Simple Example to demonstrate problem with react-redux connect() function and react-router v4

redux-react-router-problem.js

// Example of non-working react-router v4

// If <Router> is moved into BasicExample
// OR
// redux connect() call is removed routing will work again

// Tested with:

// ├─ [email protected]
// ├─ [email protected]
// │  ├─ hoist-non-react-statics@^1.0.3
// ├─ [email protected]
// │  └─ react-router@^4.0.0
// ├─ [email protected]
// ├─ [email protected]
// ├─ [email protected]

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import {createStore} from 'redux';
import {Provider, connect} from 'react-redux';
import {
  BrowserRouter as Router,
  Route,
  Link
} from 'react-router-dom'

function testReducer(state = {}, action = {}) {
  return Object.assign({}, state, {
    test: "redux store data"
  });
}

const store = createStore(testReducer);

// <Router> moved to parent component
const BasicExampleOrg = ({test = "no redux connect?"}) => (
      <div>
        <ul>
          <li><Link to="/">Home</Link></li>
          <li><Link to="/about">About</Link></li>
          <li><Link to="/topics">Topics</Link></li>
        </ul>

        <hr/>
        <pre>{JSON.stringify(test, null, 4)}</pre>

        <Route exact path="/" component={Home}/>
        <Route path="/about" component={About}/>
        <Route path="/topics" component={Topics}/>
      </div>
)

const Home = () => (
  <div>
    <h2>Home</h2>
  </div>
)

const About = () => (
  <div>
    <h2>About</h2>
  </div>
)

const Topic = ({ match }) => (
  <div>
    <h3>{match.params.topicId}</h3>
  </div>
)

const Topics = ({ match }) => (
  <div>
    <h2>Topics</h2>
    <ul>
      <li>
        <Link to={`${match.url}/rendering`}>
          Rendering with React
        </Link>
      </li>
      <li>
        <Link to={`${match.url}/components`}>
          Components
        </Link>
      </li>
      <li>
        <Link to={`${match.url}/props-v-state`}>
          Props v. State
        </Link>
      </li>
    </ul>

    <Route path={`${match.url}/:topicId`} component={Topic}/>
    <Route exact path={match.url} render={() => (
      <h3>Please select a topic.</h3>
    )}/>
  </div>
)

function mapStateToProps(state) {
  return {
    test: state.test,
  };
}

const BasicExample = connect(
    mapStateToProps
)(BasicExampleOrg);

class App extends Component {
  render() {
    return (
      <Provider store={store}>
        <Router>
          <BasicExample />
        </Router>
      </Provider>
    );
  }
}

ReactDOM.render(
  <App />,
  document.getElementById('root')
);