/**
* @license Copyright (c) 2003-2026, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
*/
/**
* @module utils/spy
*/
/**
* Creates a spy function (ala Sinon.js) that can be used to inspect call to it.
*
* The following are the present features:
*
* * spy.called: property set to `true` if the function has been called at least once.
*
* @returns The spy function.
*/
export declare function spy(): {
	(): void;
	called?: boolean;
};