Wyjaśnij problem z powyższym kodem komponentu Angular i jak go naprawić: ```typescript @Component({ selector: 'app-user', template: './user.component.html', stylesUrls: './user.component.scs', changeDetection: ChangeDetectionStrategy.OnPush, }) export class CmfUserComponent { users$: any; constructor() { const api = new BackendService(); this.users$ = api.getUsers(); } } ```