bunup

An extremely fast, zero-config bundler for TypeScript & JavaScript, powered by Bun and Oxc.

Bundler	Format	Build Time	Relative Speed
bunup	esm, cjs	6ms	⚡️ 9.7x faster
bunup (+ dts)	esm, cjs	32ms	⚡️ 25.8x faster
tsdown	esm, cjs	22ms	2.6x faster
tsdown (+ dts)	esm, cjs	52ms	15.9x faster
tsup	esm, cjs	58ms	baseline
tsup (+ dts)	esm, cjs	825ms	baseline

Lower build time is better. Benchmark run on the same code with identical output formats.

🚀 Quick Start

Installation

# Using Bun
bun add bunup -d

# Using pnpm
pnpm add bunup -D

# Using npm
npm i bunup -D

# Using Yarn
yarn add bunup --dev

Basic Usage

Create a simple TypeScript file:

// src/index.ts
export function greet(name: string): string {
      return `Hello, ${name}!`;
}

Bundle it with bunup:

bunup src/index.ts

This will create a bundled output in the dist directory.

Using with package.json

Add a build script to your package.json:

{
      "name": "my-package",
      "scripts": {
            "build": "bunup src/index.ts --format esm,cjs --dts"
      }
}

Then run:

npm run build

⚙️ Configuration File

Create a bunup.config.ts file for more control:

import {defineConfig} from 'bunup';

export default defineConfig({
      entry: ['src/index.ts'],
      outDir: 'dist',
      format: ['esm', 'cjs'],
      dts: true,
      minify: true,
});

📚 Documentation

For complete documentation, visit the full documentation.

❤️ Contributing

For guidelines on contributing, please read the contributing guide.

We welcome contributions from the community to enhance Bunup's capabilities and make it even more powerful.