javascript - Moving from react router 3.x to 4.x

Question

How can I move to using https://cdnjs.cloudflare.com/ajax/libs/react-router/4.0.0-2/react-router.min.js from using https://cdnjs.cloudflare.com/ajax/libs/react-router/3.0.1/ReactRouter.min.js?

Example using 3.x below.

HTML

<script src="https://unpkg.com/[email protected]/dist/react.min.js"></script>
<script src="https://unpkg.com/[email protected]/dist/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-router/3.0.1/ReactRouter.min.js"></script>

JS

let { Router, IndexRoute, Redirect, Route, Link, browserHistory } = ReactRouter;

history.replaceState(0,0,'/');

const Main = () =>
  <Router history={browserHistory}>

    <Route path='/' component={App}>
      <IndexRoute component={Home}/>
      <Route path='map' component={Map}/>
      <Route path='settings' component={Settings}/>
            <Redirect from='foo' to='/' />
      <Route path='*' component={NotFound}/>
    </Route>

  </Router>

const App = props => 
  <div>
    <Navigation>
      <Link to='/map'>Map</Link>
      <Link to='/settings'>Settings</Link>
      <Link to='/foo'>Foo</Link>
    </Navigation>

    {props.children}

  </div>

const Navigation = props => <nav {...props} />
const Home = () => <h1>Home</h1>
const Map = () => <h1>Map</h1>
const Settings = () => <h1>Settings</h1>
const NotFound = (props) => <h1>404 - Not Found</h1>

ReactDOM.render(<Main />, document.body);

See it in action at: https://jsfiddle.net/developit/nvpr63eg/

If I move to any of the CDN hosted 4.x versions though it doesn't work (unreachable code after return statement).

Answer 1

I was able to configure it with redux by changing a few things:

First, browserHistory is not defined on react-router anymore. One way to get it back is to use the package history.

You will need to install (redux optional):

npm i -S history react-router react-router-redux

Instead of trying to import browserHistory use:

import { createBrowserHistory } from 'history';

If you want to use redux then import this and add it to your combined reducers:

import { routerReducer as routing } from 'react-router-redux';

combineReducers({
  home, about,
  routing, // new
});

Next you create the history object

// redux
import { syncHistoryWithStore } from 'react-router-redux';
const history = syncHistoryWithStore(createBrowserHistory(), store);

// regular
const history = createBrowserHistory();

Then change your router to use the new history object

<Router history={ history } children={ Routes } />

Everything else should be the same.

---

If anyone runs into The prop history is marked as required in Router, but its value is undefined.

It is because browserHistory is no longer available in react-router, see post to use history package instead.

---

Related

• Github ts-react-redux-startup: Project that uses it
• Migrating to React Router 4 with Redux