code: function setItem(key, value) {
      storage[key] = value;
      cookie.setItem('koekje', qs.stringify(storage, prefix));
  
      koekje.length++;
    }
docs: Add a new item in the storage.
  
  @param {String} key Name under which we store the value.
  @param {String} value Value for the key.
  @returns {Undefined}
  @api public