awesome composite by typescript and redux

store.ts

import { createStore, combineReducers, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk';
import { request } from './utils/utils';

import accountlist from './containers/AccountList/reducer';
import withdraworder from './containers/WithdrawOrder/reducer';

const userInitialState = {
}

const userReducer = (state = userInitialState) => state;

const reducer = {
  accountlist,
  withdraworder,
  userinfo: userReducer,
};

type GetReturnType<original extends Function> = 
  original extends (...x: any[]) => infer returnType ? returnType : never

export type IFnReturnType<T> = {
  [P in keyof T]: T[P] extends Function ? GetReturnType<T[P]> : T[P];
};

export type IRootStateType = IFnReturnType<typeof reducer>;

const composeEnhancers = (window as any).__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const combinedReducer = combineReducers(reducer);

const store = createStore(
  combinedReducer,
  composeEnhancers(
    applyMiddleware(
      thunk.withExtraArgument({ request: request() })
    )
  )
);

export default store;