declare module 'espree' {
  import * as estree from 'estree'

  // The version of espree that's loaded, like "v3.4.0".
  export const version: string

  // Parse the given text as javascript into an abstract syntax tree.
  export function parse(text: string, opts?: Options): estree.Program

  // Walk the given text and produce an array of tokens.
  export function tokenize(text: string, opts?: Options): Token[]

  interface Token {
    type: string
    value: string
    start: number
    end: number
  }

  // A map from node type to the properties on that type that contain more nodes.
  export const VisitorKeys: { [kind: string]: string[] }

  const node: estree.Node
  // A map of node types to themselves.
  export const Syntax: { [type: string]: typeof node.type }

  // Options for parsing.
  interface Options {
    // attach range information to each node
    range?: boolean

    // attach line/column location information to each node
    loc?: boolean

    // create a top-level comments array containing all comments
    comment?: boolean

    // attach comments to the closest relevant node as leadingComments and
    // trailingComments
    attachComment?: boolean

    // create a top-level tokens array containing all tokens
    tokens?: true

    // set to 3, 5 (default), 6, 7, or 8 to specify the version of ECMAScript
    // syntax you want to use.
    // You can also set to 2015 (same as 6), 2016 (same as 7), or 2017 (same as 8)
    // to use the year-based naming.
    ecmaVersion?: number

    // specify which type of script you're parsing (script or module, default is script)
    sourceType?: 'script' | 'module'

    // specify additional language features
    ecmaFeatures?: {
      // enable JSX parsing
      jsx?: boolean

      // enable return in global scope
      globalReturn?: boolean

      // enable implied strict mode (if ecmaVersion >= 5)
      impliedStrict?: boolean

      // allow experimental object rest/spread
      experimentalObjectRestSpread?: boolean
    }
  }
}

declare module 'remark-mdx' {
  import * as unified from 'unified'
  const mdx: unified.Attacher
  export = mdx
}