{"id":"223188fd-79f6-467e-9460-909ac2079667","shortId":"h5HsEd","kind":"skill","title":"biome","tagline":"Lint and format frontend code with Biome 2.4. Covers type-aware linting, GritQL custom rules, domains, import organizer, and migration from ESLint/Prettier. Use when configuring linting rules, formatting code, writing custom lint rules, or setting up CI checks. Triggers on biome,","description":"# Biome\n\nFast, unified linting, formatting, and import organization for JavaScript, TypeScript, JSX, CSS, and GraphQL. Biome 2.4 provides type-aware linting without the TypeScript compiler, GritQL plugins for custom rules, and domain-based rule grouping. Single binary, zero config by default, 97% Prettier compatibility.\n\n## Critical Rules\n\n### `files.ignore` DOES NOT EXIST - use `files.includes` with negation\n\nBiome 2.x only supports `files.includes` (with an `s`). There is NO `files.ignore`, NO `files.include` (without `s`), NO `files.exclude`. Using any of these will throw `Found an unknown key` errors.\n\nThe only valid keys under `files` are: `includes`, `maxSize`, `ignoreUnknown`. (`experimentalScannerIgnores` exists but is now marked **deprecated** in upstream docs and may be removed.)\n\nTo exclude files (generated code, vendored files, etc.), use negation patterns in `files.includes`:\n\n```json\n{\n  \"files\": {\n    \"includes\": [\"**\", \"!**/routeTree.gen.ts\", \"!**/generated/**\"]\n  }\n}\n```\n\nFor paths the scanner must skip even when other tools or assists would otherwise touch them, use the `!!` force-ignore syntax inside `files.includes` (replaces `experimentalScannerIgnores`):\n\n```json\n{\n  \"files\": {\n    \"includes\": [\"**\", \"!!**/legacy-vendor/**\"]\n  }\n}\n```\n\nDo NOT use `overrides` with `linter/formatter/assists: { enabled: false }` to skip generated files - that approach is fragile (easy to miss a subsystem like assists/import organizer) and unnecessarily complex. Just exclude via `files.includes`.\n\n### Always use `biome check`, not separate lint + format\n\n`biome check` runs formatter, linter, and import organizer in one pass. Never call `biome lint` and `biome format` separately in CI - use `biome check` (or `biome ci` for CI mode).\n\n### biome.json lives at project root\n\nEvery project needs one `biome.json` at the root. Monorepo packages use nested configs with `\"extends\": \"//\"` to inherit from root. Never use relative paths like `\"extends\": [\"../../biome.json\"]`.\n\n### Use `--write` to apply fixes\n\n```bash\nbiome check --write .            # Apply safe fixes only\nbiome check --write --unsafe .   # Apply all fixes including unsafe (review changes)\n```\n\n`--fix` exists as an alias for `--write` on `biome lint` and `biome format`, but `biome check` is the canonical entry point and `--write` is the documented flag. Stick with `--write`.\n\n**Safe vs unsafe fixes.** Removing unused imports, parameters, and variables is classified as **unsafe** (an external caller could still reference the symbol). Plain `--write` will leave them in place and report the diagnostic. Use `--write --unsafe` (and review the diff) or delete them by hand.\n\n### Pin exact versions and migrate after upgrades\n\n```bash\npnpm add --save-dev --save-exact @biomejs/biome@latest\npnpm biome migrate --write\n```\n\nThe `$schema` URL in `biome.json` is version-pinned (e.g. `\"$schema\": \"https://biomejs.dev/schemas/2.4.13/schema.json\"`). After bumping `@biomejs/biome`, the CLI errors with `The configuration schema version does not match the CLI version` until you run `biome migrate --write`. Run it as part of the upgrade, not later.\n\n## Quick Start\n\n```bash\npnpm add --save-dev --save-exact @biomejs/biome\npnpm biome init    # Creates default biome.json with recommended rules\n```\n\n### IDE Setup\n\n**VS Code** - Install `biomejs.biome` extension:\n\n```json\n{\n  \"editor.defaultFormatter\": \"biomejs.biome\",\n  \"editor.formatOnSave\": true,\n  \"editor.codeActionsOnSave\": {\n    \"source.fixAll.biome\": \"explicit\",\n    \"source.organizeImports.biome\": \"explicit\"\n  }\n}\n```\n\n`source.fixAll.biome` applies safe lint fixes on save; `source.organizeImports.biome` runs the assist. Both are needed for parity with the CLI's `biome check --write`.\n\n**Zed** - Biome extension available natively. The inline-config feature (v2.4) lets editors override rules without affecting `biome.json`. Note the spelling: **Zed uses `inline_config` (snake_case); the VS Code extension uses `inlineConfig` (camelCase)**.\n\n```json\n{\n  \"formatter\": { \"language_server\": { \"name\": \"biome\" } },\n  \"lsp\": {\n    \"biome\": {\n      \"settings\": {\n        \"inline_config\": {\n          \"linter\": { \"rules\": { \"suspicious\": { \"noConsole\": \"off\" } } }\n        }\n      }\n    }\n  }\n}\n```\n\n### CI Integration\n\n```bash\npnpm biome ci .                                  # No writes, non-zero exit on errors\npnpm biome ci --reporter=default --reporter=github .  # GitHub Actions annotations\n```\n\n## Configuration (biome.json)\n\n### Recommended config for React/TypeScript projects\n\n```json\n{\n  \"$schema\": \"./node_modules/@biomejs/biome/configuration_schema.json\",\n  \"vcs\": {\n    \"enabled\": true,\n    \"clientKind\": \"git\",\n    \"useIgnoreFile\": true\n  },\n  \"files\": {\n    \"includes\": [\n      \"src/**/*.ts\", \"src/**/*.tsx\",\n      \"tests/**/*.ts\", \"**/*.config.ts\", \"**/*.json\",\n      \"!**/generated\", \"!**/components/ui\"\n    ]\n  },\n  \"formatter\": {\n    \"enabled\": true,\n    \"indentStyle\": \"space\",\n    \"indentWidth\": 2,\n    \"lineWidth\": 120\n  },\n  \"linter\": {\n    \"enabled\": true,\n    \"rules\": { \"recommended\": true },\n    \"domains\": { \"react\": \"recommended\" }\n  },\n  \"javascript\": {\n    \"formatter\": { \"quoteStyle\": \"double\" }\n  },\n  \"assist\": {\n    \"enabled\": true,\n    \"actions\": {\n      \"source\": { \"organizeImports\": \"on\" }\n    }\n  }\n}\n```\n\n### Formatter options\n\nKey options: `indentStyle` (`\"space\"`/`\"tab\"`), `indentWidth`, `lineWidth`, `lineEnding` (`\"lf\"`/`\"crlf\"`), `trailingNewline`. JS-specific: `quoteStyle`, `trailingCommas`, `semicolons`, `arrowParentheses`, `bracketSpacing`.\n\n### Linter rule configuration\n\nRules use severity levels `\"error\"`, `\"warn\"`, `\"info\"`, or `\"off\"`. Some accept options:\n\n```json\n{\n  \"linter\": {\n    \"rules\": {\n      \"recommended\": true,\n      \"style\": {\n        \"noRestrictedGlobals\": {\n          \"level\": \"error\",\n          \"options\": {\n            \"deniedGlobals\": {\n              \"Buffer\": \"Use Uint8Array for browser compatibility.\"\n            }\n          }\n        },\n        \"useComponentExportOnlyModules\": \"off\"\n      }\n    }\n  }\n}\n```\n\n### Import organizer\n\nThe import organizer (Biome Assist) merges duplicates, sorts by distance, and supports custom grouping. As of v2.4.13 it also sorts imports inside TypeScript modules (`module \"x\" { ... }`) and `.d.ts` declaration files.\n\n```json\n{\n  \"assist\": {\n    \"enabled\": true,\n    \"actions\": {\n      \"source\": {\n        \"organizeImports\": {\n          \"level\": \"on\",\n          \"options\": {\n            \"groups\": [\n              { \"source\": \"builtin\" },\n              { \"source\": \"external\" },\n              { \"source\": \"internal\", \"match\": \"@company/*\" },\n              { \"source\": \"relative\" }\n            ]\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n### Per-subsystem includes\n\nEach subsystem (`linter`, `formatter`, `assist`) has its own `includes` for fine-grained scoping. Applied after `files.includes` - can only narrow, not widen.\n\n```json\n{\n  \"files\": {\n    \"includes\": [\"**\", \"!**/dist\"]\n  },\n  \"linter\": {\n    \"includes\": [\"**\", \"!**/components/ui\"]\n  },\n  \"formatter\": {\n    \"includes\": [\"**\", \"!**/components/ui\"]\n  }\n}\n```\n\nThis lints and formats everything except `dist/` and `components/ui`, while assists (import organizer) still run on `components/ui`.\n\n### Overrides\n\nOverrides apply different settings to specific file patterns. Use for per-file rule tweaks (e.g., relaxing rules for vendored/shadcn components). The field is `includes` (with `s`).\n\n```json\n{\n  \"overrides\": [\n    {\n      \"includes\": [\"**/components/ui/**\"],\n      \"linter\": {\n        \"rules\": {\n          \"suspicious\": { \"noDocumentCookie\": \"off\" },\n          \"style\": { \"useComponentExportOnlyModules\": \"off\" }\n        }\n      }\n    },\n    {\n      \"includes\": [\"**/*.test.ts\"],\n      \"linter\": {\n        \"rules\": {\n          \"suspicious\": { \"noConsole\": \"off\" }\n        }\n      }\n    }\n  ]\n}\n```\n\n### Monorepo configuration\n\nRoot `biome.json` holds shared config. Package configs inherit with `\"extends\": \"//\"`:\n\n```json\n{\n  \"$schema\": \"../../node_modules/@biomejs/biome/configuration_schema.json\",\n  \"extends\": \"//\"\n}\n```\n\nOverride specific rules per package by adding a `linter.rules` section alongside `\"extends\": \"//\"`.\n\n### Configuration file discovery (v2.4)\n\nSearch order: `biome.json` -> `biome.jsonc` -> `.biome.json` -> `.biome.jsonc` -> platform config home.\n\nPlatform config home paths:\n\n| Platform | Path |\n|----------|------|\n| Linux | `$XDG_CONFIG_HOME/biome` (or `~/.config/biome`) |\n| macOS | `~/Library/Application Support/biome` |\n| Windows | `%APPDATA%\\biome\\config` (i.e. `C:\\Users\\<user>\\AppData\\Roaming\\biome\\config`) |\n\n## Other v2.4 highlights\n\n- **Embedded snippets**: Biome 2.4 formats and lints CSS and GraphQL embedded inside JavaScript (e.g. `styled-components`, Emotion, `gql` template literals). Works automatically; no extra config.\n- **Vue/Svelte parser improvements**: substantially fewer false positives in `noUnusedVariables`, `useConst`, `useImportType`, and `noUnusedImports` inside `.vue` and `.svelte` files.\n\n## Domains\n\nDomains group lint rules by technology. Enable only what your stack needs:\n\n```json\n{\n  \"linter\": {\n    \"domains\": {\n      \"react\": \"recommended\",\n      \"next\": \"recommended\",\n      \"test\": \"recommended\",\n      \"types\": \"all\"\n    }\n  }\n}\n```\n\n| Domain | Purpose | Auto-detected |\n|--------|---------|---------------|\n| `react` | React hooks, JSX patterns | `react >= 16.0.0` |\n| `reactNative` | React Native rules (`noReactNativeRawText`, `noReactNativeLiteralColors`, `noReactNativeDeepImports`, `useReactNativePlatformComponents`) | `react-native` |\n| `next` | Next.js-specific rules | `next >= 14.0.0` |\n| `solid` | Solid.js rules | `solid-js` dependency |\n| `qwik` | Qwik-specific rules | `@builder.io/qwik` |\n| `vue` | Vue-specific rules | `vue` |\n| `test` | Testing best practices (any framework) | `jest`, `mocha`, `ava`, or `vitest` |\n| `playwright` | Playwright test rules | `@playwright/test` |\n| `drizzle` | Drizzle ORM safety rules | `drizzle-orm` |\n| `turborepo` | Turborepo monorepo rules | `turbo` |\n| `project` | Cross-file analysis (noImportCycles, noUnresolvedImports) | - |\n| `types` | Type inference rules (noFloatingPromises, noMisusedPromises) | - |\n\n**Activation levels:** `\"recommended\"` (stable rules only), `\"all\"` (includes nursery), `\"none\"` (disable).\n\nThe `project` domain enables rules needing the module graph. The `types` domain (v2.4) enables rules requiring type inference. Both trigger a file scan that adds a small overhead.\n\n## Type-Aware Linting\n\nBiome 2.0 introduced type-aware linting without the TypeScript compiler. Biome has its own type inference engine in Rust - no `typescript` dependency needed.\n\n### How it works\n\nEnable the `types` domain to activate file scanning and type inference. Performance impact is minimal compared to typescript-eslint because inference runs natively.\n\n**v2.4.12 improvements:** type-aware rules now resolve members through the `Pick<T, K>`, `Omit<T, K>`, `Partial<T>`, `Required<T>`, and `Readonly<T>` utility types (preserving `optional`, `readonly`, and nullable flags), so rules see the same shape your code does.\n\n### Key rules\n\n| Rule | What it catches |\n|------|----------------|\n| `noFloatingPromises` | Unhandled promises (missing await/return/void) |\n| `noMisusedPromises` | Promises in conditionals, array callbacks |\n| `useAwaitThenable` | Awaiting non-thenable values |\n| `noUnnecessaryConditions` | Conditions that are always true/false |\n| `useRegexpExec` | `string.match()` where `regexp.exec()` is better |\n| `useFind` | `array.filter()[0]` instead of `array.find()` |\n| `useArraySortCompare` | `Array.sort()` without compare function |\n\n### noFloatingPromises\n\nThe most impactful type-aware rule. Detects unhandled promises:\n\n```ts\n// ERROR: floating promise\nasync function loadData() {\n  fetch(\"/api/data\");\n}\n\n// VALID: awaited\nasync function loadData() {\n  await fetch(\"/api/data\");\n}\n\n// VALID: explicitly voided (fire-and-forget)\nasync function loadData() {\n  void fetch(\"/api/data\");\n}\n```\n\nDetects ~75% of cases compared to typescript-eslint, improving each release. v2.4.12 added detection through cross-module generic wrapper functions (e.g. a generic `wrap(fn)` re-exported from another file).\n\n### React Compiler interaction with `useExhaustiveDependencies`\n\nIf you use the React Compiler, `useExhaustiveDependencies` cannot tell that the compiler is handling memoization for you. Many React Compiler users (including Biome contributors) disable the rule entirely:\n\n```json\n{\n  \"linter\": {\n    \"rules\": {\n      \"correctness\": {\n        \"useExhaustiveDependencies\": \"off\"\n      }\n    }\n  }\n}\n```\n\nIf you keep the rule on, expect to suppress effects that intentionally depend on a value but don't read it in the body (e.g. `location.pathname` to re-trigger on navigation).\n\n### Limitations vs typescript-eslint\n\n- Complex generic type inference may miss some cases\n- Not a full type checker - handles common patterns, not every edge case\n- Rules still in nursery - expect improvements with each release\n- Major performance advantage: fraction of tsc-based linting time\n\n## GritQL Custom Rules\n\nGritQL is a declarative pattern-matching language for custom lint rules. Create `.grit` files and register them as plugins.\n\n```json\n{ \"plugins\": [\"./lint-rules/no-object-assign.grit\"] }\n```\n\n### Examples\n\n**Ban `Object.assign`:**\n\n```grit\n`$fn($args)` where {\n    $fn <: `Object.assign`,\n    register_diagnostic(\n        span = $fn,\n        message = \"Prefer object spread instead of `Object.assign()`\"\n    )\n}\n```\n\n**CSS - enforce color classes:**\n\n```grit\nlanguage css;\n`$selector { $props }` where {\n    $props <: contains `color: $color` as $rule,\n    not $selector <: r\"\\.color-.*\",\n    register_diagnostic(\n        span = $rule,\n        message = \"Don't set explicit colors. Use `.color-*` classes instead.\"\n    )\n}\n```\n\n### Plugin API\n\n`register_diagnostic()` arguments:\n- `severity` - `\"hint\"`, `\"info\"`, `\"warn\"`, `\"error\"` (default: `\"error\"`)\n- `message` (required) - diagnostic message\n- `span` (required) - syntax node to highlight\n\nSupported target languages: JavaScript (default) and CSS, plus JSON since v2.4 (the v2.4 release blog adds JSON; the `linter/plugins/` reference page may still mention only JS/CSS - the blog is authoritative). Profile rule and plugin execution with `biome lint --profile-rules .`.\n\n## Suppression Patterns\n\n### Single-line\n\n```ts\n// biome-ignore lint/suspicious/noConsole: needed for debugging\nconsole.log(\"debug info\");\n```\n\n### File-level\n\n```ts\n// biome-ignore-all lint/suspicious/noConsole: logger module\n```\n\n### Range\n\n```ts\n// biome-ignore-start lint/style/useConst: legacy code\nlet x = 1;\nlet y = 2;\n// biome-ignore-end lint/style/useConst\nconst a = 4; // this line IS checked\n```\n\n`biome-ignore-end` is optional - omit to suppress until end of file. Biome requires explanation text after the colon.\n\n## Migration\n\n### From ESLint\n\n```bash\npnpm biome migrate eslint --write\npnpm biome migrate eslint --write --include-inspired  # Include non-identical rules\n```\n\nSupports legacy and flat configs, `extends` resolution, plugins (typescript-eslint, react, jsx-a11y, unicorn), `.eslintignore`.\n\n### From Prettier\n\n```bash\npnpm biome migrate prettier --write\n```\n\nMaps `tabWidth` -> `indentWidth`, `useTabs` -> `indentStyle`, `singleQuote` -> `quoteStyle`, `trailingComma` -> `trailingCommas`.\n\n### From ESLint + Prettier combo\n\n```bash\npnpm biome migrate eslint --write\npnpm biome migrate prettier --write\npnpm remove eslint prettier eslint-config-prettier eslint-plugin-prettier \\\n  @typescript-eslint/parser @typescript-eslint/eslint-plugin\nrm .eslintrc* .prettierrc* .eslintignore .prettierignore\n```\n\nEnable VCS integration since ESLint respects gitignore by default:\n\n```json\n{ \"vcs\": { \"enabled\": true, \"clientKind\": \"git\", \"useIgnoreFile\": true } }\n```\n\n## CLI Reference\n\n### biome check (primary command)\n\n```bash\nbiome check .                    # Check all files\nbiome check --write .            # Apply safe fixes\nbiome check --write --unsafe .   # Apply all fixes\nbiome check --changed .          # Only VCS-changed files\nbiome check --staged .           # Only staged files\n```\n\n### biome ci (CI mode)\n\n```bash\nbiome ci .                                           # No writes, exit code on errors\nbiome ci --reporter=github .                         # GitHub annotations\nbiome ci --reporter=sarif --reporter-file=report.sarif .  # SARIF output\n```\n\n### biome lint\n\n```bash\nbiome lint --only=suspicious/noDebugger .    # Single rule\nbiome lint --skip=project .                  # Skip domain\nbiome lint --only=types .                    # Only type-aware rules\nbiome lint --error-on-warnings .             # Warnings become errors\nbiome lint --enforce-assist .                # Fail when assist actions remain unapplied\nbiome lint --suppress --reason \"tracked in #123\" .  # Insert biome-ignore suppressions instead of fixes\n```\n\n`--enforce-assist` is useful in CI: import organization and other assist actions aren't lint diagnostics by default, so plain `biome ci` may pass even when imports are unsorted. Pair `--suppress` with `--reason` to bulk-add `biome-ignore` comments (Biome requires explanation text after the colon).\n\n### Other commands\n\n```bash\nbiome format --write .                       # Format only\nbiome search '`console.$method($args)`' .    # GritQL pattern search\nbiome rage                                   # Debug info for bug reports\nbiome explain noFloatingPromises             # Explain a rule\n```\n\n## Best Practices\n\n1. **Use `biome check` as your single command** - combines format, lint, and import organization\n2. **Start with `recommended: true`** - disable individual rules as needed\n3. **Enable relevant domains** - `react`, `next`, `test`, `types` based on your stack\n4. **Enable VCS integration** - respects `.gitignore`, enables `--changed`/`--staged`\n5. **Use `biome ci` in pipelines** - never writes files, clear exit codes\n6. **Pin exact versions** - avoid surprise rule changes between releases\n7. **Run `biome migrate --write` after every upgrade**\n8. **Use `--staged` in pre-commit hooks**: `biome check --staged --write --no-errors-on-unmatched .`\n9. **Profile slow rules** with `biome lint --profile-rules` (v2.4)\n10. **Use GritQL plugins** for project-specific patterns instead of disabling rules globally\n\n## Gotchas\n\nThese are real mistakes that have caused broken configs, dirty working trees, and wasted debugging time. Read before writing any Biome config.\n\n1. **`files.ignore`, `files.include`, `files.exclude` do not exist.** Only `files.includes` (with `s`). Biome will throw `Found an unknown key` for anything else. See the first critical rule above.\n\n2. **`organizeImports` is NOT a top-level config key.** In Biome 2.x it moved under `assist.actions.source.organizeImports`. Using it at the top level is a config error.\n\n3. **`overrides` that disable `linter` + `formatter` still run `assist`.** If you use overrides to skip a generated file, the import organizer (an assist action) will still rewrite it. This silently dirties your working tree. Use `files.includes` negation to fully exclude a file instead.\n\n4. **`overrides` field is `includes` (with `s`), not `include`.** Same naming as `files.includes`.\n\n5. **`biome check --write` runs formatter + linter + assists in one pass.** Any of these three can modify files. If a generated file keeps getting dirtied after `check --write`, check which subsystem is touching it - it's often the import organizer (assist), not the formatter or linter.\n\n6. **Prefer `--write` over `--fix`.** `--fix` is a documented alias for `--write` on `biome lint` and `biome format`, but `biome check` is the canonical entry point and `--write` is the documented flag everywhere. Pick `--write` and be consistent.\n\n7. **`package.json` infinite reformatting loop.** Biome's default JSON formatter uses tabs; `pnpm` (and several other tools) write `package.json` with 2-space indent. Each install rewrites it, then `biome check --write` rewrites it again, dirtying every commit. Fix by either excluding `package.json` (`\"!**/package.json\"` in `files.includes`) or overriding JSON to use spaces:\n\n   ```json\n   {\n     \"overrides\": [\n       {\n         \"includes\": [\"**/package.json\"],\n         \"json\": { \"formatter\": { \"indentStyle\": \"space\", \"indentWidth\": 2 } }\n       }\n     ]\n   }\n   ```\n\n## Resources\n\n- **Biome Docs**: https://biomejs.dev/\n- **Biome GitHub**: https://github.com/biomejs/biome\n- **GritQL Docs**: https://docs.grit.io/\n- **Biome v2 Blog**: https://biomejs.dev/blog/biome-v2/\n- **Biome v2.4 Blog**: https://biomejs.dev/blog/biome-v2-4/\n- **Migration Guide**: https://biomejs.dev/guides/migrate-eslint-prettier/\n- **Rules Reference**: https://biomejs.dev/linter/javascript/rules/\n- **Domains**: https://biomejs.dev/linter/domains/\n- **Plugins**: https://biomejs.dev/linter/plugins/\n\nFor detailed lint rules by category with code examples, see 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