I have a tickets data with some information and also latitude and longitude for each ticket, so I want to show all tickets on map like markers with the help of latitude and longitude, but the thing is some tickets are having same latitude and longitude values, and I tried to implement Marker Clustering by using this link reference, after implementation its throwing some error in console

Type Error: markerclusterer_1.MarkerClusterer is not a constructor.

For reference I am adding the stack blitz URL :- https://stackblitz.com/edit/angular-draw-polygon-google-maps-gwxjlo

I am not getting how to resolve this issue.

Please help me on this problem.

Thanks in advance