/**
 * tree-select - pure tree helpers behind <SvTreeSelect>: flatten the visible
 * rows for the current expansion state (so keyboard nav is a flat index), and
 * resolve the path from root to a value (for the trigger label). Framework-free
 * + pure so they are unit-tested directly.
 */
import type { TreeSelectNode } from './ui-app.types';
export type FlatRow = {
    node: TreeSelectNode;
    depth: number;
    hasChildren: boolean;
    expanded: boolean;
};
/** The rows currently visible given the `expanded` set, in display order. */
export declare function flattenVisible(nodes: ReadonlyArray<TreeSelectNode>, expanded: ReadonlySet<string | number>, depth?: number): FlatRow[];
/** Path of nodes from a root down to `value`, or null if not found. */
export declare function findNodePath(nodes: ReadonlyArray<TreeSelectNode>, value: string | number): TreeSelectNode[] | null;
/** Every value that has children (useful for "expand all"). */
export declare function branchValues(nodes: ReadonlyArray<TreeSelectNode>): Array<string | number>;