I don't know all the issues but AFAICT wasm is just executing code. The libraries you provide for it are up to you. So if you so, for example, thinking of node,

I don't know all the issues but AFAICT wasm is just executing code. The libraries you provide for it are up to you. So if you so, for example, thinking of node, if I expose `fs.openSync` `fs.readSync`, `fs.writeSync` and `fs.closeSync` what's missing that wasm can't write to disk?