Dynamic Library Import API

<script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
  key: "YOUR_API_KEY_HERE",
  v: "beta",
  // Add other bootstrap parameters as needed, using camel case.
});
</script>

let map;

async function initMap() {
    // Create the map.
    const { Map, InfoWindow } = await google.maps.importLibrary("maps");
    map = new Map(document.getElementById("map"),{
        center: { lat: 37.4239163, lng: -122.0947209 },
        zoom: 14,
        mapId: 'DEMO_MAP_ID',
    });

    // Add an info window.
    const infoWindow = new InfoWindow({
        ariaLabel: "Googleplex",
    });

    // Add a marker.
    const {AdvancedMarkerView} = await google.maps.importLibrary("marker");
    const markerView = new AdvancedMarkerView({
        map,
        position: { lat: 37.4239163, lng: -122.0947209 },
        title: 'Googleplex, Mountain View CA'
    });

    markerView.addListener('click', () => {
        infoWindow.close();
        infoWindow.setContent('<b>Googleplex</b>, Mountain View CA');
        infoWindow.open(markerView.map, markerView);
    });
}

initMap();