export interface MaskingConfig {
    enabled?: boolean;
    maskingChar?: string;
    preserveLength?: boolean;
    showLastChars?: number;
    customPatterns?: {
        [key: string]: RegExp;
    };
    customFields?: string[];
    exemptFields?: string[];
    maskEmails?: boolean;
    maskIPs?: boolean;
    maskConnectionStrings?: boolean;
}
/**
 * Mask sensitive data in API logs and other data
 * Enhanced with memory-safe processing for large datasets
 */
export declare function maskSensitiveData(data: any, config?: MaskingConfig): any;
/**
 * Create a masking configuration for different environments
 */
export declare function createMaskingConfig(environment: 'development' | 'staging' | 'production'): MaskingConfig;
/**
 * Validate masking configuration
 */
export declare function validateMaskingConfig(config: MaskingConfig): {
    isValid: boolean;
    errors: string[];
};