/// <reference types="winston" />
import * as winston from "winston";
import { ServiceType, ServiceResult } from "./types";
/**
 * Trace the service by milliseconds
 * @class XTracer
 */
export default class XTracer {
    MS_PER_SECOND: number;
    NS_PER_SECOND: number;
    private _debug;
    private _logger;
    private _tracer;
    constructor(opts: {
        debug?: boolean;
        logger?: winston.Winston;
    });
    /**
     * Begin tracer
     * @param sid Service ID. Ex: XUser.User.SignUp
     */
    begin(sid: string): void;
    /**
     * Trace service stack
     * @param sid Service ID. Ex: XUser.User.SignUp
     * @param info Trace stack information
     */
    trace(sid: string, info: {
        sid: string;
        type: ServiceType;
        duration: number;
        params?: any[];
        sResult?: ServiceResult;
    }): void;
    /**
     * End tracer
     * @param sid Service ID. Ex: XUser.User.SignUp
     * @param sResult Service result
     */
    end(sid: string, sResult: ServiceResult): void;
    /**
     * Break current tracer
     * @param info Error information
     */
    error(sid: string, error: Error, extra: {
        [index: string]: any;
    }): void;
    /**
     * Convert [seconds, nanoseconds] to milliseconds
     * @param {Array<number>} hrtime Result of process.hrtime, with format [seconds, nanoseconds]
     * @returns {number} Milliseconds
     */
    toMilliseconds(hrtime: [number, number]): number;
}