How to use the @jupyterlab/ui-components.DockPanelSvg function in @jupyterlab/ui-components

constructor() {
    super();
    this.addClass(APPLICATION_SHELL_CLASS);
    this.id = 'main';

    let headerPanel = (this._headerPanel = new Panel());
    let topHandler = (this._topHandler = new Private.PanelHandler());
    let bottomPanel = (this._bottomPanel = new BoxPanel());
    let hboxPanel = new BoxPanel();
    let dockPanel = (this._dockPanel = new DockPanelSvg({
      kind: 'dockPanelBar'
    }));
    MessageLoop.installMessageHook(dockPanel, this._dockChildHook);

    let hsplitPanel = new SplitPanel();
    let leftHandler = (this._leftHandler = new Private.SideBarHandler());
    let rightHandler = (this._rightHandler = new Private.SideBarHandler());
    let rootLayout = new BoxLayout();

    headerPanel.id = 'jp-header-panel';
    topHandler.panel.id = 'jp-top-panel';
    bottomPanel.id = 'jp-bottom-panel';
    hboxPanel.id = 'jp-main-content-panel';
    dockPanel.id = 'jp-main-dock-panel';
    hsplitPanel.id = 'jp-main-split-panel';