tsdown

name: tsdown description: Use when bundling TypeScript libraries - provides tsdown configuration, dual ESM/CJS output, .d.ts generation, package validation, 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

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, exports, or validation
• references/features.md - if using shims, unbundle, watch mode, framework integrations, or WebAssembly
• references/advanced.md - if writing plugins, using linting/validation, 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