I'm writing a fairly lightweight Rust application to be compiled to WebAssembly and run in the browser. This application also includes some much heavier functionality which isn't always needed which I would like, if possible, to load on demand so as not to bog down the browser unneccessarily. This extra functionality is currently written in C++, although porting it to Rust wouldn't be too hard. My current plan is to build the light functionality and heavy functionality as two separate WASM files.

Is there a good way to call from WASM to WASM within the browser without JS as an intermediary (it's okay if both have to be Rust and same compiler version -- my Nix-based build script is more than capable of guaranteeing that), or is marshalling through JS my best bet?

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