feat(linter/unicorn): implement prefer-class-fields #14245

camc314 · 2025-09-29T19:21:20Z

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camc314 · 2025-09-29T19:21:39Z

feat(linter/unicorn): implement prefer-class-fields #14245 👈 (View in Graphite)
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Pull Request Overview

This PR implements the prefer-class-fields rule for the eslint-plugin-unicorn linter. The rule encourages using class field declarations instead of this assignments in constructors for static values.

Adds a new linter rule that detects this.property = literal patterns in constructors
Provides automatic fixes to convert constructor assignments to class field declarations
Handles edge cases like existing property definitions and provides appropriate suggestions

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
`crates/oxc_linter/src/rules/unicorn/prefer_class_fields.rs`	Main implementation of the prefer-class-fields rule with detection logic and auto-fix capabilities
`crates/oxc_linter/src/rules.rs`	Registration of the new rule in the linter module system
`crates/oxc_linter/src/snapshots/unicorn_prefer_class_fields.snap`	Test snapshots showing expected diagnostic output for various test cases

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crates/oxc_linter/src/rules/unicorn/prefer_class_fields.rs

codspeed-hq · 2025-09-29T19:27:07Z

CodSpeed Instrumentation Performance Report

Merging #14245 will not alter performance

_{Comparing c/09-29-feat_linter_unicorn_implement_prefer-class-fields (7931be8) with main (55ebb8b)¹}

Summary

✅ 4 untouched
⏩ 33 skipped²

No successful run was found on main (7931be8) during the generation of this report, so 55ebb8b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩
33 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. ↩

graphite-app · 2025-09-29T19:38:51Z

Merge activity

Sep 29, 7:38 PM UTC: camc314 added this pull request to the Graphite merge queue.
Sep 29, 7:43 PM UTC: Merged by the Graphite merge queue.

## [1.20.0] - 2025-10-06 ### 🚀 Features - d16df93 linter: Support disable directives for type aware rules (#14052) (camc314) - f5c6acc linter: Add `vue/no-export-in-script-setup` rule (#14307) (Sysix) - 353b153 linter: Implement eslint/no-param-reassign rule (#14341) (Matthew Davis) - a2914fe linter/plugins: Add `loc` field getter to all AST nodes (#14355) (overlookmotel) - 07193c2 linter/plugins: Implement `SourceCode#getAncestors` (#14346) (overlookmotel) - c8de6fe linter/plugins: Add `parent` field to AST nodes (#14345) (overlookmotel) - 5505a86 linter/plugins: Include `range` field in AST (#14321) (overlookmotel) - 3656908 rust: Oxc-index-vec v4.0 (#14254) (Boshen) - 1347de4 linter/plugins: Accept diagnostics with `loc` (#14304) (overlookmotel) - aefc8b3 linter/plugins: Implement `SourceCode#getIndexFromLoc` and `getLocFromIndex` (#14303) (overlookmotel) - 93807db linter/plugins: Implement `SourceCode#lines` property (#14290) (overlookmotel) - 2f8c985 linter/plugins: Implement `SourceCode#visitorKeys` property (#14289) (overlookmotel) - b69028f linter/plugins: Implement `SourceCode#ast` property (#14287) (overlookmotel) - d8d3d18 linter: Add `vue/prefer-import-from-vue` rule (#14284) (Sysix) - f0e760b linter: Add `vue/define-props-destructuring` rule (#14272) (Sysix) - bdf9010 linter/plugins: Add `SourceCode` API (#14281) (overlookmotel) - 7f450fc linter/unicorn: Implement require-module-specifiers (#13089) (keita hino) - a1e7154 linter/unicorn: Implement prefer-classlist-toggle (#14262) (camc314) - 8217dce linter/unicorn: Implement no-unnecessary-array-splice-count (#14255) (camc314) - 3d5db4a linter/unicorn: Implement no-useless-error-capture-stack-trace (#14222) (camc314) - b3b482a linter/unicorn: Implement prefer-top-level-await (#14247) (camc314) - 7931be8 linter/unicorn: Implement prefer-class-fields (#14245) (camc314) - a39434a linter/unicorn: Implement prefer-at (#14232) (camc314) ### 🐛 Bug Fixes - e605222 linter/no-useless-undefined: Correctly respect `checkArguments` option (#14369) (camc314) - f1bc608 linter: Fix flaky import/no_cycle test (#14328) (Boshen) - 9a902c0 linter/plugins: Make `range` field non-optional on AST types (#14354) (overlookmotel) - 0a42d7f tsgolint: Report errors if we fail to parse tsgolint diagnostic messages (#14301) (camc314) - 42f8d7e linter/react-hooks: Fix diagnostic message for literal in dependency array (#14266) (camc314) - ece91c5 linter/react-hooks: Fix diagnostic message for duplicate dependency in array (#14265) (camc314) - 864fa0e linter/no-unused-expression: False positive with satisfies expressions (#14259) (camc314) - adff069 language_server: Don't apply "ignore this rule" fixes for fixAll code action + command (#14243) (Sysix) - 46cceb8 linter/rules-of-hooks: Correctly place primary span to fix disable directive (#14237) (camc314) ### 🚜 Refactor - 1489376 napi/parser, linter/plugins: Minify walker code (#14376) (overlookmotel) - c8eeeb5 linter/plugins: Remove build-time dependency on `napi/parser` (#14374) (overlookmotel) - fb1a067 linter/plugins: Bundle walker and AST types map (#14373) (overlookmotel) - 93d8164 linter/plugins: Export AST types direct from `oxlint` package (#14353) (overlookmotel) - 230d996 linter/plugins: `SourceCode#getText` use `range` (#14352) (overlookmotel) - 6e52bbd linter/plugins: Move location-related code into separate file (#14350) (overlookmotel) - 13f1003 linter/plugins: Share `ast` between files (#14349) (overlookmotel) - 00dde41 tsgolint: Make parsing `TsGoLintMessage` parsing errors an enum (#14300) (camc314) - fc314f5 tsgolint: Make `MessageType` parsing more idomatic (#14299) (camc314) - a24c36e language-server/tsgolint: Use an iterator for tsgolint message parsing (#14298) (camc314) - 8be432a tsgolint: Use an iterator for tsgolint message parsing (#14297) (camc314) - 57daa54 tsgolint: Remove always `Some` option wrapper (#14296) (camc314) - 79eadf8 linter: Introduce `LintRunner` (#14051) (camc314) - 65873ba linter/plugins: Add stubs for all `SourceCode` methods (#14285) (overlookmotel) - 989ce2f linter/plugins: Convert `Node` type to interface (#14280) (overlookmotel) - 891fc47 language_server: Share code for command `oxc.fixAll` and code action `source.fixAll.oxc` (#14244) (Sysix) - 7fe930c language_server: Remove unused fixture files (#14246) (Sysix) - 2b2c345 language-server: Move `generate_inverted_diagnostics` to `error_with_position` (#14118) (camc314) ### ⚡ Performance - fa3712d language_server: Create less `ExternalPluginStore`s (#14378) (overlookmotel) - e75d42d napi/parser, linter/plugins: Remove runtime `preserveParens` option from raw transfer deserializers (#14338) (overlookmotel) - 2e57351 linter/plugins: Initialize `lineStartOffsets` as `[0]` (#14302) (overlookmotel) - c27a393 linter/plugins: Deserialize AST on demand (#14288) (overlookmotel) - 95a8cc4 linter/plugins: Use singleton for `SourceCode` (#14286) (overlookmotel) ### 🧪 Testing - 0061ce7 linter: Add more tests for disable directives in partial loadable files (#14371) (camc314) - 1387aaa linter/plugins: Test `createOnce` returning no visitor functions (#14279) (overlookmotel) - 55ebb8b linter: Add test for `disable_for_this_section` fix (#14240) (Sysix) - a7e8662 linter: Port unicorn test cases to no-named-default (#14239) (camc314) Co-authored-by: camc314 <18101008+camc314@users.noreply.github.com>

github-actions bot added A-linter Area - Linter C-enhancement Category - New feature or request labels Sep 29, 2025

camc314 marked this pull request as ready for review September 29, 2025 19:21

Copilot AI review requested due to automatic review settings September 29, 2025 19:21

camc314 self-assigned this Sep 29, 2025

camc314 force-pushed the c/09-29-feat_linter_unicorn_implement_prefer-class-fields branch from 80794dd to f43ca76 Compare September 29, 2025 19:22

Copilot AI reviewed Sep 29, 2025

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camc314 force-pushed the c/09-29-feat_linter_unicorn_implement_prefer-class-fields branch from f43ca76 to f86b9e8 Compare September 29, 2025 19:35

feat(linter/unicorn): implement prefer-class-fields (#14245)

7931be8

graphite-app bot force-pushed the c/09-29-feat_linter_unicorn_implement_prefer-class-fields branch from f86b9e8 to 7931be8 Compare September 29, 2025 19:39

graphite-app bot merged commit 7931be8 into main Sep 29, 2025
19 checks passed

graphite-app bot deleted the c/09-29-feat_linter_unicorn_implement_prefer-class-fields branch September 29, 2025 19:43

Boshen mentioned this pull request Oct 6, 2025

release(oxlint): v1.20.0 #14381

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feat(linter/unicorn): implement prefer-class-fields #14245

feat(linter/unicorn): implement prefer-class-fields #14245

camc314 commented Sep 29, 2025

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codspeed-hq bot commented Sep 29, 2025 •

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Pull Request Overview

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CodSpeed Instrumentation Performance Report

Merging #14245 will not alter performance

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codspeed-hq bot commented Sep 29, 2025 •

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