/**
 * @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 heading/headingbuttonsui
 */
import { Plugin } from 'ckeditor5/src/core.js';
/**
 * The `HeadingButtonsUI` plugin defines a set of UI buttons that can be used instead of the
 * standard drop down component.
 *
 * This feature is not enabled by default by the {@link module:heading/heading~Heading} plugin and needs to be
 * installed manually to the editor configuration.
 *
 * Plugin introduces button UI elements, which names are same as `model` property from {@link module:heading/headingconfig~HeadingOption}.
 *
 * ```ts
 * ClassicEditor
 *   .create( {
 *     plugins: [ ..., Heading, Paragraph, HeadingButtonsUI, ParagraphButtonUI ]
 *     heading: {
 *       options: [
 *         { model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },
 *         { model: 'heading1', view: 'h2', title: 'Heading 1', class: 'ck-heading_heading1' },
 *         { model: 'heading2', view: 'h3', title: 'Heading 2', class: 'ck-heading_heading2' },
 *         { model: 'heading3', view: 'h4', title: 'Heading 3', class: 'ck-heading_heading3' }
 *       ]
 *      },
 *      toolbar: [ 'paragraph', 'heading1', 'heading2', 'heading3' ]
 *   } )
 *   .then( ... )
 *   .catch( ... );
 * ```
 *
 * NOTE: The `'paragraph'` button is defined in by the {@link module:paragraph/paragraphbuttonui~ParagraphButtonUI} plugin
 * which needs to be loaded manually as well.
 *
 * It is possible to use custom icons by providing `icon` config option in {@link module:heading/headingconfig~HeadingOption}.
 * For the default configuration standard icons are used.
 */
export declare class HeadingButtonsUI extends Plugin {
    /**
     * @inheritDoc
     */
    init(): void;
    /**
     * Creates single button view from provided configuration option.
     */
    private _createButton;
}