biome-formatting

# Biome Formatting

Master Biome's fast code formatter for JavaScript, TypeScript, JSON, and other supported languages with consistent style enforcement.

## Overview

Biome's formatter provides opinionated, fast code formatting similar to Prettier but with better performance. It's written in Rust and designed to format code consistently across teams.

## Core Commands

### Basic Formatting

```bash
# Format files and write changes
biome format --write .

# Format specific files
biome format --write src/**/*.ts

# Check formatting without fixing
biome format .

# Format stdin
echo "const x={a:1}" | biome format --stdin-file-path="example.js"
```

### Combined Operations

```bash
# Lint and format together
biome check --write .

# Only format (skip linting)
biome format --write .

# CI mode (check both lint and format)
biome ci .
```

## Formatter Configuration

### Global Settings

```json
{
  "formatter": {
    "enabled": true,
    "formatWithErrors": false,
    "indentStyle": "space",
    "indentWidth": 2,
    "lineEnding": "lf",
    "lineWidth": 80,
    "attributePosition": "auto"
  }
}
```

Options:

- `enabled`: Enable/disable formatter (default: true)
- `formatWithErrors`: Format even with syntax errors (default: false)
- `indentStyle`: "space" or "tab" (default: "tab")
- `indentWidth`: Number of spaces, typically 2 or 4 (default: 2)
- `lineEnding`: "lf", "crlf", or "cr" (default: "lf")
- `lineWidth`: Maximum line length (default: 80)
- `attributePosition`: "auto" or "multiline" for HTML/JSX

### Recommended Configuration

```json
{
  "formatter": {
    "enabled": true,
    "indentStyle": "space",
    "indentWidth": 2,
    "lineEnding": "lf",
    "lineWidth": 100
  }
}
```

## Language-Specific Formatting

### JavaScript/TypeScript

```json
{
  "javascript": {
    "formatter": {
      "enabled": true,
      "quoteStyle": "single",
      "jsxQuoteStyle": "double",
      "quoteProperties": "asNeeded",
      "trailingCommas": "all",
      "semicolons": "always",