export interface PerformanceObservedCounters {
    StartedAt: Date;
    FinishedAt?: Date;
    ElapsedTime: number;
    Name: string | symbol;
}
export declare class PerformanceCounter {
    private static timers;
    static start(id: string | symbol): PerformanceObservedCounters;
    static finish(id: string | symbol): PerformanceObservedCounters;
}