Bun Runtime

A comprehensive reference for Bun as a runtime, package manager, bundler, and test runner. It covers the key decision of when to use Bun over Node (speed matters, new projects, Vercel deployments) and when to stick with Node (maximum compatibility, legacy tooling). You get practical migration notes like swapping `node` for `bun run` and `npm install` for `bun install`, plus Vercel-specific config. The examples show file handling, the built-in server API, and Jest-like testing. Most useful when you're actively adopting Bun or debugging why a Node project won't run under it. The lockfile note is important: current Bun uses text `bun.lock`, older versions used binary `bun.lockb`.

Install to Claude Code

npx -y skills add affaan-m/ecc --skill bun-runtime --agent claude-code