get-user-media-debugger.js

(function() {
  const realGetUserMedia = navigator.mediaDevices.getUserMedia;
  const realApplyConstraints = MediaStreamTrack.prototype.applyConstraints;

  function successHandler(...args) {
    try {
      const track = args[0].getVideoTracks()[0];
      console.log('💥💥💥', track.label, 'camera access granted.\n', track.getSettings());
    } catch(err) {
      console.warn('💥💥💥 error', err);
    }
  }
  
  function failHandler(...args) {
    console.warn('💥💥💥 fail handler', args);
  }
  
  navigator.mediaDevices.getUserMedia = function (...args) {
    console.log('💥💥💥 getUserMedia', ...args);

    const result = realGetUserMedia.apply(this, args);
    
    result.then(successHandler, failHandler);
    
    return result;
  };

  MediaStreamTrack.prototype.applyConstraints = function(...args) {
    console.log('💥💥💥 applyConstraints', ...args);

    return realApplyConstraints.apply(this, args);
  };
})();