type AppGroupColumnDef<TFeatures, TData, TCellComponents, THeaderComponents> = Omit<GroupColumnDef<TFeatures, TData, unknown>, "cell" | "header" | "footer" | "columns"> & object;

optional cell: AppColumnDefTemplate<AppCellContext<TFeatures, TData, unknown, TCellComponents>>;

optional columns: ReadonlyArray<ColumnDef<TFeatures, TData, unknown>>;

optional footer: AppColumnDefTemplate<AppHeaderContext<TFeatures, TData, unknown, THeaderComponents>>;

optional header: AppColumnDefTemplate<AppHeaderContext<TFeatures, TData, unknown, THeaderComponents>>;