export type ValidationResult = {
    valid: boolean;
    basic: boolean;
    strict: boolean;
    reason: string[];
    confidence?: number;
    normalized?: string;
};
/**
 * Validates US Social Security Number with basic and strict rules
 * @param input - Input string (may contain hyphens or spaces)
 * @returns Validation result with basic and strict validation levels
 */
export declare function validateSSN(input: string): ValidationResult;