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@Component({
  selector: 'my-app',
  template: `
    <alert></alert>
    <alert type="danger"></alert>
    <alert type="info"></alert>
  `,
})
export class App {
  @ViewChildren(AlertComponent) alerts: QueryList<AlertComponent>
  
  ngAfterViewInit() {
    this.alerts.forEach(alertInstance => console.log(alertInstance));
  }
}