addOverlayInternal_(overlay) {
    const id = overlay.getId();
    if (id !== undefined) {
      this.overlayIdIndex_[id.toString()] = overlay;
    }
    overlay.setMap(this);
  }
/**
   * This deals with map's overlay collection changes.
   * @param {import("./Overlay.js").default} overlay Overlay.
   * @private
   */
This deals with map's overlay collection changes.
This deals with map ' s overlay collection changes .
addOverlayInternal_(overlay) {
    const id = overlay.getId();
    if (id !== undefined) {
      this.overlayIdIndex_[id.toString()] = overlay;
    }
    overlay.setMap(this);
  }
addOverlayInternal_ ( overlay ) { const id = overlay . getId ( ) ; if ( id !== undefined ) { this . overlayIdIndex_ [ id . toString ( ) ] = overlay ; } overlay . setMap ( this ) ; }
This deals with map's overlay collection changes.
This deals with map ' s overlay collection changes .