jayphelps

function isObject(value) {
  // Avoid an old bug in Chrome 19-20
  // See https://code.google.com/p/v8/issues/detail?id=2291
  const type = typeof value;
  return type === 'function' || (!!value && type === 'object');
}

function ofPropertyChanges(obj, key) {
  if (isObject(obj) === false) {
    return Rx.Observable.return(undefined);