fix(formatter): handle comments after pipe in single-member union types#21487
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leaysgur merged 4 commits intooxc-project:mainfrom Apr 17, 2026
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When a single-member union type has own-line comments between the pipe and the first member, the formatter's hug shortcut incorrectly activates because it only checked for comments before the union's span start, missing comments between | and the member. Extend both the hug-shortcut guard and the leading comment collection to detect comments at the first member's span start for single-member unions at the alias level. Guard against parenthesized and nested union types to avoid regressions in complex cases. Closes oxc-project#21399
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Fixes clippy::map_unwrap_or lint warning.
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/oxfmt-ecosys |
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Oxfmt Ecosystem CI
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(I may update the comment and do some refactoring later but,) Thank you very much! |
This was referenced Apr 20, 2026
camc314
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Apr 20, 2026
# Oxlint ### 💥 BREAKING CHANGES - 24fb7eb allocator: [**BREAKING**] Rename `Box` and `Vec` methods (#21395) (overlookmotel) ### 🚀 Features - 38d8090 linter/jest: Implemented jest `version` settings in config file. (#21522) (Said Atrahouch) - 7dbbb99 linter/eslint: Implement suggestion for `no-case-declarations` rule (#21508) (Mikhail Baev) - 9b4d9f6 linter/prefer-template: Implement autofix (#21502) (François) - daa64ed linter/no-empty-pattern: Add `allowObjectPatternsAsParameters` option (#21474) (camc314) - cf2d281 linter/typescript: Implement explicit-member-accessibility (#21447) (Hunter Tunnicliff) - d48de6f linter/unicorn: Add help messages to 3 rule diagnostics (#21459) (Mukunda Rao Katta) - cffdc2e linter: Backfill rule version metadata (#21391) (Old Autumn) ### 🐛 Bug Fixes - 1e69b91 linter/no-useless-assignment: Improve diagnostic spans (#21581) (camc314) - f272594 linter/plugins: Align `RuleMeta.replacedBy` type with ESLint (#21544) (bab) - 4d57851 linter/eslint: Enhance `no-empty-function` rule to support async and generator functions in VariableDeclarator (#21542) (Mikhail Baev) - 00fc136 codegen: Preserve coverage comments before object properties (#21312) (bab) - a56b7b9 oxlint: Dont enable gitlab formatter by default (#21501) (camc314) - 9c9b6a2 linter/array-callback-return: Ignore non-exit CFG dead ends (#21497) (camc314) - 61088e0 linter/unicorn: Handle computed property access in `prefer-dom-node-remove` rule (#21470) (Mikhail Baev) - eab5934 linter: Report an error on unsupported `extends` values (#21406) (John Costa) - 3289ba0 linter/valid-expect-in-promise: Check a jest fn to be `test` instead of `describe` (#21422) (Said Atrahouch) - 4417fe3 linter/prefer-ending-with-an-expect: Ignore vi.mock factory callbacks (#21414) (Cédric Exbrayat) - a904883 linter/consistent-type-imports: Ignore vue/svelte/astro files (#21415) (bab) - 2498fe6 linter/no-unused-vars: Allow segments of dotted namespace declarations (#21416) (bab) - 44b5b35 linter: Preserve vitest-compatible jest rules when applying overrides (#21389) (Cameron) - 7bd8331 linter/prefer-ending-with-an-expect: Add missing `version` docs (#21390) (Said Atrahouch) - 43d8f0d linter/no-useless-assignment: Ignore writes read by closures (#21380) (camc314) ### 📚 Documentation - c1eeae3 linter: Add version to `rule.json` (#21547) (camchenry) - 0ec6ab2 linter: Improve the `vitest/no-importing-vitest-globals` rule documentation. (#21557) (connorshea) # Oxfmt ### 💥 BREAKING CHANGES - 24fb7eb allocator: [**BREAKING**] Rename `Box` and `Vec` methods (#21395) (overlookmotel) ### 🚀 Features - 5aa7fe1 oxfmt: Add `--disable-nested-config` CLI flag (#21514) (leaysgur) - b5cb8d1 oxfmt: Update prettier to 3.8.3 (#21451) (leaysgur) - 16713d5 oxfmt/cli: Support per-directory config (#21103) (leaysgur) - 952de06 oxfmt/lsp: Support per-directory config (#21081) (leaysgur) ### 🐛 Bug Fixes - a501a53 formatter: Handle comments after pipe in single-member union types (#21487) (John Costa) - 6f49fad oxfmt: Respect nested config.`ignorePatterns` (#21489) (leaysgur) - 7c98d52 oxfmt: Do not panic on finding invalid nested config (#21461) (leaysgur) - 41bb2d5 formatter: Preserve more `intrinsic` parens (#21449) (leaysgur) - f894750 formatter: Preserve parens around `intrinsic` in type alias annotation (#21410) (Dunqing) ### ⚡ Performance - df27b48 oxfmt: Skip ancestors check when no nested config found (#21517) (leaysgur) - 5e1522a oxfmt: Do not occupy the rayon thread solely for handover (#21408) (leaysgur) Co-authored-by: camc314 <18101008+camc314@users.noreply.github.com>
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Summary
|and the first member in single-member union typesWhy
The formatter's single-member union "hug" optimization (
type A = | "VALUE"→type A = "VALUE") was incorrectly triggered when own-line comments appeared after the|pipe. The comment detection only checkedcomments_before(self.span().start)(before the|), missing comments between|and the member.Before:
After (matches Prettier):
Verification
Closes #21399