How to use the @hpcc-js/graph.Subgraph function in @hpcc-js/graph

createSubgraph(id: string, label: string, data?: VertexData): Subgraph {
        let retVal: Subgraph = this.subgraphMap[id];
        if (!retVal) {
            retVal = new Subgraph()
                // .classed({ subgraph: true })
                // .showIcon(false)
                .columns(["DS"])
                .data([[data]])
                ;
            this.subgraphMap[id] = retVal;
        }
        this.vertices.push(retVal);
        retVal.title(`${label}`);
        retVal.getBBox(true);
        return retVal;
    }

.weight(50)
                                    );
                                }, graph2);

                                graph2.data({ vertices: vertices2, edges: edges2 });
                                render(graph2);
                                break;
                            case Sankey:
                                render(new Sankey()
                                    .columns(dataBreach.columns)
                                    .data(dataBreach.data)
                                    .mappings([new SankeyColumn().column("Covered Entity Type"), new SankeyColumn().column("Type of Breach")])
                                );
                                break;
                            case Subgraph:
                                render(new Subgraph()
                                    .title("Hello and Welcome!")
                                );
                                break;
                            case Vertex:
                                render(new Vertex()
                                    .faChar("\uf007")
                                    .text("Hello and Welcome!")
                                    .annotationIcons([
                                        { faChar: "\uf188", tooltip: "Test A", shape_colorFill: "white", image_colorFill: "red" },
                                        { faChar: "\uf0ad", tooltip: "Test B", shape_colorFill: "green", shape_colorStroke: "green", image_colorFill: "white" },
                                        { faChar: "\uf193", tooltip: "Test C", shape_colorFill: "navy", shape_colorStroke: "navy", image_colorFill: "white" }
                                    ])
                                );
                                break;
                            default:
                                it("Has render test", () => {