gistfile1.js

// UserStore.js
import { EventEmitter } from 'events';
import assign from 'object-assign';

var events = new EventEmitter();

var CHANGE_EVENT = 'change';

var state = {
  user: null
};

var UserStore = {

  addChangeListener(fn) {
    events.on(CHANGE_EVENT, fn);
  },

  removeChangeListener(fn) {
    events.removeListener(CHANGE_EVENT, fn);
  },

  setState(newState) {
    assign(state, newState);
    events.emit(CHANGE_EVENT);
  },

  getState() {
    return state;
  },

  logout() {
    this.setState({ user: null });
  }

};


// usage

import UserStore from './UserStore';

var NavBarUser = React.createClass({
  componentDidMount() {
    UserStore.addChangeListener(this.handleUserStoreChange);
  },

  componentWillUnmount() {
    UserStore.removeChangeListener(this.handleUserStoreChange);
  },

  handleUserStoreChange() {
    this.setState({
      user: UserStore.getState()
    });
  },

  render() {
    //  
  }
});


var MainPage = React.createClass({
  componentDidMount() {
    UserStore.addChangeListener(this.handleUserStoreChange);
  },

  componentWillUnmount() {
    UserStore.removeChangeListener(this.handleUserStoreChange);
  },

  handleUserStoreChange() {
    this.setState({
      user: UserStore.getState()
    });
  }
});