What's the difference between EM_ASM() and EM_JS()? Which is more performant, emscripten_run_script() or EM_ASM()/EM_JS()? What do you need to include in the line above your function if you want to...

What's the difference between EM_ASM() and EM_JS()?

Which is more performant, emscripten_run_script() or

EM_ASM()/EM_JS()?

What do you need to include in the line above your function if you want to use it

outside of your C/C++ code (hint: it starts with EMSCRIPTEN)?