/**
 * Create an extension for `mdast-util-from-markdown`.
 *
 * @param {Options | null | undefined} [options]
 *   Configuration.
 * @returns {FromMarkdownExtension}
 *   Extension for `mdast-util-from-markdown`.
 */
export function frontmatterFromMarkdown(
  options?: Options | null | undefined
): FromMarkdownExtension
/**
 * Create an extension for `mdast-util-to-markdown`.
 *
 * @param {Options | null | undefined} [options]
 *   Configuration.
 * @returns {ToMarkdownExtension}
 *   Extension for `mdast-util-to-markdown`.
 */
export function frontmatterToMarkdown(
  options?: Options | null | undefined
): ToMarkdownExtension
export type Literal = import('mdast').Literal
export type FromMarkdownExtension = import('mdast-util-from-markdown').Extension
export type CompileContext = import('mdast-util-from-markdown').CompileContext
export type FromMarkdownHandle = import('mdast-util-from-markdown').Handle
export type ToMarkdownExtension = import('mdast-util-to-markdown').Options
export type Options = import('micromark-extension-frontmatter').Options
export type Matter = import('micromark-extension-frontmatter/matters.js').Matter
export type Info = import('micromark-extension-frontmatter/matters.js').Info