Function useTimer

src/useTimer.ts:22–86

({
  expiryTimestamp: expiry,
  onExpire = () => {},
  autoStart = true,
  interval: customInterval = SECOND_INTERVAL,
}: useTimerSettingsType)

};

export default function useTimer({
  expiryTimestamp: expiry,
  onExpire = () => {},
  autoStart = true,
  interval: customInterval = SECOND_INTERVAL,
}: useTimerSettingsType): useTimerResultType {
  const [expiryTimestamp, setExpiryTimestamp] = useState(expiry);
  const [milliseconds, setMilliseconds] = useState(Time.getMillisecondsFromExpiry(expiryTimestamp));
  const [isRunning, setIsRunning] = useState(autoStart);
  const [didStart, setDidStart] = useState(autoStart);
  const [interval, setInterval] = useState<number | null>(customInterval);

  const handleExpire = useCallback(() => {
    if (Validate.onExpire(onExpire)) {
      onExpire();
    }
    setIsRunning(false);
    setInterval(null);
  }, [onExpire]);

  const pause = useCallback(() => {
    setIsRunning(false);
  }, []);

  const restart = useCallback((newExpiryTimestamp: Date, newAutoStart = true) => {
    setInterval(customInterval);
    setDidStart(newAutoStart);
    setIsRunning(newAutoStart);
    setExpiryTimestamp(newExpiryTimestamp);
    setMilliseconds(Time.getMillisecondsFromExpiry(newExpiryTimestamp));
  }, [customInterval]);

  const resume = useCallback(() => {
    const time = new Date();
    time.setMilliseconds(time.getMilliseconds() + milliseconds);
    restart(time);
  }, [milliseconds, restart]);

  const start = useCallback(() => {
    if (didStart) {
      setMilliseconds(Time.getMillisecondsFromExpiry(expiryTimestamp));
      setIsRunning(true);
    } else {
      resume();
    }
  }, [expiryTimestamp, didStart, resume]);

  useInterval(() => {
    const millisecondsValue = Time.getMillisecondsFromExpiry(expiryTimestamp);
    setMilliseconds(millisecondsValue);
    if (millisecondsValue <= 0) {
      handleExpire();
    } else if (interval && millisecondsValue < interval) {
      setInterval(millisecondsValue);
    }
  }, isRunning ? interval : null);

  useEffect(() => {