title: Using Ngrx Effects Lifecycle hooks OnInitEffects (seems to emit infinitely)
body: <p>I'm trying to learn a bit about effect lifecycle hooks introduced in Ngrx 7 and I'm not really understanding something that's happening. I've got an Angular app and I have the following in an effects class, however, the init$ observable is emitting values infinitely. I would have expected it to fire once and complete. I am somewhat new to observables as well. The documentation doesn't really help me out as there aren't really many examples. I could add a take(1), but I would like to understand why it continues to emit forever.</p>
  
  <pre><code>@Injectable()
  export class AuthEffects implements OnInitEffects{
  
    constructor(private actions$: Actions) {}
  
    @Effect({dispatch: false})
    login$ = this.actions$.pipe(
      ofType&lt;LoginAction&gt;(AuthActionTypes.LoginAction),
      tap(console.log)
    );
  
    @Effect({dispatch: false})
    logout$ = this.actions$.pipe(
      ofType&lt;LogoutAction&gt;(AuthActionTypes.LogoutAction),
      tap(console.log)
    );
  
    @Effect()
    init$ = this.actions$.pipe(
      ofType&lt;Action&gt;('[Auth] Effects Init'),
      tap(console.log)
    );
  
    ngrxOnInitEffects(): Action {
      console.log('AuthEffects init\'d');
      return { type: '[Auth] Effects Init'};
    }
  }
  </code></pre>