text: /* */ 
  "use strict";
  var __extends = (this && this.__extends) || function(d, b) {
    for (var p in b)
      if (b.hasOwnProperty(p))
        d[p] = b[p];
    function __() {
      this.constructor = d;
    }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
  };
  var OuterSubscriber_1 = require('../OuterSubscriber');
  var subscribeToResult_1 = require('../util/subscribeToResult');
  function switchMapTo(innerObservable, resultSelector) {
    return this.lift(new SwitchMapToOperator(innerObservable, resultSelector));
  }
  exports.switchMapTo = switchMapTo;
  var SwitchMapToOperator = (function() {
    function SwitchMapToOperator(observable, resultSelector) {
      this.observable = observable;
      this.resultSelector = resultSelector;
    }
    SwitchMapToOperator.prototype.call = function(subscriber, source) {
      return source._subscribe(new SwitchMapToSubscriber(subscriber, this.observable, this.resultSelector));
    };
    return SwitchMapToOperator;
  }());
  var SwitchMapToSubscriber = (function(_super) {
    __extends(SwitchMapToSubscriber, _super);
    function SwitchMapToSubscriber(destination, inner, resultSelector) {
      _super.call(this, destination);
      this.inner = inner;
      this.resultSelector = resultSelector;
      this.index = 0;
    }
    SwitchMapToSubscriber.prototype._next = function(value) {
      var innerSubscription = this.innerSubscription;
      if (innerSubscription) {
        innerSubscription.unsubscribe();
      }
      this.add(this.innerSubscription = subscribeToResult_1.subscribeToResult(this, this.inner, value, this.index++));
    };
    SwitchMapToSubscriber.prototype._complete = function() {
      var innerSubscription = this.innerSubscription;
      if (!innerSubscription || innerSubscription.isUnsubscribed) {
        _super.prototype._complete.call(this);
      }
    };
    SwitchMapToSubscriber.prototype._unsubscribe = function() {
      this.innerSubscription = null;
    };
    SwitchMapToSubscriber.prototype.notifyComplete = function(innerSub) {
      this.remove(innerSub);
      this.innerSubscription = null;
      if (this.isStopped) {
        _super.prototype._complete.call(this);
      }
    };
    SwitchMapToSubscriber.prototype.notifyNext = function(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
      var _a = this,
          resultSelector = _a.resultSelector,
          destination = _a.destination;
      if (resultSelector) {
        this.tryResultSelector(outerValue, innerValue, outerIndex, innerIndex);
      } else {
        destination.next(innerValue);
      }
    };
    SwitchMapToSubscriber.prototype.tryResultSelector = function(outerValue, innerValue, outerIndex, innerIndex) {
      var _a = this,
          resultSelector = _a.resultSelector,
          destination = _a.destination;
      var result;
      try {
        result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
      } catch (err) {
        destination.error(err);
        return;
      }
      destination.next(result);
    };
    return SwitchMapToSubscriber;
  }(OuterSubscriber_1.OuterSubscriber));
  