How to use the @hpcc-js/other.Legend function in @hpcc-js/other

["English", 7],
                                        ["Spanish", 2],
                                        ["Physics", 4],
                                        ["Astrology", 6]
                                    ])
                                    .label("Label:  ")
                                    .valueColumn("Col Value")
                                    .textColumn("Col Label")
                                );
                                break;
                            case Legend:
                                const line = new Line()
                                    .columns(data.ND.ampolar.columns)
                                    .data(data.ND.ampolar.data)
                                    ;
                                const legend = new Legend()
                                    .targetWidget(line)
                                    ;
                                render(new Border()
                                    .setContent("center", line)
                                    .setContent("right", legend)
                                );
                                break;
                            default:
                                it.skip("Missing Test", () => {
                                    expect(false).to.be.true;
                                });
                        }
                    }
                });
            }