},
/**
- * @param {!Array.<!Object.<{type: string=, is_default: boolean=}>>} options
- * @return {Object.<{type: string=, is_default: boolean=}>} Default color
+ * @param {!Array.<!Object.<{type: (string|undefined),
+ * is_default: (boolean|undefined)}>>} options
+ * @return {Object.<{type: (string|undefined),
+ * is_default: (boolean|undefined)}>} Default color
* option of the given list.
* @private
*/