code: function getReferenceIndexedByCSS(ref) {
      var newRef = {};
      for (var symb in ref.symbolizers) {
          for (var property in ref.symbolizers[symb]) {
              newRef[ref.symbolizers[symb][property].css] = ref.symbolizers[symb][property];
          }
      }
      return newRef;
  }
docs: getReferenceIndexedByCSS returns a reference based on ref indexed by the CSS property name instead of the reference original property name it does a shallow copy of each property, therefore, it's possible to change the returned reference by changing the original one, don't do it