JavaScript in WebAssembly

WebAssembly runs in the same thread that you're invoking it from this is important because when you're calling into WebAssembly so basically when you compile there is a subtle difference here. When WebAssembly is compiled from a source language such as Ross into the WebAssembly bytecode that generates bytecode a WebAssembly Bytecode. But inside whatever runtime you're using be that we ate or wasn't time or whatever long time that you're using it still needs to compile  in the same way that JVM needs to compile to the target architecture of your computer.