To generate the Graph API Client run the following:

1. Install the generator npm install -g graphql-typed-client
2. generate-graphql-client --endpoint https://us-central1-apptreeio-sandbox.cloudfunctions.net/graphapi --output ./lib/chat_service

Using the generated client

    const resp = await this.graphChatService.chain.query
                           .thread({ id: "1234" })
                           .execute({ completed: 1, topic: 1 });