perf(formatter): optimize RegExpLiteral formatting to avoid heap allocations by Dunqing · Pull Request #17797 · oxc-project/oxc

Dunqing · 2026-01-08T10:29:16Z

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Dunqing · 2026-01-08T10:29:44Z

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codspeed-hq · 2026-01-08T10:33:37Z

Merging this PR will not alter performance

Summary

✅ 38 untouched benchmarks
⏩ 7 skipped benchmarks¹

_{Comparing 01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations (95e7eb5) with main (18c071e)²}

7 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
No successful run was found on main (b4ed879) during the generation of this report, so 18c071e was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

Dunqing · 2026-01-09T15:12:37Z

Merge activity

Jan 9, 3:12 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Jan 9, 3:12 PM UTC: Dunqing added this pull request to the Graphite merge queue.
Jan 9, 3:26 PM UTC: Merged by the Graphite merge queue.

…cations (#17797)

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# Oxlint ### 🚀 Features - 9699a1b linter/prefer-global-this: Add suggestion (#17873) (Mikhail Baev) - 51c2815 linter/no-invalid-regexp: Add labels and help text to flag diagnostics (#17865) (camchenry) - 344d77d linter/no-ex-assign: Improve diagnostic with more detail (#17864) (camchenry) - 7d280e0 linter: Add fixer for `unicorn/no-useless-error-capture-stack-trace` rule (#17839) (Mikhail Baev) - af1d0e3 linter/prefer-optional-chain: Add rule (#17831) (camc314) - e3c4108 vscode: Add more supported languages to extension (#17812) (Alexander Lichter) - 4a46678 vscode: Activate extension on more languages (#17717) (Sysix) - b1298fc vscode: Sync formatter with supported files (#17615) (Alexander Lichter) - c7f0848 linte/rno-required-prop-with-default: Implement suggestion (#17747) (Minsu Lee) - 0e8127e linter/vue: Implement no-lifecycle-after-await (#17701) (yefan) - 3567304 linter/vitest: Implement `consistent-each-for` (#17601) (Said Atrahouch) - 883e156 linter: Add fixer for `unicorn/no-useless-collection-argument` rule (#17594) (Mikhail Baev) - 4eb335c linter/vitest: Implemented prefer-called-once (#17674) (Said Atrahouch) - 2bd2d5a linter/vitest: Implement hoisted-apis-on-top (#17658) (Said Atrahouch) - cfb2bcc linter/vue: Implement no-arrow-functions-in-watch (#17672) (yefan) - a68208a linter/eslint-plugin-vitest: Implements `prefer-describe-function-title` (#17677) (Said Atrahouch) - efa029f linter/vitest: Implement no-unneeded-async-expect-function (#17494) (Minsu Lee) ### 🐛 Bug Fixes - 49cf66e lsp: Fix workspace worker selection for nested and similar-named workspaces (#17853) (Copilot) - 84f4f3c linter: Add doc url for tsgolint diagnostics (#17879) (Sysix) - 76c903f linter/consistent-indexed-object-style: Skip fixing default exported interface (#17874) (Copilot) - 7e87d16 linter/tabindex-no-positive: Improve diagnostic phrasing (#17849) (connorshea) - 28f9fba vscode: Fix nested search for binaries (#17832) (Sysix) - 8ca2cd2 linter: Move jsx-a11y/no-static-element-interactions rule to nursery. (#17818) (connorshea) - dc9fdd6 linter/consistent-indexed-object-style: Re-port test cases and fix some bugs (#17802) (camc314) - 7bbd880 linter: Update prefer-destructuring rule metadata (#17642) (Hamir Mahal) - 3c45185 linter/consistent-indexed-object-style: False positive with circular reference (#17789) (heygsc) - bd186b4 vscode: Search for `oxlint` and `oxfmt` in every workspace directory (#17760) (Sysix) - 3e0dff7 linter/no-hooks: Add punctuation to diagnostic message (#17751) (camc314) - 6ae21f9 linter/prefer-called-once: Avoid panic on trailing comma (#17735) (Said Atrahouch) - 32c3901 oxlint: Do not panic on invalid `no-unused-vars` configuration (#17719) (Sysix) - 59a6228 parser: Detect TS1363 error for type-only imports with mixed default and named/namespace bindings (#17712) (Copilot) ### ⚡ Performance - f87a1e2 linter: Check for giving reserved plugin name before calling `load_plugin` on napi side (#17841) (Sysix) ### 📚 Documentation - a2b3a24 linter/no-caller: Improve docs and diagnostic for rule. (#17890) (connorshea) - aa48247 linter/no-unsafe-finally: Improve rule docs. (#17891) (connorshea) - 1b0bdee linter: Tweak docs for no-useless-constructor and hoisted-apis-on-top (#17888) (connorshea) - 8f24fa9 vscode: Remove mention of a built-in server (#17836) (Sysix) - e81a306 linter: Update the tsconfig flag mention for the import plugin. (#17778) (connorshea) # Oxfmt ### 🚀 Features - 539b350 formatter/sort_imports: Update `NODE_BUILTINS` modules (#17771) (nilptr) - 2e03ebf oxfmt/lsp: Use `SourceFormatter` to support non-JS files and napi features (#17655) (leaysgur) - 623f7eb oxfmt/sort_package_json: Use `options.sort_scripts` (#17740) (leaysgur) - 86c0168 oxfmt/sort_package_json: Handle `oxfmtrc.sort_scripts` option (#17738) (leaysgur) - 256636a oxfmt/lsp: Add `.editorconfig` to `get_watcher_patterns` (#17694) (leaysgur) - 3f3db39 oxfmt/lsp: Use `ConfigResolver` to align with CLI (#17654) (leaysgur) ### 🐛 Bug Fixes - fdd1e1e formatter: Don't wrap parenthesis for type assertion when it's an declaration of export default (#17878) (Dunqing) - f0813ad formatter: Incorrect type annotation check for short argument (#17877) (Dunqing) - 9e89389 formatter/tailwindcss: Nested class string doesn't respect `singleQuote: true` (#17838) (Dunqing) - e2f534c formatter/sort_imports: Handle alignable comment with JsLabels (#17791) (leaysgur) - f0cedd4 formatter/tailwindcss: Class name is broken after sorting when its contains single quotes with `singleQuote: true` (#17790) (Dunqing) - 1864142 oxfmt/tailwindcss: Bundle `prettier/plugins/*` (#17782) (leaysgur) - 3a9d43b oxfmt: Ignore explicit positional path which is ignored by directory (#17732) (leaysgur) - 0563217 formatter: Classes will be stripped out when both `experimentalTailwindcss` and `experimentalSortImports` are enabled (#17726) (Dunqing) ### ⚡ Performance - d1bc514 formatter: Optimize RegExpLiteral formatting to avoid heap allocations (#17797) (Dunqing) ### 📚 Documentation - 62b7a01 formatter: Clarify `experimentalTailwindcss` configuration comments (#17898) (Dunqing) Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>

github-actions bot added A-formatter Area - Formatter C-performance Category - Solution not expected to change functional behavior, only performance labels Jan 8, 2026

Sysix changed the title ~~perf(foramtter): optimize RegExpLiteral formatting to avoid head allocations~~ perf(formatter): optimize RegExpLiteral formatting to avoid head allocations Jan 8, 2026

Dunqing changed the title ~~perf(formatter): optimize RegExpLiteral formatting to avoid head allocations~~ perf(formatter): optimize RegExpLiteral formatting to avoid heap allocations Jan 9, 2026

leaysgur approved these changes Jan 9, 2026

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graphite-app bot changed the base branch from 01-08-refactor_formatter_remove_unnecessary_maybeoptionalsemicolon to graphite-base/17797 January 9, 2026 08:39

graphite-app bot force-pushed the 01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations branch from 8c3eec3 to b62a192 Compare January 9, 2026 08:47

graphite-app bot force-pushed the graphite-base/17797 branch from d3406f9 to b4ed879 Compare January 9, 2026 08:47

graphite-app bot changed the base branch from graphite-base/17797 to main January 9, 2026 08:47

graphite-app bot force-pushed the 01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations branch from b62a192 to 95e7eb5 Compare January 9, 2026 08:48

Dunqing added the 0-merge Merge with Graphite Merge Queue label Jan 9, 2026

perf(formatter): optimize RegExpLiteral formatting to avoid heap allo…

d1bc514

…cations (#17797)

graphite-app bot force-pushed the 01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations branch from 95e7eb5 to d1bc514 Compare January 9, 2026 15:20

Copilot AI review requested due to automatic review settings January 9, 2026 15:20

Copilot AI reviewed Jan 9, 2026

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graphite-app bot merged commit d1bc514 into main Jan 9, 2026
20 checks passed

graphite-app bot deleted the 01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations branch January 9, 2026 15:26

graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Jan 9, 2026

Boshen mentioned this pull request Jan 12, 2026

release(apps): oxlint v1.39.0 && oxfmt v0.24.0 #17921

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perf(formatter): optimize RegExpLiteral formatting to avoid heap allocations#17797

perf(formatter): optimize RegExpLiteral formatting to avoid heap allocations#17797
graphite-app[bot] merged 1 commit intomainfrom
01-08-perf_foramtter_optimize_regexpliteral_formatting_to_avoid_head_allocations

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How to use the Graphite Merge Queue

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Merging this PR will not alter performance

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Dunqing commented Jan 8, 2026 •

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