Streamable

declare class Class<A, E = never, R = never> implements Stream<A, E, R> {
  constructor<A, E = never, R = never>();
  readonly [StreamTypeId]: {
    _A: (_: never) => never;
    _E: (_: never) => never;
    _R: (_: never) => never;
  };
  pipe(): unknown;
  abstract toStream(): Stream<A, E, R>;
}