Function sleep

demo/chat/stream-replay.ts:9–24

(ms: number, signal?: AbortSignal)

}

function sleep(ms: number, signal?: AbortSignal): Promise<void> {
  if (ms <= 0) {
    return Promise.resolve();
  }
  return new Promise((resolve, reject) => {
    const timer = window.setTimeout(resolve, ms);
    signal?.addEventListener(
      "abort",
      () => {
        window.clearTimeout(timer);
        reject(new DOMException("Aborted", "AbortError"));
      },
      { once: true },
    );
  });
}

function nextChunkSize(text: string, index: number, chunkSize: number): number {
  if (chunkSize > 0) {