dojo_app/js/my/widget/utils/search.js

define([
    "dojo/_base/declare",
    "esri/widgets/Search"
  ], function(
    declare,
    Search
  ) {
    return declare( null, {
      constructor: function( view ) {
        var search = new Search({
            view: view
        });
        view.ui.add( search, "top-right" );
      }
    });
  });