# Oxc crates_v0.145.0 — oxc crates_v0.145.0

- Product: Oxc (https://whatsnew.fyi/product/oxc)
- Vendor: Oxc
- Date: 2026-08-18
- Version: crates_v0.145.0
- Original notes: https://github.com/oxc-project/oxc/releases/tag/crates_v0.145.0
- Permalink: https://whatsnew.fyi/product/oxc/releases/crates-v0.145.0

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** — printSync return an object instead of a string
- **changed** — Alter capitalization of sourceFilename option
- **added** — Add full source map support
- **added** — Expose property name mangling options in napi/minify
- **added** — Add property name mangling to minifier
- **added** — Deduplicate private accessor names in mangler
- **added** — Add Relay transform plugin to napi
- **added** — Add oxc-codegen package
- **fixed** — Validate sourcemap options in codegen
- **fixed** — Skip node_modules by default in react_compiler
- **fixed** — Drop side-effect-free additions in minifier
- **fixed** — Accept RegExp for property filters in napi/minify
- **fixed** — Reject invalid indent options in codegen
- **fixed** — Preserve undefined for defaulted any in isolated-declarations
- **fixed** — Preserve property key annotations in codegen
- **fixed** — Model uninitialized module vars as undefined in minifier
- **fixed** — Fold ** with Number::exponentiate, not IEEE pow in ecmascript
- **fixed** — Handle ambient expando properties in isolated-declarations

###### 💥 BREAKING CHANGES

- 365274e packages/codegen: [**BREAKING**] `printSync` return an object (#25720) (overlookmotel)

###### 🚀 Features

- 6a7eb60 packages/codegen: Alter capitalization of `sourceFilename` option (#25854) (overlookmotel)
- 300763f packages/codegen: Add full source map support (#25585) (camc314)
- a169e4a napi/minify: Expose property name mangling options (#24741) (Dunqing)
- 2f5cdb1 minifier: Add property name mangling (#24740) (Dunqing)
- 4922141 mangler: Deduplicate private accessor names (#25601) (camc314)
- 1c4f519 napi: Add Relay transform plugin (#25503) (Boshen)
- a4478e9 codegen: Add `oxc-codegen` package (#25488) (overlookmotel)

###### 🐛 Bug Fixes

- 0fbcf64 codegen: Validate sourcemap options (#25860) (camc314)
- 345f981 react_compiler: Skip node_modules by default (#25859) (Boshen)
- ab81f3f minifier: Drop side-effect-free additions (#25639) (Dunqing)
- 241c559 napi/minify: Accept RegExp for property filters (#25827) (Dunqing)
- 4cc7ea4 codegen: Reject invalid indent options (#25807) (camc314)
- 53f9295 isolated-declarations: Preserve undefined for defaulted any (#25292) (camc314)
- 8ab883a codegen: Preserve property key annotations (#25766) (Dunqing)
- b13fd48 minifier: Model uninitialized module vars as undefined (#25497) (Dunqing)
- f6000ac ecmascript: Fold `**` with `Number::exponentiate`, not IEEE `pow` (#25644) (Kotaro Chikuba)
- b846abc isolated-declarations: Handle ambient expando properties (#25655) (camc314)
- dec0a86 react-compiler: Standardize diagnostics (#25702) (Boshen)
- fca2e0c parser: Reject initialized lexical declarations in for-in (#25700) (Boshen)
- ae9be8f parser: Forbid type parameters on quoted constructors (#25696) (Boshen)
- c5f188a react-compiler: Use Babel v1 validation defaults (#25676) (Boshen)
- db44651 napi: Disable reuseWorker in browser bindings (#25640) (leaysgur)
- ce35d47 react_compiler: Preserve JSX import source pragmas (#25592) (Boshen)
- 059784d semantic: Respect shadowed `Infinity` and `NaN` in enum evaluation (#25604) (camc314)
- bb5a232 minifier: Keep variable declaration initilized with class when keepNames is enabled (#25584) (sapphi-red)
- f49229d minifier: Keep side effects when rotating bitwise operands (#25596) (Kotaro Chikuba)
- e82495b ecmascript: Derive `ToNumber` of `!x` from `ToBoolean` (#25595) (Kotaro Chikuba)
- 509931b semantic: Classify global references per identifier (#25608) (camc314)
- 80484ce mangler: Correct base54 safety comment (#25606) (camc314)
- c1369a7 codegen: Resolve private names in class heritage (#25588) (camc314)
- c002f29 codegen: Escape sources for empty import specifiers (#25586) (camc314)
- 0c68b7f estree: Emit `decorators` on `FormalParameterRest` (#25582) (camc314)
- cdf1846 semantic: Allow legacy escapes in JSX attributes (#25576) (Boshen)
- e75e102 minifier: Preserve block statement in labeled iteration statements (#25162) (Armano)
- 771d79a mangler: Exclude non-manglable symbols from slot assignment (#25539) (sapphi-red)
- 76b19f5 minifier: Avoid duplicating large folded strings (#25532) (Dunqing)
- 59e8895 codegen: Validate starting indent level (#25550) (camc314)
- 88b34f2 clippy: Remove unneeded `unsafe` (#25551) (camc314)
- 23a7ad0 parser: Stop delimited lists at end of file (#25542) (Boshen)
- 73acba9 parser: Preserve fatal errors during await reparse (#25541) (Boshen)
- c3e99d1 minifier: Avoid invalid octal escapes in template folds (#25495) (Dunqing)
- b4e6a9e codegen: Output newline after `export default interface` (#25487) (overlookmotel)
- 5fcf683 minifier: Correct issue with try finally termination (#25185) (Armano)
- 1645d93 react_compiler: Preserve source spans (#25462) (Boshen)
- 8d7f9cf react_compiler: Honor eslint suppressions (#25394) (Boshen)

###### ⚡ Performance

- 568203e ecmascript: Use binary search for known globals (#25817) (Boshen)
- c84ede3 estree_tokens: Share JS token update entry point (#25826) (Boshen)
- 9a6e862 minifier: Move owned statements directly (#25835) (Dunqing)
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_[Truncated at 4000 characters — full notes: https://github.com/oxc-project/oxc/releases/tag/crates_v0.145.0]_