index.js

import React from 'react';
import ReactDOM from 'react-dom';
import { createStore, applyMiddleware, compose } from 'redux'
import { Provider } from 'react-redux'
import { BrowserRouter as Router } from 'react-router-dom'
import thunk from 'redux-thunk'
import logger from 'redux-logger'
import rootReducers from './store'
import App from './App'


const reduxDevToolOptions = process.env.REACT_APP_BUILD_ENV === 'production' ? {} : {trace: true, traceLimit: 25}

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ &&
    window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__(reduxDevToolOptions) || compose;

const store = createStore(
    rootReducers,
    composeEnhancers(
        applyMiddleware(thunk, logger)
    )
)

ReactDOM.render(
    <Provider store={store}>
        <Router>
            <App/>
        </Router>
    </Provider>,
    document.getElementById('root'));