import type { ESLAnchorData } from './esl-anchornav';
/** {@link ESLAnchornav} hierarchy builder function */
export type ESLAnchornavHierarchyBuilder = (flatAnchors: ESLAnchorData[]) => ESLAnchorData[];
/**
 * Builds hierarchy based on level property from anchor data.
 * Anchors with smaller level values become parents of following anchors with larger values.
 * Uses `data.level` property from the anchor's data object (set via `esl-anchor="level: X"` attribute).
 * @param flatAnchors - flat list of anchors in DOM order
 * @returns hierarchical anchors list (roots only)
 */
export declare function buildHierarchyByLevel(flatAnchors: ESLAnchorData[]): ESLAnchorData[];