Maps

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    const basemapId = "arcgis/outdoor";

    const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`;

    olms.apply(map, basemapURL)

      .then(() => {
        // Add Esri attribution
        // Learn more in https://esriurl.com/attribution
        const source = map.getLayers().item(0).getSource();
        const poweredByEsriString = "Powered by <a href='https://www.esri.com/en-us/home' target='_blank'>Esri</a> | ";

        const attributionFn = source.getAttributions();
        if (attributionFn) {
          source.setAttributions((ViewStateLayerStateExtent) => {
            return [poweredByEsriString, ...attributionFn(ViewStateLayerStateExtent)];
          });
        } else source.setAttributions(poweredByEsriString);

      });

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    async function createBasemapSession() {
      return await arcgisRest.BasemapStyleSession.start({
        authentication: accessToken,
        styleFamily: "arcgis",
        duration: 43200, // 12 hours in seconds
        autoRefresh: false
      });
    }

    const basemapStyle = "arcgis/outdoor";
    let map;

    async function loadMap(sessionToken) {
      map = new ol.Map({
        target: "map",
        view: new ol.View({
          center: ol.proj.fromLonLat([-20, 30]),
          zoom: 3
        })
      });

      const styleURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapStyle}?token=${sessionToken}`;

      olms.apply(map, styleURL).then(() => {
        // Add Esri attribution
        // Learn more in https://esriurl.com/attribution
        const source = map.getLayers().item(0).getSource();
        const poweredByEsriString = "Powered by <a href='https://www.esri.com/en-us/home' target='_blank'>Esri</a> | ";

        const attributionFn = source.getAttributions();
        if (attributionFn) {
          source.setAttributions((ViewStateLayerStateExtent) => {
            return [poweredByEsriString, ...attributionFn(ViewStateLayerStateExtent)];
          });
        } else source.setAttributions(poweredByEsriString);
      });
    }

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      const basemapId = "arcgis/navigation";

      const basemapURL = "https://static-map-tiles-api.arcgis.com/arcgis/rest/services/static-basemap-tiles-service/v1";

      const tileLayer = new ol.layer.Tile({
        source: new ol.source.XYZ({
          url: `${basemapURL}/${basemapId}/static/tile/{z}/{y}/{x}?token=${accessToken}`, // Default basemap
          tileSize: 512
        })
      });