@babel/compat-data

What is @babel/compat-data?

The @babel/compat-data package provides data about the environment features that Babel can target. It includes information about browser and JavaScript engine versions that support various ECMAScript features. This data is used by Babel to determine which transformations and polyfills are necessary for a given target environment.

What are @babel/compat-data's main functionalities?

Environment Data Retrieval

Retrieve compatibility data for the last two versions of browsers. This is used in Babel's preset-env to determine which transformations/polyfills are needed.

"last 2 versions"

Specific Feature Data

Get data about a specific ECMAScript feature, such as arrow functions, to see which environments support it natively.

"es6.arrow-functions"

Other packages similar to @babel/compat-data

core-js-compat

Provides compatibility data for core-js, a library that includes polyfills for ECMAScript features. It is similar to @babel/compat-data but focuses on the features polyfilled by core-js.

caniuse-lite

A lighter version of caniuse-db, containing browser support tables for front-end technologies. It is similar to @babel/compat-data in that it provides compatibility data, but it is more general and not specific to Babel's needs.

browserslist

A tool for sharing target browsers and Node.js versions between different front-end tools. It is similar to @babel/compat-data in that it helps determine which environments to target, but it does not provide specific feature support data.

README

@babel/compat-data

See our website @babel/compat-data for more information.

Install

Using npm:

npm install --save @babel/compat-data

or using yarn:

yarn add @babel/compat-data

Changelog

v7.18.8 (2022-07-08)

:eyeglasses: Spec Compliance

• babel-parser, babel-types
  • #14730 Misc fixes to @babel/types AST definitions (@JLHwung)

:bug: Bug Fix

• babel-plugin-transform-parameters
  • #14736 Inject IIFE when variables shadow binding in rest param (@nicolo-ribaudo)
• babel-plugin-transform-classes
  • #14709 Fix compilation of nested super(...) calls (@dbacarel)
• babel-plugin-transform-for-of, babel-plugin-transform-spread, babel-traverse, babel-types
  • #14393 Support some TSTypes in the inferrer (@JLHwung)
• babel-helper-module-transforms, babel-plugin-transform-modules-commonjs
  • #14708 Unshadow cjs exports when transforming mutations (@nicolo-ribaudo)

:memo: Documentation

• #14486 Fix test debugging instructions for contributors (@conartist6)

:house: Internal

• babel-types
  • #14737 fix: deep clone shared AST field definitions (@JLHwung)
• Other
  • #14720 fix: support compiling monorepo on single-core CPU machines (@JLHwung)
• babel-helper-fixtures, babel-parser
  • #12619 Add json schema of fixture runner options (@JLHwung)

:microscope: Output optimization

• babel-plugin-transform-typescript
  • #14723 [optimizeConstEnums] Inline const enum if only exported as type (@nicolo-ribaudo)