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![logo](https://user-images.githubusercontent.com/2213682/146607186-8e13ddef-26a4-4ebf-befd-5aac9d77c090.png)

[`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.

```js
import compat from 'core-js-compat';

const {
  list,                         // array of required modules
  targets,                      // object with targets for each module
} = compat({
  targets: '> 1%',              // browserslist query or object of minimum environment versions to support, see below
  modules: [                    // optional list / filter of modules - regex, sting or an array of them:
    'core-js/actual',           // - an entry point
    'esnext.array.unique-by',   // - a module name (or just a start of a module name)
    /^web\./,                   // - regex that a module name must satisfy
  ],
  exclude: [                    // optional list / filter of modules to exclude, the signature is similar to `modules` option
    'web.atob',
  ],
  version: '3.23',              // used `core-js` version, by default - the latest
});

console.log(targets);
/* =>
{
  'es.error.cause': { ios: '14.5-14.8' },
  'es.aggregate-error.cause': { ios: '14.5-14.8' },
  'es.array.at': { ios: '14.5-14.8' },
  'es.array.find-last': { firefox: '100', ios: '14.5-14.8' },
  'es.array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
  'es.array.includes': { firefox: '100' },
  'es.array.push': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
  'es.array.unshift': { ios: '14.5-14.8', safari: '15.4' },
  'es.object.has-own': { ios: '14.5-14.8' },
  'es.regexp.flags': { chrome: '100', edge: '101' },
  'es.string.at-alternative': { ios: '14.5-14.8' },
  'es.typed-array.at': { ios: '14.5-14.8' },
  'es.typed-array.find-last': { firefox: '100', ios: '14.5-14.8' },
  'es.typed-array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
  'esnext.array.group': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.group-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.group-by-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.group-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.unique-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.typed-array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.typed-array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.typed-array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'esnext.typed-array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'web.dom-exception.stack': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
  'web.immediate': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
  'web.structured-clone': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' }
}
*/
```

### `targets` option
`targets` could be [a `browserslist` query](https://github.com/browserslist/browserslist) or a targets object that specifies minimum environment versions to support:
```js
// browserslist query:
'defaults, not IE 11, maintained node versions'
// object:
{
  android: '4.0',      // Android WebView version
  chrome: '38',        // Chrome version
  deno: '1.12',        // Deno version
  edge: '13',          // Edge version
  electron: '5.0',     // Electron framework version
  firefox: '15',       // Firefox version
  ie: '8',             // Internet Explorer version
  ios: '13.0',         // iOS Safari version
  node: 'current',     // NodeJS version, you could use 'current' for set it to currently used
  opera: '12',         // Opera version
  opera_mobile: '7',   // Opera Mobile version
  phantom: '1.9',      // PhantomJS headless browser version
  rhino: '1.7.13',     // Rhino engine version
  safari: '14.0',      // Safari version
  samsung: '14.0',     // Samsung Internet version
  esmodules: true,     // That option set target to minimum supporting ES Modules versions of all browsers
  browsers: '> 0.25%', // Browserslist query or object with target browsers
}
```

### Additional API:

```js
// equals of of the method from the example above
require('core-js-compat/compat')({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
// or
require('core-js-compat').compat({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }

// full compat data:
require('core-js-compat/data'); // => { [ModuleName]: { [EngineName]: EngineVersion } }
// or
require('core-js-compat').data; // => { [ModuleName]: { [EngineName]: EngineVersion } }

// map of modules by `core-js` entry points:
require('core-js-compat/entries'); // => { [EntryPoint]: Array<ModuleName> }
// or
require('core-js-compat').entries; // => { [EntryPoint]: Array<ModuleName> }

// full list of modules:
require('core-js-compat/modules'); // => Array<ModuleName>
// or
require('core-js-compat').modules; // => Array<ModuleName>

// the subset of modules which available in the passed `core-js` version:
require('core-js-compat/get-modules-list-for-target-version')('3.23'); // => Array<ModuleName>
// or
require('core-js-compat').getModulesListForTargetVersion('3.23'); // => Array<ModuleName>
```

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://es6.zloirock.ru/compat/), the example:

![compat-table](https://user-images.githubusercontent.com/2213682/173199354-1f3aeb83-7231-46b2-8a14-a9d47ce3ae45.png)

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