Use when bundling TypeScript libraries - provides tsdown configuration, dual ESM/CJS output, .d.ts generation, package validation, and plugin authoring

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 Reference Files Task File Config file, CLI, entry points [config.md](references/config.md) Format, target, dts, exports, validation [output.md](references/output.md) Shims, unbundle, watch, frameworks, WASM [features.md](references/features.md) Plugins, hooks, lint, programmatic, migration [advanced.md](references/advanced.md) Loading Files Consider loading these reference files based on your task: [ ] [references/config.md](references/config.md) if setting up tsdown.config.ts, CLI, or entry points [ ] [references/output.md](references/output.md) if configuring output format, target, .d.ts, exports, or validation [ ] [references/features.md](references/features.md) if using shims, unbundle, watch mode, framework integrations, or WebAssembly [ ] [references/advanced.md](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