/**
 * @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 image/imagetextalternative/imagetextalternativecommand
 */
import { Command } from 'ckeditor5/src/core.js';
/**
 * The image text alternative command. It is used to change the `alt` attribute of `<imageBlock>` and `<imageInline>` model elements.
 */
export declare class ImageTextAlternativeCommand extends Command {
    /**
     * The command value: `false` if there is no `alt` attribute, otherwise the value of the `alt` attribute.
     *
     * @readonly
     * @observable
     */
    value: string | false;
    /**
     * @inheritDoc
     */
    refresh(): void;
    /**
     * Executes the command.
     *
     * @fires execute
     * @param options
     * @param options.newValue The new value of the `alt` attribute to set.
     */
    execute(options: {
        newValue: string;
    }): void;
}