Angular google map close info window on new marker click

You can rewrite your clickedMarker very simple as follows

previous;
...
clickedMarker(infowindow) {
    if (this.previous) {
      this.previous.close();
    }
    this.previous = infowindow;
  }

Make the change to your event binding function in the template

(markerClick)="clickedMarker(infoWindow)"

The live code is here

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