code: function initWatch(obj, depValues, dependencies) {
    var len = dependencies.length;
    if (len === 0) {
      return false;
    }
    var i = 0;
    while (len--) {
      var dep = dependencies[i++];
      var value = clone(get(obj, dep));
      set(depValues, dep, value);
    }
    return true;
  }
docs: Setup the storage object for watching dependencies.
  
  @param  {Object}  `obj`          Object property is being added to.
  @param  {Object}  `depValues`    Object used for storage.
  @param  {Array}   `dependencies` Dependencies to watch
  @return {Boolean} Return if watching or not.
  @api private