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HTML

              
                <html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1, maximum-scale=1,user-scalable=no"
    />

    <title>Map changes depends on property watching - 4.12</title>

    <link
      rel="stylesheet"
      href="https://js.arcgis.com/4.12/esri/themes/light/main.css"
    />
    <script src="https://js.arcgis.com/4.12/"></script>

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }
    </style>

    <script>
      require([
        "esri/Map",
        "esri/views/SceneView",
        "esri/widgets/Expand",      "esri/widgets/BasemapGallery","esri/layers/FeatureLayer"], function(Map, SceneView, Expand, BasemapGallery,FeatureLayer) {
        var map = new Map({
          basemap: "osm"
        });
        
var Layer = new FeatureLayer({
        url: "https://services.arcgis.com/d3voDfTFbHOCRwVR/arcgis/rest/services/REGION_2018/FeatureServer/0",
      });
      map.add(Layer);
        
Layer.renderer = {
type: "simple",
   symbol: {
  type: "simple-fill",  // autocasts as new SimpleFillSymbol()
  color: [ 51,51, 204, 1 ],
  style: "solid",
  outline: {  // autocasts as new SimpleLineSymbol()
    color: "white",
    width:1
  }
   }
};       
        var view = new SceneView({
          container: "viewDiv",
          map: map,
          camera: {
            position: {
              x: 2.35, // lon
              y: 47,   // lat
              z: 3000000 // elevation in meters
            },
          }
        });
        
        var basemapGallery = new BasemapGallery({
          view: view,
        });

        // Create an Expand instance 

        var widgetExpand = new Expand({
          view: view,
          content: basemapGallery
        });
//watch the property map.basemap.title from the view, if it changes, we call the function     
        view.watch("map.basemap.title",function(){
          widgetExpand.collapse(); //close the expand widget
          let varJSON=map.basemap.toJSON();
          if (varJSON.baseMapLayers[0].title=="World Imagery"){

Layer.renderer = {
type: "simple",
   symbol: {
  type: "simple-fill",  // autocasts as new SimpleFillSymbol()
  color: [ 51,51, 204, 0 ],
  style: "solid",
  outline: {  // autocasts as new SimpleLineSymbol()
    color: "white",
    width:1
  }
   }
};         
 }
          
        else{
   Layer.renderer = {
type: "simple",
   symbol: {
  type: "simple-fill",  // autocasts as new SimpleFillSymbol()
  color: [ 51,51, 204, 1 ],
  style: "solid",
  outline: {  // autocasts as new SimpleLineSymbol()
    color: "white",
    width:1
  }
   }
};
 }                                                });
        // Add the expand instance to the ui
        view.ui.add(widgetExpand, "top-right");
      });

    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
  </body>
</html>

              
            
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