/**
 * Adds leading zeros to a number or string to reach a specified length,
 * while handling null/undefined values gracefully.
 * @param num
 * @param targetLength
 * @returns Type: string e.g., "5" → "05" or empty string if falsy
 */
export declare const padWithLeadingZeros: (num: number | string | null | undefined, targetLength?: number) => string;

export { }