Firebase Docs Reference FirebaseStorage Framework Reference Constants The following constants are available globally. StorageVersionString Project version string for FirebaseStorage. Declaration Swift let StorageVersionString: UnsafePointer<UInt8> StorageErrorDomain Firebase Storage error domain. Declaration Swift let StorageErrorDomain: String 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 June 20, 2018.