[pdubroy]

Yes, it can all be found here: https://github.com/wasmgroundup/code

Over the course of the book, we also build up a small library for creating Wasm modules and emitting bytecode; that's available as an NPM package (https://www.npmjs.com/package/@wasmgroundup/emit) and the code is here: https://github.com/wasmgroundup/emit