# core-js-bundle
> Standard library
Latest version **3.50.0** (published 2026-08-05) · MIT license · 0 weekly downloads
## Install
```sh
npm install core-js-bundle
pnpm add core-js-bundle
yarn add core-js-bundle
bun add core-js-bundle
```
## Health
**Score 60/100 (C)** — status: active.
Positive: no vulnerabilities; recently updated; high maintenance score; popular repo.
Warnings: low downloads; no types; no esm support.
## Facts
| | |
|---|---|
| Version | 3.50.0 |
| Published | 2026-08-05 |
| First published | 2018-03-26 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Node | * |
| Dependencies | 0 |
| Unpacked size | 1.6 MB |
| Known vulnerabilities | 0 |
| Install scripts | yes |
| GitHub stars | 25534 |
| Author | Denis Pushkarev |
| Maintainers | zloirock |
| Keywords | 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 |
## Links
- npm: https://www.npmjs.com/package/core-js-bundle
- Repository: https://github.com/zloirock/core-js
- Homepage: https://core-js.io
- Issues: https://github.com/zloirock/core-js/issues
- Funding: https://opencollective.com/core-js
- npm.io page: https://npm.io/package/core-js-bundle
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## Recent versions
- 3.50.0 (latest) — 2026-08-05
- 3.0.0-beta.20 (beta) — 2019-03-17
- 3.0.0-alpha.4 (alpha) — 2018-04-09
- 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
- … 150 more at https://npm.io/package/core-js-bundle/versions
## README
[](https://opencollective.com/core-js) [](https://github.com/zloirock/core-js/blob/master/CONTRIBUTING.md) [](https://www.npmjs.com/package/core-js-bundle)
**I highly recommend reading this: [So, what's next?](https://github.com/zloirock/core-js/blob/master/docs/2023-02-14-so-whats-next.md)**
---
> [`core-js`](https://core-js.io) is a modular standard library for JavaScript. Includes polyfills for ECMAScript up to 2026: [promises](https://core-js.io/docs/features/ecmascript/promise), [symbols](https://core-js.io/docs/features/ecmascript/symbol), [collections](https://core-js.io/docs/features/ecmascript/collections), [iterators](https://core-js.io/docs/features/ecmascript/iterator), [typed arrays](https://core-js.io/docs/features/ecmascript/typed-arrays), many other features, ECMAScript proposals, some cross-platform WHATWG / W3C features and proposals like [`URL`](https://core-js.io/docs/features/web-standards/url-and-urlsearchparams). 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**](https://opencollective.com/core-js), [**Patreon**](https://patreon.com/zloirock), [**Boosty**](https://boosty.to/zloirock), **Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz )**, [**Alipay**](https://user-images.githubusercontent.com/2213682/219464783-c17ad329-17ce-4795-82a7-f609493345ed.png).
---
---
---
[*Example of usage*](https://tinyurl.com/28zqjbun):
```js
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*:
```js
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*:
```js
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 bundled global version, for more info see [`core-js` documentation](https://core-js.io).**
---
_Source: https://npm.io/package/core-js-bundle · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._