Bun is a fast all-in-one tool for JavaScript and TypeScript developers. It works as a runtime to run your code, a package manager to install dependencies, a bundler to build your project, and a test runner to check your work. Everything is built into one tool so you don't need separate programs.
You can use Bun instead of Node for new projects or scripts where speed matters. It runs on Vercel too. If you already have a Node project, you can migrate by swapping simple commands like bun install for npm install and bun run for npm run. Many existing packages work without changes.
Bun also has useful built-in features like bun test for writing tests with a familiar API, Bun.file for reading files, and Bun.serve for creating a web server. It keeps your workflow simple and fast.
Global
mkdir -p ~/.claude/skills/bun-runtimeProject
mkdir -p .claude/skills/bun-runtimeSource Repository
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