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‎CHANGELOG.md‎

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# Changelog
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### Unreleased
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- Improved performance of `atob`, `btoa`, `Uint8Array.fromHex`, `Uint8Array.prototype.setFromHex`, and `Uint8Array.prototype.toHex`, [#1503](https://github.com/zloirock/core-js/issues/1503), [#1464](https://github.com/zloirock/core-js/issues/1464), [#1510](https://github.com/zloirock/core-js/issues/1510)
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- Nothing
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### [3.49.0 - 2026.03.16](https://github.com/zloirock/core-js/releases/tag/v3.49.0)
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- Changes [v3.48.0...v3.49.0](https://github.com/zloirock/core-js/compare/v3.48.0...v3.49.0) (373 commits)
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- [`Iterator.range`](https://github.com/tc39/proposal-iterator.range) updated following the actual spec version
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- Throw a `RangeError` on `NaN` `start` / `end` / `step`
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- Allow `null` as `optionOrStep`
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- Improved accuracy of `Math.{ asinh, atanh }` polyfills with big and small values
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- Improved accuracy of `Number.prototype.toExponential` polyfills with big and small values
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- Improved performance of `atob`, `btoa`, `Uint8Array.fromHex`, `Uint8Array.prototype.setFromHex`, and `Uint8Array.prototype.toHex`, [#1503](https://github.com/zloirock/core-js/issues/1503), [#1464](https://github.com/zloirock/core-js/issues/1464), [#1510](https://github.com/zloirock/core-js/issues/1510), thanks [**@johnzhou721**](https://github.com/johnzhou721)
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- Minor performance optimization polyfills of methods from [`Map` upsert proposal](https://github.com/tc39/proposal-upsert)
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- Polyfills of methods from [`Map` upsert proposal](https://github.com/tc39/proposal-upsert) from the pure version made generic to make it work with polyfilled and native collections
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- Wrap `Symbol.for` in `Symbol.prototype.description` polyfill for correct handling of empty string descriptions

‎README.md‎

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### Installation:[⬆](#index)
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```sh
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// global version
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npm install --save core-js@3.48.0
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npm install --save core-js@3.49.0
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// version without global namespace pollution
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npm install --save core-js-pure@3.48.0
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npm install --save core-js-pure@3.49.0
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// bundled global version
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npm install --save core-js-bundle@3.48.0
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npm install --save core-js-bundle@3.49.0
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```
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### `postinstall` message[⬆](#index)
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#### `@babel/preset-env`[⬆](#index)
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[`@babel/preset-env`](https://github.com/babel/babel/tree/master/packages/babel-preset-env) has `useBuiltIns` option, which optimizes the use of the global version of `core-js`. With `useBuiltIns` option, you should also set `corejs` option to the used version of `core-js`, like `corejs: '3.48'`.
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[`@babel/preset-env`](https://github.com/babel/babel/tree/master/packages/babel-preset-env) has `useBuiltIns` option, which optimizes the use of the global version of `core-js`. With `useBuiltIns` option, you should also set `corejs` option to the used version of `core-js`, like `corejs: '3.49'`.
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> [!IMPORTANT]
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> It is recommended to specify the used minor `core-js` version, like `corejs: '3.48'`, instead of `corejs: 3`, since with `corejs: 3` will not be injected modules which were added in minor `core-js` releases.
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> It is recommended to specify the used minor `core-js` version, like `corejs: '3.49'`, instead of `corejs: 3`, since with `corejs: 3` will not be injected modules which were added in minor `core-js` releases.
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---
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var array = Array.of(1, 2, 3);
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```
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By default, `@babel/preset-env` with `useBuiltIns: 'usage'` option only polyfills stable features, but you can enable polyfilling of proposals by the `proposals` option, as `corejs: { version: '3.48', proposals: true }`.
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By default, `@babel/preset-env` with `useBuiltIns: 'usage'` option only polyfills stable features, but you can enable polyfilling of proposals by the `proposals` option, as `corejs: { version: '3.49', proposals: true }`.
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> [!IMPORTANT]
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> In the case of `useBuiltIns: 'usage'`, you should not add `core-js` imports by yourself, they will be added automatically.
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"env": {
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"targets": "> 0.25%, not dead",
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"mode": "entry",
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"coreJs": "3.48"
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"coreJs": "3.49"
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}
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}
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```

‎deno/corejs/README.md‎

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*Example*:
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```js
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import 'https://deno.land/x/corejs@v3.48.0/index.js'; // <- at the top of your entry point
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import 'https://deno.land/x/corejs@v3.49.0/index.js'; // <- at the top of your entry point
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Object.hasOwn({ foo: 42 }, 'foo'); // => true
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