How to check if any local Firestore document has pending writes

Question

I am using Firestore in the browser with offline mode.

How can I check, if there are any updates applied on my client but not yet transacted on the server?

I would like to check this, without knowing the specific documents. I want to know if there are such updates to ANY documents.

I'm wondering if you can do something with waitForPendingWrites. Like: if the task you get from that immediately is completed, there were apparently not pending writes? — Frank van Puffelen
– Frank van Puffelen, Commented Nov 4, 2024 at 22:26

Doug Stevenson · Accepted Answer · 2024-11-04 13:14:27Z

None of the Firestore SDKs on any platform offer an API for this. If this is something you require, you'll have to build your own application component that somehow keeps track of all writes to completion and persists that between app launches.

You're not the first person to ask this, and it's worth writing a feature request for this publicly or privately.

Witek · Accepted Answer · 2024-11-05 09:51:21Z

Call waitForPendingUpdates() and wait for the resulting promise.

https://firebase.google.com/docs/reference/js/firestore_.md#waitforpendingwrites_231a8e0

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