Google map is not showing on ionic 4

Google map is not showing on ionic 4

 @ViewChild('map') mapElement: ElementRef;
  map: any;
  constructor() {
    let latLng = new google.maps.LatLng(-34.9290, 138.6010);
    let mapOptions = {
      center: latLng,
      zoom: 15,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    } = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

<ion-content padding>

<div #map id=“map”></div>

and I put the API key inside the index.html
please help me out

follow all this steps

This is not an answer, more trouble with IOS. :frowning:

can you provide any console error or something else?

and have you apply fix height CSS to

<div #map id=“map”></div>

height: 300px;

because it is neccessary to apply to div