How to filter who might receive a subscription

NotificationSentSubscription.js

import { NotificationSentModel } from '@entities';
import { GraphQLID, GraphQLNonNull } from 'graphql';
// import { subscriptionWithClientId } from 'graphql-relay-subscription';
import { withFilter } from 'graphql-subscriptions';
import { fromGlobalToId, subscriptionObjectType } from './utils';

import pubSub, { EVENTS } from '../../../pubSub';
import NotificationSentType from '../NotificationSentType';

const subscriptionAsyncIterator = () => pubSub.asyncIterator(EVENTS.NOTIFICATION.SENT);
const subscriptionFilter = (root, args) => {
  const meUserId = fromGlobalToId(args.meUserId);

  // @TODO - improve the asymptotic complexity
  return root.toUsersIds.some((id) => id === meUserId);
};

const CreatedNotificationSubscription = subscriptionObjectType({
  name: 'NotificationSentSubscription',
  description: 'Subscribe notification and publish event to all or specific users',
  inputFields: {
    meUserId: {
      type: GraphQLNonNull(GraphQLID),
    },
  },
  outputFields: {
    notificationSent: {
      type: NotificationSentType,
    },
  },
  subscribe: withFilter(subscriptionAsyncIterator, subscriptionFilter),
  getPayload: async ({ notification }, input) => {
    const meUserId = fromGlobalToId(input.meUserId);
    const notificationSent = await NotificationSentModel().getNotificationSentToUser(notification.id, meUserId);

    return { notificationSent };
  },
});

export default CreatedNotificationSubscription;