title: EventEmitter in angular services, good or bad?
body: <p>I was using <code>EventEmitter</code> and <code>@Output</code> in Angular services, today one of the colleagues mentioned it's not a good practice.</p>
  <p>I found this <a href="https://stackoverflow.com/a/36076701/2279488">post</a> mentioning it's a bad practice and it seems mostly is personal opinion, and this <a href="https://stackoverflow.com/a/47167133/2279488">answer</a> is mentioning it's OK to use it.
  I couldn't find any official document about it, so if somebody knows an official answer for it please post.</p>
  <p>Official doc about <a href="https://angular.io/api/core/EventEmitter" rel="nofollow noreferrer">EventEmittter</a></p>