npm module: Electron and Node linuxduino.wasm file load

[jgarzagu]

Currently is difficult to load a wasm file from another directory. When installing the linuxduino npm module there is an error when requiring linuxduino as it files to load wasm. See (emscripten-core/emscripten#5342). Currently there is no an actual solution from emscripten.

Solution/Workaround

Knowing that this code will only run on linux the following code in the linuxduino.js output was modified:

var wasmBinaryFile = Module['wasmBinaryFile'] || 'serial.wasm');

to this:

if (typeof window === 'object') {
	// If running Electron+Node
	var wasmBinaryFile = Module['wasmBinaryFile'] || 'serial.wasm';
	} else {
	// If running Node
	var wasmBinaryFile = Module['wasmBinaryFile'] || (__dirname+'/serial.wasm');
} 

This works perfect for running linuxduino with node. But when using Electron with the linuxduino code hosted from a server you need to include the linuxduino.wasm file next to the file that does the require('linuxduino') in the server files.

TODO: Find a better solution or wait for emscripten to solve this.