[1.0.16] - 2026-06-18

🚀 Features

• add option named for invalid return type errors for more places (feat: add option named for invalid return type errors for more places rolldown/rolldown#9846) by @shulaoda
• add option names for invalid return type errors (feat: add option names for invalid return type errors rolldown/rolldown#9821) by @sapphi-red
• transform: infer decorator strictNullChecks from tsconfig (feat(transform): infer decorator strictNullChecks from tsconfig rolldown/rolldown#9590) by @kylecannon
• expose React Compiler options for rolldown and Vite users (feat: expose React Compiler options for rolldown and Vite users rolldown/rolldown#9801) by @Boshen
• tracing: gate chrome-json trace layer behind chrome-tracing feature (feat(tracing): gate chrome-json trace layer behind chrome-tracing feature rolldown/rolldown#9773) by @hyf0
• dev: align test-dev-server with Vite dev server (feat(dev): align test-dev-server with Vite dev server rolldown/rolldown#9668) by @h-a-n-a

🐛 Bug Fixes

• plugin_timings: point doc link to existing checks reference page (fix(plugin_timings): point doc link to existing checks reference page rolldown/rolldown#9837) by @hyf0
• generator: correct contradictory panic message in cjs cross-chunk symbol lookup (fix(generator): correct contradictory panic message in cjs cross-chunk symbol lookup rolldown/rolldown#9836) by @hyf0
• esm: preserve with clause on export * from external (fix(esm): preserve with clause on export * from external rolldown/rolldown#9796) by @hyf0
• Make external_import_binding_merger deterministic (fix: Make external_import_binding_merger deterministic rolldown/rolldown#9755) by @naruaway
• surface invalid manualCodeSplitting group test regex as an error (fix: surface invalid manualCodeSplitting group test regex as an error rolldown/rolldown#9792) by @shulaoda
• avoid panic on output.file without a file name (fix: avoid panic on output.file without a file name rolldown/rolldown#9789) by @shulaoda
• avoid O(N^2) rendering of high-volume diagnostics ([Bug]: Build deadlocks (promise never resolves) when emitting a very high volume of warnings rolldown/rolldown#9748) (fix: avoid O(N^2) rendering of high-volume diagnostics (#9748) rolldown/rolldown#9749) by @IWANABETHATGUY
• avoid panic on JSON numbers outside f64 range (fix: avoid panic on JSON numbers outside f64 range rolldown/rolldown#9788) by @shulaoda
• deps: bump mimalloc-safe to 0.1.63 to fix worker_threads segfault (fix(deps): bump mimalloc-safe to 0.1.63 to fix worker_threads segfault rolldown/rolldown#9785) by @shulaoda
• cache ESM evaluation errors (fix: cache ESM evaluation errors rolldown/rolldown#9784) by @sapphi-red
• wrap node require helper in pure IIFE (fix: wrap node require helper in pure IIFE rolldown/rolldown#9783) by @kb019
• lazy-barrel: load locally-used imports on a re-exported record (fix(lazy-barrel): load locally-used imports on a re-exported record rolldown/rolldown#9757) by @shulaoda
• avoid dangling wrapped-ESM init call across chunks ([Bug]: Dep optimizer: missing init_shared_esm_bundler import in @vue/test-utils chunk when @vue/compiler-dom is split as a CJS-interop sub-chunk rolldown/rolldown#9502) (fix: avoid dangling wrapped-ESM init call across chunks (#9502) rolldown/rolldown#9717) by @IWANABETHATGUY
• dev: detect same-second rewrites in CI poll watcher (fix(dev): detect same-second rewrites in CI poll watcher rolldown/rolldown#9736) by @h-a-n-a
• dev: force rebuild after HMR errors (fix(dev): force rebuild after HMR errors rolldown/rolldown#9686) by @h-a-n-a
• dev: print build errors on browser refresh after a failed build (fix(dev): print build errors on browser refresh after a failed build rolldown/rolldown#9652) by @h-a-n-a

🚜 Refactor

• single-source the chunk $N symbol-naming algorithm (refactor: single-source the chunk $N symbol-naming algorithm rolldown/rolldown#9831) by @Dunqing
• simplify common_dir helper (refactor: simplify common_dir helper rolldown/rolldown#9857) by @IWANABETHATGUY
• drop commondir crate in favor of in-house helper (refactor: drop commondir crate in favor of in-house helper rolldown/rolldown#9849) by @Boshen
• binding: extract helpers from normalize_binding_options (refactor(binding): extract helpers from normalize_binding_options rolldown/rolldown#9842) by @Boshen
• move rolldown_filter_analyzer to tasks and scope oxc cfg feature (refactor: move rolldown_filter_analyzer to tasks and scope oxc cfg feature rolldown/rolldown#9839) by @Boshen
• options: merge manualCodeSplitting into codeSplitting object form (refactor(options): merge manualCodeSplitting into codeSplitting object form rolldown/rolldown#9805) by @IWANABETHATGUY
• options: support codeSplitting object form in CodeSplittingMode (refactor(options): support codeSplitting object form in CodeSplittingMode rolldown/rolldown#9804) by @IWANABETHATGUY
• diagnostic: reuse ByteLocator for per-source line lookup (refactor(diagnostic): reuse ByteLocator for per-source line lookup rolldown/rolldown#9762) by @IWANABETHATGUY
• remove redundant Arc around tracing spans (refactor: remove redundant Arc around tracing spans rolldown/rolldown#9778) by @camc314
• remove unnecessary Arc around sourcemap sender (refactor: remove unnecessary Arc around sourcemap sender rolldown/rolldown#9777) by @camc314
• rolldown_plugin_vite_wasm_fallback: remove the plugin (refactor(rolldown_plugin_vite_wasm_fallback): remove the plugin rolldown/rolldown#9775) by @sapphi-red
• binding: remove infer-able napi(ts_type) (refactor(binding): remove infer-able napi(ts_type) rolldown/rolldown#9737) by @sapphi-red
• remove preprocessor span dedup (refactor: remove preprocessor span dedup rolldown/rolldown#9734) by @hyf0
• identify AST nodes by NodeId instead of Span/Address (refactor: identify AST nodes by NodeId instead of Span/Address rolldown/rolldown#9609) by @IWANABETHATGUY

📚 Documentation

• tsconfig: align auto-discovery docs with oxc-resolver behavior (docs(tsconfig): align auto-discovery docs with oxc-resolver behavior rolldown/rolldown#9845) by @shulaoda
• relocate meta/design to internal-docs, split design from implementation (docs: relocate meta/design to internal-docs, split design from implementation rolldown/rolldown#9826) by @h-a-n-a
• meta: add options normalization design doc (docs(meta): add options normalization design doc rolldown/rolldown#9818) by @IWANABETHATGUY
• document why the napi tracing feature is enabled (docs: document why the napi tracing feature is enabled rolldown/rolldown#9766) by @Boshen
• dev: move test-dev-server test guidance into the testing docs (docs(dev): move test-dev-server test guidance into the testing docs rolldown/rolldown#9809) by @h-a-n-a

⚡ Performance

• drop unused regex unicode property tables from the binding (perf: drop unused regex unicode property tables from the binding rolldown/rolldown#9848) by @Boshen
• drop urlencoding crate in favor of percent-encoding (perf: drop urlencoding crate in favor of percent-encoding rolldown/rolldown#9851) by @Boshen
• drop owo-colors supports-colors feature in vite reporter (perf: drop owo-colors supports-colors feature in vite reporter rolldown/rolldown#9824) by @Boshen
• skip enum member value extraction for non-TypeScript modules (perf: skip enum member value extraction for non-TypeScript modules rolldown/rolldown#9840) by @shulaoda
• rolldown: use unstable sort for itertools sorted_by at unique-key sites (perf(rolldown): use unstable sort for itertools sorted_by at unique-key sites rolldown/rolldown#9827) by @Boshen
• cheaper deterministic ordering in external import binding merger (perf: cheaper deterministic ordering in external import binding merger rolldown/rolldown#9810) by @IWANABETHATGUY
• disable idna's ICU backend by pinning idna_adapter to 1.0.0 (-129 KB) (perf: disable idna's ICU backend by pinning idna_adapter to 1.0.0 (-129 KB) rolldown/rolldown#9811) by @Boshen
• size: use unstable sort where stability is unneeded (perf(size): use unstable sort where stability is unneeded rolldown/rolldown#9803) by @Boshen
• remove num-format dependency from vite reporter (perf: remove num-format dependency from vite reporter rolldown/rolldown#9795) by @Boshen
• reduce js callback error size (perf: reduce js callback error size rolldown/rolldown#9776) by @Boshen
• rolldown_error: remove Debug supertrait from BuildEvent (perf(rolldown_error): remove Debug supertrait from BuildEvent rolldown/rolldown#9798) by @Boshen
• reduce plugin hook order code size (perf: reduce plugin hook order code size rolldown/rolldown#9761) by @Boshen
• deps: disable infer default features to reduce binary size (perf(deps): disable infer default features to reduce binary size rolldown/rolldown#9765) by @Boshen
• reduce pluginable monomorphization size (perf: reduce pluginable monomorphization size rolldown/rolldown#9771) by @Boshen
• avoid rebuilding replace plugin values (perf: avoid rebuilding replace plugin values rolldown/rolldown#9764) by @Boshen
• defer link-stage-output drop to rayon workers after output is produced (perf: defer link-stage-output drop to rayon workers after output is produced rolldown/rolldown#9733) by @Brooooooklyn
• tree-shaking: hoist already-included guard to call sites in inclusion DFS (perf(tree-shaking): hoist already-included guard to call sites in inclusion DFS rolldown/rolldown#9738) by @Brooooooklyn
• renamer: dedup before allocating the owned name in add_symbol_in_root_scope (perf(renamer): dedup before allocating the owned name in add_symbol_in_root_scope rolldown/rolldown#9740) by @Brooooooklyn

🧪 Testing

• allocs: track allocation counts for rolldown_sourcemap (test(allocs): track allocation counts for rolldown_sourcemap rolldown/rolldown#9835) by @hyf0
• bench: add CodSpeed micro-benchmarks for rolldown_sourcemap (test(bench): add CodSpeed micro-benchmarks for rolldown_sourcemap rolldown/rolldown#9834) by @hyf0
• add cjs named export mutation test (test: add cjs named export mutation test rolldown/rolldown#9823) by @sapphi-red
• dev: restore shared-page reliability conventions in AGENTS.md (test(dev): restore shared-page reliability conventions in AGENTS.md rolldown/rolldown#9786) by @h-a-n-a
• dev: add AGENTS.md test guidance for agents (test(dev): add AGENTS.md test guidance for agents rolldown/rolldown#9763) by @h-a-n-a
• dev: split out initial-build-error into its own playground (test(dev): split out initial-build-error into its own playground rolldown/rolldown#9772) by @h-a-n-a
• dev: align e2e suite with Vite and parallelize playgrounds (test(dev): align e2e suite with Vite and parallelize playgrounds rolldown/rolldown#9759) by @h-a-n-a
• remove unnecessary module namespace object JSON serializations in tests (test: remove unnecessary module namespace object JSON serializations in tests rolldown/rolldown#9725) by @sapphi-red
• use assert.deepStrictEqual instead of assert.deepEqual by using assert/strict instead of assert (test: use assert.deepStrictEqual instead of assert.deepEqual by using assert/strict instead of assert rolldown/rolldown#9724) by @sapphi-red
• hmr: add test case for [Bug]: __rolldown_runtime__ is not defined error happens when advancedChunk is used and a non sideeffect module exists rolldown/rolldown#5301 (test(hmr): add test case for #5301 rolldown/rolldown#5302) by @sapphi-red
• dev: add tests for dev-engine principles (test(dev): add tests for dev-engine principles rolldown/rolldown#9720) by @h-a-n-a
• dev: align dev-engine test harness with Vite (test(dev): align dev-engine test harness with Vite rolldown/rolldown#9684) by @h-a-n-a

⚙️ Miscellaneous Tasks

• add rollipop-integration skill by @leegeunhyeok
• update esbuild snap diff metrics by @leegeunhyeok
• sync upstream rolldown v1.1.2 by @leegeunhyeok
• deps: update napi to 3.9.3 (chore(deps): update napi to 3.9.3 rolldown/rolldown#9862) by @shulaoda
• deps: update oxc to 0.137.0 (chore(deps): update oxc to 0.137.0 rolldown/rolldown#9856) by @Boshen
• re-enable default lld linker on x86_64-unknown-linux-gnu (chore: re-enable default lld linker on x86_64-unknown-linux-gnu rolldown/rolldown#9855) by @Boshen
• deps: bump vite-plus to 0.2.1 (chore(deps): bump vite-plus to 0.2.1 rolldown/rolldown#9850) by @Boshen
• skills: translate _config.json when encoding rolldown REPL links (chore(skills): translate _config.json when encoding rolldown REPL links rolldown/rolldown#9847) by @IWANABETHATGUY
• deps: update oxc_resolver and oxc_resolver_napi to 11.21.3 (chore(deps): update oxc_resolver and oxc_resolver_napi to 11.21.3 rolldown/rolldown#9841) by @Boshen
• pin vite-plus (vp) CLI to 0.1.24 in setup-vp (ci: pin vite-plus (vp) CLI to 0.1.24 in setup-vp rolldown/rolldown#9830) by @Boshen
• add crate/package-level CODEOWNERS (chore: add crate/package-level CODEOWNERS rolldown/rolldown#9819) by @IWANABETHATGUY
• drop unused derive_more display feature from rolldown_plugin (chore: drop unused derive_more display feature from rolldown_plugin rolldown/rolldown#9820) by @Boshen
• remove auto-assign PR workflow (chore: remove auto-assign PR workflow rolldown/rolldown#9807) by @IWANABETHATGUY
• deps: update rollup submodule for tests to v4.62.0 (chore(deps): update rollup submodule for tests to v4.62.0 rolldown/rolldown#9780) by @rolldown-guard[bot]
• deps: update esbuild for tests to 0.28.1 (chore(deps): update esbuild for tests to 0.28.1 rolldown/rolldown#9779) by @rolldown-guard[bot]
• deps: update test262 submodule for tests (chore(deps): update test262 submodule for tests rolldown/rolldown#9781) by @rolldown-guard[bot]
• deps: update oxc to 0.136.0 (chore(deps): update oxc to 0.136.0 rolldown/rolldown#9770) by @Boshen
• add pull request template (chore: add pull request template rolldown/rolldown#9756) by @sapphi-red
• clarify rolldown_plugin_vite_* is compatible for the same minor (chore: clarify rolldown_plugin_vite_* is compatible for the same minor rolldown/rolldown#9774) by @sapphi-red
• deps: update github actions (chore(deps): update github actions rolldown/rolldown#9745) by @renovate[bot]
• deps: update rust crates (chore(deps): update rust crates rolldown/rolldown#9747) by @renovate[bot]
• deps: update napi to v3.9.2 (chore(deps): update napi to v3.9.2 rolldown/rolldown#9744) by @renovate[bot]
• deps: update npm packages (chore(deps): update npm packages rolldown/rolldown#9746) by @renovate[bot]
• deps: update @napi-rs/cli and emnapi deps (chore(deps): update @napi-rs/cli and emnapi deps rolldown/rolldown#9741) by @Brooooooklyn
• generator: fix vp fmt on Windows (chore(generator): fix vp fmt on Windows rolldown/rolldown#9727) by @sapphi-red
• ban importing from assert and recommend assert/strict (chore: ban importing from assert and recommend assert/strict rolldown/rolldown#9726) by @sapphi-red