clone-built-in-object.js

/*
 * Some JS objects like InputDeviceInfo or GeolocationCoordinates are impossible to clone easly.
 * `Object.keys(obj)` returns `{}`
 * `JSON.stringify(obj)` returns `{}`
 * 
 * with following functions you're able to clone object properties to the simple object.
 */

function cloneGeolocationCoordinates(instance) {
  return Object.keys(instance.constructor.prototype).reduce((acc, key) => {
    acc[key] = instance[key];
    
    return acc;
  }, {});
}

function cloneInputDeviceInfo(instance) {
  const result = Object.keys(MediaDeviceInfo.prototype).reduce((acc, key) => {
    acc[key] = instance[key];
    
    return acc;
  }, {});
  delete result.toJSON;
  return result;
}