BufferStream is a Node.js library that provides a writable/readable stream which automatically buffers incoming data, lets you set flexible or fixed‑size buffers, and emits “split” events whenever specified token strings or buffers are encountered—making it easy to re‑chunk streams (e.g., line‑by‑line) or pipe buffered data. It’s aimed at Node developers who need simple, configurable buffering and token‑based splitting for streams such as HTTP request bodies, child‑process output, or any custom data pipeline.