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fix(oxfmt): non idempotent formatting on comments in TS#20449

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leaysgur merged 3 commits intooxc-project:mainfrom
CatChen:03-16-fixed_20219
Apr 13, 2026
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fix(oxfmt): non idempotent formatting on comments in TS#20449
leaysgur merged 3 commits intooxc-project:mainfrom
CatChen:03-16-fixed_20219

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@CatChen CatChen commented Mar 17, 2026

Fixed #20219.

Testing

Run cargo test -p oxc_formatter "issue_20219".

@CatChen CatChen requested a review from Dunqing as a code owner March 17, 2026 04:49
@CatChen CatChen force-pushed the 03-16-fixed_20219 branch from 299e813 to 3cb15dd Compare March 17, 2026 04:49
@github-actions github-actions Bot added A-formatter Area - Formatter C-bug Category - Bug labels Mar 17, 2026
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codspeed-hq Bot commented Mar 17, 2026

Merging this PR will degrade performance by 3.14%

❌ 1 regressed benchmark
✅ 43 untouched benchmarks
⏩ 7 skipped benchmarks1

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation mangler[RadixUIAdoptionSection.jsx_keep_names] 19.6 µs 20.2 µs -3.14%

Comparing CatChen:03-16-fixed_20219 (942bc88) with main (a17a08a)2

Open in CodSpeed

Footnotes

  1. 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.

  2. No successful run was found on main (3746946) during the generation of this report, so a17a08a was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

@CatChen CatChen force-pushed the 03-16-fixed_20219 branch 2 times, most recently from 5d14348 to 182d866 Compare April 1, 2026 06:01
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Please add test cases to oxc_formatter/test/fixtures.

https://github.com/oxc-project/oxc/tree/main/crates/oxc_formatter/tests

@CatChen CatChen force-pushed the 03-16-fixed_20219 branch from 182d866 to 942bc88 Compare April 11, 2026 05:48
@CatChen CatChen requested a review from leaysgur April 11, 2026 05:51
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Thanks!

@leaysgur leaysgur merged commit 2871fc2 into oxc-project:main Apr 13, 2026
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leaysgur added a commit that referenced this pull request Apr 13, 2026
graphite-app Bot pushed a commit that referenced this pull request Apr 13, 2026
camc314 pushed a commit that referenced this pull request Apr 13, 2026
# Oxlint
### 💥 BREAKING CHANGES

- 382958a span: [**BREAKING**] Remove re-exports of string types from
`oxc_span` crate (#21246) (overlookmotel)
- c4aedfa str: [**BREAKING**] Add `static_ident!` macro (#21245)
(overlookmotel)
- 7354f3c linter: [**BREAKING**] Error on no matched files (#21144)
(camc314)

### 🚀 Features

- 91f2c79 linter/eslint-jest-plugin: Implemented
`prefer-importing-jest-globals` rule (#21303) (Said Atrahouch)
- a02f32c linter: Add release version for existing rules (#21363)
(camchenry)
- b9e93da linter: Allow tagging rules with release version (#21362)
(camchenry)
- f99ecda oxlint: Gate `vite.config.ts` recognition behind `VP_VERSION`
env var (#21298) (leaysgur)
- cf459d3 linter: Implement suggestion for `no-empty-function` rule
(#21347) (Mikhail Baev)
- 7213d61 linter: Adding pending suggestions fix to `valid_expect`
rules. (#21249) (Said Atrahouch)
- ae45312 linter: Introduce `--type-check-only` flag (#21184) (camc314)
- 1ce8b90 linter: Implemented `valid-expect-in-promise` vitest and jest
rule (#21170) (Said Atrahouch)
- 39f7fda linter: Add auto-fix to `unicorn/prefer-default-parameters`
(#21166) (yefan)
- 15574bc linter/unicorn: Implement consistent-template-literal-escape
(#21126) (AliceLanniste)
- c5c8c03 linter/prefer-readonly-parameter-types: Move rule from nursery
to pedantic (#21114) (camc314)
- 1893be1 linter/no-useless-default-assignment: Move rule from nursery
to correctness (#21113) (camc314)
- 5462ff9 linter/strict-void-return: Move rule from nursery to pedantic
(#21115) (camc314)
- c2989bd linter/no-unnecessary-type-parameters: Move rule from nursery
to suspicious (#21112) (camc314)
- 79d339a linter/no-unnecessary-qualifier: Move rule from nursery to
style (#21111) (camc314)

### 🐛 Bug Fixes

- b577efc linter/unicorn: Handle optional chaining in
`prefer-array-flat` and `no-invalid-remove-event-listener` (#21299)
(Mikhail Baev)
- 5e55735 oxlint/lsp: Skip .git directories in LSP walkers (#21316)
(camc314)
- ec7f6ed oxlint, oxfmt: Apply `check_for_writer_error` to `.flush()`
(#21343) (Craig Morrison)
- a17a08a linter/no-useless-assignment: Handle continue edges in loop
analysis (#21358) (camc314)
- a0eac12 linter/array-type: Move match to first stmt (#21357) (camc314)
- 1b3abc3 linter: Exclude boundary tokens from JSXText whitespace check
in isSpaceBetweenTokens (#21313) (bab)
- ecbcf5e linter: More info to summary output for GitHub formatter
(#21330) (Théo LUDWIG)
- a0a8c62 linter/no-fallthrough: Check from start of switch case for
empty lines (#21324) (Josh Cartmell)
- 36f0bc4 linter/no-cycle: Report all cyclic dependencies inside a file
(#21259) (camc314)
- 3f80536 linter: Ignore regex flags other than `g`/`u`/`v` in
`prefer-string-replace-all` (#21203) (bab)
- f21d3aa linter/unicorn: Report on optional in
`require-number-to-fixed-digits-argument` rule (#21207) (Mikhail Baev)
- af8e122 linter: Render each config error as a separate diagnostic
(#21120) (bab)
- a950f55 linter/unicorn: Do not report on optionals in
`no-single-promise-in-promise-methods` (#21157) (Mikhail Baev)
- 472f8ee linter: Mark complete comment for unused disable directives +
lsp fix (#21092) (copilot-swe-agent)
- edd0865 linter/no-array-index-key: False positive when index is inside
an expression within a template literal (#21123) (bab)
- 7e8d520 linter/unicorn: Report on optional `foo?.postMessage` in
`require-post-message-target-origin` rule (#21104) (Mikhail Baev)

### ⚡ Performance

- addcd02 napi/parser, linter/plugins: Raw transfer deserializer for
`Vec`s use shift instead of multiply where possible (#21142)
(overlookmotel)
- 3068ded napi/parser, linter/plugins: Shift before add when calculating
positions in raw transfer deserializer (#21141) (overlookmotel)
- eb400b8 napi/parser, linter/plugins: Remove `uint32` buffer view
(#21140) (overlookmotel)
- 7a86613 linter/plugins: Use `Int32Array`s for tokens and comments
buffers (#21136) (overlookmotel)
- 8c51121 napi/parser, linter/plugins: Raw transfer deserialize `Span`
fields as `i32`s (#21135) (overlookmotel)
- bc1bcdd napi/parser, linter/plugins: Inline trivial raw transfer field
deserializers into node object definitions (#21134) (overlookmotel)
- c0278ab napi/parser, linter/plugins: Use `Int32Array` in raw transfer
deserializer (#21132) (overlookmotel)
- 43482c7 linter/plugins: Use `>>` not `>>>` in binary search loops
(#21129) (overlookmotel)

### 📚 Documentation

- 7888280 linter: Move config docs for `no-restricted-exports` (#21360)
(camchenry)
- 162d26c linter: Improve docs for `typescript/array-type` (#21356)
(camchenry)
- a2dbaec linter: Add missing docs for options for
`typescript/class-literal-property-style` (#21355) (camchenry)
- 79593eb linter: Improve docs for
`typescript/consistent-type-assertions` (#21353) (camchenry)
- f9d20d2 linter: Move config option docs for
`typescript/no-empty-object-type` (#21352) (camchenry)
- a8f650d linter: Add missing config option docs for
`prefer-string-start-ends-with` (#21332) (camchenry)
- cfd8a4f linter: Don't rely on old eslint doc for available globals
(#21334) (Nicolas Le Cam)
- 03865fa linter: Jest/prefer-snapshot-hint: add doc comment for
snapshot hint mode (#21290) (camchenry)
- a6fe09b linter: Add missing docs for config options in `react` plugin
(#21289) (camchenry)
- 60eaf47 linter: Add missing docs for config options in unicorn plugin
(#21288) (camchenry)
- c3c2055 linter: `jsx-a11y/label-has-associated-control`: document the
`assert` options (#21287) (camchenry)
- a928ed9 linter: Add missing config docs for vitest plugin rules
(#21285) (camchenry)
- 7e07c7c linter: `id-length`: move enum docs to doc comments (#21281)
(camchenry)
- 9746bdf linter: Add missing docs for `class-methods-use-this` config
(#21278) (camchenry)
- 6ffe7a5 linter: Move docs for `Target` variant onto enum (#21277)
(camchenry)
- 305350d linter/plugins: Correct comments (#21130) (overlookmotel)
# Oxfmt
### 💥 BREAKING CHANGES

- 382958a span: [**BREAKING**] Remove re-exports of string types from
`oxc_span` crate (#21246) (overlookmotel)

### 🚀 Features

- e3081e1 oxfmt: Gate `vite.config.ts` recognition behind `VP_VERSION`
env var (#21295) (leaysgur)
- 5b0b573 oxfmt: Update prettier to 3.8.2 (#21294) (leaysgur)
- 0d67834 oxfmt: Show hint for all files are ignored case (#21154)
(leaysgur)

### 🐛 Bug Fixes

- 2871fc2 oxfmt: Non idempotent formatting on comments in TS (#20449)
(Cat Chen)
- ec7f6ed oxlint, oxfmt: Apply `check_for_writer_error` to `.flush()`
(#21343) (Craig Morrison)
- 1a8c225 formatter: Preserve newline between self-closing JSX element
and single-char text (#21149) (Justin Mecham)
- 407b725 oxfmt: Indent dangling comments in empty enum with block
indent (#21163) (Leonabcd123)
- d13fd37 formatter: Remove extra outer parentheses on return with JSDoc
type cast (#21109) (bab)
- 22babde oxfmt: Fix unicode char escaping (#21162) (leaysgur)
- 4da53e5 formatter: Preserve trailing comma in TSX arrow functions with
default type params (#21151) (Justin Mecham)
- 94fe774 oxfmt: Handle paths with consecutive leading slashes (#21155)
(leaysgur)
- 50c389b oxfmt: Support `.editorconfig` `quote_type` (#20989)
(leaysgur)

### ⚡ Performance

- 0ce619f formatter: Use `Allocator::alloc_concat_strs_array` instead of
`StringBuilder::from_strs_array_in` (#21339) (overlookmotel)
@CatChen CatChen deleted the 03-16-fixed_20219 branch April 15, 2026 01:33
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formatter: non idempotent formatting on comments in TS

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