Bun

This is a unified JavaScript runtime that replaces Node.js, npm, and your bundler with one fast binary. You'll reach for it when you want to run TypeScript directly without a build step, install packages 25x faster than npm, or bundle code for production. It handles the full cycle: run scripts, manage dependencies, build bundles, and run tests. The skill covers essential commands like bun run, bun install, and bun build, plus configuration via bunfig.toml and native APIs like Bun.serve() for HTTP servers. Skip it if you need exact Node.js compatibility for native modules or want TypeScript type checking, which still requires tsc. Otherwise, it's a legitimate drop-in replacement that actually delivers on the speed claims.