ng-reactive-sticky-header#setup.ts

@Component({
  selector: 'app-sticky-header',
  template: `<ng-content></ng-content>`,
  styles: [
    `
      :host {
        position: fixed;
        top: 0;
        width: 100%;
      }
    `
  ],
})
export class StickyHeaderComponent implements AfterViewInit {
  ngAfterViewInit() {
    const scroll$ = fromEvent(window, 'scroll');
  }
}