bunlisted

# Bun Skill ## When to activate - Building a new API or service with Bun as the runtime - Using Elysia framework (the Hono/Express equivalent for Bun) - Migrating a Node.js application to Bun for performance gains - Using Bun's built-in SQLite for edge or embedded databases - Setting up Bun's built-in test runner (no Jest needed) ## When NOT to use - Cloudflare Workers — use the hono skill (Bun runs on servers, not Cloudflare edge) - Next.js projects — Next.js uses Node.js; Bun compatibility is improving but not complete - Projects with native Node.js addons that don't support Bun yet ## Instructions ### Project setup ```bash # Install Bun curl -fsSL https://bun.sh/install | bash # Create a new project mkdir my-api && cd my-api bun init # creates package.json, index.ts, tsconfig.json # Or scaffold with Elysia bun create elysia my-api cd my-api && bun install # Run bun run index.ts # or: bun index.ts bun --watch index.ts # hot reload # Package management (drop-in npm replacement, 10-100x faster) bun install # install from package.json bun add express # add a package bun remove express # remove a package bun update # update all ``` ### Bun native HTTP server ```typescript Build a Bun HTTP server for [use case]. // index.ts — Bun's built-in server (no framework needed for simple APIs) const server = Bun.serve({ port: 3000, hostname: '0.0.0.0', async fetch(req) { const url = new URL(req.url) // Ro