Bun 2.0 - The JavaScript Runtime That Changes Everything

# Install on Windows
powershell -c "irm bun.sh/install.ps1 | iex"

# Run your projects
bun run dev

# Install dependencies (faster than npm, yarn, pnpm)
bun install

# Add packages
bun add react next typescript

# Run scripts
bun run build

// bun.build.ts
await Bun.build({
  entrypoints: ['./src/index.tsx'],
  outdir: './dist',
  minify: true,
  splitting: true,
  sourcemap: 'external',
});

// math.test.ts
import { expect, test, describe } from 'bun:test';

describe('math', () => {
  test('addition', () => {
    expect(2 + 2).toBe(4);
  });
});

bun test

import { Database } from 'bun:sqlite';

const db = new Database('app.db');
db.run('CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT)');

const users = db.query('SELECT * FROM users').all();

# Create Next.js app with Bun
bun create next-app my-app

# Run development server
cd my-app
bun run dev

// React component with instant HMR
export function Counter() {
  const [count, setCount] = useState(0);
  return <button onClick={() => setCount(count + 1)}>{count}</button>;
}

// Changes reflect in <10ms

// config.ts
export const config = {
  apiUrl: Bun.env.API_URL,
  buildTime: new Date().toISOString(),
} as const;

// main.ts - config is inlined at build time
import { config } from './config' with { type: 'macro' };
console.log(config.buildTime); // Becomes a static string