name: tsdown
description: tsdown fast TypeScript library bundler powered by Rolldown and Oxc. Use when bundling TypeScript libraries, configuring entry points, or generating .d.ts declaration files.
metadata:
author: Anthony Fu
version: '2026.1.28'
source: Generated from https://github.com/rolldown/tsdown, scripts located at https://github.com/antfu/skills
tsdown is a next-generation TypeScript library bundler built on Rolldown and Oxc. It provides blazing-fast builds, automatic .d.ts generation, and seamless migration from tsup. Supports Rolldown/Rollup/Unplugin plugins and features smart dependency handling.
The skill is based on tsdown v0.20.1, generated at 2026-01-28.
Anthony's Preferences:
- Build pure-ESM packages, avoid CJS
- Always enable
dts option for type declarations
- Enable
exports option for auto-generated package exports
Core
| Topic |
Description |
Reference |
| Configuration |
Config file setup, defineConfig, multiple configs |
core-config |
| CLI |
Command-line interface and options |
core-cli |
| Entry Points |
Entry files, aliases, glob patterns |
core-entry |
Build Options
| Topic |
Description |
Reference |
| Output |
Format (ESM/CJS/IIFE/UMD), directory, target, platform |
options-output |
| Declaration Files |
.d.ts generation, isolatedDeclarations, sourcemaps |
options-dts |
| Dependencies |
External, noExternal, dependency bundling |
options-dependencies |
| Package Exports |
Auto-generating exports, main, module fields |
options-package-exports |
Features
Advanced
Recipes
By