import {Component, OnDestroy} from '@angular/core'; import { AppComponent } from './app.component'; import { AppMainComponent } from './app.main.component'; import { Subscription } from 'rxjs'; import { MenuItem } from 'primeng/api'; @Component({ selector: 'app-topbar', templateUrl: './app.topbar.component.html' }) export class AppTopBarComponent implements OnDestroy{ subscription: Subscription; items: MenuItem[]; constructor(public app: AppComponent, public appMain: AppMainComponent) {} ngOnDestroy() { if (this.subscription) { this.subscription.unsubscribe(); } } }