254726 2023-03-29 23:53:57 -0700 File System Standard: WebKit does not implement `FileSystemFileHandle.createWritable()` and `FileSystemWritableFileStream` 2025-05-27 20:46:10 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 283841 InRadar P2 Normal --- 231706 1 tomac webkit-unassigned 03_placid_daft amanisalim benjamin casistaken chrisguttandin daxpedda jozefchutka karlcow mjo2089 sihui_liu webkit-bug-importer oldest_to_newest 1945259 0 tomac 2023-03-29 23:53:57 -0700 The following test fails in WebKit: - 'createWritable' in FileSystemFileHandle.prototype - FileSystemWritableFileStream is undefined Spec: - https://fs.spec.whatwg.org/#api-filesystemfilehandle-createwritable - https://fs.spec.whatwg.org/#api-filesystemwritablefilestream I also want to report a small documentation bug: https://webkit.org/blog/12257/the-file-system-access-api-with-origin-private-file-system/#:~:text=FileSystemHandle%2C%20which%20represents%20an%20entry%20in%20the%20file%20system.%20It%20is%20available%20in%20Worker%20and lacks the word `Window`. 1946961 1 webkit-bug-importer 2023-04-05 23:54:17 -0700 <rdar://problem/107697642> 1947147 2 03_placid_daft 2023-04-06 15:25:02 -0700 I'm really interested in this functionality to be implemented in WebKit. I'm working on a note-taking app for the web. Currently, all user's data is stored in IndexedDb, which has a lot of limitations. I want to use instead the origin private file system to store users' notes and attachments which later will be synced with Git. For my use case, It's not really practical to use WebWorker (the only supported solution for now in WebKit) just to save notes and attachments, also it creates some overhead with transferring data between the main thread and WebWorker. This is already supported in Chromium-based browsers and it would be great to see this in WebKit 1952075 3 amanisalim 2023-04-30 00:14:49 -0700 I also need this for my own vocabulary PWA. It has many features which I miss on every other App. I have to save serialized Jsons and read them, when I am offline. I tried it with Chrome (Linux) and it works as expected. The PWA works great on my iPhone and iPad when I am online, but I need it offline. Now I have to try the other method with the webworker… 2017146 4 mjo2089 2024-02-27 04:20:06 -0800 Also would like to throw my support behind this - blocking current work. 2017686 5 benjamin 2024-02-28 21:25:27 -0800 This bug makes it really difficult to write reliable cross-browser apps. I very interested in this fix, too. Thanks! 2043747 6 casistaken 2024-06-29 03:31:56 -0700 Jimmy Warting aka Endless managed to polyfill this functionality in his `native-file-system-adapter`, safari implements writes via `fileHandle.createSyncAccessHandle()` but only inside workers, so he exposed that functionality in the main thread with some magic, simply `import 'native-file-system-adapter/src/FileSystemFileHandle.js'` and you should be good to go. More info: https://github.com/jimmywarting/native-file-system-adapter 2120019 7 karlcow 2025-05-27 18:15:12 -0700 See https://github.com/WebKit/WebKit/commit/92cb5665c378bef8d73a61a782ad57291520f77d * 'createWritable' in FileSystemFileHandle.prototype Returns true in STP 219. * FileSystemWritableFileStream is defined. Probably can be marked as a duplicate of Bug 283841 2120054 8 karlcow 2025-05-27 20:46:10 -0700 *** This bug has been marked as a duplicate of bug 283841 ***