Bun

Overview

Bun is a fast JavaScript runtime that bundles transpilation, package management, testing, and bundling in one tool. Treat it as a drop-in Node.js replacement with better startup times, first-class TypeScript/JSX support, built-in watch/hot reload modes, and tooling for producing standalone executables.

When to Trigger This Skill

• Users mention bun, bunx, bun test, or bun build
• Work requires Bun-specific runtime behavior, package installation, bundling, or testing
• Guidance is needed for Bun installation, upgrades, or cross-platform deployment
• Debugging Bun tasks, especially around databases, hot reload, or Node.js compatibility

Quick Start Checklist