Presence in Firestore
This template shows you how to build a presence (understanding which users are online / offline) in Cloud Firestore and Realtime Database.
See file functions/index.js for the code.
The dependencies are listed in functions/package.json.
Sample Database Structure
As an example we'll be using a secure note structure:
/status /UID_A state: "online" /UID_B state: "offline"
Whenever a new note is created or modified a Function sends the content to be indexed to the Algolia instance.