import type Logger from 'bunyan';
import type { Logger as WpLogger } from '@webpieces/core-util';
/**
 * BunyanLogger - a webpieces {@link WpLogger} backed by a bunyan logger (one per
 * name, created as a bunyan child carrying `loggerName`). On every call it reads
 * the logged HeaderRegistry keys DIRECTLY from the active {@link RequestContext}
 * (secured values masked) into the bunyan fields object, and normalizes an optional
 * Error into `err: { name, message, stack }` — matching a production-tested AppLogger.
 * The GCP stream then serializes those fields into the structured log payload.
 *
 * This context-reading is INLINED here (and duplicated in the winston logger) on
 * purpose: it must run ONLY when a bunyan/winston backend is installed, never for
 * the plain ConsoleLogger — so it does not belong on RequestContext.
 */
export declare class BunyanLogger implements WpLogger {
    private readonly bunyan;
    constructor(bunyan: Logger);
    trace(message: string, err?: Error): void;
    debug(message: string, err?: Error): void;
    info(message: string, err?: Error): void;
    warn(message: string, err?: Error): void;
    error(message: string, err?: Error): void;
    private buildFields;
}