/**
 * Structured JSON logger for the gateway daemon.
 * Writes to stdout in foreground mode, or to a log file in daemon mode.
 */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export interface Logger {
    debug(message: string, extra?: Record<string, unknown>): void;
    info(message: string, extra?: Record<string, unknown>): void;
    warn(message: string, extra?: Record<string, unknown>): void;
    error(message: string, extra?: Record<string, unknown>): void;
    close(): void;
}
export interface LoggerOptions {
    /** Write to file instead of stdout/stderr */
    logFile?: string;
    /** Minimum log level (default: 'info') */
    level?: LogLevel;
}
export declare function createLogger(options?: LoggerOptions): Logger;
export declare function getDefaultLogPath(): string;
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