/**
 * @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
 */
import type { StylesProcessor } from '../stylesmap.js';
/**
 * Adds background CSS styles processing rules to the given `StylesProcessor`.
 *
 * Registers normalizers for the `background` shorthand and its longhand properties,
 * reducers that serialize them back to CSS strings, and the relation mapping between them.
 *
 * ```ts
 * editor.data.addStyleProcessorRules( addBackgroundStylesRules );
 * ```
 *
 * @param stylesProcessor The styles processor instance to register rules on.
 */
export declare function addBackgroundStylesRules(stylesProcessor: StylesProcessor): void;