256712 2023-05-12 09:48:00 -0700 structuredClone throws for FileSystemHandles (Origin Private File System) 2025-05-22 04:31:38 -0700 1 1 1 Unclassified WebKit WebCore Misc. Safari 16 Mac (Apple Silicon) macOS 13 NEW https://bugs.webkit.org/show_bug.cgi?id=273906 BrowserCompat, InRadar P2 Normal --- 1 where webkit-unassigned jozefchutka karlcow me sihui_liu webkit-bug-importer oldest_to_newest 1955015 0 where 2023-05-12 09:48:00 -0700 Given the following code: > await navigator.storage.getDirectory().then(structuredClone) the expected output would be: > FileSystemDirectoryHandle {kind: 'directory', name: ''} but instead, Safari throws: > DataCloneError: The object cannot be cloned. Among other things, this lack of serializability means that file system handles cannot be passed to workers to enable write operations. 1975011 1 webkit-bug-importer 2023-09-01 08:58:47 -0700 <rdar://problem/114823273> 2074204 2 karlcow 2024-11-10 22:01:58 -0800 *** Bug 282529 has been marked as a duplicate of this bug. *** 2118951 3 jozefchutka 2025-05-22 04:31:38 -0700 Hi! I wanted to follow up on this issue. I am still encountering this error in Safari Version 18.5 (20621.2.5.11.8): `DataCloneError: The object can not be cloned.` It occurs when trying to use FileSystemDirectoryHandle with `structuredClone()` or `postMessage()` to a Worker. This behavior diverges from Chrome and Firefox, which support structured cloning for FileSystemDirectoryHandle. Any updates or thoughts on prioritizing a fix would be greatly appreciated. Thanks for all your work on WebKit!