import type { Node, Parent } from 'unist';
export type WalkLanguages = 'markdown' | 'html';
/**
 * Fire callback on node and all children of node recursively.
 *
 * @param node The starting node
 * @param callback The callback to handle the node. If this returns something truthy, then the
 *   walking is immediately aborted.
 * @returns True is walking was aborted early due to the callback returning true for a node, false
 *   if it was not aborted.
 */
export declare function walk(node: Node | Parent, language: WalkLanguages, callback: (node: Node, language: WalkLanguages) => unknown): boolean;