Different IO

[backkem]

The example currently allows writing to a file (stdout). I wanted to explore how this could support additional types of IO.

Networking
For use cases like services it would make sense to interact over the network. However, it the current GOOS=js build target doesn't support networking. In addition, there is no standardized WASM syscall interface, making it hard to define what a new build target would look like. CraneStation/wasmtime seems to have picked CloudABI for this. That may offer a viable option.

Custom entry points
For use cases like serverless, blockchains, data pipelines, ... it would make sense to interact over custom entry points. To make these possible, it may be worth reevaluating the discussion in golang/go#25612.