/**
* @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/collectstylesheets
*/
/**
* A helper function for getting concatenated CSS rules from external stylesheets.
*
* @param stylesheets An array of stylesheet paths delivered by the user through the plugin configuration.
*/
export declare function collectStylesheets(stylesheets?: Array<string>): Promise<string>;