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Guide Introduction · Tsdown · antfu/skills · Skills Docs

Repo No. 94 · Tsdown

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19 skills · 40 min

Skill 08 · Tsdown

Subchapter 8.8

Guide Introduction

references/guide-introduction.mdMarkdown2 KBView on GitHub

Introduction

tsdown is The Elegant Library Bundler — a fast, simple bundler for TypeScript and JavaScript libraries powered by Rolldown (Rust-based).

Why tsdown?

8Up to skill 8Tsdown

On this page

Introduction
Why tsdown?
Plugin Ecosystem
What Can It Bundle?
Key Differences from Rolldown
Prior Arts
Related

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Number: 8.8
Position: 8 of 41
Type: Markdown
Size: 2 KB

Nearby

Previous Guide Getting Started
Next Guide Migrate From Tsup

Source

Built on Rolldown (opens in a new tab), tsdown provides a complete out-of-the-box solution for library authors:

Simplified Configuration: Sensible defaults for library development, minimal boilerplate
Library-Specific Features: Auto TypeScript declarations, multiple output formats, package validation
Future-Ready: Official Rolldown project, foundation for Rolldown Vite’s Library Mode

Plugin Ecosystem

Supports the full Rolldown plugin ecosystem plus most Rollup plugins. See Plugins.

What Can It Bundle?

TypeScript/JavaScript: .ts, .js with modern syntax
TypeScript Declarations: Auto-generate .d.ts files
Multiple Formats: esm, cjs, iife, umd
Assets: .json, .wasm, CSS files
Built-in tree shaking, minification, and source maps

Key Differences from Rolldown

tsdown wraps Rolldown with library-specific features:

Auto-external dependencies, peerDependencies, and optionalDependencies from package.json
DTS generation
package.json exports field generation
Watch mode with keyboard shortcuts
CSS preprocessing pipeline
Executable bundling (SEA)

Prior Arts

Inspired by: Rollup, esbuild, tsup, unbuild. Powered by Rolldown.

Related

Getting Started - Installation and first build
Migrate from tsup - Migration guide

ReferenceGuide Getting Started ReferenceGuide Migrate From Tsup

references/guide-introduction.md

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