Use ko.subscribable in place of js-signals when using crossroads.js

ko-signals.js

(function(factory, global) {
  if (global.define && global.define.amd) {
    global.define(['ko'], factory);
  } else {
    global.signals = factory(global.ko);
  }
})(function(ko) {
  return {
    Signal: function() {
      var sub = new ko.subscribable();

      this.add = sub.subscribe.bind(sub);
      this.getNumListeners = sub.getSubscriptionsCount.bind(sub);

      this.dispatch = function() {
        var args = arguments;
        if (sub._subscriptions.change) {
          sub._subscriptions.change.slice(0).forEach(function (subscription) {
            // In case a subscription was disposed during the arrayForEach cycle, check
            // for isDisposed on each subscription before invoking its callback
            if (subscription && (subscription.isDisposed !== true))
                subscription.callback.apply(subscription, args);
          });
        }
      };

      this.removeAll = this.dispose = function() {
        var changeSubs = sub._subscriptions.change || [];
        changeSubs.forEach(function(subscription) {
          subscription.dispose();
        });
        sub._subscriptions.change = [];
      };

      this.addOnce = function(callback) {
        var subscription = sub.subscribe(function() {
          callback.apply(sub, arguments);
          subscription.dispose();
        });
      };
    }
  };
}, this);