require([
  "esri/Map",
  "esri/core/watchUtils",
  "esri/Viewpoint",
  "esri/views/MapView"
], function(ArcGISMap, watchUtils, Viewpoint, MapView) {
  
  const { whenFalse } = watchUtils;
  
  const KEY = "JSAPI-VIEW";
  
  const vpString = localStorage.getItem(KEY);
  let vp = {};
  if (vpString) {
    vp = JSON.parse(vpString);
  }

  const map = new ArcGISMap({
    basemap: "streets"
  });
  const view = new MapView({
    container: "viewDiv",
    map: map,
    viewpoint: Viewpoint.fromJSON(vp)
  });
  whenFalse(view, "updating", () => {
    const currPoint = view.viewpoint.toJSON();
    localStorage.setItem(KEY, JSON.stringify(currPoint));
  });
});