parcel-plugin-emscripten

Parcel plugin for Emscripten

A Parcel plugin to enable importing a C(++) file inside a JS file.

Emscripten has to be installed and emcc needs to be in PATH.

Example:

import Module from './test.c';
const Instance = Module();

Instance.then(()=>{
    console.log(Instance._add(10,20));
});

// equivalent to

Instance.then((v)=>{
    console.log(v._add(10,20));
});

//test.c
#include <emscripten.h>

int EMSCRIPTEN_KEEPALIVE add(int x, int y) {
    return x + y;
}

For more complex examples, see the example directory.

Instance.then is quite fragile and not a thenable, see https://github.com/kripken/emscripten/issues/5820

Using multiple Modules (= importing multiple C files) is supported, but it isn't very filesize efficient. Consider writing a single C-wrapper and importing that instead!

To pass additional arguments to emcc (change optimization, link another C file or a library, ...), specify them in the first line of your main C file: (this would disable optimizations and compile and link lib.c as well)

//parcel: -O0 lib.c
#include ...