code: function loadGraphSONSync(graph, filename) {
          var FileInputStream = Tinkerpop.autoImport('FileInputStream');
          var stream = new FileInputStream(filename);
          var builder = Tinkerpop.GraphSONReader.build();
          var mapper = _newGraphSONMapperSync();
          builder.mapper(mapper);
          var reader = builder.create();
          reader.readGraph(stream, graph);
          return graph;
      }
docs: ### `loadGraphSONSync(graph: Java.Graph, filename: string)` Loads the graph as GraphSON, and returns the graph (for fluent API).