biome

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

# Create biome.json configuration
npx @biomejs/biome init

# Check your project
npx @biomejs/biome check .

# Fix issues automatically
npx @biomejs/biome check --write .

# Format only
npx @biomejs/biome format --write .

# Lint only
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:

# Check all files
biome check .

# Fix issues automatically
biome check --write .

# Unsafe fixes (may change behavior)
biome check --write --unsafe .

# Apply suggested fixes
biome check --write --unsafe --apply-suggested

# Check specific files
biome check src/**/*.ts

# CI mode (exit with error on issues)
biome ci .