How to use the @theia/workspace/lib/browser.WorkspaceCommands.FILE_COMPARE function in @theia/workspace

commandId: FileSystemCommands.UPLOAD.id,
            order: 'a'
        });
        registry.registerMenuAction(downloadUploadMenu, {
            commandId: FileDownloadCommands.DOWNLOAD.id,
            order: 'b'
        });

        registry.registerMenuAction(NavigatorContextMenu.NAVIGATION, {
            commandId: WorkspaceCommands.NEW_FILE.id
        });
        registry.registerMenuAction(NavigatorContextMenu.NAVIGATION, {
            commandId: WorkspaceCommands.NEW_FOLDER.id
        });
        registry.registerMenuAction(NavigatorContextMenu.COMPARE, {
            commandId: WorkspaceCommands.FILE_COMPARE.id
        });
        registry.registerMenuAction(NavigatorContextMenu.MODIFICATION, {
            commandId: FileNavigatorCommands.COLLAPSE_ALL.id,
            label: 'Collapse All',
            order: 'z2'
        });

        registry.registerMenuAction(NavigatorContextMenu.COMPARE, {
            commandId: NavigatorDiffCommands.COMPARE_FIRST.id,
            order: 'z'
        });
        registry.registerMenuAction(NavigatorContextMenu.COMPARE, {
            commandId: NavigatorDiffCommands.COMPARE_SECOND.id,
            order: 'z'
        });
    }