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core-js

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core-js

Standard library

    3.24.1latest

Version published
Maintainers
1
Weekly downloads
39,506,417
decreased by-4.55%

Weekly downloads

Changelog

Source

3.24.1 - 2022.07.30

  • NodeJS is ignored in IS_BROWSER detection to avoid a false positive with jsdom, #1110
  • Fixed detection of @@species support in Promise in some old engines
  • { Array, %TypedArray% }.prototype.{ findLast, findLastIndex } marked as shipped in FF104
  • Added iOS Safari 15.6 compat data mapping
  • Fixed Opera 15 compat data mapping

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Open Collective version core-js downloads core-js-pure downloads tests eslint

Modular standard library for JavaScript. Includes polyfills for ECMAScript up to 2021: promises, symbols, collections, iterators, typed arrays, many other features, ECMAScript proposals, some cross-platform WHATWG / W3C features and proposals like URL. You can load only required features or use it without global namespace pollution.

As advertising: the author is looking for a good job -)

[email protected], babel and a look into the future

Raising funds

core-js isn't backed by a company, so the future of this project depends on you. Become a sponsor or a backer if you are interested in core-js: Open Collective, Patreon, Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz ).




Example of usage:

import 'core-js/actual'; // <- at the top of your entry point Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] [1, 2, 3, 4, 5].group(it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } Promise.resolve(42).then(x => console.log(x)); // => 42 structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) queueMicrotask(() => console.log('called as microtask'));

You can load only required features:

import 'core-js/actual/array/from'; // <- at the top of your entry point import 'core-js/actual/array/group'; // <- at the top of your entry point import 'core-js/actual/set'; // <- at the top of your entry point import 'core-js/actual/promise'; // <- at the top of your entry point import 'core-js/actual/structured-clone'; // <- at the top of your entry point import 'core-js/actual/queue-microtask'; // <- at the top of your entry point Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] [1, 2, 3, 4, 5].group(it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } Promise.resolve(42).then(x => console.log(x)); // => 42 structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) queueMicrotask(() => console.log('called as microtask'));

Or use it without global namespace pollution:

import from from 'core-js-pure/actual/array/from'; import group from 'core-js-pure/actual/array/group'; import Set from 'core-js-pure/actual/set'; import Promise from 'core-js-pure/actual/promise'; import structuredClone from 'core-js-pure/actual/structured-clone'; import queueMicrotask from 'core-js-pure/actual/queue-microtask'; from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] group([1, 2, 3, 4, 5], it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } Promise.resolve(42).then(x => console.log(x)); // => 42 structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) queueMicrotask(() => console.log('called as microtask'));

It's a global version (first 2 examples), for more info see core-js documentation.

Keywords

FAQs

What is core-js?

Standard library

Is core-js popular?

The npm package core-js receives a total of 31,909,165 weekly downloads. As such, core-js popularity was classified as popular.

Is core-js well maintained?

We found that core-js 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.

Last updated on 29 Jul 2022
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