@babel/preset-flow 8.0.0-rc.5

on Node.js NPM

v8.0.0-rc.5 (2026-05-12)

👓 Spec Compliance

• babel-parser
  • #17949 Disallow decorators on abstract/declare fields (@nicolo-ribaudo)

💥 Breaking Change

• babel-code-frame, babel-core, babel-parser, babel-traverse
  • #17849 fix(code-frame): use 0-based columns to match Babel AST locations (#1… (@nehemiyawicks)
• All packages
  • #17969 Require Node.js ^22.18.0 || >=24.11.0 (@nicolo-ribaudo)
• babel-plugin-transform-object-set-prototype-of-to-assign, babel-standalone
  • #17958 Remove transform-object-set-prototype-of-to-assign (@liuxingbaoyu)
• babel-standalone
  • #17963 Remove noop plugins from @babel/standalone (@liuxingbaoyu)

📢 Deprecation

• babel-plugin-transform-arrow-functions, babel-plugin-transform-classes, babel-plugin-transform-computed-properties, babel-plugin-transform-destructuring, babel-plugin-transform-for-of, babel-plugin-transform-modules-amd, babel-plugin-transform-modules-commonjs, babel-plugin-transform-modules-umd, babel-plugin-transform-nullish-coalescing-operator, babel-plugin-transform-object-rest-spread, babel-plugin-transform-optional-chaining, babel-plugin-transform-parameters, babel-plugin-transform-private-methods, babel-plugin-transform-private-property-in-object, babel-plugin-transform-spread, babel-plugin-transform-template-literals
  • #17972 Deprecate spec and loose plugin options (@liuxingbaoyu)

🐛 Bug Fix

• babel-helper-globals
  • #17981 fix(helper-globals): Update browser-upper.json (@JLHwung)
• babel-plugin-transform-modules-systemjs
  • #17973 fix(systemjs): improve module string name support (@JLHwung)

📝 Documentation

• #17977 Add threat model to SECURITY.md (@nicolo-ribaudo)

🏠 Internal

• babel-core, babel-helper-create-class-features-plugin, babel-plugin-proposal-decorators, babel-plugin-transform-async-to-generator, babel-plugin-transform-class-static-block, babel-plugin-transform-flow-strip-types, babel-plugin-transform-modules-amd, babel-plugin-transform-modules-systemjs, babel-plugin-transform-typescript, babel-preset-env, babel-preset-flow, babel-preset-react, babel-preset-typescript
  • #17957 Add testing for plugin options (@liuxingbaoyu)
• Other
  • #17950 refactor(ts): migrate babel-eslint-plugin-* to TS (@JLHwung)

Committers: 6

• Babel Bot (@babel-bot)
• Huáng Jùnliàng (@JLHwung)
• Nehemiya Wickramasinghe (@nehemiyawicks)
• Nicolò Ribaudo (@nicolo-ribaudo)
• @liuxingbaoyu
• @orbisai0security