The library creates and manages per-zoom-level clusters for large amounts of markers. This is a v3 implementation of the v2 MarkerClusterer. For a description and examples of how to use this library, check out the how-to. class MarkerClusterer This class extends google.maps.OverlayView. Constructor Constructor Description MarkerClusterer(map:google.maps.Map, opt_markers:Array.<google.maps.Marker>,