pubSub.js

/**
 * #### Import members from **@openedx/frontend-base**
 *
 * The PubSub module is a thin wrapper around the base functionality of
 * [PubSubJS](https://github.com/mroderick/PubSubJS).  For the sake of simplicity and not relying
 * too heavily on implementation-specific features, it maintains a fairly simple API (subscribe,
 * unsubscribe, and publish).
 *
 * Publish/Subscribe events should be used mindfully, especially in relation to application UI
 * frameworks like React.  Given React's unidirectional data flow and prop/state management
 * capabilities, using a pub/sub mechanism is at odds with that framework's best practices.
 *
 * That said, we use pub/sub in our application initialization sequence to allow applications to
 * hook into the initialization lifecycle, and we also use them to publish when the application
 * state has changed, i.e., when the config document or user's authentication state have changed.
 *
 * @module PubSub
 */

import PubSub from 'pubsub-js';

export const {
  subscribe,
  unsubscribe,
  publish,
} = PubSub;