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QuerySnapshot.docChanges() method

Returns an array of the documents changes since the last snapshot. If this is the first snapshot, all documents will be in the list as 'added' changes.

Signature:

docChanges(options?: SnapshotListenOptions): Array<DocumentChange<T>>;

Parameters

Parameter	Type	Description
options	SnapshotListenOptions	SnapshotListenOptions that control whether metadata-only changes (i.e. only DocumentSnapshot.metadata changed) should trigger snapshot events.

Returns:

Array<DocumentChange<T>>