Butter‑Base‑Streamer provides an abstract ES6 class that developers extend to create “streamer” plugins for the Butter streaming ecosystem. It defines a standard configuration schema, lifecycle methods (constructor, ready, createStream, destroy) and a Promise‑based API for exposing a seekable readable stream together with file metadata, enabling any source (HTTP, YouTube, torrent, etc.) to be treated uniformly by Butter apps. The package is aimed at plugin authors who want to add support for new protocols to the Butter streaming server/selector.