unsubscribe--analytics.directive.ts

private registeredEventsSubscription: Subscription;

ngOnChanges({ events }: SimpleChanges) {
  if (events) {
    this.unsubscribeRegisteredEvents();
    this.registeredEventsSubscription = this.registerEvents(this.events)
      .pipe(untilDestroyed(this))
      .subscribe(event => this.logEvent(event, this.properties));
  }
}

unsubscribeRegisteredEvents() {
  if (this.registeredEventsSubscription) {
    this.registeredEventsSubscription.unsubscribe();  
  }
}