ustk-todolist/react/src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import thunk from 'redux-thunk';
import { Provider } from 'react-redux';
import { applyMiddleware, createStore, compose } from 'redux';
import { offline } from '@redux-offline/redux-offline';
import offlineConfig from '@redux-offline/redux-offline/lib/defaults';

import AppContainer from './containers/AppContainer';
import registerServiceWorker from './registerServiceWorker';
import todoApp from './reducers';
import { setToken } from './actions/util';

let store;

const persistCallback = () => {
  const state = store.getState();
  if (state.user.user) {
    setToken(state.user.user.jwt);
  }
  ReactDOM.render(
    <Provider store={store}>
      <AppContainer />
    </Provider>,
    document.getElementById('root'),
  );
};

store = createStore(
  todoApp,
  compose(
    applyMiddleware(thunk),
    offline({ ...offlineConfig, persistCallback }),
  ),
);

registerServiceWorker();