The default behavior. The listener attempts to return initial snapshot from cache and retrieve up-to-date snapshots from the Firestore server. Snapshot events will be triggered on local mutations and server-side updates.

The listener retrieves data and listens to updates from the local Firestore cache without attempting to send the query to the server. If some documents gets updated as a result from other queries, they will be picked up by listeners using the cache.

Note that the data might be stale if the cache hasn’t synchronized with recent server-side changes.