L = {
const L = await require('leaflet@1.3.4');
if (!L._css) {
document.head.appendChild(L._css = html`
<link href='${await require.resolve('leaflet@1.3.4/dist/leaflet.css')}' rel=stylesheet>
<link href="${await require.resolve('leaflet.markercluster@1.4.1/dist/MarkerCluster.Default.css')}" rel=stylesheet>
`);
}
await require('leaflet.markercluster@1.4.1').catch(() => L.markerClusterGroup);
await require('leaflet.heat').catch(() => L.heatLayer);
return L;
}