observable-host-listener-2.ts

@ObservableHostListener<MouseEvent, Coordinate>(
  'window:click',
  ['$event'],
  pipe(
    map(({ clientX, clientY }) => {
      return { x: clientX, y: clientY };
    })
  )
)
coordinateStream$: Observable<Coordinate>;

interface Coordinate {
  x: number;
  y: number;
}