gistfile1.js

import { Actions, Store, Flux } from 'flummox';

class MessageActions extends Actions {
  newMessage(content) {
    return content; // automatically dispatched
  }
}

class MessageStore extends Store {
  constructor(flux) {
    super();

    const messageActions = flux.getActions('messages');
    this.register(messageActions.newMessage, this.handleNewMessage);
    this.messageCounter = 0;

    this.state = {};
  }

  handleNewMessage(content) {
    const id = this.messageCounter++;

    console.log(this.state);

    this.setState({
      [id]: {
        content,
        id,
      },
    });

    console.log(this.state);
  }
}

export default class flux extends Flux {
  constructor() {
    super();

    this.createActions('messages', MessageActions);
    this.createStore('messages', MessageStore, this);
  }
}

gistfile2.js

  appRouter.get('*', (req, res) => {

    const flux = new Flux;
    flux.getActions('messages').newMessage('Hello, world!');

    var router = Router.create({
      routes: routes,
      location: req.originalUrl,
    });

    router.run(function (Handler) {
      var content = React.renderToString(<Handler flux={flux} />);
      return res.render('app.ejs', {content: content, flux: flux.serialize()});
    });
  });