---
name: tsdown-ae38de561e5a
description: tsdown is a fast and elegant TypeScript library bundler powered by Rolldown and Oxc
license: MIT
---

# 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

```bash
npm i -D tsdown typescript
```

```ts
// tsdown.config.ts
import { defineConfig } from 'tsdown'

export default defineConfig({
  entry: 'src/index.ts',
  format: 'esm',
  dts: true,
  exports: true,
})
```

```bash
tsdown           # Build
tsdown --watch   # Watch mode
```

## Reference Files

| Task                                    | File                                  |
| --------------------------------------- | ------------------------------------- |
| Config file, CLI, entry points          | [config.md](references/config.md)     |
| Format, target, dts, exports            | [output.md](references/output.md)     |
| Shims, unbundle, watch, frameworks      | [features.md](references/features.md) |
| Plugins, hooks, 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, or exports
- [ ] [references/features.md](references/features.md) - if using shims, unbundle, watch mode, or framework integrations
- [ ] [references/advanced.md](references/advanced.md) - if writing plugins, using 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


---
Source attribution: Kurrawong
Original project: https://github.com/Kurrawong/prez-lite/blob/d1b51f4cfc75142c6eeddd9a90aae9298126e3e6/.claude/skills/tsdown/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: Kurrawong
Original project: https://github.com/Kurrawong/prez-lite/blob/d1b51f4cfc75142c6eeddd9a90aae9298126e3e6/.claude/skills/tsdown/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Product Management
Roles: Frontend Developer, Full-Stack Developer, Product Manager
Specialties: Backend, API, Cross Platform
Tools: Tool not specified
Country applicability: Country not specified
Classification basis: Source category, role and specialization labels
Instruction SHA-256: 1c1701ffd8d040729ea4bb1082453bd4d482f84b073dead770ce972ef77cee34