tsdown

Rolldown + Oxc powered TypeScript bundler with dual ESM/CJS output and .d.ts generation. Drop-in tsup replacement supporting TypeScript library bundling with automatic declaration file generation Configurable output formats (ESM, CJS, UMD), target environments, and package exports validation Includes watch mode, framework integrations (Vue, React), plugin authoring, and programmatic API for advanced workflows Built-in shims, unbundle mode, and WebAssembly support for specialized bundling scenarios

INSTALLATION
npx skills add https://github.com/onmax/nuxt-skills --skill tsdown
Run in your project or agent environment. Adjust flags if your CLI version differs.

SKILL.md

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, validation

output.md

Shims, unbundle, watch, frameworks, WASM

features.md

Plugins, hooks, lint, programmatic, migration

advanced.md

Loading Files

Consider loading these reference files based on your task:

  • 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
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