What is the proper use of an EventEmitter?

Question

I\'ve read questions like Access EventEmitter Service inside of CustomHttp where the user uses EventEmitter in his service, but he was suggested in this comment not to use

Answer 1

When you want to have cross component interaction, then you need to know what are @Input , @Output , EventEmitter and Subjects.

If the relation between components is parent- child or vice versa we use @input & @output with event emitter..

@output emits an event and you need to emit using event emitter.

If it's not parent child relationship.. then you have to use subjects or through a common service.