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6.3 KiB
68 lines
6.3 KiB
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[](https://opencollective.com/core-js) [](https://www.npmjs.com/package/core-js) [](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18) [](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18) [](https://github.com/zloirock/core-js/actions) [](https://github.com/zloirock/core-js/actions) |
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> Modular standard library for JavaScript. Includes polyfills for [ECMAScript up to 2021](https://github.com/zloirock/core-js#ecmascript): [promises](https://github.com/zloirock/core-js#ecmascript-promise), [symbols](https://github.com/zloirock/core-js#ecmascript-symbol), [collections](https://github.com/zloirock/core-js#ecmascript-collections), iterators, [typed arrays](https://github.com/zloirock/core-js#ecmascript-typed-arrays), many other features, [ECMAScript proposals](https://github.com/zloirock/core-js#ecmascript-proposals), [some cross-platform WHATWG / W3C features and proposals](#web-standards) like [`URL`](https://github.com/zloirock/core-js#url-and-urlsearchparams). You can load only required features or use it without global namespace pollution. |
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## As advertising: the author is looking for a good job -) |
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## [core-js@3, babel and a look into the future](https://github.com/zloirock/core-js/tree/master/docs/2019-03-19-core-js-3-babel-and-a-look-into-the-future.md) |
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## Raising funds |
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`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**](https://opencollective.com/core-js), [**Patreon**](https://patreon.com/zloirock), **Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz )**. |
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--- |
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<a href="https://opencollective.com/core-js/sponsor/0/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/0/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/1/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/1/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/2/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/2/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/3/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/3/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/4/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/4/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/5/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/5/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/6/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/6/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/7/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/7/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/8/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/8/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/9/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/9/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/10/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/10/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/11/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/11/avatar.svg"></a> |
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--- |
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<a href="https://opencollective.com/core-js#backers" target="_blank"><img src="https://opencollective.com/core-js/backers.svg?width=890"></a> |
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--- |
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[*Example of usage*](https://tinyurl.com/2aj9lkwf): |
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```js |
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import 'core-js/actual'; // <- at the top of your entry point |
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Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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[1, 2, 3, 4, 5].group(it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } |
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Promise.resolve(42).then(x => console.log(x)); // => 42 |
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) |
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queueMicrotask(() => console.log('called as microtask')); |
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``` |
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*You can load only required features*: |
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```js |
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import 'core-js/actual/array/from'; // <- at the top of your entry point |
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import 'core-js/actual/array/group'; // <- at the top of your entry point |
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import 'core-js/actual/set'; // <- at the top of your entry point |
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import 'core-js/actual/promise'; // <- at the top of your entry point |
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import 'core-js/actual/structured-clone'; // <- at the top of your entry point |
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import 'core-js/actual/queue-microtask'; // <- at the top of your entry point |
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Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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[1, 2, 3, 4, 5].group(it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } |
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Promise.resolve(42).then(x => console.log(x)); // => 42 |
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) |
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queueMicrotask(() => console.log('called as microtask')); |
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``` |
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*Or use it without global namespace pollution*: |
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```js |
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import from from 'core-js-pure/actual/array/from'; |
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import group from 'core-js-pure/actual/array/group'; |
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import Set from 'core-js-pure/actual/set'; |
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import Promise from 'core-js-pure/actual/promise'; |
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import structuredClone from 'core-js-pure/actual/structured-clone'; |
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import queueMicrotask from 'core-js-pure/actual/queue-microtask'; |
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from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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group([1, 2, 3, 4, 5], it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] } |
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Promise.resolve(42).then(x => console.log(x)); // => 42 |
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3]) |
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queueMicrotask(() => console.log('called as microtask')); |
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``` |
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**It's a global version (first 2 examples), for more info see [`core-js` documentation](https://github.com/zloirock/core-js/blob/master/README.md).**
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