Const fileUploadStatus
fileUploadStatus: JupyterFrontEndPlugin<void> = {id: '@jupyterlab/filebrowser-extension:file-upload-status',autoStart: true,requires: [IFileBrowserFactory, ITranslator],optional: [IStatusBar],activate: (app: JupyterFrontEnd,browser: IFileBrowserFactory,translator: ITranslator,statusBar: IStatusBar | null) => {if (!statusBar) {// Automatically disable if statusbar missingreturn;}const item = new FileUploadStatus({tracker: browser.tracker,translator});statusBar.registerStatusItem('@jupyterlab/filebrowser-extension:file-upload-status',{item,align: 'middle',isActive: () => {return !!item.model && item.model.items.length > 0;},activeStateChanged: item.model.stateChanged});}}