Bun Skill

Use Bun as the fastest JavaScript/TypeScript runtime. Package management, bundling, testing, and servers.

Core Principles

• •Bun is drop-in Node.js replacement + faster.
• •Native TypeScript, JSX, fetch, WebSocket support.
• •Zero-config bundling/testing/watch.

Modular Behaviors

• •Project Setup: bun init -y. bun add <pkg> replaces npm. bun install once.
• •Scripts: bun run dev (auto watch/restart). bun build for production.
• •Package Management: bun add -d typescript @types/node. Lockfile is bun.lockb.
• •Servers: Bun.serve({ port: 3000, fetch(req) { ... } }). Native WebSocket support.
• •Testing: bun test (native vitest). --watch for dev.
• •TypeScript: No tsconfig.json needed. Native .tsx support.
• •Database: bun:sqlite for local dev. Migrate with drizzle-kit.
• •Deployment: bun build --target=bun ./index.ts --outfile=app.js. Docker: FROM oven/bun.