/**
 * Logger interface for ABAC Engine
 *
 * This interface allows for pluggable logging implementations.
 * Users can provide their own logger (Winston, Pino, Bunyan, etc.)
 * or use the default console-based logger.
 */
export interface ILogger {
    /**
     * Log debug messages
     */
    debug(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log informational messages
     */
    info(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log warning messages
     */
    warn(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log error messages
     */
    error(message: string, error?: Error | unknown, meta?: Record<string, unknown>): void;
}
/**
 * Log levels for filtering
 */
export declare enum LogLevel {
    Debug = 0,
    Info = 1,
    Warn = 2,
    Error = 3,
    None = 4
}
/**
 * Default console-based logger implementation
 *
 * This logger outputs to console and can be filtered by log level.
 * For production use, consider using a more robust logging library.
 */
export declare class ConsoleLogger implements ILogger {
    private readonly minLevel;
    constructor(minLevel?: LogLevel);
    debug(message: string, meta?: Record<string, unknown>): void;
    info(message: string, meta?: Record<string, unknown>): void;
    warn(message: string, meta?: Record<string, unknown>): void;
    error(message: string, error?: Error | unknown, meta?: Record<string, unknown>): void;
}
/**
 * Silent logger that doesn't output anything
 * Useful for testing or when logging is not desired
 */
export declare class SilentLogger implements ILogger {
    debug(_message: string, _meta?: Record<string, unknown>): void;
    info(_message: string, _meta?: Record<string, unknown>): void;
    warn(_message: string, _meta?: Record<string, unknown>): void;
    error(_message: string, _error?: Error | unknown, _meta?: Record<string, unknown>): void;
}
/**
 * Create a logger instance based on environment
 *
 * @param level - Minimum log level to output
 * @returns Logger instance
 */
export declare function createLogger(level?: LogLevel): ILogger;
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