JS-marker-cluster is not working, when I apply server side rendering

[DineshChopra]

**
Hi, I apply agm-marker-cluster, code for that is given below, Its working fine for me, but when I try to use it with server side rendering its giving me an error
window['MarkerCluster']

<agm-map
[latitude]="lat"
[longitude]="lng"
[zoom]="zoom"
[streetViewControl]="false"
[zoomControl]="mapExpended"
[zoomControlOptions]="zoomControlOptions"
(centerChange)="onCenterChange($event)">
<agm-marker-cluster [styles]="clusterStyles">
<agm-marker
*ngFor = "let community of communityList; let i = index;"
[latitude]="community.Lat"
[longitude]="community.Lng"
[title] = "community.CommunityName"
[iconUrl]="getIconurl(i)"
(markerClick)="markerClick($event, community, i)">

**

Steps to reproduce and a minimal demo of the problem

_Use https://plnkr.co or similar -- try this template as a starting point: http://plnkr.co/edit/YX7W20?p=preview

What steps should we try in your demo to see the problem?

Not working in server side rendering

Should also work at server side rendering

angular7 & angular-google-maps version: 1.0.0-beta.5

**
If I update cluster-manager.js file then it works fine for me
Use import 'js-marker-clusterer-universal';
instead of import 'js-marker-clusterer';
**

[sebholstein]

duplicate of #1052