text: function _classCallCheck(instance, Constructor) {
      if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
  }
  function _getPrototypeOf(o) {
      return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
          return o.__proto__ || Object.getPrototypeOf(o);
      }, _getPrototypeOf(o);
  }
  function _inherits(subClass, superClass) {
      if ("function" != typeof superClass && null !== superClass) throw new TypeError("Super expression must either be null or a function");
      subClass.prototype = Object.create(superClass && superClass.prototype, {
          constructor: {
              value: subClass,
              writable: !0,
              configurable: !0
          }
      }), superClass && _setPrototypeOf(subClass, superClass);
  }
  function _setPrototypeOf(o, p) {
      return _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
          return o.__proto__ = p, o;
      }, _setPrototypeOf(o, p);
  }
  function _createSuper(Derived1) {
      var hasNativeReflectConstruct = function() {
          if ("undefined" == typeof Reflect || !Reflect.construct) return !1;
          if (Reflect.construct.sham) return !1;
          if ("function" == typeof Proxy) return !0;
          try {
              return Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function() {
              })), !0;
          } catch (e) {
              return !1;
          }
      }();
      return function() {
          var obj, self, call, result, Super = _getPrototypeOf(Derived1);
          if (hasNativeReflectConstruct) {
              var NewTarget = _getPrototypeOf(this).constructor;
              result = Reflect.construct(Super, arguments, NewTarget);
          } else result = Super.apply(this, arguments);
          return self = this, (call = result) && ("object" == ((obj = call) && "undefined" != typeof Symbol && obj.constructor === Symbol ? "symbol" : typeof obj) || "function" == typeof call) ? call : (function(self) {
              if (void 0 === self) throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
              return self;
          })(self);
      };
  }
  var Base = function() {
      "use strict";
      _classCallCheck(this, Base);
  }, Derived = function(Base1) {
      "use strict";
      _inherits(Derived, Base1);
      var _super = _createSuper(Derived);
      function Derived() {
          return _classCallCheck(this, Derived), _super.apply(this, arguments);
      }
      return Derived;
  }(Base), Derived2 = function(Base2) {
      "use strict";
      _inherits(Derived2, Base2);
      var _super = _createSuper(Derived2);
      function Derived2() {
          return _classCallCheck(this, Derived2), _super.apply(this, arguments);
      }
      return Derived2;
  }(Base);
  