Base Store class with ES6 and CommonJS for Flux

BaseStore.js

let EventEmitter = require('events').EventEmitter;

const CHANGE_EVENT = 'CHANGE_EVENT';

class BaseStore extends EventEmitter {
  emitChange () {
    this.emit(CHANGE_EVENT);
  }

  addChangeListener (callback) {
    this.on(CHANGE_EVENT, callback);
  }

  removeChangeListener (callback) {
    this.removeListener(CHANGE_EVENT, callback);
  }
}

module.exports = BaseStore;

You can write
import EventEmitter from 'eventemitter3' and export default class BaseStore instead of module.exports :)