Publish Subscribe JS Pattern mini module.

pubsub.js

/**
 * Simple implementation of Publish and Subscribe Pattern
 * 
 * This helps a lot specially when the components are
 * not close enough that passing a function as props
 * looks ugly.
 */
const topics = {};
module.exports = {
  subscribe: function (topic, callback) {
    topics[topic] = topics[topic] || [];
    topics[topic].push(callback);
  },
  publish: function (topic, data) {
    topics[topic] = topics[topic] || [];
    topics[topic].forEach(cb => {
      cb(Object.create(data));
    });
  }
};

I created this for readability in a React App (as a mixin, we could communicate different React Components). BUT it is very un-react-y (bad practice).