/**
 * Logging utilities for NeuBird MCP Server
 *
 * Important: In MCP servers, we use stderr for debug/log messages
 * and stdout is reserved for MCP protocol communication only.
 */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
/**
 * Logger class for structured logging to stderr
 */
declare class Logger {
    private enabled;
    private minLevel;
    constructor();
    private shouldLog;
    private formatMessage;
    /**
     * Log debug message (lowest priority)
     */
    debug(message: string, data?: any): void;
    /**
     * Log informational message
     */
    info(message: string, data?: any): void;
    /**
     * Log warning message
     */
    warn(message: string, data?: any): void;
    /**
     * Log error message (highest priority)
     */
    error(message: string, error?: Error | any): void;
}
export declare const logger: Logger;
export {};