text: "use strict";
  
  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } _setPrototypeOf(subClass.prototype, superClass && superClass.prototype); if (superClass) _setPrototypeOf(subClass, superClass); }
  
  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
  
  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
  
  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
  
  function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
  
  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
  
  function set(target, property, value, receiver) { if (typeof Reflect !== "undefined" && Reflect.set) { set = Reflect.set; } else { set = function set(target, property, value, receiver) { var base = _superPropBase(target, property); var desc; if (base) { desc = Object.getOwnPropertyDescriptor(base, property); if (desc.set) { desc.set.call(receiver, value); return true; } else if (!desc.writable) { return false; } } desc = Object.getOwnPropertyDescriptor(receiver, property); if (desc) { if (!desc.writable) { return false; } desc.value = value; Object.defineProperty(receiver, property, desc); } else { _defineProperty(receiver, property, value); } return true; }; } return set(target, property, value, receiver); }
  
  function _set(target, property, value, receiver, isStrict) { var s = set(target, property, value, receiver || target); if (!s && isStrict) { throw new Error('failed to set property'); } return value; }
  
  function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
  
  function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }
  
  function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
  
  function _getPrototypeOf(o) { _getPrototypeOf = Object.getPrototypeOf || function _getPrototypeOf(o) { return o.__proto__; }; return _getPrototypeOf(o); }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  let Base = function Base() {
    _classCallCheck(this, Base);
  };
  
  Object.defineProperty(Base.prototype, 0, {
    value: 0,
    writable: true,
    configurable: true
  });
  Object.defineProperty(Base.prototype, 1, {
    value: 1,
    writable: true,
    configurable: true
  });
  let i = 0;
  const proper = {
    get prop() {
      return i++;
    }
  
  };
  
  let Obj =
  /*#__PURE__*/
  function (_Base) {
    function Obj() {
      _classCallCheck(this, Obj);
  
      return _possibleConstructorReturn(this, _getPrototypeOf(Obj).apply(this, arguments));
    }
  
    _createClass(Obj, [{
      key: "update",
      value: function update() {
        var _proper$prop, _super$proper$prop;
  
        _set(_getPrototypeOf(Obj.prototype), _proper$prop = proper.prop, (_super$proper$prop = +_get(_getPrototypeOf(Obj.prototype), _proper$prop, this)) + 1, this, true), _super$proper$prop;
      }
    }, {
      key: "update2",
      value: function update2() {
        var _i, _super$i;
  
        _set(_getPrototypeOf(Obj.prototype), _i = i, (_super$i = +_get(_getPrototypeOf(Obj.prototype), _i, this)) + 1, this, true), _super$i;
      }
    }]);
  
    _inherits(Obj, _Base);
  
    return Obj;
  }(Base);
  
  const obj = new Obj();
  obj.update();
  expect(i).toBe(1);
  expect(obj[0]).toBe(1);
  expect(obj[1]).toBe(1);
  obj.update2();
  expect(i).toBe(1);
  expect(obj[0]).toBe(1);
  expect(obj[1]).toBe(2);
  