import { ClassicEditorSupportConfig } from './types/ClassicEditorSupportConfig';
/**
 * Builds the preview custom-element class scoped to one iframe's realm. Custom
 * elements must extend the HTMLElement of the realm whose registry defines them,
 * so the iframe's own HTMLElement is used as the base. The element renders the
 * widget's preview (in a shadow mount) and opens the config dialog on
 * double-click.
 * @param {Window} win - The iframe window whose realm the class belongs to.
 * @param {ClassicEditorSupportConfig} config - The widget's support config.
 * @returns {CustomElementConstructor} The realm-bound preview element class.
 */
export declare const createClassicPreviewElementClass: (win: Window, config: ClassicEditorSupportConfig) => CustomElementConstructor;
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