Function useNow

cli/src/hooks/use-now.ts:12–20

(intervalMs: number, enabled = true)

 * elapsed-in-queue display.
 */
export function useNow(intervalMs: number, enabled = true): number {
  const [now, setNow] = useState(() => Date.now())
  useEffect(() => {
    if (!enabled) return
    const id = setInterval(() => setNow(Date.now()), intervalMs)
    return () => clearInterval(id)
  }, [intervalMs, enabled])
  return now
}