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https://github.com/googlemaps-samples/js-api-samples/blob/main/samples/advanced-markers-html/index.ts#L22
const AdvancedMarkerElement = new google.maps.marker.AdvancedMarkerElement(...)
normally one would use a lowercase var name here for an instance, like
const advancedMarkerElement = new google.maps.marker.AdvancedMarkerElement(...)