/// <reference types="node" />
import Bunyan from 'bunyan';
import { Transform, TransformCallback, Writable } from 'stream';
import { Level } from './types';
export declare class GCPCloudLoggingTransformer extends Transform {
    constructor();
    _transform(chunk: any, encoding: string, callback: TransformCallback): void;
    /**
     * Format a bunyan record into a Stackdriver log entry.
     */
    private formatEntry;
    private formatHttpEntry;
}
export declare function createStream(level?: Level, out?: Writable): Bunyan.Stream;