index.js

import React from "react";
import ReactDOM from "react-dom";
import { createStore, applyMiddleware, compose } from "redux";
import { Provider } from "react-redux";
import thunk from "redux-thunk";
import rootReducer from "./reducers";
import { BrowserRouter as Router } from "react-router-dom";

import App from "./containers/App";
import registerServiceWorker from "./registerServiceWorker";

const boundCompose = compose.bind(null, applyMiddleware(thunk));
const store = createStore(
  rootReducer,
  window.__REDUX_DEVTOOLS_EXTENSION__
    ? boundCompose(window.__REDUX_DEVTOOLS_EXTENSION__())
    : boundCompose()
);

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