code: function combineQueryParams (qs1, qs2) {
    var combined = {};
  
    function mergeQueryParams (obj) {
      _.forOwn(obj, function (val, key) {
        combined[key] = val;
      });
    }
  
    mergeQueryParams(qs.parse(qs1 || ''));
    mergeQueryParams(qs.parse(qs2 || ''));
  
    return Object.keys(combined).length === 0 ? undefined : qs.stringify(combined);
  }
docs: /* Internal Functions