Bundle TypeScript/JavaScript libraries into ESM, CJS, IIFE, and UMD formats.
npx skills add https://github.com/ehyland/skills --skill tsdown
Please help me install this Agent Skill. Skill: tsdown Source: https://github.com/ehyland/skills/tree/main/skills/tsdown Command: npx skills add https://github.com/ehyland/skills --skill tsdown
tsdown simplifies and speeds up bundling for TypeScript/JavaScript libraries by providing a Rolldown-powered workflow that handles multi-format outputs, automated declarations, and monorepo support in a single config.
.d.ts files for TypeScript libraries.To get started, install tsdown and create a tsdown.config.ts exporting defineConfig with your entry and formats.
High-intent search queries and answers about installing and using this skill.
Bundling TypeScript libraries for multiple formats involves using a build tool that handles ESM, CJS, IIFE, and UMD outputs from a single source. tsdown automates this multi-format bundling via Rolldown with a simple config, letting you specify entry points and desired output formats without manual format conversion.
Type declarations can be auto-generated during bundling by configuring DTS output in your build setup. tsdown includes built-in DTS generation, so TypeScript libraries produce `.d.ts` files alongside bundled outputs automatically through the defineConfig API.
Rolldown is a fast Rust-based bundler optimized for speed. tsdown wraps Rolldown with pre-configured bundling workflows for libraries, eliminating setup complexity and delivering faster build times compared to traditional JavaScript bundlers.
Monorepo and workspace bundling requires a tool supporting multiple entry points and shared config patterns. tsdown provides workspace-level configuration that builds multiple packages using a single defineConfig pattern, simplifying monorepo library workflows.
tsdown is designed for easy migration from tsup, offering compatible configuration patterns while leveraging Rolldown's performance improvements. It maintains API familiarity while delivering faster builds for TypeScript library bundling.
Plugin hooks enable custom build logic beyond standard bundling. tsdown's defineConfig API exposes plugin hooks for extending bundling behavior, letting you integrate custom transformations and workflows into the build process.
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