Node-core streams for userland 
npm install --save readable-stream
Node-core streams for userland
This package is a mirror of the Streams2 and Streams3 implementations in Node-core, including documentation.
If you want to guarantee a stable streams base, regardless of what version of Node you, or the users of your libraries are using, use readable-stream only and avoid the “stream” module in Node-core, for background see this blogpost.
As of version 2.0.0 readable-stream uses semantic versioning.