Core-js NPM | npm.io

logo

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

Modular standard library for JavaScript. Includes polyfills for ECMAScript up to 2023: 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.resolve(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]

(function * (i) { while (true) yield i++; })(1)
  .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.resolve(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]

(function * (i) { while (true) yield i++; })(1)
  .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.resolve(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.from(function * (i) { while (true) yield i++; }(1))
  .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 global version (first 2 examples), for more info see core-js documentation.

babel-runtime @storybook/ui babel-polyfill babel-register @babel/polyfill react-app-polyfill @storybook/addon-knobs @storybook/semver apollo-env @babel/runtime-corejs2 @wynskm/demo-rui @wj.cao/components @wj.cao/menu @wj.cao/table @wj.cao/tag-textarea @xh/hoist @xizhe/web-bootstrap 1yongsh-fe yd-business-components yfk-kit yoyuo-scripts vue2.0-ui-w-test vue2-solo-ui vue2-cyberpunk_ui vue2-taichi_ui vue3-fitty vue3-nre vustys wjian1-ui yangqianli zzh-component-vue zzh-component-vue-test @cargos/cargong vue-gcode-viewer vue-alga-animation vue-button-chengzhang vue-drag-and-resize vue-components-utils vue-harry-world vue-plugin-msg-hellowords vue-pithy-cropper vue-plugins-msg-gqs vue-plugins-msg-ifelse vue-plugins-msg-yrt vue-plugins-xiaolun vue-msgs-lixiang vue-msg-maidami vue-msg-menghanv1.0 vue-msg-neve-two vue-msg-ningmeng-oy vue-msg-plugin-rongma vue-msg-sijitx vue-msg-start-kn vue-msg-suihaijiao vue-msg-tan-ten vue-msg-xiaofengtx vue-msg-xiaoxiaobojue vue-msg-xinghuo vue-msg-xmyf vue-msg-yasuo vue-msg-zhenglm vue-msg-zmm1210 vue-qianyu-vuemsg vue-test-msg-bgy vue-nxp-plugin vue-npm-yk vue-todo-to-npm vue-msg-baiyun vue-msg-feier vue-msg-jiajue waafipay_adminportal.pkg web-studio wingchaincase wipo-ui-angular-app wj2111 wmr-ui-test wpycmp ws-shuju-npm ws-grocery-npm xaas-fe xiaoli-lego-bricks xiaoliu-ui xk-dialog yucode-ui yup-ui zal-vue-demo-header-web zane-select-city yan-ui-test xrwebui xyvue-fe zf_cs zhlib-test zjjk-charts zj-vue-ui zm-components @bovik_/ui-chemu-test-labtary zheshiwo-jintianshanfg vue3-test-simple vubo vuepress-plugin-dice-roller

3 days ago

1 month ago

2 months ago

2 months ago

3 months ago

4 months ago

5 months ago

7 months ago

6 months ago

6 months ago

5 months ago

9 months ago

8 months ago

7 months ago

10 months ago

10 months ago

12 months ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

2 years ago

2 years ago

1 year ago

1 year ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

4 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

5 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

6 years ago

7 years ago

7 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

8 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

9 years ago

10 years ago

10 years ago

10 years ago

10 years ago

10 years ago

11 years ago