import Logger from 'bunyan';
import type { Logger as WpLogger, LoggerFactory } from '@webpieces/core-util';
/**
 * BunyanFactoryBase - shared plumbing for the bunyan {@link LoggerFactory}
 * backends. Builds ONE underlying bunyan logger with the caller-chosen stream,
 * then hands out a cached {@link BunyanLogger} per name (each a bunyan child
 * carrying `loggerName`). Every logger reads the magic context DIRECTLY from
 * RequestContext (including the build `version`), so nothing is threaded through here. Subclasses
 * differ only in the stream they pass up (GCP vs local console).
 *
 * Per-logger names ride as `loggerName` on each child rather than `name`, because
 * bunyan REFUSES to let a child override `name` (`invalid options.name: child cannot
 * set logger name`).
 */
export declare abstract class BunyanFactoryBase implements LoggerFactory {
    private readonly base;
    private readonly loggers;
    protected constructor(streams: Logger.Stream[]);
    getLogger(name: string): WpLogger;
}