import { format } from "winston";
/**
 * Safe string conversion - prevents RCE via log injection
 */
export declare function toSafeString(value: unknown): string;
/**
 * Sanitize sensitive data by replacing with hash
 */
export declare function sanitizeValue(value: unknown, fieldName?: string): unknown;
/**
 * Truncate long strings to prevent log bloat
 */
export declare function truncateString(str: string, maxLength?: number): string;
/**
 * JSON formatter with sanitization
 */
export declare const jsonFormatter: ReturnType<typeof format.combine>;
/**
 * Console formatter (human-readable)
 */
export declare const consoleFormatter: ReturnType<typeof format.combine>;