This is great. I am using WASM right now for a music training product I plan on launching in the next few months, and it has been so much nicer than doing it all in JS. I have an audio scheduler running in C++ in an audioworklet, an engine running in s7 Scheme (which runs in compiled C in WASM), and user interface code in JavaScript. The plumbing was a bit involved to figure out the architecture, but now that that's done, I wouldn't go back to plain JS or TypeScript for anything. I love that I can reuse my engine and scheduler/synthesis code from desktop contexts.
Very happy WebAssembly user[0] reporting in. I even wrote a blog post[1] about it. I hope the Go compiler lands support[2] for multi-threaded WebAssembly some time this year.