/**
 * Logger — strukturalny logging z kontekstem.
 *
 * W prod wszystkie logi trafiają do telemetry sink'a, nie do console.
 * Każdy log ma correlationId (propagowany z kontekstu).
 */
import type { CorrelationId } from '../identity/index.js';
export type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';
export interface LogRecord {
    readonly level: LogLevel;
    readonly message: string;
    readonly at: number;
    readonly correlationId?: CorrelationId;
    readonly context?: Readonly<Record<string, unknown>>;
    readonly cause?: unknown;
}
export interface Logger {
    trace(message: string, context?: Record<string, unknown>): void;
    debug(message: string, context?: Record<string, unknown>): void;
    info(message: string, context?: Record<string, unknown>): void;
    warn(message: string, context?: Record<string, unknown>): void;
    error(message: string, context?: Record<string, unknown>, cause?: unknown): void;
    fatal(message: string, context?: Record<string, unknown>, cause?: unknown): void;
    /** Zwraca nowy Logger z doklejonym stałym kontekstem (np. widgetId). */
    child(context: Record<string, unknown>): Logger;
}
export declare const LOGGER: import("../index.js").EchelonToken<Logger>;
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