basemap.js

require([
  'esri/map',
  'esri/layers/ArcGISTiledMapServiceLayer'

],
        
function (Map, Tiled) {
  var serviceUrl = 'http://mapserv.utah.gov/arcgis/rest/services/BaseMaps/Terrain/MapServer';
  var map = new Map('map-div');
  
  var tiledService = new Tiled(serviceUrl);
  
  map.addLayer(tiledService);
});