examples/html/importmap.html

<!doctype html>
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<html>
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
    />
    <title>Map / Marker example using importmaps</title>
    <style>
      body {
        margin: 0;
      }
      #map {
        width: 100vw;
        height: 100vh;
      }
    </style>

    <!-- Import maps polyfill -->
    <script
      async
      src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"
    ></script>
    <script type="importmap">
      {
        "imports": {
          "@googlemaps/marker": "https://unpkg.com/@googlemaps/adv-markers-utils/dist/index.module.js",
          "@googlemaps/marker/icons": "https://unpkg.com/@googlemaps/adv-markers-utils/dist/icons.module.js",
          "@googlemaps/marker/places": "https://unpkg.com/@googlemaps/adv-markers-utils/dist/places.module.js"
        }
      }
    </script>

    <script>
      // get API key from URL
      const url = new URL(location);
      const GOOGLE_MAPS_API_KEY = url.searchParams.get('apiKey');

      if (!GOOGLE_MAPS_API_KEY) {
        const key = prompt(
          'Please provide your Google Maps API key in the URL\n' +
            '(using the parameter `?apiKey=YOUR_API_KEY_HERE`) or enter it here:'
        );

        if (key) {
          url.searchParams.set('apiKey', key);
          location.replace(url.toString());
        }
      }

      // Google Maps importLibrary loader
      //   see: https://developers.google.com/maps/documentation/javascript/dynamic-loading
      // prettier-ignore
      (g=>{var h,b,k,n="The Google Maps JavaScript API",c="google",l="importLibrary",p="__ib__",q=document,a=window;a=a[c]||(a[c]={});var d=a.maps||(a.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,m)=>{await (b=q.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."+p);b.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[p]=f;b.onerror=()=>h=m(Error(n+" could not load."));q.head.append(b)}));d[l]?console.warn(n+" only loads once. Ignoring:",g):d[l]=(f,...m)=>r.add(f)&&u().then(()=>d[l](f,...m))})
      ({
        key: GOOGLE_MAPS_API_KEY,
        v: "beta"
      });
    </script>
  </head>
  <body>
    <div id="map"></div>

    <script type="module">
      import {Marker} from '@googlemaps/marker';

      async function main() {
        const {Map} = await google.maps.importLibrary('maps');

        await google.maps.importLibrary('marker');

        const map = new Map(document.querySelector('#map'), {
          mapId: 'bf51a910020fa25a',
          center: {lat: 53.555, lng: 10.001},
          zoom: 12
        });

        const marker = new Marker({map, position: {lat: 53.555, lng: 10.001}});
      }
      main();
    </script>
  </body>
</html>