☂️ transformer: ES2024 - ES2016

[Boshen]

Need to implement babel plugins equivalent of

• https://github.com/evanw/esbuild/blob/9c13ae1f06dfa909eb4a53882e3b7e4216a503fe/compat-table/src/index.ts#L350-L399
• https://github.com/evanw/esbuild/blob/9c13ae1f06dfa909eb4a53882e3b7e4216a503fe/compat-table/src/kangax.ts#L20-L85

2024 features

• RegexpSetNotation (See "Regex Features" below) evanw/esbuild@b5ec405

2023 features

• Hashbang (syntax)

2022 features

• ClassField https://babel.dev/docs/babel-plugin-transform-class-properties
• ClassPrivateAccessor https://babeljs.io/docs/babel-plugin-transform-private-methods
• ClassPrivateBrandCheck https://babeljs.io/docs/babel-plugin-transform-private-methods
• ClassPrivateField https://babel.dev/docs/babel-plugin-transform-private-property-in-object
• ClassPrivateMethod https://babel.dev/docs/babel-plugin-transform-private-methods
• ClassPrivateStaticAccessor https://babeljs.io/docs/babel-plugin-transform-private-methods
• ClassPrivateStaticField https://babeljs.io/docs/babel-plugin-transform-private-methods
• ClassPrivateStaticMethod https://babeljs.io/docs/babel-plugin-transform-private-methods
• ClassStaticBlocks https://babel.dev/docs/babel-plugin-transform-class-static-block
• ClassStaticField https://babeljs.io/docs/babel-plugin-transform-class-properties
• TopLevelAwait (syntax)
• RegexpMatchIndices (See "Regex Features" below)
• • ArbitraryModuleNamespaceNames can parse correctly, can emit a warning if required evanw/esbuild@d354bbb

2021 features

• LogicalAssignment https://babel.dev/docs/babel-plugin-transform-logical-assignment-operators @Dunqing feat(transformer): support logical-assignment-operators plugin #4890

2020 features

• Bigint (syntax)
• ExportStarAs (syntax)
• ImportMeta (syntax)
• NullishCoalescing https://babel.dev/docs/babel-plugin-transform-nullish-coalescing-operator feat(transformer): support nullish-coalescing-operator plugin #4884 @Dunqing
• transformer: OptionalChain #6958
• TypeofExoticObjectIsObject minifier feature Minify typeof x !== 'undefined' to typeof x < 'u'
  evanw/esbuild@81215bc

2019 features

• OptionalCatchBinding https://babel.dev/docs/babel-plugin-transform-optional-catch-binding @Dunqing feat(transformer): support optional-catch-binding plugin #4885

2018 features

• AsyncGenerator https://babeljs.io/docs/babel-plugin-transform-async-generator-functions
• ForAwait https://babeljs.io/docs/babel-plugin-transform-async-generator-functions
• transformer: ObjectRestSpread #6959
  • feat(transformer): add object-spread plugin #3133 covered spread, rest not done yet
• RegexpDotAllFlag (See "Regex Features" below)
• RegexpLookbehindAssertions (See "Regex Features" below)
• RegexpNamedCaptureGroups (See "Regex Features" below)
• RegexpUnicodePropertyEscapes (See "Regex Features" below)

2017 features

• AsyncAwait https://babeljs.io/docs/babel-plugin-transform-async-to-generator

2016 features

• ExponentOperator https://babel.dev/docs/babel-plugin-transform-exponentiation-operator feat(transformer): support exponentiation operator plugin #4876 @Dunqing

---

Regex Features

See https://esbuild.github.io/content-types/#javascript #5387

Unsupported regular expression literals are transformed into a new RegExp() constructor call so you can bring your own polyfill library to get them to work anyway.

[Boshen]

This is not a good first issue yet.

[DonIsaac]

Can we add CJS to this list too? I need this for oxc-jest.

[Boshen]

Can we add CJS to this list too? I need this for oxc-jest.

CJS is in the milestone https://github.com/oxc-project/oxc/milestone/6

[Boshen]

The list is not that bad actually, we end up with a few groups:

• regex features - transform to regex constructor
• class stuff - ClassXXX
• syntax sugars
• Async Generator
• Async Await

[overlookmotel]

We had OptionalChain ticked off the list as done. But actually it's not done yet!

ObjectRestSpread was also ticked off, but we've only done half of it.

😢