crates_v0.155.0
oxc-project/oxccrates_v0.155.0Oct 19, 2026by github-actions[bot]
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AI Summary
This release introduces significant breaking changes to the AST and transformer layer regarding Unicode handling (lone surrogates), adds new minification optimizations, and includes various performance improvements in the code generation and minification crates.
Key Highlights
- Breaking changes to handle lone surrogates in JSX and AST property/member names
- New minification optimizations including array join minimization and De Morgan's law
- Performance improvements in codegen and diagnostics speed
Breaking Changes
- Decode JSX entities to lone surrogates
- Preserve lone surrogates in static property names
- Preserve lone surrogates in static member names
New Features
- Minimize array join expression
- Generate node ID setters for enums
- Add de Morgan optimization for void expressions
Full Release Notes
### 💥 BREAKING CHANGES - c7d229b transformer: [**BREAKING**] Decode JSX entities to lone surrogates (#26712) (Dunqing) - e3c1b11 ast: [**BREAKING**] Preserve lone surrogates in static property names (#27095) (Dunqing) - a0a987c ast: [**BREAKING**] Preserve lone surrogates in static member names (#26677) (Dunqing) ### 🚀 Features - 7bb2697 minifier: Minimize array join expression (#27905) (Armano) - 5d91db8 ast: Generate node ID setters for enums (#27500) (camc314) - 6b5057b minifier: Add de morgan optimization for void expressions (#27375) (Armano) ### 🐛 Bug Fixes - ce6a088 minifier: Fold string indices by UTF-16 code unit (#27096) (Dunqing) - 7c47246 linter: Check module specifiers and string values that contain lone surrogates (#26717) (Dunqing) - 782ab6e linter: Search string values without UTF-8 conversion (#26716) (Dunqing) - a5d8184 jsdoc: Parse code spans after quotes in descriptions (#27955) (leaysgur) - bd37e78 ecmascript: Look through sequence expressions in `to_primitive` (#27837) (baltasarblanco) - d92789d minifier: Drop debugger statements in unbraced bodies (#27867) (camc314) - 863b359 ecmascript: Correct parseFloat decimal prefix scanning (#27695) (camc314) - a2534c6 minifier: Preserve lexical initializers in dead for loops (#27676) (camc314) - 3543672 ecmascript: Do not fold Number.isInteger / isSafeInteger of tiny non-integers to true (#27622) (Baltasar Blanco) - 6987a61 ecmascript: BigInt loose equality folding (unknown operands and `StringToBigInt`) (#27656) (Baltasar Blanco) - 40e5644 minifier: Preserve indirect access when folding into call targets (#27082) (waltu) - 022306f ecmascript: Do not fold `Math.cbrt` of a negative number to `NaN` (#27621) (Baltasar Blanco) ### ⚡ Performance - faa75d8 transformer: Remove redundant scratch vectors (#27922) (camc314) - 88b5c35 minifier: Reduce code branches when evaluating roots (#27906) (Armano) - fe1d367 codegen: Remove branches from loops printing arrays (#27840) (overlookmotel) - 7bb6b62 codegen: Reduce hashmap lookups in `print_annotation_comment` (#27845) (overlookmotel) - 31ffd08 codegen: Avoid unnecessary comment clone (#27843) (overlookmotel) - a6456b7 codegen: Remove branch from `print_space_before_identifier` (#27842) (overlookmotel) - eeff416 codegen: Simplify `print_space_before_identifier` (#27841) (overlookmotel) - 5d877b8 diagnostics: Speed up zero-context span lookups (#27770) (camc314) - 2ab6b63 packages/codegen: Remove redundant `printSpaceBeforeIdentifier` and `last` updates in `printParams` (#27652) (overlookmotel) - e533278 codegen: Reduce writes in `printDecorators` (#27651) (overlookmotel) ### 📚 Documentation - 29caafd codegen: Format table in doc comment (#27839) (overlookmotel) - 3de03c1 packages/codegen: Correct outdated comments (#27838) (overlookmotel)
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