import { Root } from 'mdast';
import { Plugin } from 'unified';
/**
 * A regular expression to detect a YouTube url and parse out the video id as the sixth capture group
 *
 * @example
 * function getVideoId(value: string) {
 *   const match = value.match(YOUTUBE_URL_REGEX);
 *   return !!match ? match[6] : null;
 * }
 */
export declare const YOUTUBE_URL_REGEX: RegExp;
/**
 * A remark plugin to enrich an mdast node tree by converting paragraph nodes containing only a YouTube url into YouTube nodes
 */
export declare const remarkYoutube: Plugin<[], string, Root>;
/**
 * A remark plugin to simplify an mdast node tree by converting YouTube nodes back to paragraph nodes
 */
export declare function youtubeRemark(this: any): typeof convertToYoutubeParagraphs;
declare function convertToYoutubeParagraphs(tree: any): void;
export {};