I have this statement in my angular 4 component methods
private valueChanges: any;
 ngOnInit() {
    this.valueChanges = this.form.valueChanges.subscribe(console.log);
 }
so just want to know what will be the typing of valueChanges variable currently set any
which one is correct?
- valueChanes: Observable;
- valueChanges: Subject;
- valueChanges: Subscription;
 
    