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				| 
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| 
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| <div align="center">
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| 
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| [](https://opencollective.com/core-js) [](https://github.com/zloirock/core-js/blob/master/CONTRIBUTING.md) [](https://www.npmjs.com/package/core-js-compat) [](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18)
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| 
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| </div>
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| 
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| [`core-js-compat` package](https://github.com/zloirock/core-js/tree/master/packages/core-js-compat) contains data about the necessity of [`core-js`](https://github.com/zloirock/core-js) modules and API for getting a list of required core-js modules by browserslist query.
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| 
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| ```js
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| import compat from 'core-js-compat';
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| 
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| const {
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|   list,                       // array of required modules
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|   targets,                    // object with targets for each module
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| } = compat({
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|   targets: '> 1%',            // browserslist query or object of minimum environment versions to support, see below
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|   modules: [                  // optional list / filter of modules - regex, sting or an array of them:
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|     'core-js/actual',         // - an entry point
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|     'esnext.array.unique-by', // - a module name (or just a start of a module name)
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|     /^web\./,                 // - regex that a module name must satisfy
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|   ],
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|   exclude: [                  // optional list / filter of modules to exclude, the signature is similar to `modules` option
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|     'web.atob',
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|   ],
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|   version: '3.27',            // used `core-js` version, by default - the latest
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|   inverse: false,             // inverse of the result - shows modules that are NOT required for the target environment
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| });
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| 
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| console.log(targets);
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| /* =>
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| {
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|   'es.error.cause': { ios: '14.5-14.8' },
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|   'es.aggregate-error.cause': { ios: '14.5-14.8' },
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|   'es.array.at': { ios: '14.5-14.8' },
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|   'es.array.find-last': { firefox: '100', ios: '14.5-14.8' },
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|   'es.array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
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|   'es.array.includes': { firefox: '100' },
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|   'es.array.push': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
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|   'es.array.unshift': { ios: '14.5-14.8', safari: '15.4' },
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|   'es.object.has-own': { ios: '14.5-14.8' },
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|   'es.regexp.flags': { chrome: '100', edge: '101' },
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|   'es.string.at-alternative': { ios: '14.5-14.8' },
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|   'es.typed-array.at': { ios: '14.5-14.8' },
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|   'es.typed-array.find-last': { firefox: '100', ios: '14.5-14.8' },
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|   'es.typed-array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
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|   'esnext.array.group': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.group-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.group-by-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.group-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.unique-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.typed-array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.typed-array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.typed-array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'esnext.typed-array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'web.dom-exception.stack': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
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|   'web.immediate': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
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|   'web.structured-clone': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' }
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| }
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| */
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| ```
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| 
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| ### `targets` option
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| `targets` could be [a `browserslist` query](https://github.com/browserslist/browserslist) or a targets object that specifies minimum environment versions to support:
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| ```js
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| // browserslist query:
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| 'defaults, not IE 11, maintained node versions'
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| // object (sure, all those fields optional):
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| {
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|   android: '4.0',         // Android WebView version
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|   bun: '0.1.2',           // Bun version
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|   chrome: '38',           // Chrome version
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|   'chrome-android': '18', // Chrome for Android version
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|   deno: '1.12',           // Deno version
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|   edge: '13',             // Edge version
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|   electron: '5.0',        // Electron framework version
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|   firefox: '15',          // Firefox version
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|   'firefox-android': '4', // Firefox for Android version
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|   hermes: '0.11',         // Hermes version
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|   ie: '8',                // Internet Explorer version
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|   ios: '13.0',            // iOS Safari version
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|   node: 'current',        // NodeJS version, you can use 'current' for set it to currently used
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|   opera: '12',            // Opera version
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|   'opera-android': '7',   // Opera for Android version
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|   phantom: '1.9',         // PhantomJS headless browser version
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|   quest: '5.0',           // Meta Quest Browser version
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|   'react-native': '0.70', // React Native version (default Hermes engine)
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|   rhino: '1.7.13',        // Rhino engine version
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|   safari: '14.0',         // Safari version
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|   samsung: '14.0',        // Samsung Internet version
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|   esmodules: true,        // That option set target to minimum supporting ES Modules versions of all browsers
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|   browsers: '> 0.25%',    // Browserslist query or object with target browsers
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| }
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| ```
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| 
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| ### Additional API:
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| 
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| ```js
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| // equals of of the method from the example above
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| require('core-js-compat/compat')({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
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| // or
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| require('core-js-compat').compat({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
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| 
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| // full compat data:
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| require('core-js-compat/data'); // => { [ModuleName]: { [EngineName]: EngineVersion } }
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| // or
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| require('core-js-compat').data; // => { [ModuleName]: { [EngineName]: EngineVersion } }
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| 
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| // map of modules by `core-js` entry points:
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| require('core-js-compat/entries'); // => { [EntryPoint]: Array<ModuleName> }
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| // or
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| require('core-js-compat').entries; // => { [EntryPoint]: Array<ModuleName> }
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| 
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| // full list of modules:
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| require('core-js-compat/modules'); // => Array<ModuleName>
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| // or
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| require('core-js-compat').modules; // => Array<ModuleName>
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| 
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| // the subset of modules which available in the passed `core-js` version:
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| require('core-js-compat/get-modules-list-for-target-version')('3.27'); // => Array<ModuleName>
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| // or
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| require('core-js-compat').getModulesListForTargetVersion('3.27'); // => Array<ModuleName>
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| ```
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| 
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| If you wanna help to improve this data, you could take a look at the related section of [`CONTRIBUTING.md`](https://github.com/zloirock/core-js/blob/master/CONTRIBUTING.md#how-to-update-core-js-compat-data). The visualization of compatibility data and the browser tests runner is available [here](http://zloirock.github.io/core-js/compat/), the example:
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| 
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| 
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