Leverage File System Standard from browsers

[eduardomourar]

In regards to the Preview2 shim (more specifically wasi:filesystem) for browsers, should we leverage the File System Standard as defined by the WHATWG?

[guybedford]

It's a good question, and a tough one as well when working through the various concerns. The best I can come up with so far is that I think we should integrate with it as opposed to treating it as the entire interface, for example allowing for mounting a local directory as a preopen within the virtual filesystem, but while still being able to have other types of virtual filesystem management existing in parallel. Generic virtualization might allow other kinds of integrations as well similarly to the virt work.

[eduardomourar]

Where do you think the integration can/should be placed? Pluggable at a higher level (JavaScript in the shim) or lower level (e.g. Rust similar to the preview1 adapter)?

[guybedford]

I think it's best suited as a feature of the prevew2-shims? See eg #147.