/**
 * Generates a unique referral code
 * @param length - Length of the code (default: 8)
 * @returns A random alphanumeric code
 */
export declare function generateReferralCode(length?: number): string;
/**
 * Generates a unique referral code with a prefix
 * @param prefix - Prefix for the code (e.g., "REF")
 * @param length - Length of the random part (default: 6)
 * @returns A code with prefix and random characters
 */
export declare function generateReferralCodeWithPrefix(prefix: string, length?: number): string;