How to listen for “Stop sharing” click in Chrome DesktopCapture API

I solved this issue by assigning an EventHandler on the videoTrack’s onended property:

  // somebody clicked on "Stop sharing"
  stream.getVideoTracks()[0].onended = function () {
    // doWhatYouNeedToDo();
  };

As far as my edit goes (noticing a closing window): it also fires the event.