v1.0.3

## [1.0.3] - 2026-05-27

### 🚀 Features

- transform: respect decorator strictNullChecks option (#9580) by @kylecannon
- drop `defer` keyword (#9503) by @TheAlexLichter

### 🐛 Bug Fixes

- ci: create target dir before cargo release-oxc update (#9584) by @shulaoda
- ci: reorder prepare-release steps to avoid dirty git check failure (#9583) by @shulaoda
- testing: canonicalize temp dir early and use platform-specific separator in test262 (#9582) by @shulaoda
- testing: resolve symlinked temp dir in test262 snapshot normalization (#9581) by @shulaoda
- testing: canonicalize temp dir path in test262 snapshot normalization (#9579) by @shulaoda
- dev: `onOutput` called twice when initial build fails (#9552) by @hyf0
- dev: make `ensureCurrentBuildFinish` not returning error when engine closes (#9564) by @h-a-n-a
- oxc-runtime: route require() to CJS helper variant (#9263) (#9526) by @IWANABETHATGUY
- generator: use exporter chunk's export mode for CJS default re-exports (#9299) (#9529) by @IWANABETHATGUY
- rolldown: always run reduced-atom static cycle check (#9441) (#9514) by @IWANABETHATGUY
- apply transform.dropLabels before scanning (#9521) (#9522) by @IWANABETHATGUY
- rolldown_watcher: take `rolldown` dep through the workspace (#9510) by @Boshen
- cache: keep the scan-stage cache consistent when a build fails (#9495) by @h-a-n-a
- skip JSON default-import namespace optimization for write targets (#9484) (#9489) by @IWANABETHATGUY
- deps: skip pnpm frozen-lockfile on Netlify to dodge catalog mismatch bug (#9471) by @Boshen

### 🚜 Refactor

- oxc-runtime: use Cow for helper path construction (#9538) by @IWANABETHATGUY
- fold import defer phase drop into PreProcessor (#9524) by @IWANABETHATGUY
- distinguish `map: null` vs `map: undefined` in transform hook output (#9497) by @sapphi-red

### 📚 Documentation

- explain the policy for Rust crates (#9547) by @sapphi-red
- cache: add design doc for cache (#9544) by @h-a-n-a
- guide/troubleshooting: add TDZ error section (#9537) by @sapphi-red
- dev-engine: add design doc for dev-engine (#9479) by @h-a-n-a
- lazy-barrel: tweak some words (#9483) by @shulaoda
- lazy-barrel: expand reasoning behind LARGE_BARREL_MODULES advice (#9477) by @shulaoda

### ⚡ Performance

- generate: thread ast_table by value into codegen consumer (#9555) by @Boshen
- finalizers: replace `_reExport` construction with a direct call to avoid calling `clone_in` (#9501) by @Dunqing
- reorder hot-path boolean checks to short-circuit on cheap predicates first (#9523) by @Boshen

### 🧪 Testing

- rolldown: regression fixture for #9401 (#9418) by @IWANABETHATGUY
- failing test for #9441 (#9504) by @TheAlexLichter

### ⚙️ Miscellaneous Tasks

- deps: upgrade oxc to 0.133.0 (#9563) by @Dunqing
- deps: update crate-ci/typos action to v1.46.3 (#9576) by @renovate[bot]
- deps: update mimalloc-safe to 0.1.62 (#9577) by @shulaoda
- mimalloc-safe: update to a bug-fix branch for verification (#9569) by @shulaoda
- deps: update test262 submodule for tests (#9551) by @rolldown-guard[bot]
- point published crates' readme to root README.md (#9553) by @Boshen
- replace actions-cool/issues-helper with gh CLI (#9543) by @Boshen
- deps: update cargo-shear to 1.12.4 (#9541) by @Boshen
- deps: update taiki-e/install-action action to v2.79.4 (#9535) by @renovate[bot]
- deps: update github actions (#9532) by @renovate[bot]
- deps: update rust crates (#9534) by @renovate[bot]
- deps: update npm packages (#9533) by @renovate[bot]
- gate experimental/testing-only items to silence dead_code in publish builds (#9517) by @Boshen
- docs: deploy to Void (#9509) by @Boshen
- release: set up cargo-release-oxc for publishing crates (#9476) by @Boshen
- rolldown_plugin_lazy_compilation: add missing description (#9507) by @Boshen
- mimalloc-safe: update to a bug-fix branch for verification (#9506) by @shulaoda
- deps: update crate-ci/typos action to v1.46.2 (#9468) by @renovate[bot]

### ❤️ New Contributors

* @kylecannon made their first contribution in [#9580](https://github.com/rolldown/rolldown/pull/9580)