Relevant repos:

• firebase extension: publish_new_user_data_firebase_extension
• microservice: on_user_creation_microservice

Update: a recent issue discusses extending CloudEvent to parse PubSub messages:

[GoogleCloudPlatform/functions-framework-dart] Parsing pub sub messages (#239)

Before we start

Check project is set correctly (see: gcp gcloud cheat sheet)

• gcloud config get-value core/project

Create a cloud function to publish

From project dir

firebase init

follow: trigger a function on user creation

follow: Manage functions deployment and runtime options > publishing_a_message_from_within_a_function

Follow Manage functions deployment and runtime options

• check runtime - engine value in functions/package.json

Deploy the cloud function: firebase deploy --only functions