Querying indoor map entity outlines

Query and display the outline polygon of highlightable indoor map entities.
<!DOCTYPE HTML>
<html>
  <head>
    <script src="https://unpkg.com/wrld.js@1.x.x"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.1/leaflet.css" rel="stylesheet" />
  </head>
  
  <body>
  <div style="position: relative">
    <div id="map" style="height: 400px"></div>
    <script>
      var map = Wrld.map("map", "your_api_key_here", {
        center: [56.459801, -2.977928],
        zoom: 18,
        indoorsEnabled: true
      });

      function onInitialStreamingComplete() {
        var mapName = "westport_house";
        map.indoors.enter(mapName);
        Wrld.indoorMapEntities.indoorMapEntityInformation(mapName).addTo(map);
      }

      function onIndoorMapEntered() {
        map.indoors.setFloor(2);
        map.setView([56.459984, -2.978238], 19);
      }

      function onIndoorMapEntityInformationChanged(event) {
        var indoorMapEntityInformation = event.indoorMapEntityInformation;
        var loadState = indoorMapEntityInformation.getLoadState();
        var entities = indoorMapEntityInformation.getIndoorMapEntities();

        if (loadState !== "Complete") return;

        entities.forEach(function(entity) {
          addPolygon(entity, map, indoorMapEntityInformation);
        });
      }

      function addPolygon(entity, map, indoorMapEntityInformation) {
        const polygon = entity.getOutline();
        if (polygon.length === 0) return;
        const indoorMapId = indoorMapEntityInformation.getIndoorMapId();
        const indoorMapFloorId =  entity.getIndoorMapFloorId();
        const polygonOptions = { indoorMapId, indoorMapFloorId, interactive: false };

        Wrld.polygon(polygon, polygonOptions).addTo(map);
      }

      map.on("initialstreamingcomplete", onInitialStreamingComplete);
      map.indoors.on("indoormapenter", onIndoorMapEntered);
      map.indoorMapEntities.on("indoormapentityinformationchanged",onIndoorMapEntityInformationChanged);
    </script>

  </div>
  </body>
</html>