How do I install the Tsdown skill?

Run npx skillmds@latest add tomevault-io/tsdown-4 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Tsdown safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Tsdown?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Tsdown free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Tsdown?

tomevault-io (@tomevault-io) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Tsdown by tomevault-io — Agent Skill

Name: Tsdown
Author: tomevault-io

File contents

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

Topic	Description	Reference
Optimization	Tree shaking, minification, sourcemaps	features-optimization
Shims	CJS/ESM compatibility shims	features-shims
Unbundle Mode	Bundleless transpile-only builds	features-unbundle
Watch Mode	Auto-rebuild on file changes	features-watch

Advanced

Topic	Description	Reference
Plugins	Rolldown, Unplugin, Rollup, Vite plugins	advanced-plugins
Hooks	Build lifecycle hooks	advanced-hooks
Programmatic API	Using tsdown from code	advanced-programmatic
Rolldown Options	Customizing inputOptions and outputOptions	advanced-rolldown-options

Recipes

Topic	Description	Reference
Framework Support	Vue and React library bundling	recipes-frameworks
Migration	Migrating from tsup	recipes-migration

Converted and distributed by TomeVault — claim your Tome and manage your conversions.

---name: tsdown-4description: tsdown fast TypeScript library bundler powered by Rolldown and Oxc. Use when bundling TypeScript libraries, configuring entry points, or generating .d.ts declaration files. Use when this capability is needed.---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](references/core-config.md) || CLI | Command-line interface and options | [core-cli](references/core-cli.md) || Entry Points | Entry files, aliases, glob patterns | [core-entry](references/core-entry.md) |## Build Options| Topic | Description | Reference || ----------------- | ------------------------------------------------------ | ---------------------------------------------------------------- || Output | Format (ESM/CJS/IIFE/UMD), directory, target, platform | [options-output](references/options-output.md) || Declaration Files | .d.ts generation, isolatedDeclarations, sourcemaps | [options-dts](references/options-dts.md) || Dependencies | External, noExternal, dependency bundling | [options-dependencies](references/options-dependencies.md) || Package Exports | Auto-generating exports, main, module fields | [options-package-exports](references/options-package-exports.md) |## Features| Topic | Description | Reference || ------------- | -------------------------------------- | ------------------------------------------------------------ || Optimization | Tree shaking, minification, sourcemaps | [features-optimization](references/features-optimization.md) || Shims | CJS/ESM compatibility shims | [features-shims](references/features-shims.md) || Unbundle Mode | Bundleless transpile-only builds | [features-unbundle](references/features-unbundle.md) || Watch Mode | Auto-rebuild on file changes | [features-watch](references/features-watch.md) |## Advanced| Topic | Description | Reference || ---------------- | ------------------------------------------ | -------------------------------------------------------------------- || Plugins | Rolldown, Unplugin, Rollup, Vite plugins | [advanced-plugins](references/advanced-plugins.md) || Hooks | Build lifecycle hooks | [advanced-hooks](references/advanced-hooks.md) || Programmatic API | Using tsdown from code | [advanced-programmatic](references/advanced-programmatic.md) || Rolldown Options | Customizing inputOptions and outputOptions | [advanced-rolldown-options](references/advanced-rolldown-options.md) |## Recipes| Topic | Description | Reference || ----------------- | ------------------------------ | ------------------------------------------------------ || Framework Support | Vue and React library bundling | [recipes-frameworks](references/recipes-frameworks.md) || Migration | Migrating from tsup | [recipes-migration](references/recipes-migration.md) |---> Converted and distributed by [TomeVault](https://tomevault.io/claim/sanity-io) — claim your Tome and manage your conversions.

Frequently asked questions

Tsdown