Basic Leaflet Isochrones

Display Targomo polygons on a leaflet map 
<!DOCTYPE html>
<html>

<head>
    <!--  Include leaflet javascript and css -->
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css">
    <script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet-src.js" crossorigin="" type="text/javascript"></script>

    <!--  Include targomo leaflet full build -->
    <script src="https://releases.targomo.com/leaflet/latest-full.min.js"></script>
    <style>
        body,
        html {
            margin: 0;
            width: 100%;
            height: 100%;
        }

        #map {
            width: 100%;
            height: 100%;
        }
    </style>
</head>

<body>
    <!--  where the map will live  -->
    <div id="map"></div>
    <script>
        async function initMap() {
            // create targomo client
            const client = new tgm.TargomoClient('britishisles', '__targomo_key_here__');
            // define the basemap
            const tileLayer = new tgm.leaflet.TgmLeafletTileLayer(client, 'Light');
            // Coordinates to center the map
            const center = [55.949905, -3.199814];
        
            // define the map
            var map = L.map('map', {
                layers: [tileLayer],
                scrollWheelZoom: false
            }).setView(center, 11);
        
            // set the attribution
            const attributionText = '<a href="https://www.targomo.com/developers/resources/attribution/" target="_blank">&copy; Targomo</a>';
            map.attributionControl.addAttribution(attributionText);
        
            // polygons time rings
            const travelTimes = [300, 600, 900, 1200, 1500, 1800];
        
            // polygon service options
            const options = {
                travelType: 'bike',
                travelEdgeWeights: travelTimes,
                maxEdgeWeight: 1800,
                edgeWeight: 'time',
                serializer: 'json'
            };
        
            // define the starting point
            const sources = [{ id: 0, lat: center[0], lng: center[1] }];
        
            // Add markers for the sources on the map.
            sources.forEach(source => {
                L.marker([source.lat, source.lng]).addTo(map)
            });
        
            // define the polygon overlay
            const polygonOverlayLayer = new tgm.leaflet.TgmLeafletPolygonOverlay({ strokeWidth: 20 });
            polygonOverlayLayer.addTo(map);
        
            // get the polygons
            const polygons = await client.polygons.fetch(sources, options);
            // calculate bounding box for polygons
            const bounds = polygons.getMaxBounds();
            // add polygons to overlay
            polygonOverlayLayer.setData(polygons);
            // zoom to the polygon bounds
            map.fitBounds(new L.latLngBounds(bounds.northEast, bounds.southWest));
        }
        
        initMap();
    </script>
</body>

</html>
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