javascript - How to detect firestore connection failure

Question

I would like to know how it is possible with angularfire2 to know if the cloud firestore database is accessible and that I can get collection values?

The goal here is if it fails, I will go get local data instead.

I have something like

this.afStore.collection('messages').valueChanges().subscribe(
  (messages: any[]) => {

    // DO STUFF
  });

Thanks

Answer 1

Waitting for answers