/**
 * Serialize / parse / validate — structural integrity + acyclicity. Pure TS.
 *
 * Default-DENY: parseLayout throws on any tree validateTree would flag.
 */
import type { LayoutTree } from './types.js';
export declare function serializeLayout(t: LayoutTree): string;
export declare function validateTree(t: LayoutTree, knownPanelIds: ReadonlySet<string>): string[];
export declare function parseLayout(json: string): LayoutTree;
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