export default class Setup extends Component {

    this.state = {
      isLoading: false,
      store: configureStore(() => this.setState({ isLoading: false })),
      isReady: false
    };

    ...


  render() {
    if (!this.state.isReady || this.state.isLoading) {
      return <Expo.AppLoading />;
    }
    return (
        <Provider store={this.state.store}>
          <App />
        </Provider>
    );
  }
}

import { AsyncStorage } from"react-native";
import devTools from"remote-redux-devtools";
import { createStore, applyMiddleware, compose } from"redux";
import thunk from"redux-thunk";
import { persistStore, persistReducer } from"redux-persist";
import reducer from"../reducers";
import devToolsEnhancer from 'remote-redux-devtools';
import storage from 'redux-persist/lib/storage' // defaults to localStorage for web and AsyncStorage for react-native

const persistConfig = {
  key: 'root',
  storage,
}

const persistedReducer = persistReducer(persistConfig, reducer);

export default function configureStore(onCompletion: () => void): any {
  const enhancer = compose(
    applyMiddleware(thunk),
    devTools({
      name:"MyApp",
      realtime: true
    })
  );

  let store = createStore(persistedReducer, enhancer);
  let persistor = persistStore(store, null, onCompletion);

  return store;
}

import configureStore from"../boot/configureStore";

const state = configureStore
console.log(state);  // returns only the initial value for the store

let store = null;

export function getStore() {
  return store;
}

export default class Setup extends Component {
    constructor(props) {
      super(props);
      store = configureStore(() => this.setState({ isLoading: false })),
      this.state = {
        isLoading: false,
        store,
        isReady: false
      };
}