.js

import { createStore, applyMiddleware, compose } from 'redux';
import createReducer from './reducers';

const composeEnhancers =
  typeof window === 'object' &&
  (window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
    ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
    : compose);

export function configureStore() {
  const middlewares = [];
  const store = createStore(
    createReducer(),
    {},
    composeEnhancers(applyMiddleware(...middlewares))
  );
  return store;
}

export default configureStore;