tsdown

name	tsdown
description	Use when bundling TypeScript libraries - provides tsdown configuration, dual ESM/CJS output, .d.ts generation, and plugin authoring
license	MIT

tsdown

Rolldown + Oxc powered TypeScript bundler. Drop-in tsup replacement.

When to Use

• Building TypeScript libraries
• Generating .d.ts declarations
• Publishing npm packages
• Dual ESM/CJS output
• Vue/React component libraries

Quick Start

npm i -D tsdown typescript

// tsdown.config.ts
import { defineConfig } from 'tsdown'

export default defineConfig({
  entry: 'src/index.ts',
  format: 'esm',
  dts: true,
  exports: true,
})

tsdown           # Build
tsdown --watch   # Watch mode

Reference Files

Task	File
Config file, CLI, entry points	config.md
Format, target, dts, exports	output.md
Shims, unbundle, watch, frameworks	features.md
Plugins, hooks, programmatic, migration	advanced.md

Loading Files

Consider loading these reference files based on your task:

• references/config.md - if setting up tsdown.config.ts, CLI, or entry points
• references/output.md - if configuring output format, target, .d.ts, or exports
• references/features.md - if using shims, unbundle, watch mode, or framework integrations
• references/advanced.md - if writing plugins, using programmatic API, or migrating from tsup

DO NOT load all files at once. Load only what's relevant to your current task.

Cross-Skill References

• Library patterns → Use ts-library skill
• Vue component libs → Use vue skill
• Package management → Use pnpm skill