/**
 * Log levels
 * @internal
 */
export declare enum LogLevel {
    DEBUG = "DEBUG",
    INFO = "INFO",
    WARN = "WARN",
    ERROR = "ERROR"
}
/**
 * Logger configuration
 * @internal
 */
export interface LoggerConfig {
    level: LogLevel;
    maskFields?: string[];
}
/**
 * Logger utility for safe logging
 * @internal
 */
export declare class Logger {
    private static config;
    /**
     * Configure the logger
     */
    static configure(config: Partial<LoggerConfig>): void;
    /**
     * Mask sensitive data in objects
     */
    private static maskSensitiveData;
    /**
     * Log a debug message
     */
    static debug(message: string, ...args: unknown[]): void;
    /**
     * Log an info message
     */
    static info(message: string, ...args: unknown[]): void;
    /**
     * Log a warning message
     */
    static warn(message: string, ...args: unknown[]): void;
    /**
     * Log an error message
     */
    static error(message: string, error?: Error, ...args: unknown[]): void;
    private static shouldLog;
}
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