@magnetarjs/utils-firestore/dist/Countdown.js

Magnetar utils firestore

/**
 * A countdown which can be restarted and resolves when the provided milliseconds have passed.
 *
 * @param {number} ms The amount of milliseconds to count down.
 * @returns {{done: Promise<void>, restart: (newDurationMs?: number) => void}} restart will reset the countdown and start counting down again.
 * @example
 * const countdown = Countdown(1000)
 * // set up what to do when it's finished:
 * countdown.done.then(() => doSomething())
 * // call this every time to restart the countdown:
 * countdown.restart()
 * @author Adam Dorling
 * @contact https://codepen.io/naito
 */
export function Countdown(ms) {
    let startTime = Date.now();
    let interval = null;
    let resolveTrigger = null;
    let duration = ms;
    const done = new Promise((resolve) => (resolveTrigger = resolve));
    function finish() {
        clearInterval(interval);
        interval = null;
        if (resolveTrigger) {
            resolveTrigger();
            resolveTrigger = null;
        }
    }
    function restart(newDurationMs) {
        if (typeof newDurationMs !== 'undefined') {
            duration = newDurationMs;
        }
        startTime = Date.now();
    }
    interval = setInterval(() => {
        const now = Date.now();
        const deltaT = now - startTime;
        if (deltaT >= duration)
            finish();
    }, 10);
    return { done, restart, forceFinish: finish };
}