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name biome description Biome - Fast all-in-one toolchain for web projects (linter + formatter in Rust, 100x faster than ESLint) user-invocable false disable-model-invocation true version 1.0.0 category toolchain author Claude MPM Team license MIT progressive_disclosure {"entry_point":{"summary":"Fast all-in-one linter and formatter (Rust-based replacement for ESLint + Prettier)","when_to_use":["When you need fast linting and formatting","When replacing ESLint + Prettier","When working with TypeScript/JavaScript","When you want zero-config setup"],"quick_start":["npm install --save-dev @biomejs/biome","npx @biomejs/biome init","npx @biomejs/biome check --write ."]}} context_limit 700 tags ["biome","linting","formatting","code-quality","tooling","typescript","javascript"] requires_tools []
Biome - Fast All-in-One Toolchain
Overview
Biome is a fast, all-in-one toolchain for web projects written in Rust. It replaces both ESLint and Prettier with a single tool that's 100x faster and provides zero-config defaults.
Key Features :
Single tool for linting and formatting
100x faster than ESLint
Zero configuration by default
Built-in import sorting
TypeScript-first design
Partial Prettier compatibility
Native monorepo support
VS Code integration
Installation :
npm install --save-dev @biomejs/biome
Quick Start
1. Initialize Biome
npx @biomejs/biome init
npx @biomejs/biome check .
npx @biomejs/biome check --write .
npx @biomejs/biome format --write .
npx @biomejs/biome lint .
2. Package.json Scripts
{
"scripts" : {
"check" : "biome check ." ,
"check:write" : "biome check --write ." ,
"format" : "biome format --write ." ,
"lint" : "biome lint ." ,
"lint:fix" : "biome lint --write ."
}
}
3. Basic Configuration
{
"$schema"
:
"https://biomejs.dev/schemas/1.9.4/schema.json"
,
"vcs"
:
{
"enabled"
:
true
,
"clientKind"
:
"git"
,
"useIgnoreFile"
:
true
}
,
"files"
:
{
"ignoreUnknown"
:
false
,
"ignore"
:
[
"node_modules"
,
"dist"
,
"build"
,
".next"
]
}
,
"formatter"
:
{
"enabled"
:
true
,
"indentStyle"
:
"space"
,
"indentWidth"
:
2
,
"lineWidth"
:
100
}
,
"linter"
:
{
"enabled"
:
true
,
"rules"
:
{
"recommended"
:
true
}
}
,
"javascript"
:
{
"formatter"
:
{
"quoteStyle"
:
"single"
,
"semicolons"
:
"asNeeded"
,
"trailingCommas"
:
"all"
}
}
}
Core Commands
Check Command (Recommended) The check command runs both linting and formatting:
biome check .
biome check --write .
biome check --write --unsafe .
biome check --write --unsafe --apply-suggested
biome check src/**/*.ts
biome ci .
Format Command Format code without linting:
biome format --write .
biome format .
biome format --write src/**/*.{ts,tsx,js,jsx}
echo "const x={a:1}" | biome format --stdin-file-path=file.js
Lint Command Lint code without formatting:
biome lint .
biome lint --write .
biome lint --verbose .
biome lint --write --unsafe .
Configuration Deep Dive
Formatter Configuration {
"formatter" : {
"enabled" : true ,
"formatWithErrors" : false ,
"indentStyle" : "space" ,
"indentWidth" : 2 ,
"lineEnding" : "lf" ,
"lineWidth" : 80 ,
"attributePosition" : "auto"
} ,
"javascript" : {
"formatter" : {
"quoteStyle" : "single" ,
"jsxQuoteStyle" : "double" ,
"quoteProperties" : "asNeeded" ,
"trailingCommas" : "all" ,
"semicolons" : "asNeeded" ,
"arrowParentheses" : "always" ,
"bracketSpacing" : true ,
"bracketSameLine" : false }
} ,
"json" : {
"formatter" : {
"trailingCommas" : "none"
}
}
}
Linter Configuration {
"linter" : {
"enabled" : true ,
"rules" : {
"recommended" : true ,
"a11y" : {
"recommended" : true ,
"noAutofocus" : "error" ,
"useKeyWithClickEvents" : "warn"
} ,
"complexity" : {
"recommended" : true ,
"noForEach" : "off" ,
"useLiteralKeys" : "error"
} ,
"correctness" : {
"recommended" : true ,
"noUnusedVariables" : "error" ,
"useExhaustiveDependencies" : "warn"
} ,
"performance" : {
"recommended" : true ,
"noAccumulatingSpread" : "warn"
} ,
"security" : {
"recommended" : true ,
"noDangerouslySetInnerHtml" : "error"
} ,
"style" : {
"recommended" : true ,
"noNonNullAssertion" : "warn" ,
"useConst" : "error" ,
"useTemplate" : "warn"
} ,
"suspicious" : {
"recommended" : true ,
"noExplicitAny" : "warn" ,
"noArrayIndexKey" : "error"
}
}
}
}
File Ignore Patterns {
"files" : {
"ignore" : [
"node_modules" ,
"dist" ,
"build" ,
".next" ,
"coverage" ,
"*.min.js" ,
"public/assets/**"
] ,
"ignoreUnknown" : false ,
"include" : [ "src/**/*.ts" , "src/**/*.tsx" ]
}
}
Override Configuration for Specific Files {
"overrides" : [
{
"include" : [ "**/*.test.ts" , "**/*.spec.ts" ] ,
"linter" : {
"rules" : {
"suspicious" : {
"noExplicitAny" : "off"
}
}
}
} ,
{
"include" : [ "scripts/**/*.js" ] ,
"formatter" : {
"lineWidth" : 120
}
}
]
}
VS Code Integration
1. Install Biome Extension
code --install-extension biomejs.biome
2. VS Code Settings (.vscode/settings.json) {
"[javascript]" : {
"editor.defaultFormatter" : "biomejs.biome" ,
"editor.formatOnSave" : true ,
"editor.codeActionsOnSave" : {
"quickfix.biome" : "explicit" ,
"source.organizeImports.biome" : "explicit"
}
} ,
"[typescript]" : {
"editor.defaultFormatter" : "biomejs.biome" ,
"editor.formatOnSave" : true ,
"editor.codeActionsOnSave" : {
"quickfix.biome" : "explicit" ,
"source.organizeImports.biome" : "explicit"
}
} ,
"[typescriptreact]" : {
"editor.defaultFormatter" : "biomejs.biome" ,
"editor.formatOnSave" : true } ,
"[json]" : {
"editor.defaultFormatter" : "biomejs.biome" ,
"editor.formatOnSave" : true } ,
"biome.lspBin" : "./node_modules/@biomejs/biome/bin/biome"
}
3. Workspace Settings {
"editor.formatOnSave" : true ,
"editor.formatOnPaste" : true ,
"editor.defaultFormatter" : "biomejs.biome" ,
"biome.rename" : true ,
"files.autoSave" : "onFocusChange"
}
Migration from ESLint and Prettier
1. Remove Old Tools
npm uninstall eslint prettier eslint-config-prettier \
eslint-plugin-react eslint-plugin-import \
@typescript-eslint/parser @typescript-eslint/eslint-plugin
rm .eslintrc.js .eslintrc.json .prettierrc .prettierignore
2. Migrate Configuration Use Biome's migration tool:
biome migrate prettier --write
biome migrate eslint --write
3. Manual Migration Prettier → Biome Formatter :
{
"semi" : false ,
"singleQuote" : true ,
"trailingComma" : "all" ,
"printWidth" : 100
}
{
"formatter" : {
"lineWidth" : 100
} ,
"javascript" : {
"formatter" : {
"semicolons" : "asNeeded" ,
"quoteStyle" : "single" ,
"trailingCommas" : "all"
}
}
}
{
"rules" : {
"no-unused-vars" : "error" ,
"prefer-const" : "warn"
}
}
{
"linter" : {
"rules" : {
"correctness" : {
"noUnusedVariables" : "error"
} ,
"style" : {
"useConst" : "warn"
}
}
}
}
4. Update Scripts {
"scripts" : {
"lint" : "biome lint ." ,
"lint:fix" : "biome lint --write ." ,
"format" : "biome format --write ." ,
"check" : "biome check --write ."
}
}
Git Hooks Integration
Using Husky + lint-staged
npm install --save-dev husky lint-staged
npx husky init
#!/usr/bin/env sh
. "$(dirname -- "$0 " ) /_/husky.sh"
npx lint-staged
{
"lint-staged" : {
"*.{js,ts,jsx,tsx,json}" : [
"biome check --write --no-errors-on-unmatched"
]
}
}
Using Lefthook pre-commit:
commands:
lint:
glob: "*.{js,ts,jsx,tsx,json}"
run: biome check --write --no-errors-on-unmatched {staged_files }
Simple Git Hook (no dependencies) #!/bin/bash
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(js|ts|jsx|tsx|json)$' )
if [ -n "$STAGED_FILES " ]; then
echo "Running Biome on staged files..."
npx @biomejs/biome check --write --no-errors-on-unmatched $STAGED_FILES
git add $STAGED_FILES
fi
CI/CD Integration
GitHub Actions name: Biome CI
on:
push:
branches: [main , develop ]
pull_request:
branches: [main ]
jobs:
biome:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Setup Node.js
uses: actions/setup-node@v4
with:
node-version: '20'
cache: 'npm'
- name: Install dependencies
run: npm ci
- name: Run Biome CI
run: npx @biomejs/biome ci .
- name: Check formatting
run: npx @biomejs/biome format .
- name: Lint
run: npx @biomejs/biome lint .
GitLab CI biome:
image: node:20-alpine
stage: test
script:
- npm ci
- npx @biomejs/biome ci .
cache:
paths:
- node_modules/
only:
- merge_requests
- main
CircleCI version: 2.1
jobs:
biome:
docker:
- image: cimg/node:20.11
steps:
- checkout
- restore_cache:
keys:
- deps-{{ checksum "package-lock.json" }}
- run: npm ci
- save_cache:
paths:
- node_modules
key: deps-{{ checksum "package-lock.json" }}
- run: npx @biomejs/biome ci .
workflows:
test:
jobs:
- biome
Import Sorting Biome includes built-in import sorting:
biome check --write --organize-imports-enabled=true .
{
"organizeImports" : {
"enabled" : true }
}
import { useState } from 'react' ;
import axios from 'axios' ;
import { Button } from './components/Button' ;
import type { User } from './types' ;
import './styles.css' ;
import type { User } from './types' ;
import axios from 'axios' ;
import { useState } from 'react' ;
import { Button } from './components/Button' ;
import './styles.css' ;
TypeScript Support Biome has first-class TypeScript support:
{
"linter" : {
"rules" : {
"suspicious" : {
"noExplicitAny" : "warn" ,
"noUnsafeDeclarationMerging" : "error"
} ,
"correctness" : {
"noUnusedVariables" : "error"
} ,
"style" : {
"useImportType" : "error" ,
"useExportType" : "error"
}
}
}
}
const unused = 123 ;
import { User } from './types' ;
import type { User } from './types' ;
const num = "123" as any as number ;
Monorepo Support Biome works great in monorepos:
Project Structure my-monorepo/
├── biome.json (root config)
├── packages/
│ ├── web/
│ │ └── biome.json (extends root)
│ ├── api/
│ │ └── biome.json
│ └── shared/
│ └── biome.json
Root Configuration {
"$schema" : "https://biomejs.dev/schemas/1.9.4/schema.json" ,
"extends" : [ ] ,
"formatter" : {
"enabled" : true ,
"indentStyle" : "space" ,
"indentWidth" : 2
} ,
"linter" : {
"enabled" : true ,
"rules" : {
"recommended" : true }
}
}
Package Override {
"extends" : [ "../../biome.json" ] ,
"formatter" : {
"lineWidth" : 100
} ,
"linter" : {
"rules" : {
"style" : {
"noNonNullAssertion" : "off"
}
}
}
}
Monorepo Scripts {
"scripts" : {
"check" : "biome check ." ,
"check:packages" : "biome check packages/*" ,
"format" : "biome format --write ." ,
"lint" : "biome lint packages/*"
}
}
Performance Benefits
Speed Comparison Tool Time (10,000 files) ESLint + Prettier ~60s Biome ~0.6s
100x faster on average workloads.
Caching Biome includes intelligent caching:
biome check .
biome check .
rm -rf node_modules/.cache/biome
Parallel Processing Biome uses all CPU cores by default:
biome check --max-diagnostics=50 .
biome check --verbose .
Common Patterns
React Projects {
"linter" : {
"rules" : {
"a11y" : {
"recommended" : true ,
"useButtonType" : "error" ,
"useKeyWithClickEvents" : "error"
} ,
"correctness" : {
"useExhaustiveDependencies" : "warn" ,
"useHookAtTopLevel" : "error"
} ,
"suspicious" : {
"noArrayIndexKey" : "error"
}
}
} ,
"javascript" : {
"formatter" : {
"jsxQuoteStyle" : "double"
}
}
}
Next.js Projects {
"files" : {
"ignore" : [ ".next" , "out" , "node_modules" ]
} ,
"overrides" : [
{
"include" : [ "app/**/*.tsx" , "pages/**/*.tsx" ] ,
"linter" : {
"rules" : {
"a11y" : {
"recommended" : true }
}
}
}
]
}
Node.js Backend {
"linter" : {
"rules" : {
"security" : {
"recommended" : true ,
"noGlobalEval" : "error"
} ,
"correctness" : {
"noUnusedVariables" : "error"
}
}
} ,
"javascript" : {
"formatter" : {
"semicolons" : "always"
}
}
}
Best Practices
Use biome check instead of separate format/lint commandsEnable --write flag for automatic fixesConfigure VS Code for format-on-saveAdd git hooks to enforce quality before commitsUse CI mode (biome ci) in continuous integrationStart with recommended rules then customizeLeverage import sorting to organize imports automaticallyUse overrides for different file types or directoriesEnable VCS integration to respect .gitignoreKeep configuration minimal - Biome has smart defaults
Troubleshooting
Biome Not Formatting
biome rage
biome check --verbose src/file.ts
Conflicts with Prettier
"[javascript]" : {
"editor.defaultFormatter" : "biomejs.biome"
}
npm uninstall prettier
Performance Issues
biome rage
rm -rf node_modules/.cache/biome
biome check --max-diagnostics=20 .
Rule Configuration Not Working
{
"linter" : {
"rules" : {
"correctness" : {
"noUnusedVariables" : "error"
}
}
}
}
Local Biome Configs (Your Repos) Patterns from active projects:
ai-code-review/biome.json: files.includes targets src/**/*.ts and excludes tests, lineWidth: 100, single quotes, semicolons always, and noExplicitAny: warn.itinerizer-ts/biome.json: files.ignore includes node_modules, dist, .claude, and data directories; organizeImports.enabled = true.matsuoka-com and diogenes use similar formatting defaults (2-space indent, lineWidth 100). {
"lint" : "biome check src/ --diagnostic-level=error" ,
"lint:fix" : "biome check src/ --write" ,
"format" : "biome format src/ --write"
}
Resources
Summary
Biome is a fast all-in-one linter and formatter100x faster than ESLint + PrettierZero config by default with smart defaultsBuilt in Rust for maximum performanceTypeScript-first with excellent type supportImport sorting included out of the boxVS Code integration with official extensionPerfect for modern web projects, monorepos, CI/CDEasy migration from ESLint and Prettier 