/**
 * Create an extension for `micromark` to enable MDX expression syntax.
 *
 * @param {Options | null | undefined} [options]
 *   Configuration (optional).
 * @returns {Extension}
 *   Extension for `micromark` that can be passed in `extensions` to enable MDX
 *   expression syntax.
 */
export function mdxExpression(options?: Options | null | undefined): Extension
export type Acorn = import('micromark-util-events-to-acorn').Acorn
export type AcornOptions = import('micromark-util-events-to-acorn').AcornOptions
export type Extension = import('micromark-util-types').Extension
export type State = import('micromark-util-types').State
export type TokenizeContext = import('micromark-util-types').TokenizeContext
export type Tokenizer = import('micromark-util-types').Tokenizer
/**
 * Configuration (optional).
 */
export type Options = {
  /**
   * Acorn parser to use (optional).
   */
  acorn?: Acorn | null | undefined
  /**
   * Configuration for acorn (default: `{ecmaVersion: 2020, locations: true,
   * sourceType: 'module'}`).
   *
   * All fields except `locations` can be set.
   */
  acornOptions?: AcornOptions | null | undefined
  /**
   * Whether to add `estree` fields to tokens with results from acorn.
   */
  addResult?: boolean | null | undefined
  /**
   * Undocumented option to parse only a spread (used by
   * `micromark-extension-mdx-jsx` to parse spread attributes).
   */
  spread?: boolean | null | undefined
  /**
   * Undocumented option to disallow empty attributes (used by
   * `micromark-extension-mdx-jsx` to prohobit empty attribute values).
   */
  allowEmpty?: boolean | null | undefined
}