/**
 * Validation utilities for common Nigerian/African fintech use cases
 */
/**
 * Validates Nigerian phone number
 * Accepts formats: 08012345678, +2348012345678, 2348012345678
 */
export declare const isValidNigerianPhone: (phone: string) => boolean;
/**
 * Validates email address
 */
export declare const isValidEmail: (email: string) => boolean;
/**
 * Validates Nigerian BVN (Bank Verification Number)
 * Must be exactly 11 digits
 */
export declare const isValidBVN: (bvn: string) => boolean;
/**
 * Validates Nigerian NIN (National Identification Number)
 * Must be exactly 11 digits
 */
export declare const isValidNIN: (nin: string) => boolean;
/**
 * Validates Nigerian account number
 * Must be exactly 10 digits (NUBAN format)
 */
export declare const isValidAccountNumber: (accountNumber: string) => boolean;
/**
 * Validates amount (must be positive number)
 */
export declare const isValidAmount: (amount: number) => boolean;
/**
 * Validates password strength
 * At least 8 characters, 1 uppercase, 1 lowercase, 1 number
 */
export declare const isStrongPassword: (password: string) => boolean;
/**
 * Validates referral code format
 * 6-10 alphanumeric characters
 */
export declare const isValidReferralCode: (code: string) => boolean;
/**
 * Validates transaction reference format
 */
export declare const isValidTransactionReference: (ref: string) => boolean;
/**
 * Sanitizes phone number to standard format
 * Converts to: 2348012345678
 */
export declare const sanitizePhoneNumber: (phone: string, withPlus?: boolean) => string;
/**
 * Validates date is not in the past
 */
export declare const isNotPastDate: (date: Date) => boolean;
/**
 * Validates date is within range
 */
export declare const isDateInRange: (date: Date, minDate: Date, maxDate: Date) => boolean;
/**
 * Validates age is above minimum (for KYC)
 */
export declare const isValidAge: (dateOfBirth: Date, minAge?: number) => boolean;