Hello, I had trouble loading a model in openCV js. It came from js lack of access to fileSystem. I didn't find any related issue but I resolved the problem thanks to a bit of help from IRC. I'm posting the answer just beneath.

The trick was loading the file trough XML request then giving it to cv.FS_createDataFile. Then you just CascadeCassifier.load(path) to get your model. I couldn't get it to work with parametrized declaration though, but it may be because of emscripten compilation problem.

// parameters:
// path: string to access loaded file trough cv
// url: path of the actual file on your FS
// callback: what to do when file is loaded
createFileFromUrl = function(path, url, callback) {
let request = new XMLHttpRequest();
request.open('GET', url, true);
request.responseType = 'arraybuffer';
request = this;