export type SubRows<RowType, RowIdType> = {
    getSubRows: (row: RowType) => RowType[] | undefined;
    rowKeyGetter: (row: RowType) => RowIdType;
    expandedIdsState?: [
        Set<string | number>,
        (newV: Set<string | number> | ((prev: Set<string | number>) => Set<string | number>)) => void
    ];
    view?: 'tree' | 'merged';
    mergedColumns?: string[];
};