feat: show a demo that users can interact with using WASM

[HarikrishnanBalagopal]

Feature Request

Overview

This library compiles nicely to WASM with just a small wrapper.
It can be used to show a demo and/or for using this library in languages other than Golang.
I have a working demo here https://haribala.dev/starlark-webasm-demo/
The code is here https://github.com/HarikrishnanBalagopal/starlark-webasm
and here https://github.com/HarikrishnanBalagopal/starlark-webasm-demo

[adonovan]

This is really cool! I'm curious what the performance overhead is of compiling the interpreter from Go to wasm. Have you tried running any of the benchmarks in the starlark-go tree? (If Go's testing package is a challenge for wasm you could just run go test and observe how many iterations of each benchmark get run and then just rewrite the benchmarks as simple loops of a fixed count and see how long they take.

I imagine JavaScript programs would also want a slightly different API to the interpreter. Have you tried passing JavaScript values (and especially functions) in and out of Starlark programs?

[laurentlb]

Nice! I made something similar too:

• https://laurent.le-brun.eu/starlark/
• https://github.com/laurentlb/try-starlark