docs: function (oldInfos, newInfos, transition) {
        _emberMetalRun_loop.default.once(this, this.trigger, 'willTransition', transition);
  
        if (_emberMetalProperty_get.get(this, 'namespace').LOG_TRANSITIONS) {
          _emberMetalLogger.default.log('Preparing to transition from \'' + EmberRouter._routePath(oldInfos) + '\' to \'' + EmberRouter._routePath(newInfos) + '\'');
        }
      }