MQTTX - ReferenceError：未定义 fetch

问：

我正在使用脚本部分编写一个小脚本。代码如下：MQTTXJavaScript

async function handlePayload(value, msgType, index) {
  const object = value
  const d = new Date();
  let time = d.getTime();
  const date = new Date(time);

  // Get the hours and minutes
  const hours = date.getUTCHours();
  const minutes = date.getUTCMinutes();
  const seconds = date.getUTCSeconds();
  const timeX = `${hours + 1}:${minutes}:${seconds}`;
  object.time = timeX
  object.message = "⚠️ Check out our new Raffle! ⚠️";

  const postData = {
    included_segments: ["Total Subscriptions"],
    app_id: ONES_APP_ID,
    contents: { en: "Something went wrong" },
    headings: { en: "❌ - Error" },
    data: { custom_data: "some_value" },
   android_channel_id: ANDROID_CHANNEL_ID,
   ios_sound: "alarm.wav"
  };

  if (msgType === "publish" && object.type === "error") {
      const response = await fetch(API_URL, {
        method: "POST",
        body: JSON.stringify(postData),
        headers: {
          "Authorization": REST_API_KEY,
          "Accept": "application/json",
          "Content-Type": "application/json",
        },
      });
  }

  return JSON.stringify(object);
}

整个脚本都可以工作，除了 ，甚至更好的是，不仅 不起作用，而且 & 不起作用。它们 3 都提供了如下错误。fetchfetchaxiosXMLHttpRequest

ReferenceError：<fetch |公理 |XMLHttpRequest> 未定义

我已经问过人们，但截至今天还没有回应，所以我在你们所有人之前来到这里寻求指导。或者，如果有任何其他方法。该调用在 中起作用。MQTTXPostman