I'm following the Let’s Build: Cryptocurrency Native Mobile App With React Native + Redux tutorial.

When I create my store in App.js, the app works fine

import { createStore, applyMiddleware, compose } from 'redux';

import devTools from 'remote-redux-devtools';

import React, { Component } from 'react';

import { Platform, View } from 'react-native';

import { Provider } from 'react-redux';

import promise from 'redux-promise';

import thunk from 'redux-thunk';

import logger from 'redux-logger';



import { Header, CryptoContainer } from './src/components';

import rootReducer from './src/reducers';    



const middleware = applyMiddleware(thunk, promise, logger);



const Store = createStore(rootReducer, compose(middleware, devTools({

  name: Platform.OS,

  hostname: 'localhost',

  port: 5678

}), ));



export default class App extends Component {

  render() {

    return (

      <Provider store={Store}>

        <View>

          <Header />

          <CryptoContainer />

        </View>

      </Provider>

    );

  }

}

but when I move the store logic to a new file ./src/Store.js,

import { Platform } from 'react-native';    

import { createStore, applyMiddleware, compose } from 'redux';

import devTools from 'remote-redux-devtools';

import promise from 'redux-promise';

import thunk from 'redux-thunk';

import logger from 'redux-logger';



import rootReducer from './reducers';



const middleware = applyMiddleware(thunk, promise, logger);



const Store = createStore(rootReducer,compose(middleware,devTools({

            name: Platform.OS,

            hostname: 'localhost',

            port: 5678

        }),

    )

);



export default Store;

and use it in App.js like

import React, { Component } from 'react';

import { View } from 'react-native';

import { Provider } from 'react-redux';



import { Header, CryptoContainer } from './src/components';

import { Store } from './src/Store';



export default class App extends Component {

  render() {

    return (

      <Provider store={Store}>

        <View>

          <Header />

          <CryptoContainer />

        </View>

      </Provider>

    );

  }

}

I get

TypeError: undefined is not an object (evaluating 'store.getState')

What's causing my build (expo start) to fail when I import Store.js?