import { ChangeDetectionStrategy , Component , Input } from '@angular/core' ; param item @ Component ( { changeDetection : ChangeDetectionStrategy . OnPush , selector : 'product-page-download-item' , styleUrls : [ './download-item.component.scss' ] , templateUrl : './download-item.component.html' } ) export class DownloadItemComponent { @ Input ( ) item : any = null ; param index param item trackByIndex ( index , item ) { return index ; } }