declare module 'react-navigation-redux-helpers' {
  import {
    NavigationContainer,
    NavigationEventCallback,
    NavigationEventSubscription,
    NavigationState,
    NavigationDispatch,
    NavigationScreenProp
  } from '@react-navigation/core';
  import * as React from 'react';
  import { Middleware, Reducer } from 'redux';

  export type Navigator = NavigationContainer;

  export type ReducerState = NavigationState | null | undefined;

  export function createReactNavigationReduxMiddleware<S>(
    navStateSelector: (state: S) => NavigationState,
    key?: string,
  ): Middleware;

  export function createNavigationReducer(navigator: Navigator): Reducer<ReducerState>;

  export function createReduxContainer<S, P>(
    navigator: Navigator,
    key?: string,
  ): React.ComponentType<{ state: NavigationState; dispatch: NavigationDispatch } & P>;
}