index.js

/* eslint-disable no-underscore-dangle */
import React from 'react';
import ReactDOM from 'react-dom';
import {createStore} from 'redux';
import {Provider} from 'react-redux';
import reducer from './reducers';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

const store = createStore (
  reducer,
  {authenticated: false},
  window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__ ()
);

ReactDOM.render (
  <Provider store={store}><App /></Provider>,
  document.getElementById ('root')
);
// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: http://bit.ly/CRA-PWA
serviceWorker.unregister ();