Offline determination in Firestore

It cannot be done on its own. →Another idea: transactions always fail when they are offline, so maybe there is a way to use that.

see: Building a Presence with Cloud Firestore | Firebase

Realtime Database has a special path called ‘.info/connected’. js

firebase.database().ref('.info/connected').on('value', function(snapshot) {
   // If we're not currently connected, don't do anything.
   if (snapshot.val() == false) {
       return;
   };
   ...

What about Cloud Firestore?

Connectivity - This implementation measures connectivity to Realtime Database, not Cloud Firestore. Even the official documentation doesn’t solve the problem with Cloud Firestore, but substitutes a connectivity check with Realtime Database.

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