Adding Redux to Gatsby - with devtools and redux-thunk

gatsby-browser.js

import React from 'react';
import { Router } from 'react-router-dom';
import { Provider } from 'react-redux';
import { applyMiddleware, compose, createStore } from 'redux';
import thunk from 'redux-thunk';
import rootReducer from './src/reducers';

const loadDevTools = () =>
  process.env.NODE_ENV === 'development' && window.devToolsExtension
    ? window.__REDUX_DEVTOOLS_EXTENSION__ &&
      window.__REDUX_DEVTOOLS_EXTENSION__()
    : f => f;

const store = createStore(
  rootReducer,
  compose(applyMiddleware(thunk), loadDevTools())
);

exports.replaceRouterComponent = ({ history }) => {
  const ConnectedRouterWrapper = ({ children }) => (
    <Provider store={store}>
      <Router history={history}>{children}</Router>
    </Provider>
  );

  return ConnectedRouterWrapper;
};