Method getOpacity

src/google-maps/map-marker/map-marker.ts:414–417

* See * developers.google.com/maps/documentation/javascript/reference/marker#Marker.getOpacity

()

   * developers.google.com/maps/documentation/javascript/reference/marker#Marker.getOpacity
   */
  getOpacity(): number | null {
    this._assertInitialized();
    return this.marker.getOpacity() || null;
  }

  /**
   * See