# Oxc crates_v0.143.0 — oxc crates_v0.143.0

- Product: Oxc (https://whatsnew.fyi/product/oxc)
- Vendor: Oxc
- Date: 2026-08-06
- Version: crates_v0.143.0
- Original notes: https://github.com/oxc-project/oxc/releases/tag/crates_v0.143.0
- Permalink: https://whatsnew.fyi/product/oxc/releases/crates-v0.143.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Return borrowed JSDoc so the parse cache works
- **removed** — Remove `ArenaBox::dangling` method
- **changed** — Store single parameter in `TSIndexSignature::parameter`
- **changed** — Change `TSIndexSignatureName::name` to `Ident`
- **added** — Introduce `ExportDeclaration`, `ExportFromDeclaration`
- **added** — Introduce `ArrowFunctionBody` enum
- **removed** — Remove conversion to `Box` from AST builder methods
- **changed** — Make `Box` `Send` + `Sync` when the type it contains is
- **added** — Derive `GetSpan` for `Comment`
- **added** — Generate minifier scope collector
- **added** — Skip transparent TS expressions
- **added** — Add React Compiler transform binding
- **added** — Fold safe integer exponentiation
- **added** — Enable termination statement optimization for do while
- **added** — Fold safe integer division and remainder
- **fixed** — Preserve if-chain idempotency and correct side effects when alternate should not be moved
- **fixed** — Do not treat lone-surrogate strings as constants
- **fixed** — Strip re-export attributes
- **fixed** — Report export imports in namespaces
- **fixed** — Preserve nonfatal diagnostics in React Compiler

###### 💥 BREAKING CHANGES

- 4120da0 semantic: [**BREAKING**] Return borrowed JSDoc so the parse cache works (#25186) (Connor Shea)
- f0a41c8 allocator: [**BREAKING**] Remove `ArenaBox::dangling` method (#25236) (overlookmotel)
- 067da8c ast: [**BREAKING**] Store single parameter in `TSIndexSignature::parameter` (#25154) (camc314)
- a0c7788 ast: [**BREAKING**] Change `TSIndexSignatureName::name` to `Ident` (#25150) (camc314)
- 1bdedd1 ast: [**BREAKING**] Introduce `ExportDeclaration`, `ExportFromDeclaration` (#25095) (camc314)
- c917f20 ast: [**BREAKING**] Introduce `ArrowFunctionBody` enum (#24987) (camc314)
- 7e1199c ast: [**BREAKING**] Remove conversion to `Box` from AST builder methods (#25038) (overlookmotel)

###### 🚀 Features

- 3c8312e allocator: Make `Box` `Send` + `Sync` when the type it contains is (#25242) (overlookmotel)
- cb5bc08 ast: Derive `GetSpan` for `Comment` (#25147) (leaysgur)
- 8541e18 ast_tools: Generate minifier scope collector (#25088) (camc314)
- 5acdae2 ecmascript: Skip transparent TS expressions (#25072) (camc314)
- 85d0f4d napi: Add React Compiler transform binding (#24934) (Boshen)
- 70d6ece minifier: Fold safe integer exponentiation (#25009) (Dunqing)
- 73fc747 minifier: Enable termination statement optimization for do while (#24921) (Armano)
- 5eadfdb minifier: Fold safe integer division and remainder (#24981) (Dunqing)

###### 🐛 Bug Fixes

- 6c9ee14 minifier: Preserve if-chain idempotency and correct side effects when alternate should not be moved (#25041) (Armano)
- 8a47ff3 ecmascript: Do not treat lone-surrogate strings as constants (#25084) (Dunqing)
- 468b970 isolated-declarations: Strip re-export attributes (#25090) (camc314)
- a70035d parser: Report export imports in namespaces (#25086) (camc314)
- 5d8ccf5 react_compiler: Preserve nonfatal diagnostics (#25066) (Boshen)
- d349e4a react_compiler: Match eslint suppression gating (#25068) (Boshen)
- 0dc16ba react_compiler: Track catch block declarations (#25067) (Boshen)
- e6734a5 minifier: Fold typeof comparisons with known object strings (#25017) (Dunqing)
- 3a9d5a5 minifier: Keep `typeof foo == ['object']` as-is (#24941) (sapphi-red)
- 10ec276 ast: Custom AST builder methods take `IntoIn<ArenaBox>` where child method does (#25033) (overlookmotel)
- fbe8d31 minifier: Respect targets when folding RegExp source (#24790) (Dunqing)

###### ⚡ Performance

- fb402b0 minifier: Stop re-deriving printed numeric spellings (#25103) (Dunqing)
- 7251e52 react_compiler: Avoid large types on stack (#25037) (overlookmotel)
- e07718f isolated_declarations: Avoid large types on stack (#25036) (overlookmotel)
- 9fb1e3e transformer: Avoid large types on stack (#25035) (overlookmotel)
- 8b80f8b parser: Avoid large types on stack (#25034) (overlookmotel)

###### 📚 Documentation

- 2ea0aa9 ast: Correct grammar in AST builder methods doc comments (#25173) (overlookmotel)