text: import BrowserPubSub from './browserPubSub'
  import TopicRegistry from './topicRegistry'
  import NotifierService from './notifierService'
  
  const topicRegistry = new TopicRegistry()
  const notifierService = new NotifierService({ topicRegistry })
  const browserPubSub = new BrowserPubSub({ topicRegistry, notifierService })
  
  export default browserPubSub
  