Events is a great technique to loose code coupling. JS Custom Events was a big step to help the front-end developers write better JS.
Despite this there are many cases where you don’t have your app objects represented in the DOM tree. And do you always have to trigger this event to the DOM when you don’t actually want this to be DOM related.
In the class option you can use the events both from an instance or from the class itself.
Go and check it on https://github.com/ninio/eventy.js