import type { TreeNodeData } from '../Tree';
import type { TreeExpandedState } from '../use-tree';
export type FlatTreeLineState = 'continuing' | 'closing' | 'none';
export interface FlattenedTreeNodeData {
    /** Node data from tree data */
    node: TreeNodeData;
    /** Nesting level of the node, starts at 1 */
    level: number;
    /** Value of the parent node, `null` for root nodes */
    parent: string | null;
    /** Whether the node has children */
    hasChildren: boolean;
    /** Whether the node is expanded */
    expanded: boolean;
    /** For each level from 2 to this node's `level`, indicates whether a connector
     * line should be drawn at that column for this row:
     * - `'continuing'`: full vertical line passes through this row
     * - `'closing'`: line ends at this row (truncated to the connector level)
     * - `'none'`: no line at this column for this row
     *
     * Index 0 corresponds to level 2, index 1 to level 3, etc.
     * Empty for level-1 (root) nodes. */
    linesPath: FlatTreeLineState[];
}
export declare function flattenTreeData(data: TreeNodeData[], expandedState: TreeExpandedState): FlattenedTreeNodeData[];