client/src/app/core/confirm/confirm.service.ts


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import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';
import 'rxjs/add/operator/first';

@Injectable()
export class ConfirmService {
  showConfirm = new Subject<{ title, message }>();
  confirmResponse = new Subject<boolean>();

  confirm(message = '', title = '') {
    this.showConfirm.next({ title, message });

    return this.confirmResponse.asObservable().first();
  }
}