@babel/runtime-corejs3

What is @babel/runtime-corejs3?

The @babel/runtime-corejs3 package is a runtime library for Babel that includes polyfills for ECMAScript features using core-js version 3. It is used alongside Babel to enable the use of new JavaScript features in environments that do not natively support them. This package helps to avoid polluting the global scope and reduces the size of the compiled code by deduplicating helper functions.

What are @babel/runtime-corejs3's main functionalities?

Polyfilling ECMAScript features

This code imports polyfills for stable ECMAScript features and the regenerator runtime needed to use generators and async functions.

import 'core-js/stable';
import 'regenerator-runtime/runtime';

Usage of built-in methods

This code demonstrates how to use the map method from core-js through the runtime without polluting the global Array prototype.

import { map } from '@babel/runtime-corejs3/core-js-stable/instance/map';

let arr = [1, 2, 3];
let mapped = map.call(arr, x => x * x);

Usage of new syntax features

This code shows how to use the helpers provided by @babel/runtime-corejs3 to work with new syntax features like async functions and generators.

import _asyncToGenerator from '@babel/runtime-corejs3/helpers/asyncToGenerator';
import _regeneratorRuntime from '@babel/runtime-corejs3/regenerator';

const asyncFunc = _asyncToGenerator(function* () {
  yield Promise.resolve('Hello World');
});

Other packages similar to @babel/runtime-corejs3

core-js

core-js is a modular standard library for JavaScript, including polyfills for ECMAScript up to 2021. It's similar to @babel/runtime-corejs3 but does not require Babel to work and can be included directly in any JavaScript project.

regenerator-runtime

regenerator-runtime is a standalone runtime for Regenerator-compiled generator and async functions. It is similar to the regenerator part of @babel/runtime-corejs3 but does not include other polyfills or helpers.

@babel/polyfill

Deprecated in favor of separate core-js and regenerator-runtime packages, @babel/polyfill was a package that included Babel's polyfills for ECMAScript features. It was similar to @babel/runtime-corejs3 but was designed to be included globally rather than modularly.

README

@babel/runtime-corejs3

babel's modular runtime helpers with core-js@3 polyfilling

See our website @babel/runtime-corejs3 for more information.

Install

Using npm:

npm install --save @babel/runtime-corejs3

or using yarn:

yarn add @babel/runtime-corejs3

Changelog

v7.26.0 (2024-10-25)

:rocket: New Feature

• babel-core, babel-generator, babel-parser, babel-plugin-syntax-import-assertions, babel-plugin-syntax-import-attributes, babel-preset-env, babel-standalone, babel-types
  • #16850 Enable import attributes parsing by default (@nicolo-ribaudo)
• babel-core
  • #16862 feat: support async plugin's pre/post (@timofei-iatsenko)
• babel-compat-data, babel-plugin-proposal-regexp-modifiers, babel-plugin-transform-regexp-modifiers, babel-preset-env, babel-standalone
  • #16692 Add transform-regexp-modifiers to preset-env (@JLHwung)
• babel-parser
  • #16849 feat: add startIndex parser option (@DylanPiercey)
• babel-generator, babel-parser, babel-plugin-syntax-flow
  • #16841 Always enable parsing of Flow enums (@nicolo-ribaudo)
• babel-helpers, babel-preset-typescript, babel-runtime-corejs3
  • #16794 Support import() in rewriteImportExtensions (@liuxingbaoyu)
• babel-generator, babel-parser
  • #16708 Add experimental format-preserving mode to @babel/generator (@nicolo-ribaudo)

:bug: Bug Fix

• babel-core
  • #16928 Workaround Node.js bug for parallel loading of TLA modules (@nicolo-ribaudo)
  • #16926 Fix loading of modules with TLA in Node.js 23 (@nicolo-ribaudo)

:nail_care: Polish

• babel-plugin-proposal-json-modules, babel-plugin-transform-json-modules, babel-standalone
  • #16924 Rename proposal-json-modules to transform-json-modules (@nicolo-ribaudo)

:house: Internal

• babel-code-frame, babel-highlight
  • #16896 Inline @babel/highlight in @babel/code-frame (@nicolo-ribaudo)
• babel-generator, babel-parser, babel-types
  • #16732 Add kind to TSModuleDeclaration (@liuxingbaoyu)

:running_woman: Performance

• babel-helper-module-transforms, babel-plugin-transform-modules-commonjs
  • #16882 perf: Improve module transforms (@liuxingbaoyu)