text: //import { Es6Ctrl } from 'es6lib.js';
  //export { Es7Ctrl };
  define([
      'lib/es6a'
  ], (Es6aCtrl) => class Es6bCtrl extends Es6aCtrl {
  
      /**
       * @constructor
       * @param $scope
       */
      constructor($scope) {
          super($scope);
          // $scope.es8 = ' overriden in Es6bCtrl constructor!';
      }
  
      /**
       * b benefits from super (a) method
       * @returns {*}
       */
      es6() {
          return super.es6() + ':)';
      }
  
      /**
       * b overrides a
       * @returns {string}
       */
      es7() {
          return 'Es7Ctrl es7b overriden in Es6bCtrl';
      }
  
      // b's es8 is undefined, so super class is inherited
      // es8() {
      //     return 'Es7Ctrl es8b';
      // }
  });
  