RxStream
If all you need is just a stream (RxJS Subject). Very lightweight (1.5Kb gzipped) and tree-shaking friendly.
Installation
Using npm:
$ npm i -g npm$ npm i --save rxstream
Documentation
Example
; let stream$ = ;stream$;stream$next1; // 1stream$next2; // 2
Tree-shaking
To perform better tree-shaking, import what you need from its local module, for example:
;;