TexImage3D implementation not working with Emscripten

[yosoymin]

I'm using headless-gl with an Emscripten application over Node.js. When creating 3d textures, I can see an exception with the message "Invalid data type for TexImage3D". I think I've found the problem.

Emscripten calls to texImage3D like this:

GLctx.texImage3D(target, level, internalFormat, width, height, depth, border, format, type, null);

But the internal implementation of TexImage3D in headless-gl checks that the last argument is undefined, but it doesn't consider null a possibility.

if (info[9]->IsUndefined()) { glTexImage3D(target, level, internalformat, width, height, depth, border, format, type, nullptr); } else if (info[9]->IsArrayBufferView()) { auto buffer = info[9].As<v8::ArrayBufferView>(); void *bufferPtr = buffer->Buffer()->GetBackingStore()->Data(); glTexImage3D(target, level, internalformat, width, height, depth, border, format, type, bufferPtr); } else { Nan::ThrowTypeError("Invalid data type for TexImage3D"); }

If possible, it would be nice if null is also considered in the first branch condition.
Thanks.