Clarification on persistent file system access in browsers

[vincent-herlemont]

When you talk about 'FileSystem access' in browsers, does this mean that the data is persistent? Through OPFS or another storage offered by browsers?

---

Context vincent-herlemont/native_db#65

[linear]

SDK-74 Clarification on persistent file system access in browsers

[Michael-F-Bryan]

When you use the new Directory() constructor, it will create a temporary in-memory filesystem that is backed by a virtual_fs::mem_fs::FileSystem.

In #337, I'm adding a static Directory.fromBrowser() function which will create a Directory backed by the browser's FileSystem API. That means you'd be able to mount a directory backed by OPFS or the FileSystemDirectoryHandle you get from window.showDirectoryPicker().

That PR hasn't been merged yet, but that's mainly because we chose to implement the easier in-memory version first and add support for the FileSystem API after making @wasmer/sdk public.

[MentalGear]

Amazing work! Any indication when persistent OPFS will be available? This would allow for such high-demand applications like vector search in the browser by the very popular usearch library.