/**
 * Infer file metadata from the description of a document.
 *
 * The result is stored on `file.data.meta.description` (and
 * `file.data.meta.descriptionHast`).
 *
 * ###### Notes
 *
 * The description is inferred through three strategies:
 *
 * 1.  If `options.selector` is set and an element for that found, then the
 *     description is the text of that element
 * 2.  Otherwise, if a comment is found with the text of `options.comment`, then
 *     the description is the text up to that comment
 * 3.  Otherwise, the description is the text up to `options.truncateSize`
 *
 * @param {Readonly<Options> | null | undefined} [options]
 *   Configuration (optional).
 * @returns
 *   Transform.
 */
export default function rehypeInferDescriptionMeta(options?: Readonly<Options> | null | undefined): (tree: Root, file: VFile) => undefined;
export type Element = import('hast').Element;
export type Root = import('hast').Root;
export type VFile = import('vfile').VFile;
/**
 * Configuration.
 */
export type Options = {
    /**
     * String to look for in a comment (default: `'more'`); one of the strategies
     * is to look for this comment, everything before it is the description.
     */
    comment?: string | null | undefined;
    /**
     * CSS selector of nodes to ignore (default: `'h1, script, style, noscript,
     * template'`); used when looking for an excerpt comment or truncating the
     * document.
     */
    ignoreSelector?: string | null | undefined;
    /**
     * Whether to expose `file.data.meta.descriptionHast` (default: `false`);
     * this is not used by `rehype-meta`, but could be useful to other plugins;
     * the value contains the rich HTML elements rather than the plain text
     * content.
     */
    inferDescriptionHast?: boolean | null | undefined;
    /**
     * CSS selector to body of content (optional); useful to exclude other
     * things, such as the head, ads, styles, scripts, and other random stuff, by
     * focussing all strategies in one element.
     */
    mainSelector?: string | null | undefined;
    /**
     * How far to search for the excerpt comment before bailing (default:
     * `2048`); the goal of explicit excerpts is that they are assumed to be
     * somewhat reasonably placed; this option prevents searching giant documents
     * for some comment that probably won’t be found at the end.
     */
    maxExcerptSearchSize?: number | null | undefined;
    /**
     * CSS selector to the description (optional); one of the strategies is to
     * look for a certain element, useful if the description is nicely encoded
     * in one element.
     */
    selector?: string | null | undefined;
    /**
     * Number of characters to truncate to (default: `140`); one of the
     * strategies is to truncate the document to a certain number of characters.
     */
    truncateSize?: number | null | undefined;
};