Babel: v8.0.0-rc.4 Release

v8.0.0-rc.4 (2026-04-29)

:eyeglasses: Spec Compliance

• babel-parser
  • #17954 fix(parser): ts parser small fixes (@JLHwung)
  • #17923 Support flow extends bound (@JLHwung)
  • #17888 TS parser small fixes (@JLHwung)
  • #17865 Fix(parser): flow parser small fixes (@JLHwung)
• babel-generator, babel-parser, babel-plugin-transform-spread, babel-types
  • #17871 Disallow super call after new (@JLHwung)

:boom: Breaking Change

• babel-cli, babel-helper-transform-fixture-test-runner, babel-helpers, babel-node, babel-register
  • #17938 Bundle more packages (@JLHwung)
• babel-traverse
  • #17937 Remove Scope#buildUndefinedNode (@nicolo-ribaudo)
• babel-helper-wrap-function, babel-plugin-transform-block-scoping, babel-plugin-transform-regenerator, babel-traverse
  • #17907 Remove NodePath#toComputedKey (@liuxingbaoyu)
• babel-plugin-external-helpers, babel-template, babel-traverse
  • #17830 Replace remaining whitelist/blacklist with inclusive alternatives (@stuckvgn)
• babel-plugin-transform-property-mutators, babel-standalone
  • #17882 Remove @babel/plugin-transform-property-mutators (@liuxingbaoyu)

:bug: Bug Fix

• babel-register
  • #17928 fix(register): skip hook for ignored files (@JLHwung)
  • #17915 Fix thread synchronization issues in @babel/register (@liuxingbaoyu)
• babel-helper-create-class-features-plugin, babel-plugin-proposal-decorators
  • #17947 Fix decorators interaction with abstract/declare fields (@nicolo-ribaudo)
  • #17931 fix(decorators): replace super within all removed static elements (@JLHwung)
• Other
  • #17940 fix(eslint-plugin): Cleanup references to removed rules (@JLHwung)
• babel-core
  • #17933 Update Babel 8 config item brand (@JLHwung)
• babel-types
  • #17885 Make ArrowFunctionExpression.expression optional (@liuxingbaoyu)

:nail_care: Polish

• babel-register
  • #17941 Uninstall sms in register revert (@JLHwung)
• babel-parser
  • #17902 polish(parser): improve ImportExpression error recovery (@JLHwung)

:memo: Documentation

• #17952 docs: fix exponentiation fixture links (@cyphercodes)

:house: Internal

• Other
  • #17944 refactor(eslint): remove compat layers for ESLint < 9 (@JLHwung)
• babel-core, babel-generator
  • #17880 chore: Remove unused merging source map code (@liuxingbaoyu)

Committers: 6

• Babel Bot (@babel-bot)
• Huáng Jùnliàng (@JLHwung)
• Nicolò Ribaudo (@nicolo-ribaudo)
• Rayan Salhab (@cyphercodes)
• Sam Tucker-Davis (@stuckvgn)
• @liuxingbaoyu