RxJS, Most.js, xstream

Libraries like xstream, RxJS or Most.js, greatly simplify code related to events, asynchrony, and errors.
http://reactivex.io/rxjs/manual/tutorial.html
https://github.com/cujojs/most/
https://github.com/staltz/xstream

Comparing RxJS and xstream: from https://medium.com/@AlbertKlusky/rxjs-be-careful-with-that-axe-eugene-a1763d115e30#.fmw8sa3au

I relay like rxjs. It’s very powerful tools, but at the same time it’s super dangerous. I know that creator of framework Cycle.js — André Staltz — resigned from using Rxjs and switched to xstreams. Main problem which forced him to switch to xstream was confusion around hot and cold observables. I think the same. Rxjs would be much easier without cold observable, if everything would be hot like with xstreams. Cold streams are handy but are super dangerous. Similar like with two way data binding. It’s cool feature, but super dangerous.