/**
 * URL validation utilities
 */
/**
 * Validate and normalize a URL
 */
export declare function validateUrl(url: string): string;
/**
 * Format a timestamp for Wayback Machine API
 * Accepts: YYYY, YYYYMM, YYYYMMDD, or YYYYMMDDhhmmss
 */
export declare function formatTimestamp(timestamp?: string): string | undefined;
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