core-js-compat
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The core-js-compat package provides compatibility data for core-js, which is a modular standard library for JavaScript, including polyfills for ECMAScript up to the latest standards. It is useful for developers who need to know which features are available in core-js for a specific version of a browser or Node.js.
Compatibility Data Retrieval
Retrieve a list of features supported by core-js for a specific environment, such as Chrome 70.
const { list } = require('core-js-compat')({ targets: 'chrome 70' });Custom Build Generation
Generate a list of core-js modules required to support a specific target, such as Internet Explorer 11, with a specific version of core-js.
const { getModulesListForTargetVersion } = require('core-js-compat');
const modulesList = getModulesListForTargetVersion({ targets: { ie: 11 }, version: '3.6' });Babel-polyfill is a package that includes Babel transforms and a polyfill that includes a custom regenerator runtime and core-js. It is similar to core-js-compat in that it provides polyfills for ECMAScript features, but it is less modular and is deprecated in favor of directly including core-js and regenerator-runtime.
The es6-shim package provides polyfills for ECMAScript 6 (also known as ECMAScript 2015) features. It is similar to core-js-compat in providing polyfills, but it is focused only on ES6 features and does not provide the modular approach or the compatibility data that core-js-compat offers.
The polyfill-service package by Financial Times provides a service that returns a set of polyfills based on the user-agent string of the browser making the request. It is similar to core-js-compat in that it aims to provide polyfills for compatibility, but it does so as a service rather than a package to include in your project.
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.
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, string 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: '3.39', // used `core-js` version, by default - the latest
inverse: false, // inverse of the result - shows modules that are NOT required for the target environment
});
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 optiontargets could be a browserslist query or a targets object that specifies minimum environment versions to support:
// browserslist query:
'defaults, not IE 11, maintained node versions';
// object (sure, all those fields optional):
({
android: '4.0', // Android WebView version
bun: '0.1.2', // Bun version
chrome: '38', // Chrome version
'chrome-android': '18', // Chrome for Android version
deno: '1.12', // Deno version
edge: '13', // Edge version
electron: '5.0', // Electron framework version
firefox: '15', // Firefox version
'firefox-android': '4', // Firefox for Android version
hermes: '0.11', // Hermes version
ie: '8', // Internet Explorer version
ios: '13.0', // iOS Safari version
node: 'current', // NodeJS version, you can use 'current' for set it to currently used
opera: '12', // Opera version
'opera-android': '7', // Opera for Android version
phantom: '1.9', // PhantomJS headless browser version
quest: '5.0', // Meta Quest Browser version
'react-native': '0.70', // React Native version (default Hermes engine)
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
});
// 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')('3.39'); // => Array<ModuleName>
// or
require('core-js-compat').getModulesListForTargetVersion('3.39'); // => 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:
Iterator helpers proposal:
Iterator
Iterator.fromIterator.prototype.dropIterator.prototype.everyIterator.prototype.filterIterator.prototype.findIterator.prototype.flatMapIterator.prototype.forEachIterator.prototype.mapIterator.prototype.reduceIterator.prototype.someIterator.prototype.takeIterator.prototype.toArrayIterator.prototype[@@toStringTag]es. namespace modules, /es/ and /stable/ namespaces entriesPromise.try:
Promise.tryes. namespace module, /es/ and /stable/ namespaces entries/actual|full/promise/try entries for the callback arguments supportMath.sumPrecise proposal:
Math.sumPrecise/actual/ namespace entries, unconditional forced replacement changed to feature detectionIterator sequencing stage 2.7 proposal:
Iterator.concatMap upsert stage 2 proposal:
Map.prototype.getOrInsertMap.prototype.getOrInsertComputedWeakMap.prototype.getOrInsertWeakMap.prototype.getOrInsertComputed@@species pattern removed from %TypedArray% and ArrayBuffer methods, tc39/ecma262/3450:
%TypedArray%.prototype.filter%TypedArray%.prototype.filterReject%TypedArray%.prototype.map%TypedArray%.prototype.slice%TypedArray%.prototype.subarrayArrayBuffer.prototype.sliceUint8Array to / from base64 and hex proposal methods marked as shipped from FF133self descriptor is fixed in Deno 1.46.0Iterator helpers proposal methods marked as shipped from Bun 1.1.31FAQs
core-js compat
We found that core-js-compat demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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