onLoad() {
    this.addSources();
    super.onLoad();
    this.updateClusterSource();
  }
/**
   * On Mapbox map load callback function. Add style sources then style layers.
   * @override
   */
On Mapbox map load callback function. Add style sources then style layers.
@override
On Mapbox map load callback function . Add style sources then style layers . @override
onLoad() {
    this.addSources();
    super.onLoad();
    this.updateClusterSource();
  }
onLoad ( ) { this . addSources ( ) ; super . onLoad ( ) ; this . updateClusterSource ( ) ; }
On Mapbox map load callback function.
On Mapbox map load callback function .