How to use the @jupyterlab/docregistry.DocumentRegistry.defaultFileTypes function in @jupyterlab/docregistry

beforeEach(() => {
    const registry = new DocumentRegistry({ textModelFactory });
    registry.addWidgetFactory(widgetFactory);
    registry.addWidgetFactory(widgetFactoryShared);
    DocumentRegistry.defaultFileTypes.forEach(ft => {
      registry.addFileType(ft);
    });
    manager = new DocumentManager({
      registry,
      manager: services,
      opener: {
        open: (widget: Widget) => {
          // no-op
        }
      }
    });
  });

beforeEach(() => {
    const registry = new DocumentRegistry({ textModelFactory });
    registry.addWidgetFactory(widgetFactory);
    registry.addWidgetFactory(widgetFactoryShared);
    DocumentRegistry.defaultFileTypes.forEach(ft => {
      registry.addFileType(ft);
    });
    manager = new DocumentManager({
      registry,
      manager: services,
      opener: {
        open: (widget: Widget) => {
          // no-op
        }
      }
    });
  });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });

beforeEach(() => {
        DocumentRegistry.defaultFileTypes.forEach(ft => {
          registry.addFileType(ft);
        });
      });