export type SegmentResults = {
    time: number;
    heap: number;
    rss: number;
    mem: number;
};
type Aggregate = {
    min: number;
    max: number;
    avg: number;
    median: number;
};
export type SegmentAggregateResults = {
    iterations: number;
    time: Aggregate;
    heap: Aggregate;
    rss: Aggregate;
    mem: Aggregate;
};
type Segment = {
    time: HRTime;
    heap: number;
    rss: number;
    mem: number;
};
export type HRTime = [seconds: number, nanoseconds: number];
declare function startTime(): HRTime;
/**
 * @returns milliseconds since start
 */
declare function endTime(start: HRTime): number;
declare function startSegment(): Segment;
declare function endSegment(start: Segment): SegmentResults;
declare function renderSegment(segment: SegmentResults, title?: string, delimiter?: string): string;
declare function renderSegmentAggregate(segmentAggregate: SegmentAggregateResults, title?: string, delimiter?: string): string;
declare function withSegment(fn: () => Promise<void> | void): Promise<SegmentResults>;
declare function withSegmentIterations(warmupIterations: number, testIterations: number, fn: () => Promise<void> | void): Promise<SegmentAggregateResults>;
export declare const BenchUtils: {
    start: typeof startTime;
    end: typeof endTime;
    startSegment: typeof startSegment;
    endSegment: typeof endSegment;
    renderSegment: typeof renderSegment;
    renderSegmentAggregate: typeof renderSegmentAggregate;
    withSegment: typeof withSegment;
    withSegmentIterations: typeof withSegmentIterations;
};
export {};
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