/**
 * Structured logger with log levels.
 */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export declare class Logger {
    private context;
    private level;
    constructor(context: string, level?: LogLevel);
    private shouldLog;
    private format;
    debug(message: string, data?: Record<string, unknown>): void;
    info(message: string, data?: Record<string, unknown>): void;
    warn(message: string, data?: Record<string, unknown>): void;
    error(message: string, data?: Record<string, unknown>): void;
    setLevel(level: LogLevel): void;
    child(context: string): Logger;
}
export declare const defaultLogger: Logger;
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