export type MetricSummary = {
    count: number;
    avgDuration: number;
    totalDuration: number;
    lastDuration: number;
};
declare class PerformanceLogger {
    private metrics;
    private activeTimers;
    start(name: string, metadata?: Record<string, any>): void;
    end(name: string): number | null;
    getSummary(): Record<string, MetricSummary>;
    printSummary(): void;
    printBaseline(): void;
    clear(): void;
    time<T>(name: string, fn: () => T, metadata?: Record<string, any>): T;
    timeAsync<T>(name: string, fn: () => Promise<T>, metadata?: Record<string, any>): Promise<T>;
}
export declare const perfLogger: PerformanceLogger;
export { PerformanceLogger };