Firebase Interface: SnapshotListenOptions firebase.firestore.SnapshotListenOptions interface static Options for use with `Query.onSnapshot() to control the behavior of the snapshot listener. Abstract type includeMetadataChanges inner boolean Raise an event even if only metadata of the query or document changes. Default is false. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 16, 2018.