/**
 * Masking middleware for logging pipeline
 * Applies sensitive data masking to log entries before they reach writers/transports
 */
import { MaskingConfig } from "../utils/maskSensitive";
/**
 * Log entry structure that gets processed by the middleware
 */
export interface LogEntry {
    level: string;
    message: string;
    timestamp: string;
    data?: any;
    meta?: any;
    [key: string]: any;
}
/**
 * Masking middleware function
 * @param entry - The log entry to process
 * @param config - Masking configuration
 * @returns The masked log entry
 */
export declare function maskLogEntry(entry: LogEntry, config?: MaskingConfig): LogEntry;
/**
 * Creates a masking middleware function with the given configuration
 * @param config - Masking configuration
 * @returns A middleware function that can be used in the logging pipeline
 */
export declare function createMaskingMiddleware(config?: MaskingConfig): (entry: LogEntry) => LogEntry;
/**
 * Batch masking for multiple log entries
 * @param entries - Array of log entries to mask
 * @param config - Masking configuration
 * @returns Array of masked log entries
 */
export declare function maskLogEntries(entries: LogEntry[], config?: MaskingConfig): LogEntry[];