fix(linter/no-useless-assignment): improve diagnostic spans#21581
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Pull request overview
This PR refines no-useless-assignment diagnostics so dead declaration initializers are reported on the symbol’s binding span (e.g., the identifier in the pattern) rather than the entire declarator node, and expands snapshot coverage for destructuring cases.
Changes:
- Track a
compact_idx -> SymbolIdmapping to recover the symbol associated with each liveness index. - Emit diagnostics at
symbol_spanfor declaration writes (falling back to the op node span for non-declaration writes). - Add snapshot test coverage for array destructuring to validate binding-focused spans.
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Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| crates/oxc_linter/src/rules/eslint/no_useless_assignment.rs | Adds compact-index → symbol tracking and uses symbol_span for declaration diagnostics; extends tests for array destructuring. |
| crates/oxc_linter/src/snapshots/eslint_no_useless_assignment.snap | Updates snapshots to reflect narrowed diagnostic spans and new destructuring coverage. |
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graphite-app Bot
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## Summary - track each compact liveness index back to its SymbolId - report dead declaration initializers on the symbol binding span instead of the full declarator node - add object and array destructuring snapshot coverage for binding-focused diagnostics ## Test plan - just fmt - cargo test -p oxc_linter no_useless_assignment::test AI assistance used: OpenAI Codex.
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## Summary - track each compact liveness index back to its SymbolId - report dead declaration initializers on the symbol binding span instead of the full declarator node - add object and array destructuring snapshot coverage for binding-focused diagnostics ## Test plan - just fmt - cargo test -p oxc_linter no_useless_assignment::test AI assistance used: OpenAI Codex.
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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
Test plan
AI assistance used: OpenAI Codex.