import type { TreeExpandedKeys, TreeNodeData, TreeNodeEntry } from '@primereact/types/headless/tree';
/**
 * Builds `nodeMap` (key → entry for O(1) lookup) and `flatOrder` (DFS keys).
 * Memoized on `value` reference.
 */
export declare function useTreeNodeMap(value: TreeNodeData[] | undefined): {
    nodeMap: Map<string, TreeNodeEntry>;
    flatOrder: string[];
};
/**
 * DFS keys of the rows that are currently visible (ancestors all expanded).
 */
export declare function useTreeVisibleKeys(value: TreeNodeData[] | undefined, expandedKeys: TreeExpandedKeys | undefined): string[];