Add Deno File System Support

[okikio]

Describe the feature

Deno has a built-in file system storage API's, it would be great if we can use it with unstorage!

Additional information

• Would you be willing to help implement this feature?

[okikio]

I would love to help implementing this feature but I'm unfortunately unavailable

[so1ve]

I think you can simply import unstorage via npm:unstorage and the file system will be polyfilled

[okikio]

The goal is to support the Deno API is places other than Deno, e.g. there's a Deno library using the Deno FS API, this would allow said library to be supported in the browser or on Node

[pi0]

Deno v2 has a decent support for Node.js compatibility now so it immediately doesn't makes much sense to put effort. We recently also added support for Deno KV (both Node and Deno).

In the future, fs driver might be rebased to use (upcoming) unfs to directly use native runtime APIs.

[okikio]

Is unfs going to be a separate project?

[pi0]

yes (and to be used for fs driver internally when ready) but mostly for semantic reasons rather than functionality (as Deno supports Node.js fs API today)

[okikio]

The Node.js fs API is an abstraction over Deno's native implementation and has perf. impacts, it's actually the same for Bun, Bun slows down quite a bit when using Node.js's fs APIs. Supporting the native runtime fs APIs which are built on web stds. anyway is still necessary imo.

[pi0]

Deno/Bun fs APIs are not based on Web Standards it's their runtime API.

There might be indeed slight performance improvement in this which is one of the reasons planning to work on unfs migration, however please consider that it is not remarkable perf gain.

[okikio]

Oh really? Last I tested the perf., the difference was fairly notable 🤔, maybe they've optimized the abstractions