Defining NonEmptyArray and NonEmptyReadonlyArray with map method

declare global {
  interface Array<T> {
    map<A, B>(this: NonEmptyArray<A>, map: (a: A, index: number) => B): NonEmptyArray<A>
  }
  interface ReadonlyArray<T> {
    map<A, B>(this: NonEmptyReadonlyArray<A>, map: (a: A, index: number) => B): NonEmptyReadonlyArray<A>
  }
}