import type { Element, Root } from 'hast';
import type { Plugin } from 'unified';
/**
 * Generate `id`s for headings and applies to headings with `id`s.
 * same as rehype-slug + rehype-autolink-headings, but support custom id.
 */
export declare const rehypeHeaderAnchor: Plugin<[], Root>;
export declare const collectHeaderText: (node: Element) => string[];