@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

v7.25.7 (2024-10-02)

:bug: Bug Fix

• babel-helper-validator-identifier
  • #16825 fix: update identifier to unicode 16 (@JLHwung)
• babel-traverse
  • #16814 fix: issue with node path keys updated on unrelated paths (@DylanPiercey)
• babel-plugin-transform-classes
  • #16797 Use an inclusion rather than exclusion list for super() check (@nicolo-ribaudo)
• babel-generator
  • #16788 Fix printing of TS infer in compact mode (@nicolo-ribaudo)
  • #16785 Print TS type annotations for destructuring in assignment pattern (@nicolo-ribaudo)
  • #16778 Respect [no LineTerminator here] after nodes (@nicolo-ribaudo)

:nail_care: Polish

• babel-types
  • #16852 Add deprecated JSDOC for fields (@liuxingbaoyu)

:house: Internal

• babel-core
  • #16820 Allow sync loading of ESM when --experimental-require-module (@nicolo-ribaudo)
• babel-helper-compilation-targets, babel-helper-plugin-utils, babel-preset-env
  • #16858 Add browserslist config to external dependency (@JLHwung)
• babel-plugin-proposal-destructuring-private, babel-plugin-syntax-decimal, babel-plugin-syntax-import-reflection, babel-standalone
  • #16809 Archive syntax-import-reflection and syntax-decimal (@nicolo-ribaudo)
• babel-generator
  • #16779 Simplify logic for [no LineTerminator here] before nodes (@nicolo-ribaudo)

:running_woman: Performance

• babel-plugin-transform-typescript
  • #16875 perf: Avoid extra cloning of namespaces (@liuxingbaoyu)
• babel-types
  • #16842 perf: Improve @babel/types builders (@liuxingbaoyu)
  • #16828 Only access BABEL_TYPES_8_BREAKING at startup (@nicolo-ribaudo)