/**
* @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 engine/model/operation/rootattributeoperation
*/
import { Operation } from "./operation.js";
import { type ModelDocument } from "../document.js";
import { type ModelRootElement } from "../rootelement.js";
import type { ModelSelectable } from "../selection.js";
/**
* Operation to change root element's attribute. Using this class you can add, remove or change value of the attribute.
*
* This operation is needed, because root elements can't be changed through
* {@link module:engine/model/operation/attributeoperation~AttributeOperation}.
* It is because {@link module:engine/model/operation/attributeoperation~AttributeOperation}
* requires a range to change and root element can't
* be a part of range because every {@link module:engine/model/position~ModelPosition} has to be inside a root.
* {@link module:engine/model/position~ModelPosition} can't be created before a root element.
*/
export declare class RootAttributeOperation extends Operation {
	/**
	* Root element to change.
	*/
	readonly root: ModelRootElement;
	/**
	* Key of an attribute to change or remove.
	*/
	readonly key: string;
	/**
	* Old value of the attribute with given key or `null`, if attribute was not set before.
	*
	* @readonly
	*/
	oldValue: unknown;
	/**
	* New value of the attribute with given key or `null`, if operation should remove attribute.
	*
	* @readonly
	*/
	newValue: unknown;
	/**
	* Creates an operation that changes, removes or adds attributes on root element.
	*
	* @see module:engine/model/operation/attributeoperation~AttributeOperation
	* @param root Root element to change.
	* @param key Key of an attribute to change or remove.
	* @param oldValue Old value of the attribute with given key or `null`, if attribute was not set before.
	* @param newValue New value of the attribute with given key or `null`, if operation should remove attribute.
	* @param baseVersion Document {@link module:engine/model/document~ModelDocument#version} on which operation
	* can be applied or `null` if the operation operates on detached (non-document) tree.
	*/
	constructor(root: ModelRootElement, key: string, oldValue: unknown, newValue: unknown, baseVersion: number | null);
	/**
	* @inheritDoc
	*/
	get type(): "addRootAttribute" | "removeRootAttribute" | "changeRootAttribute";
	/**
	* @inheritDoc
	*/
	get affectedSelectable(): ModelSelectable;
	/**
	* Creates and returns an operation that has the same parameters as this operation.
	*
	* @returns Clone of this operation.
	*/
	clone(): RootAttributeOperation;
	/**
	* See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.
	*/
	getReversed(): Operation;
	/**
	* @inheritDoc
	* @internal
	*/
	override _validate(): void;
	/**
	* @inheritDoc
	* @internal
	*/
	override _execute(): void;
	/**
	* @inheritDoc
	*/
	override toJSON(): unknown;
	/**
	* @inheritDoc
	*/
	static override get className(): string;
	/**
	* Creates `RootAttributeOperation` object from deserialized object, i.e. from parsed JSON string.
	*
	* @param json Deserialized JSON object.
	* @param document Document on which this operation will be applied.
	*/
	static override fromJSON(json: any, document: ModelDocument): RootAttributeOperation;
}