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@jabworks/prettier-config

Opinionated Prettier configuration with essential plugins for modern JavaScript, TypeScript, and JSON formatting.

Features

• Modern formatting rules optimized for readability and consistency
• Plugin integration for enhanced formatting capabilities:
  • 🎨 Tailwind CSS - Automatic class sorting and optimization
  • 📦 Package.json - Consistent package.json formatting
  • 🔤 JSON sorting - Alphabetical key sorting for better diffs
• TypeScript support with proper import/export handling
• Configurable overrides for different file types

Installation

# npm
npm install -D @jabworks/prettier-config

# pnpm
pnpm add -D @jabworks/prettier-config

# yarn
yarn add -D @jabworks/prettier-config

Peer Dependencies

This package requires the following peer dependencies to be installed:

npm install -D prettier prettier-plugin-packagejson prettier-plugin-sort-json prettier-plugin-tailwindcss

Usage

Method 1: Prettier Configuration File (Recommended)

Create a prettier.config.mjs file in your project root:

import { config } from '@jabworks/prettier-config';

export default config;

Or using CommonJS:

const { config } = require('@jabworks/prettier-config');

module.exports = config;

Method 2: Package.json

Add to your package.json:

{
	"prettier": "@jabworks/prettier-config"
}

Note: This method doesn't support extending or customizing the configuration.

Method 3: Custom Configuration

Extend the base configuration with your own rules:

import { config } from '@jabworks/prettier-config';

export default {
	...config,
	// Your custom overrides
	printWidth: 100,
	semi: false,
};

Configuration Details

This configuration includes the following settings:

Formatting Rules

{
  arrowParens: 'avoid',           // (a) => a instead of (a) => a
  bracketSameLine: false,         // Closing > on new line
  bracketSpacing: true,           // { foo } instead of {foo}
  endOfLine: 'lf',               // Unix line endings
  jsxSingleQuote: true,          // Single quotes in JSX
  printWidth: 120,               // Line length limit
  quoteProps: 'as-needed',       // Quote object properties only when needed
  semi: true,                    // Always add semicolons
  singleAttributePerLine: true,  // Each JSX attribute on its own line
  singleQuote: true,             // Single quotes for strings
  tabWidth: 2,                   // 2 spaces for indentation
  trailingComma: 'all',          // Trailing commas everywhere
  useTabs: false,                // Use spaces instead of tabs
}

Plugins

• prettier-plugin-tailwindcss: Automatically sorts Tailwind CSS classes
• prettier-plugin-sort-json: Sorts JSON object keys alphabetically (except package.json)
• prettier-plugin-packagejson: Formats package.json with standard key order

File-Specific Overrides

• JSON files (excluding package.json): Uses prettier-plugin-sort-json for key sorting
• Package.json files: Uses prettier-plugin-packagejson for standard formatting

Examples

Before/After Formatting

JavaScript/TypeScript:

// Before
const example = { c: 1, a: 2, b: 3, longKey: 4 };
function test( a,  b, c ) {
	return a + b + c;
}

// After
const example = { c: 1, a: 2, b: 3, longKey: 4 };
function test(a, b, c) {
	return a + b + c;
}

JSON:

// Before
{
  "version": "1.0.0",
  "name": "my-package",
  "dependencies": {
    "z-lib": "1.0.0",
    "a-lib": "2.0.0"
  }
}

// After
{
  "name": "my-package",
  "version": "1.0.0",
  "dependencies": {
    "a-lib": "2.0.0",
    "z-lib": "1.0.0"
  }
}

Tailwind CSS:

// Before
<div className="text-red-500 p-4 bg-blue-100 hover:bg-blue-200 flex items-center">

// After
<div className="flex items-center bg-blue-100 p-4 text-red-500 hover:bg-blue-200">

IDE Integration

VS Code

1. Install the Prettier extension
2. Add to your VS Code settings:

{
	"[javascript]": {
		"editor.defaultFormatter": "esbenp.prettier-vscode"
	},
	"[json]": {
		"editor.defaultFormatter": "esbenp.prettier-vscode"
	},
	"[typescript]": {
		"editor.defaultFormatter": "esbenp.prettier-vscode"
	},
	"editor.defaultFormatter": "esbenp.prettier-vscode",
	"editor.formatOnSave": true
}

Scripts

Add these scripts to your package.json:

{
	"scripts": {
		"format": "prettier --write .",
		"format:check": "prettier --check ."
	}
}

Compatibility

• Prettier: >=3.8.1

License

MIT

Contributing

This package is part of the @jabworks style guide monorepo. Please refer to the main repository for contribution guidelines.