The elegant bundler for libraries powered by Rolldown
tsdown is a tool that packages TypeScript libraries into distributable builds using the Rolldown bundler. Library authors use it to bundle code and generate declaration files while supporting plugins from related JavaScript tooling.
Latest release v0.23.5 · 3 Nov 2026
2 files for Codex, OpenCode and Claude Code: tsdown AGENTS.md, tsdown CLAUDE.md — 2,618 tokens loaded in every session.
AGENTS.md A 2,613 tok CLAUDE.md A 5 tok These files are rolldown/tsdown's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.