fix: methodCallToSpread(node, sourceCode),
|
||
|
|
};
|
||
|
|
},
|
||
|
|
[arrayToSplicedCallSelector](node) {
|
||
|
|
return {
|
||
|
|
node: node.callee.property,
|
||
|
|
messageId: ERROR_ARRAY_TO_SPLICED,
|
||
|
|
fix: methodCallToSpread(node, sourceCode),
|
||
|
|
};
|
||
|
|
},
|
||
|
|
[stringSplitCallSelector](node) {
|
||
|
|
const [separator] = node.arguments;
|
||
|
|
if (!isLiteral(separator, '')) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const string = node.callee.object;
|
||
|
|
const staticValue = getStaticValue(string, context.getScope());
|
||
|
|
let hasSameResult = false;
|
||
|
|
if (staticValue) {
|
||
|
|
const {value} = staticValue;
|
||
|
|
|
||
|
|
if (typeof value !== 'string') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// eslint-disable-next-line unicorn/prefer-spread
|
||
|
|
const resultBySplit = value.split('');
|
||
|
|
const resultBySpread = [...value];
|
||
|
|
|
||
|
|
hasSameResult = resultBySplit.length === resultBySpread.length
|
||
|
|
&& resultBySplit.every((character, index) => character === resultBySpread[index]);
|
||
|
|
}
|
||
|
|
|
||
|
|
const problem = {
|
||
|
|
node: node.callee.property,
|
||
|
|
messageId: ERROR_STRING_SPLIT,
|
||
|
|
};
|
||
|
|
|
||
|
|
if (hasSameResult) {
|
||
|
|
problem.fix = methodCallToSpread(node, sourceCode);
|
||
|
|
} else {
|
||
|
|
problem.suggest = [
|
||
|
|
{
|
||
|
|
messageId: SUGGESTION_USE_SPREAD,
|
||
|
|
fix: methodCallToSpread(node, sourceCode),
|
||
|
|
},
|
||
|
|
];
|
||
|
|
}
|
||
|
|
|
||
|
|
return problem;
|
||
|
|
},
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
/** @type {import('eslint').Rule.RuleModule} */
|
||
|
|
module.exports = {
|
||
|
|
create,
|
||
|
|
meta: {
|
||
|
|
type: 'suggestion',
|
||
|
|
docs: {
|
||
|
|
description: 'Prefer the spread operator over `Array.from(…)`, `Array#concat(…)`, `Array#{slice,toSpliced}()` and `String#split(\'\')`.',
|
||
|
|
},
|
||
|
|
fixable: 'code',
|
||
|
|
hasSuggestions: true,
|
||
|
|
messages,
|
||
|
|
},
|
||
|
|
};
|