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node_modules/worker-timers-worker/src/helpers/timer.ts
import { ICallNotification } from '../interfaces';

const scheduledIntervalIdentifiers: Map<number, number> = new Map();
const scheduledTimeoutIdentifiers: Map<number, number> = new Map();

export const clearScheduledInterval = (timerId: number) => {
    const identifier = scheduledIntervalIdentifiers.get(timerId);

    if (identifier !== undefined) {
        clearTimeout(identifier);
        scheduledIntervalIdentifiers.delete(timerId);
    } else {
        throw new Error(`There is no interval scheduled with the given id "${timerId}".`);
    }
};

export const clearScheduledTimeout = (timerId: number) => {
    const identifier = scheduledTimeoutIdentifiers.get(timerId);

    if (identifier !== undefined) {
        clearTimeout(identifier);
        scheduledTimeoutIdentifiers.delete(timerId);
    } else {
        throw new Error(`There is no timeout scheduled with the given id "${timerId}".`);
    }
};

const computeDelayAndExpectedCallbackTime = (delay: number, nowInMainThread: number) => {
    let now: number;
    let remainingDelay: number;
    const nowInWorker = performance.now();
    const elapsed = Math.max(0, nowInWorker - nowInMainThread);

    now = nowInWorker;
    remainingDelay = delay - elapsed;

    const expected = now + remainingDelay;

    return { expected, remainingDelay };
};

const setTimeoutCallback = (identifiers: Map<number, number>, timerId: number, expected: number, timerType: string) => {
    const now = performance.now();

    if (now > expected) {
        postMessage(<ICallNotification>{ id: null, method: 'call', params: { timerId, timerType } });
    } else {
        identifiers.set(timerId, setTimeout(setTimeoutCallback, expected - now, identifiers, timerId, expected, timerType));
    }
};

export const scheduleInterval = (delay: number, timerId: number, nowInMainThread: number) => {
    const { expected, remainingDelay } = computeDelayAndExpectedCallbackTime(delay, nowInMainThread);

    scheduledIntervalIdentifiers.set(
        timerId,
        setTimeout(setTimeoutCallback, remainingDelay, scheduledIntervalIdentifiers, timerId, expected, 'interval')
    );
};

export const scheduleTimeout = (delay: number, timerId: number, nowInMainThread: number) => {
    const { expected, remainingDelay } = computeDelayAndExpectedCallbackTime(delay, nowInMainThread);

    scheduledTimeoutIdentifiers.set(
        timerId,
        setTimeout(setTimeoutCallback, remainingDelay, scheduledTimeoutIdentifiers, timerId, expected, 'timeout')
    );
};