/**
 * Sanitizes sensitive values for logging by showing only a few visible characters
 * @param value The sensitive value to sanitize
 * @param visibleChars Number of characters to show before masking (default: 4)
 * @returns A sanitized string safe for logging
 */
export declare function sanitizeForLog(value: string, visibleChars?: number): string;
/**
 * Sanitizes error messages by removing sensitive credentials and tokens
 * @param error The error to sanitize
 * @returns A sanitized error message safe for logging
 */
export declare function sanitizeError(error: unknown): string;
/**
 * Sanitizes AWS credentials for logging
 * @param auth AWS auth object or null
 * @returns Sanitized string representation safe for logging
 */
export declare function sanitizeAWSAuth(auth: {
    AWS_ACCESS_KEY_ID?: string;
    AWS_SECRET_ACCESS_KEY?: string;
    AWS_REGION?: string;
} | null): string;
/**
 * Sanitizes an object by removing or masking sensitive fields
 * @param obj The object to sanitize
 * @param sensitiveFields Array of field names to mask
 * @returns A new sanitized object safe for logging
 */
export declare function sanitizeObject<T extends Record<string, unknown>>(obj: T, sensitiveFields?: string[]): Record<string, unknown>;