export declare class Logger {
    private static readonly concreteLogger;
    static isLevelEnabled(level: string): boolean;
    static error(message: string, ...meta: any[]): Logger;
    static warn(message: string, ...meta: any[]): Logger;
    static info(message: string, ...meta: any[]): Logger;
    static debug(message: string, ...meta: any[]): Logger;
    static silly(message: string, ...meta: any[]): Logger;
}