You can use jco to both compile a JavaScript module into a WebAssembly Component (with spidermonkey running as wasm inside), and to generate a Javascript embedd

You can use jco to both compile a JavaScript module into a WebAssembly Component (with spidermonkey running as wasm inside), and to generate a Javascript embedding for that component. This solves all of your problems except for untrusted code looping forever, and that’s something which could be added to spidermonkey.wasm. https://github.com/bytecodealliance/jco https://github.com/bytecodealliance/jco You can also run these same components server-side with Wasmtime.