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core-js-compat package contains data about the necessity of core-js modules and API for getting a list of required core-js modules by browserslist query.

1import compat from 'core-js-compat';
2
3const {
4  list,                       // array of required modules
5  targets,                    // object with targets for each module
6} = compat({
7  targets: '> 1%',            // browserslist query or object of minimum environment versions to support, see below
8  modules: [                  // optional list / filter of modules - regex, string or an array of them:
9    'core-js/actual',         // - an entry point
10    'esnext.array.unique-by', // - a module name (or just a start of a module name)
11    /^web\./,                 // - regex that a module name must satisfy
12  ],
13  exclude: [                  // optional list / filter of modules to exclude, the signature is similar to `modules` option
14    'web.atob',
15  ],
16  version: '3.40',            // used `core-js` version, by default - the latest
17  inverse: false,             // inverse of the result - shows modules that are NOT required for the target environment
18});
19
20console.log(targets);
21/* =>
22{
23  'es.error.cause': { ios: '14.5-14.8' },
24  'es.aggregate-error.cause': { ios: '14.5-14.8' },
25  'es.array.at': { ios: '14.5-14.8' },
26  'es.array.find-last': { firefox: '100', ios: '14.5-14.8' },
27  'es.array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
28  'es.array.includes': { firefox: '100' },
29  'es.array.push': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
30  'es.array.unshift': { ios: '14.5-14.8', safari: '15.4' },
31  'es.object.has-own': { ios: '14.5-14.8' },
32  'es.regexp.flags': { chrome: '100', edge: '101' },
33  'es.string.at-alternative': { ios: '14.5-14.8' },
34  'es.typed-array.at': { ios: '14.5-14.8' },
35  'es.typed-array.find-last': { firefox: '100', ios: '14.5-14.8' },
36  'es.typed-array.find-last-index': { firefox: '100', ios: '14.5-14.8' },
37  'esnext.array.group': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
38  'esnext.array.group-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
39  'esnext.array.group-by-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
40  'esnext.array.group-to-map': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
41  'esnext.array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
42  'esnext.array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
43  'esnext.array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
44  'esnext.array.unique-by': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
45  'esnext.array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
46  'esnext.typed-array.to-reversed': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
47  'esnext.typed-array.to-sorted': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
48  'esnext.typed-array.to-spliced': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
49  'esnext.typed-array.with': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
50  'web.dom-exception.stack': { chrome: '100', edge: '101', ios: '14.5-14.8', safari: '15.4' },
51  'web.immediate': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' },
52  'web.structured-clone': { chrome: '100', edge: '101', firefox: '100', ios: '14.5-14.8', safari: '15.4' }
53}
54*/

targets option

targets could be a browserslist query or a targets object that specifies minimum environment versions to support:

1// browserslist query:
2'defaults, not IE 11, maintained node versions';
3// object (sure, all those fields optional):
4({
5  android: '4.0',         // Android WebView version
6  bun: '0.1.2',           // Bun version
7  chrome: '38',           // Chrome version
8  'chrome-android': '18', // Chrome for Android version
9  deno: '1.12',           // Deno version
10  edge: '13',             // Edge version
11  electron: '5.0',        // Electron framework version
12  firefox: '15',          // Firefox version
13  'firefox-android': '4', // Firefox for Android version
14  hermes: '0.11',         // Hermes version
15  ie: '8',                // Internet Explorer version
16  ios: '13.0',            // iOS Safari version
17  node: 'current',        // NodeJS version, you can use 'current' for set it to currently used
18  opera: '12',            // Opera version
19  'opera-android': '7',   // Opera for Android version
20  phantom: '1.9',         // PhantomJS headless browser version
21  quest: '5.0',           // Meta Quest Browser version
22  'react-native': '0.70', // React Native version (default Hermes engine)
23  rhino: '1.7.13',        // Rhino engine version
24  safari: '14.0',         // Safari version
25  samsung: '14.0',        // Samsung Internet version
26  esmodules: true,        // That option set target to minimum supporting ES Modules versions of all browsers
27  browsers: '> 0.25%',    // Browserslist query or object with target browsers
28});

Additional API:

1// equals of of the method from the example above
2require('core-js-compat/compat')({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
3// or
4require('core-js-compat').compat({ targets, modules, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
5
6// full compat data:
7require('core-js-compat/data'); // => { [ModuleName]: { [EngineName]: EngineVersion } }
8// or
9require('core-js-compat').data; // => { [ModuleName]: { [EngineName]: EngineVersion } }
10
11// map of modules by `core-js` entry points:
12require('core-js-compat/entries'); // => { [EntryPoint]: Array<ModuleName> }
13// or
14require('core-js-compat').entries; // => { [EntryPoint]: Array<ModuleName> }
15
16// full list of modules:
17require('core-js-compat/modules'); // => Array<ModuleName>
18// or
19require('core-js-compat').modules; // => Array<ModuleName>
20
21// the subset of modules which available in the passed `core-js` version:
22require('core-js-compat/get-modules-list-for-target-version')('3.40'); // => Array<ModuleName>
23// or
24require('core-js-compat').getModulesListForTargetVersion('3.40'); // => Array<ModuleName>

If you wanna help to improve this data, you could take a look at the related section of CONTRIBUTING.md. The visualization of compatibility data and the browser tests runner is available here, the example: