ngx-wig | also Angular 12 ) WYSIWYG HTML Rich Text Editor | Command Line Interface library

The APIs and interfaces are different between both the web client and backend SDKs. They don't share common definitions for Firestore data types, so there's nothing you can say in your interface that would compile and work for both, short of having both definitions imported in all of your code, and using a union type to accept both of them.

To be specific, the firebase module for web clients exports firebase.firestore.GeoPoint, whereas firebase-admin re-exports the Google Cloud SDK's firestore.GeoPoint. They simply aren't the same object, and you can't coerce them to actually be the same. The same is true for other types such as FieldValue and Timestamp - they are simply different types between different libraries.

Probably the best you can do here is create your own abstraction layer that can be implemented by both SDKs. So, you would introduce your own GeoPoint interface, and provide objects behind the scenes that implement that interface no matter which SDK generated the document. It's really a lot of work just to share some interfaces between front and backend, but that's how it'll have to go if you're unwilling to import the SDKs on both sides.