GraphQL server subscriptions

subscriptions.js

import { PubSub, SubscriptionManager } from 'graphql-subscriptions';
import schema from './schema';

const pubsub = new PubSub();
const subscriptionManager = new SubscriptionManager({
  schema,
  pubsub,
  setupFunctions: {
    tagAdded: (options, args) => {
      console.log(args);
      return {
        tagAdded: tag => {
          // This is not called
          console.log(tag);
          return tag.type === args.type;
        },
      };
    },
  },
});

export { subscriptionManager, pubsub };