export interface SensitiveDataMaskingOptions {
    sensitiveFields: string[];
    customPatterns?: RegExp[];
    maskCharacter?: string;
    preserveLength?: boolean;
    showFirst?: number;
    showLast?: number;
}
export declare function maskSensitiveData(data: any, options: SensitiveDataMaskingOptions): any;
export declare function maskUrlParameters(url: string, sensitiveParams: string[]): string;
export declare function maskCreditCard(cardNumber: string): string;
export declare function maskEmail(email: string): string;