import { LayoutSourceIdentity } from '../../../../contracts/src/index.js';
/**
 * Stamp the editor-neutral layout-identity dataset (prep-001).
 *
 * Additive only — runs alongside legacy `data-pm-*` / `data-block-id` writes.
 * v1 consumers still read PM-shaped datasets; future editor-neutral consumers
 * read `data-layout-fragment-id` / `data-layout-story` / `data-layout-block-ref`.
 */
export declare function applyLayoutIdentityDataset(element: HTMLElement, identity: LayoutSourceIdentity | undefined): void;