Bun

ELI5 — The Vibe Check

Bun is the new kid on the JavaScript block who showed up and immediately started doing everything faster than Node. It's a runtime, a bundler, a package manager, and a test runner — all in one speedy little package.

Real Talk

An all-in-one JavaScript and TypeScript runtime built from scratch using Zig and JavaScriptCore (Safari's engine). Bun includes a native bundler, transpiler, task runner, npm-compatible package manager, and test runner, all optimized for speed.

Show Me The Code

// bun install is 25x faster than npm install
// bun run dev — starts your dev server

Bun.serve({
  port: 3000,
  fetch(req) {
    return new Response("Hello from Bun!");
  },
});

When You'll Hear This

"Switched to Bun and our install times went from 45 seconds to 2 seconds." / "Bun's built-in test runner means we don't need Jest anymore."