text: "use strict";
  
  exports.__esModule = true;
  
  var _symbol = require("../core-js/symbol");
  
  var _symbol2 = _interopRequireDefault(_symbol);
  
  var _promise = require("../core-js/promise");
  
  var _promise2 = _interopRequireDefault(_promise);
  
  function _interopRequireDefault(obj) {
    return obj && obj.__esModule ? obj : { default: obj };
  }
  
  exports.default = function () {
    function AwaitValue(value) {
      this.value = value;
    }
  
    function AsyncGenerator(gen) {
      var front, back;
  
      function send(key, arg) {
        return new _promise2.default(function (resolve, reject) {
          var request = {
            key: key,
            arg: arg,
            resolve: resolve,
            reject: reject,
            next: null
          };
  
          if (back) {
            back = back.next = request;
          } else {
            front = back = request;
            resume(key, arg);
          }
        });
      }
  
      function resume(key, arg) {
        try {
          var result = gen[key](arg);
          var value = result.value;
  
          if (value instanceof AwaitValue) {
            _promise2.default.resolve(value.value).then(function (arg) {
              resume("next", arg);
            }, function (arg) {
              resume("throw", arg);
            });
          } else {
            settle(result.done ? "return" : "normal", result.value);
          }
        } catch (err) {
          settle("throw", err);
        }
      }
  
      function settle(type, value) {
        switch (type) {
          case "return":
            front.resolve({
              value: value,
              done: true
            });
            break;
  
          case "throw":
            front.reject(value);
            break;
  
          default:
            front.resolve({
              value: value,
              done: false
            });
            break;
        }
  
        front = front.next;
  
        if (front) {
          resume(front.key, front.arg);
        } else {
          back = null;
        }
      }
  
      this._invoke = send;
  
      if (typeof gen.return !== "function") {
        this.return = undefined;
      }
    }
  
    if (typeof _symbol2.default === "function" && _symbol2.default.asyncIterator) {
      AsyncGenerator.prototype[_symbol2.default.asyncIterator] = function () {
        return this;
      };
    }
  
    AsyncGenerator.prototype.next = function (arg) {
      return this._invoke("next", arg);
    };
  
    AsyncGenerator.prototype.throw = function (arg) {
      return this._invoke("throw", arg);
    };
  
    AsyncGenerator.prototype.return = function (arg) {
      return this._invoke("return", arg);
    };
  
    return {
      wrap: function wrap(fn) {
        return function () {
          return new AsyncGenerator(fn.apply(this, arguments));
        };
      },
      await: function _await(value) {
        return new AwaitValue(value);
      }
    };
  }();