tsdown Rolldown + Oxc powered TypeScript bundler. Drop-in tsup replacement. When to Use Building TypeScript libraries Generating .d.ts declarations Publishing npm packages Dual ESM/CJS output Vue/React component libraries Quick Start npm i -D tsdown typescript // tsdown.config.ts import { defineConfig } from 'tsdown' export default defineConfig ( { entry : 'src/index.ts' , format : 'esm' , dts : true , exports : true , } ) tsdown

Build

tsdown --watch

Watch mode

Reference Files Task File Config file, CLI, entry points config.md Format, target, dts, exports, validation output.md Shims, unbundle, watch, frameworks, WASM features.md Plugins, hooks, lint, programmatic, migration advanced.md Loading Files Consider loading these reference files based on your task: references/config.md - if setting up tsdown.config.ts, CLI, or entry points references/output.md - if configuring output format, target, .d.ts, exports, or validation references/features.md - if using shims, unbundle, watch mode, framework integrations, or WebAssembly references/advanced.md - if writing plugins, using linting/validation, programmatic API, or migrating from tsup DO NOT load all files at once. Load only what's relevant to your current task. Cross-Skill References Library patterns → Use ts-library skill Vue component libs → Use vue skill Package management → Use pnpm skill