/**
* @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 mention/mentionui
*/
import { Plugin, type Editor, type PluginDependenciesOf } from "@ckeditor/ckeditor5-core";
import { ContextualBalloon } from "@ckeditor/ckeditor5-ui";
/**
* The mention UI feature.
*/
export declare class MentionUI extends Plugin {
	/**
	* The mention view.
	*/
	private readonly _mentionsView;
	/**
	* Stores mention feeds configurations.
	*/
	private _mentionsConfigurations;
	/**
	* The contextual balloon plugin instance.
	*/
	private _balloon;
	private _items;
	private _lastRequested?;
	/**
	* Debounced feed requester. It uses `es-toolkit#debounce` method to delay function call.
	*/
	private _requestFeedDebounced;
	/**
	* @inheritDoc
	*/
	static get pluginName(): "MentionUI";
	/**
	* @inheritDoc
	*/
	static override get isOfficialPlugin(): true;
	/**
	* @inheritDoc
	*/
	static get requires(): PluginDependenciesOf<[ContextualBalloon]>;
	/**
	* @inheritDoc
	*/
	constructor(editor: Editor);
	/**
	* @inheritDoc
	*/
	init(): void;
	/**
	* @inheritDoc
	*/
	override destroy(): void;
	/**
	* Returns true when {@link #_mentionsView} is in the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon} and it is
	* currently visible.
	*/
	private get _isUIVisible();
	/**
	* Creates the {@link #_mentionsView}.
	*/
	private _createMentionView;
	/**
	* Returns item renderer for the marker.
	*/
	private _getItemRenderer;
	/**
	* Requests a feed from a configured callbacks.
	*/
	private _requestFeed;
	/**
	* Registers a text watcher for the marker.
	*/
	private _setupTextWatcher;
	/**
	* Handles the feed response event data.
	*/
	private _handleFeedResponse;
	/**
	* Shows the mentions balloon. If the panel is already visible, it will reposition it.
	*/
	private _showOrUpdateUI;
	/**
	* Hides the mentions balloon and removes the 'mention' marker from the markers collection.
	*/
	private _hideUIAndRemoveMarker;
	/**
	* Renders a single item in the autocomplete list.
	*/
	private _renderItem;
	/**
	* Creates a position options object used to position the balloon panel.
	*
	* @param mentionMarker
	* @param preferredPosition The name of the last matched position name.
	*/
	private _getBalloonPanelPositionData;
}
/**
* Creates a RegExp pattern for the marker.
*
* Function has to be exported to achieve 100% code coverage.
*
* @internal
*/
export declare function createRegExp(marker: string, minimumCharacters: number): RegExp;