Use environment variables in WebAssembly with Emscripten

It is typical for native C code to poke and probe a shell environment with POSIX getenv and setenv. How would an existing C program continue to rely upon environment variables in the browser? I’ve found that JavaScript can preload environment variables expected by a WebAssembly module using the Emscripten toolchain. Native code This example below queries the environment for a way to greet. // main.cpp #include <cstdlib> #include <iostream> int main(int, char*[]) { std::cout << std::getenv("GREETING") << '!