# Oxlint
### 💥 BREAKING CHANGES

- f7da875 oxlint: [**BREAKING**] Remove oxc_language_server binary (#17457) (Boshen)

### 🚀 Features

- 659c23e linter: Init note field boilerplate  (#17589) (Shrey Sudhir)
- 6870b64 parser: Add TS1363 error code (#17609) (Sysix)
- 6154c8c linter/eslint-plugin-vitest: Implemented vitest/warn-todo rule (#17228) (Said Atrahouch)
- 0043cd6 linter/eslint-plugin-vitest: Implement consistent-vitest-vi rule (#17389) (Said Atrahouch)
- a6d773d linter: Add full TS support to eslint/no-useless-constructor (#17592) (camc314)
- f02c0e7 linter/eslint: Implement complexity (#17569) (Nguyen Tran)
- bc7aae7 linter/no-unused-vars: Add fixer to remove unused catch bindings (#17567) (Don Isaac)
- 9e8ec78 linter/only-throw-error rule: Add `allowRethrowing` option for  (#17554) (camc314)
- b67e819 linter: Add fixer for `unicorn/prefer-response-static-json` rule (#17559) (Mikhail Baev)
- 44b0361 linter/vue: Implement no-this-in-before-route-enter (#17525) (yefan)
- ee34716 linter/react: Implement no-will-update-set-state (#17530) (Kenzo Wada)
- 3088e1d linter/react: Implement no-this-in-sfc (#17535) (Kenzo Wada)
- 29a2868 linter/jsx-a11y: Implement no-static-element-interactions (#17538) (Kenzo Wada)
- eadf057 linter: Enable tsconfig auto discovery by default (#17489) (Boshen)
- 12a7d6e website_linter: Add a count of rules with fixes available to rules table. (#17476) (Connor Shea)

### 🐛 Bug Fixes

- a702f13 oxlint/lsp: Correct position for "disable for this file" with shebang (#17613) (Sysix)
- 19fdfb6 linter: Panic in `sort-keys` rule with Unicode numeric characters (#17629) (Adel Rodríguez)
- 2e8f469 vscode: Search for `node_modules/.bin/oxlint.exe` too (bun setup) (#17597) (Sysix)
- be39906 linter/aria-proptypes: Allow template literals with expressions for string-type ARIA props (#17460) (Jökull Sólberg Auðunsson)
- 529901c linter: Include JS plugin rules when calculating total rule count (#17520) (connorshea)
- 96ef2cc linter: Print total rule # when using a single nested config (#17517) (connorshea)
- 9ad0f29 oxlint: Do not enable external plugin store when no external linter is passed (#17498) (Sysix)
- 174375d oxfmt,oxlint: Disable mimalloc for 32-bit Arm targets (#17473) (Yaksh Bariya)
- ff70fe9 linter/no-standalone-expect: Allows expect in wrapper functions passed to test blocks (#17427) (Copilot)
- dab232f linter/catch-or-return: Handle arrow functions with implicit returns correctly (#17440) (Copilot)
- a38892a linter: Update no-unnecessary-template-expression docs and test case (#17453) (camc314)

### ⚡ Performance

- 605dbf1 vscode: Restrict searching for oxlint/oxfmt binaries only 3 levels deep + 10s timeout (#17345) (Sysix)

### 📚 Documentation

- 884fb63 linter/react: Improve docs for jsx-curly-brace-presence (#17579) (connorshea)
- 1d3ee07 linter: Improve rule explanation for `vue/no-this-in-before-route-enter`. (#17581) (connorshea)
- 5f189f8 linter/arrow-body-style: Correctly document default mode option (#17566) (Rägnar O'ock)
- bb2e8e4 linter: Add a note to the `typescript/no-var-requires` rule about the missing `allow` option (#17551) (connorshea)
- 655afc1 linter: Improve docs for `import/extensions` and add a few more tests (#17539) (connorshea)
- 7e5fc90 linter: Update list of plugins that are reserved. (#17516) (connorshea)
# Oxfmt
### 💥 BREAKING CHANGES

- f7da875 oxlint: [**BREAKING**] Remove oxc_language_server binary (#17457) (Boshen)

### 🚀 Features

- 8fd4ea9 oxfmt: `options.embeddedLanguageFormatting` is now `"auto"` by default (#17649) (leaysgur)

### 🐛 Bug Fixes

- c9b5d7d formatter/sort_imports: Handle alignable_comment correctly (#17646) (leaysgur)
- 453222d formatter: Missing comment handling for end-of-line comments in member chains (#17659) (Dunqing)
- 0805ff2 formatter: Incorrect inline comment placement in try-catch (#17657) (Dunqing)
- 3a0c782 formatter: Don't move comments into optional call parentheses (#17582) (magic-akari)
- 174375d oxfmt,oxlint: Disable mimalloc for 32-bit Arm targets (#17473) (Yaksh Bariya)

### ⚡ Performance

- abb28dc oxfmt: Turn of pretty print from sort-package-json (#17452) (Boshen)

Part of #16832.

This PR adds a dangerous suggestion for unused function parameters in
`no-unused-vars`, renaming them to the ignored `_name` form.

For example, with `args: "all"` and `argsIgnorePattern: "^_"`:

```js
function f(unused) {}
```

can be fixed with `--fix-dangerously` to:

```js
function f(_unused) {}
```

It intentionally only covers simple function parameters. Catch bindings
are already handled by #17567, and the remaining fixer categories from
#16832 are left for follow-up PRs.

This PR does not cover default parameters, destructuring parameters,
rest bindings, type parameters, or multi-declarator cleanup.

## Manual verification

I also verified the change against the actual `oxlint` CLI.

Input:

```js
function decl(unused, used) { console.log(used); }
const expr = function(unused) { return 1; };
const arrow = (unused) => 1;
const obj = { method(unused) { return 1; } };
function conflict(unused, _unused) { console.log(_unused); }
```

After running `oxlint --fix-dangerously` with `no-unused-vars`
configured as `{ "args": "all", "argsIgnorePattern": "^_" }`:

```js
function decl(_unused, used) { console.log(used); }
const expr = function(_unused) { return 1; };
const arrow = (_unused) => 1;
const obj = { method(_unused) { return 1; } };
function conflict(_unused0, _unused) { console.log(_unused); }
```

I also verified that `--fix-suggestions` does not apply this dangerous
suggestion, and that default/destructuring parameters are left
unchanged.

## Reviewer note

The existing diagnostic help for unused parameters still says:

```text
Consider removing this parameter.
```

This PR keeps that wording unchanged and only adds the dangerous rename
suggestion. I can adjust the help text in a follow-up if maintainers
prefer.

## AI usage

AI assistance was used for implementation support, code navigation, test
planning, manual verification, and self-review. I reviewed, tested, and
take responsibility for the submitted changes.

Original prompt / instructions given to AI were in Japanese. The English
version below is an LLM translation for reviewer convenience.

### Original Japanese prompt

> `no_unused_vars` の unused function parameter fixer だけを小さなスコープで実装する。
> `function f(unused) {}` のような未使用の関数パラメータに対して、削除ではなく `_unused` 形式へ
rename する dangerous suggestion を追加する。
> catch bindings、multi-declarator cleanup、type parameters、rest
bindings、destructuring parameters などは今回の PR では扱わない。
> 既存の fixer 実装とテスト構造に合わせ、rename conflict は既存の `_x`, `_x0`, `_x1` のような
handling に乗せる。
> function declaration、function expression、arrow function、method
parameter のテストを追加する。

### English translation by LLM

> Implement only the unused function parameter fixer for
`no_unused_vars` in a small scope.
> Add a dangerous suggestion for unused function parameters such as
`function f(unused) {}`, renaming them to the ignored `_unused` form
instead of deleting them.
> Do not cover catch bindings, multi-declarator cleanup, type
parameters, rest bindings, destructuring parameters, or other fixer
categories in this PR.
> Follow the existing fixer implementation and test structure, and reuse
the existing rename conflict handling such as `_x`, `_x0`, `_x1`.
> Add tests for function declarations, function expressions, arrow
functions, and method parameters.

---------

Co-authored-by: Cameron <[email protected]>