tsdown

by antfu 5.8k MIT Updated Jun 23, 2026
tsdown skill by antfu
tsdown — Frontend skill by antfu

tsdown is an open-source frontend skill for Claude Code and compatible agents, published by antfu. Its author describes it as: “Bundle TypeScript and JavaScript libraries with blazing-fast speed powered by Rolldown. Use when building libraries, generating type declarations, bundling for multiple formats, or migrating from tsup.”. The project has 5.8k stars on GitHub and is available under the MIT license. Add it to your setup with `git clone https://github.com/antfu/skills ~/.claude/skills/tsdown`.

What tsdown does

Blazing-fast bundler for TypeScript/JavaScript libraries powered by Rolldown and Oxc.

Installation

Add tsdown to your agent with:

git clone https://github.com/antfu/skills ~/.claude/skills/tsdown

Always review a skill's source before installing it. This command comes from the skill's public repository; the linked repo is the source of truth for exact setup steps.

What's inside

The SKILL.md for tsdown is organised into these sections:

  • Runtime Requirement
  • When to Use
  • Quick Start
  • Basic Configuration
  • Core References
  • Build Options
  • Dependency Handling
  • Output Enhancement
  • Framework & Runtime Support
  • Common Patterns
  • Basic Library Bundle
  • Multiple Entry Points

When to use it

Reach for tsdown when you want frontend help from your agent without writing the same instructions every session. Load the skill and the agent picks it up automatically for relevant tasks.

Strengths

  • Clear MIT license — safe to read and adapt
  • Ships in antfu/skills, an established project with 5,770 GitHub stars
  • Actively maintained (recent commits)

Topics

agent-skillsskills

Frequently asked questions

What does tsdown do?
Bundle TypeScript and JavaScript libraries with blazing-fast speed powered by Rolldown. Use when building libraries, generating type declarations, bundling for multiple formats, or migrating from tsup.
How do I install tsdown?
Run git clone https://github.com/antfu/skills ~/.claude/skills/tsdown in your agent, then reload your skills. Review the source at https://github.com/antfu/skills before installing.
Is tsdown free to use?
Yes. tsdown is free and open source under the MIT license, so you can read, run, and adapt it within that license's terms.
Where does tsdown come from?
tsdown ships inside antfu/skills, a repository that contains 19 catalogued skills in total. The repository's 5,770 GitHub stars apply to that whole collection, not to this skill on its own.

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