declare module fb {
    interface IPerformanceMonitorService {
        start(): void;
        stop(): void;
        reset(): void;
        fetch(): {
            Timings: {
                Details: {
                    mean: number;
                    variance: number;
                    deviation: number;
                };
                Count: number;
            };
            Watchers: number;
        };
        status(): string;
    }
}