feat(firestore): Include "metadata" property on snapshot

[wibimaster]

Plugin(s)

• Analytics
• App
• App Check
• Authentication
• Crashlytics
• Cloud Firestore
• Cloud Messaging
• Cloud Storage
• Performance
• Remote Config

Current problem

Firestore SDK permits to save data offline and persist online when connection is active.
It let us know when the data is saved offline or online.

This Capacitor plugin doesn't have this option.

Preferred solution

Official documentation (web, swift, java) : https://firebase.google.com/docs/firestore/manage-data/enable-offline?hl=fr#web-modular-api_2

Is it possible to have the same feature on this Capacitor plugin ?

The addCollectionSnapshotListener or addDocumentSnapshotListener could have an option to add metadata property on snapshot result :)

Alternative options

No response

Additional context

No response

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• I have attached links to possibly related issues and discussions.

[robingenz]

I close this as duplicate of #467.

[wibimaster]

@robingenz That's not really a dup', because it's not the same feature ; #467 is about getDocumentChanges() of the querySnapshot, and #567 is about metadata property of a listener. But you can do both at the same time in #467 :)

[robingenz]

Sorry, in this case I keep it open.

[phjardas]

+1 from me. Would be great to have this feature. 😊

[phjardas]

I've drawn a sketch of how the interface could look like, however I'm a bit hesitant to touch the corresponding native code.

[robingenz]

@phjardas Thank you for the inspiration! I would change a few types, see #705. Maybe I'll get to the native implementation this weekend. But you are welcome to try it and create a PR against https://github.com/capawesome-team/capacitor-firebase/tree/feat/issue-567.