# authors The transaction authors that the observer filters for when evaluating history transactions. ``` final let authors: Set ``` ## Discussion When non-empty, the observer only reports changes whose transactions were written by one of the specified authors. When empty, the observer treats transactions from any author as relevant. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)