разобрался
public markerClusterOptions: L.MarkerClusterGroupOptions = {
iconCreateFunction() {
const icon = L.divIcon({
iconSize: [35, 35],
iconAnchor: [10, 10],
popupAnchor: [10, 0],
shadowSize: [0, 0],
html: '<div>Hello</div>'
});
return icon;
}
};