[1.1.2] - 2026-06-18

📝 Notable tsconfig behavior changes

These ship via the oxc_resolver 11.21.3 bump (#9841) and affect resolve.tsconfigPaths (Vite 8 resolves through oxc-resolver):

• Honor explicit non-TS extensions in include (oxc-project/oxc-resolver#1213). compilerOptions.paths now resolve for importers whose extension is explicitly listed in a tsconfig's include (e.g. src/**/*.vue, src/**/*.svelte). Previously oxc-resolver filtered importers by extension before evaluating the include globs, so a .vue/.svelte file listed in include never matched its project and its paths were skipped. This unblocks the default create-vite Vue + TS layout (a solution-style root plus a referenced tsconfig.app.json that declares paths and include: ["src/**/*.ts", "src/**/*.vue"]). Matches vue-tsc and svelte-check, which register these extensions via TypeScript's extraFileExtensions.
• No fallback to the outermost tsconfig in auto-discovery (oxc-project/oxc-resolver#1220). Auto-discovery no longer attaches the topmost ancestor tsconfig.json to a file that no project actually owns (via files / include / project references). Previously such a file inherited the outermost ancestor's paths / baseUrl, leaking aliases into files that project does not own. oxc-resolver now returns no config in that case, matching tsserver / typescript-go, which route such files to an inferred project with no aliases.

🚀 Features

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

🐛 Bug Fixes

• plugin_timings: point doc link to existing checks reference page (#9837) by @hyf0
• generator: correct contradictory panic message in cjs cross-chunk symbol lookup (#9836) by @hyf0
• esm: preserve with clause on export * from external (#9796) by @hyf0
• Make external_import_binding_merger deterministic (#9755) by @naruaway
• surface invalid manualCodeSplitting group test regex as an error (#9792) by @shulaoda
• avoid panic on output.file without a file name (#9789) by @shulaoda
• avoid O(N^2) rendering of high-volume diagnostics (#9748) (#9749) by @IWANABETHATGUY
• avoid panic on JSON numbers outside f64 range (#9788) by @shulaoda
• deps: bump mimalloc-safe to 0.1.63 to fix worker_threads segfault (#9785) by @shulaoda
• cache ESM evaluation errors (#9784) by @sapphi-red
• wrap node require helper in pure IIFE (#9783) by @kb019
• lazy-barrel: load locally-used imports on a re-exported record (#9757) by @shulaoda
• avoid dangling wrapped-ESM init call across chunks (#9502) (#9717) by @IWANABETHATGUY
• dev: detect same-second rewrites in CI poll watcher (#9736) by @h-a-n-a
• dev: force rebuild after HMR errors (#9686) by @h-a-n-a
• dev: print build errors on browser refresh after a failed build (#9652) by @h-a-n-a

🚜 Refactor

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

📚 Documentation

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

⚡ Performance

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

🧪 Testing

• allocs: track allocation counts for rolldown_sourcemap (#9835) by @hyf0
• bench: add CodSpeed micro-benchmarks for rolldown_sourcemap (#9834) by @hyf0
• add cjs named export mutation test (#9823) by @sapphi-red
• dev: restore shared-page reliability conventions in AGENTS.md (#9786) by @h-a-n-a
• dev: add AGENTS.md test guidance for agents (#9763) by @h-a-n-a
• dev: split out initial-build-error into its own playground (#9772) by @h-a-n-a
• dev: align e2e suite with Vite and parallelize playgrounds (#9759) by @h-a-n-a
• remove unnecessary module namespace object JSON serializations in tests (#9725) by @sapphi-red
• use assert.deepStrictEqual instead of assert.deepEqual by using assert/strict instead of assert (#9724) by @sapphi-red
• hmr: add test case for #5301 (#5302) by @sapphi-red
• dev: add tests for dev-engine principles (#9720) by @h-a-n-a
• dev: align dev-engine test harness with Vite (#9684) by @h-a-n-a

⚙️ Miscellaneous Tasks

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

❤️ New Contributors

• @naruaway made their first contribution in #9755
• @kb019 made their first contribution in #9783

Co-authored-by: shulaoda [email protected]