ngOnInit() {
    const queryObs = this.apollo.watchQuery({
      query: gql`
        query allPosts {
          allPosts {
            id
            content
          }
        }
      `
    });

    this.allPostsSub = queryObs.subscribe(({data, loading}: any) => {
      this.posts = data.allPosts;
      this.loading = loading;
    });

    const wsClient = new SubscriptionClient('<ws://subscriptions.graph.cool/cj1cd3wb70zy80113yybu3gux>', {
      timeout: 10000
    });

    wsClient.subscribe({
      query: `subscription {
        allPosts {
          id
          content
        }
      }`,
      variables: null
    }, (err, res) => {
      queryObs.refetch();
    });
  }

graphql-tag/printer

graphql/language/printer