text: "use strict";
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = function (d, b) {
          extendStatics = Object.setPrototypeOf ||
              ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
              function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
          return extendStatics(d, b);
      }
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  Object.defineProperty(exports, "__esModule", { value: true });
  var Subscriber_1 = require("../Subscriber");
  function defaultIfEmpty(defaultValue) {
      if (defaultValue === void 0) { defaultValue = null; }
      return function (source) { return source.lift(new DefaultIfEmptyOperator(defaultValue)); };
  }
  exports.defaultIfEmpty = defaultIfEmpty;
  var DefaultIfEmptyOperator = (function () {
      function DefaultIfEmptyOperator(defaultValue) {
          this.defaultValue = defaultValue;
      }
      DefaultIfEmptyOperator.prototype.call = function (subscriber, source) {
          return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
      };
      return DefaultIfEmptyOperator;
  }());
  var DefaultIfEmptySubscriber = (function (_super) {
      __extends(DefaultIfEmptySubscriber, _super);
      function DefaultIfEmptySubscriber(destination, defaultValue) {
          var _this = _super.call(this, destination) || this;
          _this.defaultValue = defaultValue;
          _this.isEmpty = true;
          return _this;
      }
      DefaultIfEmptySubscriber.prototype._next = function (value) {
          this.isEmpty = false;
          this.destination.next(value);
      };
      DefaultIfEmptySubscriber.prototype._complete = function () {
          if (this.isEmpty) {
              this.destination.next(this.defaultValue);
          }
          this.destination.complete();
      };
      return DefaultIfEmptySubscriber;
  }(Subscriber_1.Subscriber));
  //# sourceMappingURL=defaultIfEmpty.js.map