spee.ch/client/client.js

import React from 'react';
import { hydrate } from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware, compose } from 'redux';
import { BrowserRouter } from 'react-router-dom';
import Reducer from 'reducers';
import createSagaMiddleware from 'redux-saga';
import rootSaga  from 'sagas';

import GAListener from 'components/GAListener';
import App from './app';

// get the state from a global variable injected into the server-generated HTML
const preloadedState = window.__PRELOADED_STATE__ || null;

// Allow the passed state to be garbage-collected
delete window.__PRELOADED_STATE__;

// create and apply middleware
const sagaMiddleware = createSagaMiddleware();
const middleware = applyMiddleware(sagaMiddleware);
const reduxMiddleware = window.__REDUX_DEVTOOLS_EXTENSION__ ? compose(middleware, window.__REDUX_DEVTOOLS_EXTENSION__()) : middleware;

const SpeechClient = () => {
  // create teh store
  let store;
  if (preloadedState) {
    store = createStore(Reducer, preloadedState, reduxMiddleware);
  } else {
    store = createStore(Reducer, reduxMiddleware);
  }

  // run the saga middlweare
  sagaMiddleware.run(rootSaga);

  // render the app
  hydrate(
    <Provider store={store}>
      <BrowserRouter>
        <GAListener>
          <App />
        </GAListener>
      </BrowserRouter>
    </Provider>,
    document.getElementById('react-app')
  );
};

module.exports = SpeechClient;