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.

skills.sh installs: 166
GitHub stars: 234
last updated: Jun 3, 2026

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Install

$ npx -y skills add flora131/atomic --skill bun --agent claude-code

Installs into .claude/skills of the current project.

Files

Bun Skill Reference

Product Summary

Bun is a unified JavaScript runtime, package manager, bundler, and test runner written in Zig. It replaces Node.js, npm, esbuild, and Jest with a single fast binary. Key files: bunfig.toml (configuration), bun.lock (lockfile), package.json (project metadata). Primary commands: bun run, bun install, bun build, bun test. Bun is 4x faster than Node.js on startup and 25x faster than npm for installations. Visit https://bun.com/docs for comprehensive documentation.