(Not my project, just posting because I think it's pretty neat.)

You need Chrome or Edge to use it, since other browser's haven't yet shipped the required features.

In case anyone missed it, here's the demo link from the repo: https://wasi.rreverser.com/

For those on mobile, or with an incompatible browser, here are some screenshots:

After typing `mount /files`: https://i.imgur.com/Jv6aTFY.png

After trying to echo into a file: https://i.imgur.com/FXTTRar.png

You can do all the basics like mkdir/cat/ls/echo/...