observable-subscription-example-1.ts

import { SelectionModel } from "@angular/cdk/collections";

@Component(...metaData)
export class AppComponent implements OnInit {
  constructor(peopleSelection: PeopleSelectionService) {}
  ngOnInit(): void {
    this.peopleSelection.selection.changed.subscribe(e => {
      console.log(`I have received a value ${e}`);
    });
  }
}