Optional
See https://emscripten.org/docs/api_reference/module.html#Module.instantiateWasm
This callback will be invoked when the CanvasKit loader needs to fetch a file (e.g. the blob of WASM code). The correct url prefix should be applied.
the name of the file that is about to be loaded.
See https://emscripten.org/docs/api_reference/module.html#Module.instantiateWasm