GoogleApi.Firestore.V1.Model.DocumentChange (google_api_firestore v0.21.3) View Source
A Document has changed. May be the result of multiple writes, including deletes, that ultimately resulted in a new value for the Document. Multiple DocumentChange messages may be returned for the same logical change, if multiple targets are affected.
nil) - The new state of the Document. If
maskis set, contains only fields that were updated or added.
nil) - A set of target IDs for targets that no longer match this document.
nil) - A set of target IDs of targets that match this document.