/**
 * @returns {Extension}
 */
export function gfmFootnote(): Extension
export type Extension = import('micromark-util-types').Extension
export type Resolver = import('micromark-util-types').Resolver
export type Token = import('micromark-util-types').Token
export type Tokenizer = import('micromark-util-types').Tokenizer
export type Exiter = import('micromark-util-types').Exiter
export type State = import('micromark-util-types').State
export type Event = import('micromark-util-types').Event