Bun Runtime

ELI5 — The Vibe Check

Bun is the new kid that wants to replace Node.js, npm, and webpack all at once. It's written in Zig, it's insanely fast, and it runs TypeScript natively without a build step. It's like someone looked at the JavaScript ecosystem and said 'I can do ALL of that, but faster.'

Real Talk

Bun is an all-in-one JavaScript runtime, bundler, transpiler, and package manager built with Zig and JavaScriptCore. It provides native TypeScript/JSX support, a built-in test runner, and Node.js API compatibility. It's designed as a drop-in replacement for Node.js with significantly better startup time and throughput.

Show Me The Code

// No build step needed - run TypeScript directly
// bun run server.ts
Bun.serve({
  port: 3000,
  fetch(req) {
    return new Response('Hello from Bun!');
  }
});

When You'll Hear This

"Bun installed our node_modules in 0.2 seconds instead of 30." / "We switched to Bun and our test suite runs 5x faster."