core-js-compat
Advanced tools
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.
const {
list, // array of required modules
targets, // object with targets for each module
} = require('core-js-compat')({
targets: '> 2.5%', // browserslist query or object of minimum environment versions to support
filter: /^(es|web)\./, // optional filter - string-prefix, regexp or list of modules
version: '3.4', // used `core-js` version, by default - the latest
});
console.log(targets);
/* =>
{
'es.symbol.match-all': { ios: '12.2-12.4' },
'es.array.unscopables.flat': { ios: '12.2-12.4' },
'es.array.unscopables.flat-map': { ios: '12.2-12.4' },
'es.math.hypot': { chrome: '77' },
'es.promise.all-settled': { firefox: '69', ios: '12.2-12.4' },
'es.promise.finally': { ios: '12.2-12.4' },
'es.string.match-all': { chrome: '77', firefox: '69', ios: '12.2-12.4' },
'es.string.replace': { firefox: '69', ios: '12.2-12.4' },
'es.typed-array.float32-array': { ios: '12.2-12.4' },
'es.typed-array.float64-array': { ios: '12.2-12.4' },
'es.typed-array.int8-array': { ios: '12.2-12.4' },
'es.typed-array.int16-array': { ios: '12.2-12.4' },
'es.typed-array.int32-array': { ios: '12.2-12.4' },
'es.typed-array.uint8-array': { ios: '12.2-12.4' },
'es.typed-array.uint8-clamped-array': { ios: '12.2-12.4' },
'es.typed-array.uint16-array': { ios: '12.2-12.4' },
'es.typed-array.uint32-array': { ios: '12.2-12.4' },
'es.typed-array.from': { ios: '12.2-12.4' },
'es.typed-array.of': { ios: '12.2-12.4' },
'web.dom-collections.iterator': { ios: '12.2-12.4' },
'web.immediate': { chrome: '77', firefox: '69', ios: '12.2-12.4' },
'web.url': { ios: '12.2-12.4' },
'web.url.to-json': { ios: '12.2-12.4' },
'web.url-search-params': { ios: '12.2-12.4' }
}
*/
Additional API:
// equals of of the method from the example above
require('core-js-compat/compat')({ targets, filter, version }); // => { list: Array<ModuleName>, targets: { [ModuleName]: { [EngineName]: EngineVersion } } }
// or
require('core-js-compat').compat({ targets, filter, 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')('3.3'); // => Array<ModuleName>
// or
require('core-js-compat').getModulesListForTargetVersion('3.3'); // => Array<ModuleName>
If you want to add new / update data about modules required for target engines, follow this instruction.
NumericRangeIterator as toStringTag instead of RangeIterator in { Number, BigInt }.range iterator, per this PRFAQs
core-js compat
The npm package core-js-compat receives a total of 0 weekly downloads. As such, core-js-compat popularity was classified as not popular.
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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