Chapter 11: Implementing GraphQL Subscriptions

In the previous chapter, we learned how to use Apollo Client to send queries and mutations to the backend API that we implemented previously to fetch paginated posts and comments, as well as create new comments and likes.

In this chapter, we'll continue building our users' profile components before learning how to add realtime support to our application. This will allow us to retrieve and display new data from the server without having to constantly refresh the app. We'll utilize GraphQL subscriptions with Apollo Client and Angular to do this.

Then, we'll configure Apollo Client for GraphQL subscriptions and show you how to get and display notifications in the application's header through a badge. GraphQL subscriptions allow the app to acquire new data from the server without having to manually refresh the app.

In this chapter, we will cover the following topics:

• Persisting the component state...