import type { CslCustom } from "../csl-json/types";
/**
 * Validate if a string is a valid UUID v4
 */
export declare function isValidUuid(uuid: string): boolean;
/**
 * Generate a new UUID v4
 */
export declare function generateUuid(): string;
/**
 * Generate a new ISO 8601 timestamp
 */
export declare function generateTimestamp(): string;
/**
 * Extract UUID from custom field
 */
export declare function extractUuidFromCustom(custom: CslCustom | undefined): string | null;
/**
 * Ensure custom metadata has valid UUID, created_at, and timestamp
 * Handles legacy migration from old timestamp-only format
 * Generates new values if missing or invalid
 */
export declare function ensureCustomMetadata(custom: CslCustom | undefined): CslCustom;
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