Sorry about binaryen.js - those JS/TS bindings could be a lot better, and better documented, but priorities are generally focused on improving optimizations in core Binaryen.

That is, most work in Binaryen is on improving wasm-opt which inputs wasm and outputs wasm, so any toolchain can use it (as opposed to just JS/TS).

But if someone had the time to improve the JS/TS bindings that would be great!