Leaflet Inverse Isochrones

Display inverse isochrones on a leaflet map 
<!DOCTYPE html>
<html>
<head>
    <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>
    <script src="https://releases.targomo.com/leaflet/latest-full.min.js"></script>
    <script src="../_shared/tgm-utils.js"></script>

    <style>
        body, html {
            margin: 0;
            width: 100%;
            height: 100%;
        }
        #map {
            width: 100%;
            height: 100%;
        }
        
    </style>
</head>
<body>
    
    <div id="map"></div>
    <script>async function initMap() {
            // Coordinates to center the map (Edinburgh, Scotland)
            const center = [55.949905, -3.199814];
        
            // Initialize map with TgmExampleUtils
            const { client, map } = TgmExampleUtils.initLeafletMap({
                apiKey: '__targomo_key_here__',
                region: 'britishisles',
                center: center,
                zoom: 11
            });
        
            // you need to define some options for the polygon service
            const options = {
                travelType: 'bike',
                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 using TgmExampleUtils
            sources.forEach(source => {
                TgmExampleUtils.createMarker([source.lat, source.lng], map);
            });
        
            // define the polygon overlay
            const polygonOverlayLayer = new tgm.leaflet.TgmLeafletPolygonOverlay({
                strokeWidth: 20,
                inverse: true
            });
            polygonOverlayLayer.addTo(map);
        
            // get the polygons and fit bounds using TgmExampleUtils
            await TgmExampleUtils.fetchAndFitPolygons(client, sources, options, map, polygonOverlayLayer);
        }
        
        initMap();</script>
</body>
</html>
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