tsdown
tsdown packages your TypeScript and JavaScript code for npm distribution while preserving complete type information. This skill automates the bundling process, ensuring your libraries ship with accurate type declarations for better developer experience and IDE support.
tsdown is a TypeScript library bundler that packages your TypeScript and JavaScript code for npm distribution while preserving complete type information. The skill automates the bundling process, ensuring your libraries ship with accurate type declarations for better developer experience and IDE support.
AI-generated summary based on this skill's SKILL.md
Decision gist · record as of 2026-06-23
tsdown is a TypeScript library bundler that packages your TypeScript and JavaScript code for npm distribution while preserving complete type information. The skill automates the bundling process, ensuring your libraries ship with accurate type declarations for better developer experience and IDE support.
Use it when
- Yes, tsdown specializes in bundling TypeScript and JavaScript libraries for npm with type declarations.
- tsdown can generate multiple output formats (ESM, CJS, IIFE, UMD) from a single source.
Verify before relying
Read SKILL.md below before installing (42 files). Open directory: indexed for reading, not audited.
Install
antfu/skills/tsdown · repository language: TypeScript
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Frequently asked questions
AI-generated answers based on this skill's SKILL.md and metadata
What is tsdown and what does it do for TypeScript libraries?
tsdown is a TypeScript library bundler that packages your TypeScript and JavaScript code for npm distribution while preserving complete type information. The skill automates the bundling process, ensuring your libraries ship with accurate type declarations for better developer experience and IDE support.
Can tsdown bundle TypeScript libraries for npm with type declarations?
Yes, tsdown specializes in bundling TypeScript and JavaScript libraries for npm with type declarations. It handles the complete packaging workflow, automatically generating and including .d.ts type declaration files so your published library provides full type information to consumers.
What output formats does tsdown support for bundled libraries?
tsdown can generate multiple output formats (ESM, CJS, IIFE, UMD) from a single source, allowing you to distribute your library in the formats your users need without maintaining separate build configurations.
Is tsdown a suitable alternative to tsup for faster bundling?
tsdown is designed as a faster bundler option with minimal configuration changes needed when migrating from tsup. It provides comparable functionality while improving build performance, making it an efficient choice for teams looking to speed up their TypeScript library builds.
Can tsdown be used to build React and Vue component libraries?
Yes, tsdown efficiently builds React, Vue, Solid, and Svelte component libraries. It handles the specific requirements of framework component bundling while maintaining type safety and generating the necessary type declarations for component consumers.
How does tsdown optimize bundle size and performance?
tsdown optimizes bundle size through tree shaking, minification, and dependency control features. These capabilities help reduce your final bundle size while ensuring only necessary code is included in your npm distribution.
SKILL.md
Rendered from the published skill. Quoted content, verbatim.
tsdown - The Elegant Library Bundler
Blazing-fast bundler for TypeScript/JavaScript libraries powered by Rolldown and Oxc.
Runtime Requirement
tsdown requires Node.js 22.18.0 or higher to run (build-time only). However, the bundled output can target much lower Node.js versions via the target option, so libraries built with tsdown are not locked to Node.js 22+ at runtime.
If your package needs to support Node.js 18 / 20:
- Build with Node.js 22+ in CI (e.g. set
target: 'node18'ortarget: 'node20'). - Test the built output (or the packed tarball) on the lower Node.js versions you intend to support — e.g. using a matrix job that runs the published package's tests on Node.js 18 / 20 / 22.
When to Use
- Building TypeScript/JavaScript libraries for npm
- Generating TypeScript declaration files (.d.ts)
- Bundling for multiple formats (ESM, CJS, IIFE, UMD)
- Optimizing bundles with tree
(truncated - see the full file via the links below)
File tree — 15 files
skills/tsdown/LICENSE.md
skills/tsdown/README.md
skills/tsdown/SKILL.md
skills/tsdown/SYNC.md
skills/tsdown/references/README.md
skills/tsdown/references/advanced-benchmark.md
skills/tsdown/references/advanced-ci.md
skills/tsdown/references/advanced-hooks.md
skills/tsdown/references/advanced-plugins.md
skills/tsdown/references/advanced-programmatic.md
skills/tsdown/references/advanced-rolldown-options.md
skills/tsdown/references/guide-getting-started.md
skills/tsdown/references/guide-introduction.md
skills/tsdown/references/guide-migrate-from-tsup.md
skills/tsdown/references/option-cjs-default.md
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Related skills
tsdown is a modern bundler built on Rolldown that streamlines packaging TypeScript and JavaScript libraries for distribution. It combines fast build performance with automatic declaration file generation, making it ideal for developers preparing libraries for npm publication.
tsdown is a bundling tool designed to package TypeScript and JavaScript libraries for npm distribution with support for multiple output formats. It simplifies the build process by offering flexible configuration options tailored to modern web development workflows.
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This skill guides you through converting an existing tsup-based build setup to tsdown, Rolldown's elegant library bundler. It provides comprehensive option mappings and automated config transformation to ensure your project transitions smoothly while maintaining build performance and output quality.
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