/**
* @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/attributeoperation
*/
import { Operation } from "./operation.js";
import { ModelRange } from "../range.js";
import { type ModelDocument } from "../document.js";
import type { ModelSelectable } from "../selection.js";
/**
* Operation to change nodes' attribute.
*
* Using this class you can add, remove or change value of the attribute.
*/
export declare class AttributeOperation extends Operation {
	/**
	* Range on which operation should be applied.
	*
	* @readonly
	*/
	range: ModelRange;
	/**
	* 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.
	*
	* If only `newValue` is set, attribute will be added on a node. Note that all nodes in operation's range must not
	* have an attribute with the same key as the added attribute.
	*
	* If only `oldValue` is set, then attribute with given key will be removed. Note that all nodes in operation's range
	* must have an attribute with that key added.
	*
	* If both `newValue` and `oldValue` are set, then the operation will change the attribute value. Note that all nodes in
	* operation's ranges must already have an attribute with given key and `oldValue` as value
	*
	* @param range Range on which the operation should be applied. Must be a flat range.
	* @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(range: ModelRange, key: string, oldValue: unknown, newValue: unknown, baseVersion: number | null);
	/**
	* @inheritDoc
	*/
	get type(): "addAttribute" | "removeAttribute" | "changeAttribute";
	/**
	* @inheritDoc
	*/
	get affectedSelectable(): ModelSelectable;
	/**
	* Creates and returns an operation that has the same parameters as this operation.
	*/
	clone(): AttributeOperation;
	/**
	* See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.
	*/
	getReversed(): Operation;
	/**
	* @inheritDoc
	*/
	override toJSON(): unknown;
	/**
	* @inheritDoc
	* @internal
	*/
	override _validate(): void;
	/**
	* @inheritDoc
	* @internal
	*/
	_execute(): void;
	/**
	* @inheritDoc
	*/
	static override get className(): string;
	/**
	* Creates `AttributeOperation` 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): AttributeOperation;
}