graphql-subscriptions

GraphQL subscriptions is a simple npm package that lets you wire up GraphQL with a pubsub system (like Redis) to implement subscriptions in GraphQL. You can use it with any GraphQL client and server (not only Apollo). To begin with GraphQL subscriptions, start by defining a GraphQL Subscription type in your schema. Next, add the Subscription type to your schema definition. Now, let's create a simple PubSub instance - it is a simple pubsub implementation, based on EventEmitter. Alternative EventEmitter implementations can be passed by an options object to the PubSub constructor. Now, implement your Subscriptions type resolver, using the pubsub.asyncIterator to map the event you need. When publishing data to subscribers, we need to make sure that each subscriber gets only the data it needs.