Need help with creating a JS class instance in C++

[sasmaster]

Hello!
I am following this example to instantiate JavaScript objects in C++. But my case is more complex as I need to pass an object with callbacks into class's constructor and I am not sure how to do this. Here is the code I need to translate to emscr API:

  const decoder = new VideoDecoder({
    output(frame) {
      // Update statistics.
      if (startTime == null) {
        startTime = performance.now();
      } else {
        const elapsed = (performance.now() - startTime) / 1000;
        const fps = ++frameCount / elapsed;
        setStatus("render", `${fps.toFixed(0)} fps`);
      }

      // Schedule the frame to be rendered.
      renderFrame(frame);
    },
    error(e) {
      setStatus("decode", e);
    }
  });

In cpp I have written this:

  emscripten::val VideoDecoder = emscripten::val::global("VideoDecoder");
		if (!VideoDecoder.as<bool>())
		{
			LogError("No global VideoDecoder,check if your web browser supports this extension,(currentlu supported by Chrome and Edge");
			 
		}
		mVideoDecoder = VideoDecoder.new_();

What can .new_() accept? Can I fetch it a struct with function pointers to those callbacks? Or it doesn't map 1:1 to the setup in Js?

VideoDecoder class constructor has the following signature:

const videoDecoder = new VideoDecoder({
            output: processVideo,
            error: onEncoderError,
        });

Thanks in advance!

[sasmaster]

Ping. Anyone?