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Someday, I'd like to see Wasi-based webassembly containers. It'd be awesome to spin up a sandboxed shell with file access in a webpage.

You can actually do this with WebContainers today :) Try it out here: https://stackblitz.com/fork/node

Full WASI support in WebContainer is landing in the next 1-2 months.

why do you want to spin up a shell with file access in a webpage?

So you can open up your local project directory in your browser-based IDE and have it work like you expect.

My wish was actually to be able to spin up a shell locally on a github repo that pulls stuff over lazily.