/*! jsbt - MIT License (c) 2020 Paul Miller, 2010-2016 Mathias Bynens, John-David Dalton, Robert Kieffer from JSLitmus.js */
/**
 * Benchmark JS projects with nanosecond resolution.
 *
 * - Precise: 1ns resolution using `process.hrtime`
 * - Lightweight: ~200 lines of code, no dependencies - to not interfere with benchmarked code
 * - Readable: utilizes colors and nice units, shows rel. margin of error only if it's high
 *
 * @module
 */
export type BenchStats = {
    stats: {
        rme: number;
        min: bigint;
        max: bigint;
        mean: bigint;
        median: bigint;
        formatted: string;
    };
    perSecStr: string;
    perSec: bigint;
    perItemStr: string;
    measurements: bigint[];
};
export type CbFn = (iter?: number) => {};
declare function logMem(): void;
declare function formatDuration(duration: any): string;
declare function calcStats(list: bigint[]): {
    rme: number;
    min: bigint;
    max: bigint;
    mean: bigint;
    median: bigint;
    formatted: string;
};
declare const getTime: () => bigint;
declare function benchmarkRaw(callback: CbFn, maxRunTime?: bigint): Promise<BenchStats>;
export type BenchOpts = {
    /** Bytes processed by one benchmark iteration; printed as kib/mib/gib per second. */
    bytes?: number;
    /** Custom units processed by one benchmark iteration. */
    throughput?: BenchThroughput;
    /** Per-benchmark runtime in seconds. Defaults to 0.4. */
    maxRunTimeSec?: number;
    mode?: 'normal' | 'runOnce';
};
export type BenchThroughput = {
    amount: number;
    unit: string;
};
export declare function section(title?: string): void;
declare function setMaxRunTime(val: number): void;
export declare function bench(label: string, fn: CbFn, opts?: BenchOpts): Promise<BenchStats | undefined>;
export default bench;
export declare const utils: {
    getTime: typeof getTime;
    logMem: typeof logMem;
    setMaxRunTime: typeof setMaxRunTime;
    formatDuration: typeof formatDuration;
    calcStats: typeof calcStats;
    benchmarkRaw: typeof benchmarkRaw;
};