export function config(config: any, levels: any): {
    level: any;
    stack: boolean;
    logger: any;
    log: (level: any, msg: any, req: any, context: any, custom: any) => any;
    format: (info: any, req: any, res: any) => any;
    access: string | boolean;
    detail: boolean;
    sampling: false | {
        defaults: {
            target: any;
            rate: any;
            period: any;
            level: any;
        } & {
            default: boolean;
        };
        rules: any;
        rulesMap: {};
    };
    errorLogging: boolean;
};
export function sampler(app: any, req: any): boolean;