core-js-pure

Standard library

MIT 165 个版本
ES3 ES5 ES6 ES7 ES2015 ES2016 ES2017 ES2018 ES2019 ES2020 ES2021 ES2022 ES2023 ES2024 ES2025 ES2026 ECMAScript 3 ECMAScript 5 ECMAScript 6 ECMAScript 7 ECMAScript 2015 ECMAScript 2016 ECMAScript 2017 ECMAScript 2018 ECMAScript 2019 ECMAScript 2020 ECMAScript 2021 ECMAScript 2022 ECMAScript 2023 ECMAScript 2024 ECMAScript 2025 ECMAScript 2026 Map Set WeakMap WeakSet TypedArray Promise Observable Symbol Iterator AsyncIterator URL URLSearchParams queueMicrotask setImmediate structuredClone polyfill ponyfill shim
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npm install core-js-pure
yarn add core-js-pure
pnpm add core-js-pure
bun add core-js-pure
README

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fundraising PRs welcome version core-js-pure downloads

I highly recommend reading this: So, what's next?

core-js is a modular standard library for JavaScript. Includes polyfills for ECMAScript up to 2026: 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.

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, Boosty, Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz ), Alipay.

Example of usage:

import 'core-js/actual';

Promise.try(() => 42).then(it => console.log(it)); // => 42

Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]

Iterator.concat([1, 2], function * (i) { while (true) yield i++; }(3))
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

You can load only required features:

import 'core-js/actual/promise';
import 'core-js/actual/set';
import 'core-js/actual/iterator';
import 'core-js/actual/array/from';
import 'core-js/actual/array/flat-map';
import 'core-js/actual/structured-clone';

Promise.try(() => 42).then(it => console.log(it)); // => 42

Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]

Iterator.concat([1, 2], function * (i) { while (true) yield i++; }(3))
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

Or use it without global namespace pollution:

import Promise from 'core-js-pure/actual/promise';
import Set from 'core-js-pure/actual/set';
import Iterator from 'core-js-pure/actual/iterator';
import from from 'core-js-pure/actual/array/from';
import flatMap from 'core-js-pure/actual/array/flat-map';
import structuredClone from 'core-js-pure/actual/structured-clone';

Promise.try(() => 42).then(it => console.log(it)); // => 42

from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

flatMap([1, 2], it => [it, it]); // => [1, 1, 2, 2]

Iterator.concat([1, 2], function * (i) { while (true) yield i++; }(3))
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

It's a version without global namespace pollution (the third example), for more info see core-js documentation.

版本列表
3.49.0 2026-03-16
3.48.0 2026-01-21
3.47.0 2025-11-18
3.46.0 2025-10-09
3.45.1 2025-08-20
3.45.0 2025-08-04
3.44.0 2025-07-07
3.43.0 2025-06-09
3.42.0 2025-04-29
3.41.0 2025-03-01
3.40.0 2025-01-07
3.39.0 2024-10-31
3.38.1 2024-08-20
3.38.0 2024-08-04
3.37.1 2024-05-14
3.37.0 2024-04-16
3.36.1 2024-03-19
3.36.0 2024-02-14
3.35.1 2024-01-20
3.35.0 2023-12-28
3.34.0 2023-12-05
3.33.3 2023-11-19
3.33.2 2023-10-30
3.33.1 2023-10-20
3.33.0 2023-10-01
3.32.2 2023-09-07
3.32.1 2023-08-18
3.32.0 2023-07-27
3.31.1 2023-07-06
3.31.0 2023-06-11
3.30.2 2023-05-06
3.30.1 2023-04-13
3.30.0 2023-04-03
3.29.1 2023-03-13
3.29.0 2023-02-26
3.28.0 2023-02-13
3.27.2 2023-01-18
3.27.1 2022-12-29
3.27.0 2022-12-25
3.26.1 2022-11-13
3.26.0 2022-10-23
3.25.5 2022-10-03
3.25.4 2022-10-02
3.25.3 2022-09-25
3.25.2 2022-09-18
3.25.1 2022-09-07
3.25.0 2022-08-24
3.24.1 2022-07-29
3.24.0 2022-07-25
3.23.5 2022-07-17
3.23.4 2022-07-09
3.23.3 2022-06-25
3.23.2 2022-06-20
3.23.1 2022-06-14
3.23.0 2022-06-13
3.22.8 2022-06-01
3.22.7 2022-05-24
3.22.6 2022-05-22
3.22.5 2022-05-10
3.22.4 2022-05-02
3.22.3 2022-04-28
3.22.2 2022-04-21
3.22.1 2022-04-19
3.22.0 2022-04-15
3.21.1 2022-02-16
3.21.0 2022-02-01
3.20.3 2022-01-15
3.20.2 2022-01-01
3.20.1 2021-12-23
3.20.0 2021-12-15
3.19.3 2021-12-06
3.19.2 2021-11-29
3.19.1 2021-11-02
3.19.0 2021-10-25
3.18.3 2021-10-12
3.18.2 2021-10-05
3.18.1 2021-09-26
3.18.0 2021-09-19
3.17.3 2021-09-09
3.17.2 2021-09-02
3.17.1 2021-09-01
3.17.0 2021-09-01
3.16.4 2021-08-29
3.16.3 2021-08-24
3.16.2 2021-08-17
3.16.1 2021-08-08
3.16.0 2021-07-30
3.15.2 2021-06-29
3.15.1 2021-06-22
3.15.0 2021-06-20
3.14.0 2021-06-05
3.13.1 2021-05-29
3.13.0 2021-05-25
3.12.1 2021-05-08
3.12.0 2021-05-06
3.11.3 2021-05-05
3.11.2 2021-05-03
3.11.1 2021-04-28
3.11.0 2021-04-22
3.10.2 2021-04-19
3.10.1 2021-04-07
3.10.0 2021-03-31
3.9.1 2021-02-28
3.9.0 2021-02-18
3.8.3 2021-01-19
3.8.2 2021-01-03
3.8.1 2020-12-06
3.8.0 2020-11-25
3.7.0 2020-11-06
3.6.5 2020-04-10
3.6.4 2020-01-13
3.6.3 2020-01-10
3.6.2 2020-01-06
3.6.1 2019-12-25
3.6.0 2019-12-18
3.5.0 2019-12-12
3.4.8 2019-12-08
3.4.7 2019-12-02
3.4.6 2019-12-02
3.4.5 2019-11-27
3.4.4 2019-11-27
3.4.3 2019-11-26
3.4.2 2019-11-21
3.4.1 2019-11-12
3.4.0 2019-11-06
3.3.6 2019-10-31
3.3.5 2019-10-28
3.3.4 2019-10-25
3.3.3 2019-10-21
3.3.2 2019-10-14
3.3.1 2019-10-13
3.2.1 2019-08-12
3.2.0 2019-08-08
3.1.4 2019-06-15
3.1.3 2019-05-27
3.1.2 2019-05-21
3.1.1 2019-05-20
3.1.0 2019-05-19
3.0.1 2019-04-06
3.0.0-beta.20 2019-03-17
3.0.0-beta.19 2019-03-14
3.0.0-beta.18 2019-03-09
3.0.0-beta.17 2019-03-09
3.0.0-beta.16 2019-02-18
3.0.0-beta.15 2019-02-09
3.0.0-beta.14 2019-02-07
3.0.0-beta.13 2019-02-04
3.0.0-beta.12 2019-02-02
3.0.0-beta.11 2019-01-27
3.0.0-beta.10 2019-01-22
3.0.0-beta.9 2019-01-17
3.0.0-beta.8 2019-01-10
3.0.0-beta.7 2018-12-27
3.0.0-beta.6 2018-12-18
3.0.0-beta.5 2018-12-11
3.0.0-beta.4 2018-12-04
3.0.0-beta.3 2018-06-07
3.0.0-beta.2 2018-05-26
3.0.0-beta.1 2018-05-19
3.0.0-alpha.4 2018-04-09
3.0.0-alpha.3 2018-03-30
3.0.0-alpha.2 2018-03-27
3.0.0-alpha.1 2018-03-26
3.0.0 2019-03-19
0.0.1 2018-01-03