feat(linter/plugins): introduce `RuleTester` by overlookmotel · Pull Request #16206 · oxc-project/oxc

overlookmotel · 2025-11-27T11:22:00Z

Part of #16018.

Implement RuleTester class for testing rules. Has same API as ESLint's RuleTester.

A few features not implemented yet:

Fixes are not executed, or checked against provided output.
Suggestions are not checked (we don't yet have support for suggestions in JS plugins).
No use of config provided through RuleTester class constructor or via RuleTester.setDefaultConfig.

overlookmotel · 2025-11-27T11:22:16Z

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apps/oxlint/src-js/package/rule_tester.ts

overlookmotel · 2025-11-30T23:50:56Z

Merge activity

Nov 30, 11:50 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Nov 30, 11:51 PM UTC: overlookmotel added this pull request to the Graphite merge queue.
Nov 30, 11:58 PM UTC: Merged by the Graphite merge queue.

Part of #16018. Implement `RuleTester` class for testing rules. Has same API as ESLint's `RuleTester`. A few features not implemented yet: * Fixes are not executed, or checked against provided `output`. * Suggestions are not checked (we don't yet have support for suggestions in JS plugins). * No use of config provided through `RuleTester` class constructor or via `RuleTester.setDefaultConfig`.

…ion (#16302) Pure refactor. Move placeholder replacement into it's own function, so it can also be used by rule tester (#16206).

Store `messageId` in `DiagnosticReport` objects. It's not required for sending to Rust, but it is needed for rule tester (#16206). I think it's fine to add a little code that's redundant in the main runtime, because it only has an overhead when a rule produces diagnostics, which should be an uncommon path.

Add function to parse source text into raw transfer buffer to `apps/oxlint`. It's required for rule tester (#16206).

# Oxlint ### 🚀 Features - 5da1a63 linter/plugins: Introduce `RuleTester` (#16206) (overlookmotel) - 41129ab linter/plugins: Implement `languageOptions.parser` (#16292) (overlookmotel) - 4b24825 linter: Implement no-restricted-types rule (#16276) (camc314) - 7150209 linter/plugins: Implement `SourceCode#getNodeByRangeIndex` (#16256) (overlookmotel) - 3226864 linter/plugins: Implement options merging (#16217) (overlookmotel) - cbb108a linter/plugins: Support default options (#16170) (overlookmotel) - 04a3a66 linter/plugins: Implement `SourceCode#getTokenOrCommentAfter()` (#16045) (Arsh) - 68b63d9 linter/plugins: Implement `SourceCode#getTokenOrCommentBefore()` (#16044) (Arsh) - 04d9454 linter/plugins: Implement `SourceCode#getTokenByRangeStart()` (#16043) (Arsh) - 7b8d578 linter/plugins: Implement `SourceCode#getTokensBetween()` (#16034) (Arsh) - 79c242f linter/plugins: Implement `SourceCode#getLastTokensBetween()` (#16033) (Arsh) - 1772078 linter/plugins: Implement `SourceCode#getFirstTokenBetween()` (#16032) (Arsh) - 21bb86d linter/plugins: Implement `SourceCode#getFirstTokensBetween()` (#16019) (Arsh) - 78f74b1 linter/plugins: Implement `SourceCode#getLastTokenBetween()` (#16008) (Arsh) - df0b948 linter/plugins: Implement `SourceCode#getLastToken()` (#16003) (Arsh) ### 🐛 Bug Fixes - cf249f5 linter/plugins: Fix message interpolation (#16300) (overlookmotel) - 9149a26 linter/plugins, napi/parser: Deep freeze visitor keys (#16293) (overlookmotel) - 71271ee linter: Fix `typescript/no-empty-interface` config option casing. (#16282) (connorshea) - 653fa6c oxlint/oxfmt/lsp: Tell client the real tool name & version (#16212) (Sysix) - 385e13e linter: Support both prefer-inline and preferInline for import/no-duplicates (#16275) (copilot-swe-agent) - efc08d3 linter: Fix config docs for no-return-assign and unicode-bom rules. (#16260) (connorshea) - dc96d3f linter: Correct docs to use string option for import/first rule. (#16264) (connorshea) - 15ce491 linter: Correct the default config options for the switch-exhaustiveness-check rule. (#16268) (connorshea) - 13f985c linter: Fix casing for unicorn/explicit-length-check config option. (#16269) (connorshea) - 0df1901 linter/plugins: Reset state after error during AST visitation (#16246) (overlookmotel) - 42e9dcc linter: Fix docs for `consistent-type-specifier-style` and `consistent-type-definitions` rules. (#16253) (connorshea) - 505ceb1 linter: Fix the radix rule docs to correctly render as a string-only config option (#16248) (connorshea) - 135cee6 oxlint/lsp: Run diagnostics after delayed worker initialization (#16244) (Sysix) - 78aa294 linter/plugins: Deep freeze options (#16218) (overlookmotel) - 123bffe linter/plugins: Handle zero-token files in `SourceCode#getLastToken()` (#16184) (Arsh) - 55fcfba linter: Add considerDefaultExhaustiveForUnions option to switch-exhaustiveness-check (#16204) (camc314) - 9cc20a1 minifier: Avoid merging side effectful expressions to next assignment statement if the side effect may change the left hand side reference (#16165) (sapphi-red) - 75249e0 linter/plugins: Handle non-UTF8 file paths (#16157) (overlookmotel) - 86fa667 linter/plugins: Improve type def for `RuleMeta` `defaultOptions` property (#16159) (overlookmotel) - d2b7dcb tsgolint: Improve lsp diagnostic when linting fails (#16115) (camc314) - 8810bd5 linter: Prevent conflicting fixes between prefer_number_properties and prefer_numeric_literals (#16113) (camc314) - 91eb3f2 ast/estree: Convert `TSImportType` `argument` field to `Literal` (#16109) (overlookmotel) - 2da2fc1 linter: Fix prefer-string-raw fixer producing invalid JS for non-ASCII strings (#16102) (camc314) - f5cb601 linter/plugins: Perform length checks before continuing loops (#16025) (Arsh) - e1c21ca linter/jsx-key: Implement missing options (#15731) (camc314) ### ⚡ Performance - 02bdf90 linter/plugins, napi/parser: Reuse arrays in visitor keys (#16294) (overlookmotel) - 714a91a linter/no-restricted-types: Skip running if config is empty (#16278) (camc314) - d3a34f8 linter/plugins: Optimize `getTokens()` and other methods (#16188) (Arsh) - c05db06 linter/plugins: Speed up `initTokensWithComments` (#16117) (overlookmotel) - 4846886 linter/plugins: Optimize merging of `tokens` and `comments` (#16071) (Arsh) - e232d35 linter/plugins: Recycle objects in token methods (#16068) (overlookmotel) ### 📚 Documentation - e928732 linter/plugins: Fix JSDoc comment (#16295) (overlookmotel) - d4a1581 linter: Add a link to MDN for the no-proto rule. (#16213) (connorshea) - be36e36 linter/plugins: Fix JSDoc comment for `loadPluginImpl` (#16211) (overlookmotel) - 6d6e9c9 linter: Improve the docs for oxc/no-async-await rule. (#16181) (connorshea) - 0e1d38a linter/plugins: Clarify JSDoc comment for `getTokensBetween` (#16070) (overlookmotel) - 3ee22b2 linter/plugins: Fix JSDoc comments for tokens methods (#16063) (overlookmotel) - f257b5c linter/plugins: Clarify JSDoc comments for tokens methods (#16062) (overlookmotel) # Oxfmt ### 🚀 Features - 116e0d1 website: Auto generate oxfmt docs (#15985) (Boshen) - 862bdf7 oxfmt: Detect unsupported experimental options (take2) (#16088) (leaysgur) ### 🐛 Bug Fixes - 75ac90c formatter: Comments in call arguments should be printed as-is (#16327) (Dunqing) - fd77568 formatter: Don't wrap parenthesis for yield expression if there is no leading comment (#16326) (Dunqing) - 8ccfb06 formatter: Should indent class extends and interface heritage when it is a member expression without type arguments (#16323) (Dunqing) - 0faa978 oxfmt: JsFormatEmbeddedCb types (#16324) (Brooooooklyn) - 2b8f982 formatter: JSX text wrapping incorrect (#16318) (Dunqing) - f3ffebe formatter: Should indent variable declarator if there is a trailing comment (#16243) (Dunqing) - 31d3186 formatter: Incorrect handling of directives with comments (#16235) (Dunqing) - ac8fcaf formatter: Add parens for new: private field expr (#16312) (leaysgur) - 653fa6c oxlint/oxfmt/lsp: Tell client the real tool name & version (#16212) (Sysix) - 380a0af formatter: Incorrect printing of class binding trailing comments (#16234) (Dunqing) - 0ca8154 formatter: Incorrect printing of trailing comments of callee when the call arguments are empty (#16232) (Dunqing) - ac3a92e formatter: Print comment in ternary jsx (#16224) (leaysgur) - e3a7388 formatter: Fix parens for static member chain (#16229) (leaysgur) - 55334c3 formatter: Incorrect printing of dangling comments in the if statement (#16228) (Dunqing) - 9096a63 formatter: Correct printing of trailing comments after the semicolon for class properties (#16225) (Dunqing) - 75fd568 formatter: Inconsistent union type output between two runs (#16222) (Dunqing) - cd70484 formatter: Should not add a hard space before function body (#16221) (Dunqing) - 9097167 formatter: Incorrect printing of union types with comments (#16205) (Dunqing) - 79b78b3 formatter: Template literal element should not be indented (#16189) (Dunqing) - 48d6ed2 formatter: Nested assignment pattern should not expand outer object pattern (#16160) (Dunqing) - 8f4137d formatter: Output is incorrect when using comments inside JSX which is the right hand-side of `LogicalExpression` (#16156) (Dunqing) - 85c3a10 formatter/sort_imports: Handle internal prefixes correctly (#16128) (leaysgur) - 38b7bc4 oxfmt: Make no-napi build work (#16134) (leaysgur) - 889d2e7 formatter: Handle poor layout for grouped call arguments (#16093) (Dunqing) - 14b0a6a oxfmt: Fix JS-ish file detection (#16092) (leaysgur) - 9706a1a oxfmt: Ignore unsupported options (#16085) (leaysgur)

…16210) Pure refactor. Move a few lines of code into `loadPlugin`, to leave a sync function `registerPlugin` which contains the logic for registering a plugin. Required for oxc-project#16206, which will call this method directly, skipping `import`-ing the plugin from a module.

Implement function for merging rule options from config with the rule's default options. This function is not currently used, as we don't have a way to get options from config over from Rust to JS yet, but I've implemented it now, as it's also needed for the rule tester (oxc-project#16206).

…ion (oxc-project#16302) Pure refactor. Move placeholder replacement into it's own function, so it can also be used by rule tester (oxc-project#16206).

…ct#16296) Store `messageId` in `DiagnosticReport` objects. It's not required for sending to Rust, but it is needed for rule tester (oxc-project#16206). I think it's fine to add a little code that's redundant in the main runtime, because it only has an overhead when a rule produces diagnostics, which should be an uncommon path.

Add function to parse source text into raw transfer buffer to `apps/oxlint`. It's required for rule tester (oxc-project#16206).

Part of oxc-project#16018. Implement `RuleTester` class for testing rules. Has same API as ESLint's `RuleTester`. A few features not implemented yet: * Fixes are not executed, or checked against provided `output`. * Suggestions are not checked (we don't yet have support for suggestions in JS plugins). * No use of config provided through `RuleTester` class constructor or via `RuleTester.setDefaultConfig`.

# Oxlint ### 🚀 Features - 5da1a63 linter/plugins: Introduce `RuleTester` (oxc-project#16206) (overlookmotel) - 41129ab linter/plugins: Implement `languageOptions.parser` (oxc-project#16292) (overlookmotel) - 4b24825 linter: Implement no-restricted-types rule (oxc-project#16276) (camc314) - 7150209 linter/plugins: Implement `SourceCode#getNodeByRangeIndex` (oxc-project#16256) (overlookmotel) - 3226864 linter/plugins: Implement options merging (oxc-project#16217) (overlookmotel) - cbb108a linter/plugins: Support default options (oxc-project#16170) (overlookmotel) - 04a3a66 linter/plugins: Implement `SourceCode#getTokenOrCommentAfter()` (oxc-project#16045) (Arsh) - 68b63d9 linter/plugins: Implement `SourceCode#getTokenOrCommentBefore()` (oxc-project#16044) (Arsh) - 04d9454 linter/plugins: Implement `SourceCode#getTokenByRangeStart()` (oxc-project#16043) (Arsh) - 7b8d578 linter/plugins: Implement `SourceCode#getTokensBetween()` (oxc-project#16034) (Arsh) - 79c242f linter/plugins: Implement `SourceCode#getLastTokensBetween()` (oxc-project#16033) (Arsh) - 1772078 linter/plugins: Implement `SourceCode#getFirstTokenBetween()` (oxc-project#16032) (Arsh) - 21bb86d linter/plugins: Implement `SourceCode#getFirstTokensBetween()` (oxc-project#16019) (Arsh) - 78f74b1 linter/plugins: Implement `SourceCode#getLastTokenBetween()` (oxc-project#16008) (Arsh) - df0b948 linter/plugins: Implement `SourceCode#getLastToken()` (oxc-project#16003) (Arsh) ### 🐛 Bug Fixes - cf249f5 linter/plugins: Fix message interpolation (oxc-project#16300) (overlookmotel) - 9149a26 linter/plugins, napi/parser: Deep freeze visitor keys (oxc-project#16293) (overlookmotel) - 71271ee linter: Fix `typescript/no-empty-interface` config option casing. (oxc-project#16282) (connorshea) - 653fa6c oxlint/oxfmt/lsp: Tell client the real tool name & version (oxc-project#16212) (Sysix) - 385e13e linter: Support both prefer-inline and preferInline for import/no-duplicates (oxc-project#16275) (copilot-swe-agent) - efc08d3 linter: Fix config docs for no-return-assign and unicode-bom rules. (oxc-project#16260) (connorshea) - dc96d3f linter: Correct docs to use string option for import/first rule. (oxc-project#16264) (connorshea) - 15ce491 linter: Correct the default config options for the switch-exhaustiveness-check rule. (oxc-project#16268) (connorshea) - 13f985c linter: Fix casing for unicorn/explicit-length-check config option. (oxc-project#16269) (connorshea) - 0df1901 linter/plugins: Reset state after error during AST visitation (oxc-project#16246) (overlookmotel) - 42e9dcc linter: Fix docs for `consistent-type-specifier-style` and `consistent-type-definitions` rules. (oxc-project#16253) (connorshea) - 505ceb1 linter: Fix the radix rule docs to correctly render as a string-only config option (oxc-project#16248) (connorshea) - 135cee6 oxlint/lsp: Run diagnostics after delayed worker initialization (oxc-project#16244) (Sysix) - 78aa294 linter/plugins: Deep freeze options (oxc-project#16218) (overlookmotel) - 123bffe linter/plugins: Handle zero-token files in `SourceCode#getLastToken()` (oxc-project#16184) (Arsh) - 55fcfba linter: Add considerDefaultExhaustiveForUnions option to switch-exhaustiveness-check (oxc-project#16204) (camc314) - 9cc20a1 minifier: Avoid merging side effectful expressions to next assignment statement if the side effect may change the left hand side reference (oxc-project#16165) (sapphi-red) - 75249e0 linter/plugins: Handle non-UTF8 file paths (oxc-project#16157) (overlookmotel) - 86fa667 linter/plugins: Improve type def for `RuleMeta` `defaultOptions` property (oxc-project#16159) (overlookmotel) - d2b7dcb tsgolint: Improve lsp diagnostic when linting fails (oxc-project#16115) (camc314) - 8810bd5 linter: Prevent conflicting fixes between prefer_number_properties and prefer_numeric_literals (oxc-project#16113) (camc314) - 91eb3f2 ast/estree: Convert `TSImportType` `argument` field to `Literal` (oxc-project#16109) (overlookmotel) - 2da2fc1 linter: Fix prefer-string-raw fixer producing invalid JS for non-ASCII strings (oxc-project#16102) (camc314) - f5cb601 linter/plugins: Perform length checks before continuing loops (oxc-project#16025) (Arsh) - e1c21ca linter/jsx-key: Implement missing options (oxc-project#15731) (camc314) ### ⚡ Performance - 02bdf90 linter/plugins, napi/parser: Reuse arrays in visitor keys (oxc-project#16294) (overlookmotel) - 714a91a linter/no-restricted-types: Skip running if config is empty (oxc-project#16278) (camc314) - d3a34f8 linter/plugins: Optimize `getTokens()` and other methods (oxc-project#16188) (Arsh) - c05db06 linter/plugins: Speed up `initTokensWithComments` (oxc-project#16117) (overlookmotel) - 4846886 linter/plugins: Optimize merging of `tokens` and `comments` (oxc-project#16071) (Arsh) - e232d35 linter/plugins: Recycle objects in token methods (oxc-project#16068) (overlookmotel) ### 📚 Documentation - e928732 linter/plugins: Fix JSDoc comment (oxc-project#16295) (overlookmotel) - d4a1581 linter: Add a link to MDN for the no-proto rule. (oxc-project#16213) (connorshea) - be36e36 linter/plugins: Fix JSDoc comment for `loadPluginImpl` (oxc-project#16211) (overlookmotel) - 6d6e9c9 linter: Improve the docs for oxc/no-async-await rule. (oxc-project#16181) (connorshea) - 0e1d38a linter/plugins: Clarify JSDoc comment for `getTokensBetween` (oxc-project#16070) (overlookmotel) - 3ee22b2 linter/plugins: Fix JSDoc comments for tokens methods (oxc-project#16063) (overlookmotel) - f257b5c linter/plugins: Clarify JSDoc comments for tokens methods (oxc-project#16062) (overlookmotel) # Oxfmt ### 🚀 Features - 116e0d1 website: Auto generate oxfmt docs (oxc-project#15985) (Boshen) - 862bdf7 oxfmt: Detect unsupported experimental options (take2) (oxc-project#16088) (leaysgur) ### 🐛 Bug Fixes - 75ac90c formatter: Comments in call arguments should be printed as-is (oxc-project#16327) (Dunqing) - fd77568 formatter: Don't wrap parenthesis for yield expression if there is no leading comment (oxc-project#16326) (Dunqing) - 8ccfb06 formatter: Should indent class extends and interface heritage when it is a member expression without type arguments (oxc-project#16323) (Dunqing) - 0faa978 oxfmt: JsFormatEmbeddedCb types (oxc-project#16324) (Brooooooklyn) - 2b8f982 formatter: JSX text wrapping incorrect (oxc-project#16318) (Dunqing) - f3ffebe formatter: Should indent variable declarator if there is a trailing comment (oxc-project#16243) (Dunqing) - 31d3186 formatter: Incorrect handling of directives with comments (oxc-project#16235) (Dunqing) - ac8fcaf formatter: Add parens for new: private field expr (oxc-project#16312) (leaysgur) - 653fa6c oxlint/oxfmt/lsp: Tell client the real tool name & version (oxc-project#16212) (Sysix) - 380a0af formatter: Incorrect printing of class binding trailing comments (oxc-project#16234) (Dunqing) - 0ca8154 formatter: Incorrect printing of trailing comments of callee when the call arguments are empty (oxc-project#16232) (Dunqing) - ac3a92e formatter: Print comment in ternary jsx (oxc-project#16224) (leaysgur) - e3a7388 formatter: Fix parens for static member chain (oxc-project#16229) (leaysgur) - 55334c3 formatter: Incorrect printing of dangling comments in the if statement (oxc-project#16228) (Dunqing) - 9096a63 formatter: Correct printing of trailing comments after the semicolon for class properties (oxc-project#16225) (Dunqing) - 75fd568 formatter: Inconsistent union type output between two runs (oxc-project#16222) (Dunqing) - cd70484 formatter: Should not add a hard space before function body (oxc-project#16221) (Dunqing) - 9097167 formatter: Incorrect printing of union types with comments (oxc-project#16205) (Dunqing) - 79b78b3 formatter: Template literal element should not be indented (oxc-project#16189) (Dunqing) - 48d6ed2 formatter: Nested assignment pattern should not expand outer object pattern (oxc-project#16160) (Dunqing) - 8f4137d formatter: Output is incorrect when using comments inside JSX which is the right hand-side of `LogicalExpression` (oxc-project#16156) (Dunqing) - 85c3a10 formatter/sort_imports: Handle internal prefixes correctly (oxc-project#16128) (leaysgur) - 38b7bc4 oxfmt: Make no-napi build work (oxc-project#16134) (leaysgur) - 889d2e7 formatter: Handle poor layout for grouped call arguments (oxc-project#16093) (Dunqing) - 14b0a6a oxfmt: Fix JS-ish file detection (oxc-project#16092) (leaysgur) - 9706a1a oxfmt: Ignore unsupported options (oxc-project#16085) (leaysgur)

github-actions bot added A-linter Area - Linter A-cli Area - CLI A-linter-plugins Area - Linter JS plugins labels Nov 27, 2025

github-actions bot added the C-enhancement Category - New feature or request label Nov 27, 2025

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refactor(linter/plugins): add registerPlugin function #16210

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docs(linter/plugins): fix JSDoc comment for loadPluginImpl #16211

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refactor(linter/plugins): split JSON deep freeze into multiple functions #16216

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refactor(linter/plugins): move placeholder replacement into own function #16302

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refactor(linter/plugins): move placeholder replacement into own funct…

9de386d

…ion (#16302) Pure refactor. Move placeholder replacement into it's own function, so it can also be used by rule tester (#16206).

graphite-app bot pushed a commit that referenced this pull request Nov 30, 2025

refactor(linter/plugins): add parse function (#16240)

db2afba

Add function to parse source text into raw transfer buffer to `apps/oxlint`. It's required for rule tester (#16206).

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Boshen mentioned this pull request Dec 1, 2025

release(apps): oxlint v1.31.0 && oxfmt v0.16.0 #16333

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Linter plugins: Rule tester #16018

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refactor(linter/plugins): add parse function (oxc-project#16240)

3464c14

Add function to parse source text into raw transfer buffer to `apps/oxlint`. It's required for rule tester (oxc-project#16206).

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feat(linter/plugins): introduce `RuleTester`#16206

feat(linter/plugins): introduce `RuleTester`#16206
graphite-app[bot] merged 1 commit intomainfrom
11-26-feat_linter_plugins_introduce_ruletester_

overlookmotel commented Nov 27, 2025 •

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overlookmotel commented Nov 30, 2025 •

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overlookmotel commented Nov 27, 2025 •

edited

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overlookmotel commented Nov 27, 2025 •

edited

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overlookmotel commented Nov 30, 2025 •

edited by graphite-app bot

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