!function(global,factory){"object"==typeof exports&&"undefined"!=typeof module?module.exports=factory():"function"==typeof define&&define.amd?define(factory):(global="undefined"!=typeof globalThis?globalThis:global||self).state=factory()}(this,(function(){"use strict";function _defineProperty(obj,key,value){return key in obj?Object.defineProperty(obj,key,{value:value,enumerable:!0,configurable:!0,writable:!0}):obj[key]=value,obj}function ownKeys(object,enumerableOnly){var keys=Object.keys(object);if(Object.getOwnPropertySymbols){var symbols=Object.getOwnPropertySymbols(object);enumerableOnly&&(symbols=symbols.filter((function(sym){return Object.getOwnPropertyDescriptor(object,sym).enumerable}))),keys.push.apply(keys,symbols)}return keys}function _objectSpread2(target){for(var i=1;i<arguments.length;i++){var source=null!=arguments[i]?arguments[i]:{};i%2?ownKeys(Object(source),!0).forEach((function(key){_defineProperty(target,key,source[key])})):Object.getOwnPropertyDescriptors?Object.defineProperties(target,Object.getOwnPropertyDescriptors(source)):ownKeys(Object(source)).forEach((function(key){Object.defineProperty(target,key,Object.getOwnPropertyDescriptor(source,key))}))}return target}function compose(){for(var _len=arguments.length,fns=new Array(_len),_key=0;_key<_len;_key++)fns[_key]=arguments[_key];return function(x){return fns.reduceRight((function(y,f){return f(y)}),x)}}function curry(fn){return function curried(){for(var _this=this,_len2=arguments.length,args=new Array(_len2),_key2=0;_key2<_len2;_key2++)args[_key2]=arguments[_key2];return args.length>=fn.length?fn.apply(this,args):function(){for(var _len3=arguments.length,nextArgs=new Array(_len3),_key3=0;_key3<_len3;_key3++)nextArgs[_key3]=arguments[_key3];return curried.apply(_this,[].concat(args,nextArgs))}}}function isObject(value){return{}.toString.call(value).includes("Object")}function isFunction(value){return"function"==typeof value}var errorHandler=curry((function(errorMessages,type){throw new Error(errorMessages[type]||errorMessages.default)}))({initialIsRequired:"initial state is required",initialType:"initial state should be an object",initialContent:"initial state shouldn't be an empty object",handlerType:"handler should be an object or a function",handlersType:"all handlers should be a functions",selectorType:"selector should be a function",changeType:"provided value of changes should be an object",changeField:'it seams you want to change a field in the state which is not specified in the "initial" state',default:"an unknown error accured in `state-local` package"}),validators={changes:function(initial,changes){return isObject(changes)||errorHandler("changeType"),Object.keys(changes).some((function(field){return object=initial,property=field,!Object.prototype.hasOwnProperty.call(object,property);var object,property}))&&errorHandler("changeField"),changes},selector:function(selector){isFunction(selector)||errorHandler("selectorType")},handler:function(handler){isFunction(handler)||isObject(handler)||errorHandler("handlerType"),isObject(handler)&&Object.values(handler).some((function(_handler){return!isFunction(_handler)}))&&errorHandler("handlersType")},initial:function(initial){var obj;initial||errorHandler("initialIsRequired"),isObject(initial)||errorHandler("initialType"),obj=initial,Object.keys(obj).length||errorHandler("initialContent")}};function extractChanges(state,causedChanges){return isFunction(causedChanges)?causedChanges(state.current):causedChanges}function updateState(state,changes){return state.current=_objectSpread2(_objectSpread2({},state.current),changes),changes}function didStateUpdate(state,handler,changes){return isFunction(handler)?handler(state.current):Object.keys(changes).forEach((function(field){var _handler$field;return null===(_handler$field=handler[field])||void 0===_handler$field?void 0:_handler$field.call(handler,state.current[field])})),changes}return{create:function(initial){var handler=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};validators.initial(initial),validators.handler(handler);var state={current:initial},didUpdate=curry(didStateUpdate)(state,handler),update=curry(updateState)(state),validate=curry(validators.changes)(initial),getChanges=curry(extractChanges)(state);function getState(){var selector=arguments.length>0&&void 0!==arguments[0]?arguments[0]:function(state){return state};return validators.selector(selector),selector(state.current)}function setState(causedChanges){compose(didUpdate,update,validate,getChanges)(causedChanges)}return[getState,setState]}}}));