# Oxc crates_v0.141.0 — oxc crates_v0.141.0

- Product: Oxc (https://whatsnew.fyi/product/oxc)
- Vendor: Oxc
- Date: 2026-07-21
- Version: crates_v0.141.0
- Original notes: https://github.com/oxc-project/oxc/releases/tag/crates_v0.141.0
- Permalink: https://whatsnew.fyi/product/oxc/releases/crates-v0.141.0

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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- **removed** — Move `IdentBuildHasher` to `oxc_str` crate
- **changed** — Split `MetaProperty` into `ImportMeta` and `NewTarget`
- **added** — Merge combined assign expression in conditional expression
- **added** — Merge assign expression against member expression in conditional expression
- **added** — Add `Vec::from_raw_parts_in` to allocator
- **added** — Add context notes for strict assignments in semantic
- **added** — Add `implements!` macro to data_structures
- **added** — Add `const_str_eq` function to data_structures
- **added** — Add context notes for reserved keyword diagnostic in semantic
- **added** — Provide more friendly error for spread element in dynamic imports
- **added** — Drop last break from last switch case in minifier
- **added** — Remove unreachable recursive functions in minifier
- **added** — Allow `NONE` to be passed to AST builder methods where `Option<ArenaVec>` is expected
- **added** — Accept arrays for `ArenaVec` params of AST builder methods
- **added** — Implement `FromIn` for array to `Vec` conversion in allocator
- **added** — Track heap deallocs, alloc bytes, and peak growth in track-memory-allocations
- **changed** — Move JSX entity decoder to `oxc_syntax`
- **added** — Export `Str` as `ArenaStr` in str crate
- **added** — Expand switch optimization to remove empty cases in minifier
- **added** — Add `ParseOptions::enable_ident_hashes`
- **fixed** — Avoid reordering this before super in minifier

###### 💥 BREAKING CHANGES

- 5293431 str: [**BREAKING**] Move `IdentBuildHasher` to `oxc_str` crate (#24717) (overlookmotel)
- 54cc121 ast: [**BREAKING**] Split `MetaProperty` into `ImportMeta` and `NewTarget` (#24557) (camc314)

###### 🚀 Features

- 87823d0 minifier: Merge combined assign expression in conditional expression (#24707) (sapphi-red)
- 03a54c9 minifier: Merge assign expression against member expression in conditional expression (#24706) (sapphi-red)
- effd3c8 allocator: Add `Vec::from_raw_parts_in` (#24732) (overlookmotel)
- ddacf61 semantic: Add context notes for strict assignments (#24728) (camc314)
- 7e9b84a data_structures: Add `implements!` macro (#24721) (overlookmotel)
- 39e141b data_structures: Add `const_str_eq` function (#24720) (overlookmotel)
- cc3d17f semantic: Add context notes for reserved keyword diagnostic (#24715) (camc314)
- 4c71560 parser: More friendly error for spread element in dynamic imports (#24705) (sapphi-red)
- 7b045cd minfier: Drop last break from last switch case (#24673) (Armano)
- 7d3c178 minifier: Remove unreachable recursive functions (#24125) (Dunqing)
- 94f99b3 ast: Allow `NONE` to be passed to AST builder methods where `Option<ArenaVec>` is expected (#24629) (overlookmotel)
- 77230c5 ast: Accept arrays for `ArenaVec` params of AST builder methods (#24621) (overlookmotel)
- f08b152 allocator: Implement `FromIn` for array to `Vec` conversion (#24620) (overlookmotel)
- 2338c13 track-memory-allocations: Track heap deallocs, alloc bytes, and peak growth (#24619) (Boshen)
- 7aa4739 syntax,transformer: Move JSX entity decoder to `oxc_syntax` (#24617) (camc314)
- 2b097c4 str: Export `Str` as `ArenaStr` (#24604) (overlookmotel)
- 3acf4c1 minifier: Expand switch optimiation to remove empty cases (#24520) (Armano)
- 129b759 parser: Improve diagnostics for unparenthesized LHS on exponential expr (#24569) (camc314)
- 4d0c601 minifier: Fold arithmetic over undefined and null operands (#24485) (Dunqing)
- 91541dd minifier: Drop empty switch statements  (#24527) (Armano)
- d05224d ast_visit: Generate VisitJs visitor that skips TypeScript type-space (#24499) (Boshen)
- 3d22307 parser: Add `ParseOptions::enable_ident_hashes` (#24491) (Boshen)

###### 🐛 Bug Fixes

- 61e02bf minifier: Avoid reordering this before super (#24755) (Dunqing)
- 79e6d77 minifier: Preserve RegExp feature detection (#24712) (Dunqing)
- 47ddedf semantic: Allow arguments in ambient declarations (#24758) (camc314)
- 9f3e300 react_compiler: Preserve aliasing diagnostic locations (#24757) (Boshen)
- 4b81f4d react_compiler: Honor default suppressions (#24747) (Boshen)
- 6cc4a34 codegen: Wrap negative BigInt literal base of `**` in parentheses (#23621) (Jerry Zhao)
- d85276c minifier: Avoid incorrect logical assignment transformation when base object may be mutated (#24718) (sapphi-red)
- 99b1dc4 isolated-declarations: Separate static accessors (#24716) (camc314)
- 76ec104 semantic: Resolve import-equals namespaces (#22696) (camc314)
- 0ffa88e str: Enable `hashbrown` feature `inline-more` (#24719) (overlookmotel)
- 0e9b460 isolated-declarations: Normalize accessor keys (#24690) (Cameron)
- 64c2241 minifier: Align class heritage removal with assumptions (#24533) (Dunqing)
- 48b59f4 parser: Span ambient generator diagnostics (#24711) (camc314)
- e750a82 ecmascript: Fix false negative for may_have_side_effects on dynamic property access (#24709) (sapphi-red)
- f145d73 minifier: Guard reordered identifier reads (#24698) (Dunqing)
- a2ef382 isolated-declarations: Reject `window.Symbol`  as global symbol reference (#24689) (camc314)
- b1bcf72 minifier: Invalidate facts for redeclared bindings (#24658) (Dunqing)
- 921b834 minifier: Don't treat a conditionally-assigned var as write-once (#24650) (Dunqing)
- 061af1f minifier: Avoid stale pure function summaries (#24636) (Dunqing)
- 40c2f43 allocator: `Vec::from_array_in` do not allocate zero-length array (#24628) (overlookmotel)
- 70994ae codegen: Preserve comments before expression

_[Truncated at 4000 characters — full notes: https://github.com/oxc-project/oxc/releases/tag/crates_v0.141.0]_