Manual/webgl-interactingwithbrowserscripting

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Manual/webgl-interactingwithbrowserscripting

https://docs.unity3d.com/Manual/webgl-interactingwithbrowserscripting.html

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Comment by @Ragzouken:

It seems that SendMessage is no longer in global scope (see here)) - look at the html template for your webgl game and you'll need something like gameInstance.SendMessage instead

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Comment by @iBicha:

If you want to build your c++ code into a binary .bc file, you're supposed to install the SDK. But you can do that without installing it since emscripten is bundled with Unity.
The best approach is to create a config file similar to PlaybackEngines\WebGLSupport\BuildTools\emscripten.config, and set where everything is (Node.js, LLVM, etc) which should all be in the WebGLSupport folder anyway.
Finally, when calling emcc to compile code, add the option --em-config and point to the file where you have your config. This allows you to compile with emscripten, without messing up with env vars.
Pro tip: cmake can make this more stright forward. check out PlaybackEngines\WebGLSupport\BuildTools\Emscripten\cmake\Modules\Platform\Emscripten.cmake. make a copy of the toolchain file, and change the call to "emcc -v" to "emcc -v --em-config " so it doesn't fail to find the config when the SDK is not installed.
And also add the --em-config option to the CMAKE_C_FLAGS, so "cmake install" calls emcc correctly, with your settings.
More info here and here.