export type Microseconds = number;
export type Milliseconds = number;
/**
 * Defines clock utilities for time conversions.
 * Handles time origins in NodeJS and the Browser
 * Provides process and thread IDs.
 * @param init
 */
export type EpochClockOptions = {
    pid?: number;
    tid?: number;
};
/**
 * Creates epoch-based clock utility.
 * Epoch time has been the time since January 1, 1970 (UNIX epoch).
 * Date.now gives epoch time in milliseconds.
 * performance.now() + performance.timeOrigin when available is used for higher precision.
 */
export declare function epochClock(init?: EpochClockOptions): {
    timeOriginMs: number;
    pid: number;
    tid: number;
    epochNowUs: () => Microseconds;
    msToUs: (ms: number) => Microseconds;
    usToUs: (us: number) => Microseconds;
    fromEpochMs: (ms: number) => Microseconds;
    fromEpochUs: (us: number) => Microseconds;
    fromPerfMs: (perfMs: Milliseconds) => Microseconds;
    fromEntry: (entry: {
        startTime: Milliseconds;
        entryType: string;
        duration: Milliseconds;
    }, useEndTime?: boolean) => number;
    fromEntryStartTimeMs: (perfMs: Milliseconds) => Microseconds;
    fromDateNowMs: (ms: number) => Microseconds;
};
export declare const defaultClock: {
    timeOriginMs: number;
    pid: number;
    tid: number;
    epochNowUs: () => Microseconds;
    msToUs: (ms: number) => Microseconds;
    usToUs: (us: number) => Microseconds;
    fromEpochMs: (ms: number) => Microseconds;
    fromEpochUs: (us: number) => Microseconds;
    fromPerfMs: (perfMs: Milliseconds) => Microseconds;
    fromEntry: (entry: {
        startTime: Milliseconds;
        entryType: string;
        duration: Milliseconds;
    }, useEndTime?: boolean) => number;
    fromEntryStartTimeMs: (perfMs: Milliseconds) => Microseconds;
    fromDateNowMs: (ms: number) => Microseconds;
};