Running wasm-merge in the browser

[Joeoc2001]

I'm building a system to load sandboxed user code, and as a part of my implementation I want to dynamically link Wasm modules together at runtime. I'm already using binaryen.js but it looks like the node builds of the tools aren't made to be run in the browser, and it also seems that the JS bindings don't cover enough of the internals of binaryen for me to do a naive CPP to JS translation of wasm-merge.cpp. What's (probably) the easiest route for me to get this working? Should I fork wasm-merge.cpp to make it non-CLI and re-run emmake, or should I expand the JS bindings of binaryen.js, or am I missing something else entirely?

[kripken]

Simplest might be to compile wasm-merge as it is, then write some JS to wrap around its main() (get a buffer, turn that into a file, run, get the file, turn that into a buffer, etc.). Should hopefully be just a few dozen lines of code.