Function setArbitraryLengthTimeout

async/delay.ts:82–107

(
  callback: () => void,
  delay: number,
)

const I32_MAX = 2 ** 31 - 1;

function setArbitraryLengthTimeout(
  callback: () => void,
  delay: number,
): { valueOf(): number } {
  // ensure non-negative integer (but > I32_MAX is OK, even if Infinity)
  delay = Math.trunc(Math.max(delay, 0) || 0);

  if (delay <= I32_MAX) {
    const id = Number(setTimeout(callback, delay));
    return { valueOf: () => id };
  }

  const start = Date.now();
  let timeoutId: number;

  const queueTimeout = () => {
    const currentDelay = delay - (Date.now() - start);
    timeoutId = currentDelay > I32_MAX
      ? Number(setTimeout(queueTimeout, I32_MAX))
      : Number(setTimeout(callback, currentDelay));
  };

  queueTimeout();

  return { valueOf: () => timeoutId };
}