import { Component, Input, OnDestroy } from '@angular/core'; import { NbThemeService } from '@nebular/theme'; import { takeWhile } from 'rxjs/operators'; @Component({ selector: 'ngx-traffic-back-card', styleUrls: ['./traffic-back-card.component.scss'], templateUrl: './traffic-back-card.component.html', }) export class TrafficBackCardComponent implements OnDestroy { private alive = true; @Input() trafficBarData: any; currentTheme: string; constructor(private themeService: NbThemeService) { this.themeService.getJsTheme() .pipe(takeWhile(() => this.alive)) .subscribe(theme => { this.currentTheme = theme.name; }); } ngOnDestroy() { this.alive = false; } }