import type { ProductGraph } from './graph-types.js';
import { DiagnosticBag } from '../diagnostics/diagnostic.js';
export interface GraphValidationResult {
    readonly bag: DiagnosticBag;
}
/**
 * Validate graph-level invariants:
 * - All edge endpoints reference existing node IDs
 * - No self-referencing edges
 * - Product node references match actual modules
 * - Module containment consistency
 */
export declare function validateGraph(graph: ProductGraph): GraphValidationResult;
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