Improve EventSource constructor's parameters typing.
* @externs
*/
+/** @record */
+function EventSourceInit() {};
+
+/** @type {(boolean|undefined)} */
+EventSourceInit.prototype.withCredentials;
+
/**
* @constructor
* @implements {EventTarget}
* @param {string} url
- * @param {Object=} opt_eventSourceInitDict
+ * @param {EventSourceInit=} opt_eventSourceInitDict
*/
function EventSource(url, opt_eventSourceInitDict) {}
