How to use the @babel/runtime-corejs3/core-js/date/now function in @babel/runtime-corejs3

init: function init(cb) {
    var _this = this;

    var OFFLINE_MILL = 15 * 60 * 1000; // 15分钟不操作认为不在线

    var SEND_MILL = 5 * 1000; // 每5s打点一次

    var lastTime = _Date$now();

    window.addEventListener('click', function () {
      if (_this.needRecordTimeOnPage === false) {
        _this.debugLogger("config.record.time_on_page\u503C\u4E3Afalse, \u8DF3\u8FC7\u505C\u7559\u65F6\u957F\u6253\u70B9");

        return;
      }

      var now = _Date$now();

      var duration = now - lastTime;

      if (duration > OFFLINE_MILL) {
        lastTime = _Date$now();
      } else if (duration > SEND_MILL) {
        lastTime = _Date$now();

window.addEventListener('click', function () {
      if (_this.needRecordTimeOnPage === false) {
        _this.debugLogger("config.record.time_on_page\u503C\u4E3Afalse, \u8DF3\u8FC7\u505C\u7559\u65F6\u957F\u6253\u70B9");

        return;
      }

      var now = _Date$now();

      var duration = now - lastTime;

      if (duration > OFFLINE_MILL) {
        lastTime = _Date$now();
      } else if (duration > SEND_MILL) {
        lastTime = _Date$now();

        _this.debugLogger('发送用户留存时间埋点, 埋点内容 => ', {
          duration_ms: duration
        }); // 用户在线时长


        cb && cb.call(_this, 10001, {
          duration_ms: duration
        });

function checkLoadFinsh() {
    var now = _Date$now();

    if (now > lastDomChangeTime + 300 && delayNum === 0 && effective) {
      // 没有元素在变化同时，没有操作
      // 这里就是所有得渲染都完成了，要开始计算首屏元素和时间了
      checkDomInfirstScreen(initDoms, reportCallback);
      observer.disconnect(); // 监听销毁
    } else if (effective) {
      _setTimeout(checkLoadFinsh, 300);
    }
  } // 监听全局得click和键盘输入事件

window.addEventListener('click', function () {
      if (_this.needRecordTimeOnPage === false) {
        _this.debugLogger("config.record.time_on_page\u503C\u4E3Afalse, \u8DF3\u8FC7\u505C\u7559\u65F6\u957F\u6253\u70B9");

        return;
      }

      var now = _Date$now();

      var duration = now - lastTime;

      if (duration > OFFLINE_MILL) {
        lastTime = _Date$now();
      } else if (duration > SEND_MILL) {
        lastTime = _Date$now();

        _this.debugLogger('发送用户留存时间埋点, 埋点内容 => ', {
          duration_ms: duration
        }); // 用户在线时长


        cb && cb.call(_this, 10001, {
          duration_ms: duration
        });
      }
    }, false);
  }

export default function initRenderingTime(reportCallback) {
  var initDoms = []; // 被加载得doms

  var delayNum = 0; // 等待加载得时间

  var effective = true; // 操作记录是否有效

  var lastDomChangeTime = _Date$now();

  var mutationCallback = function mutationCallback(mutationsList) {
    var now = _Date$now();

    lastDomChangeTime = now;
    var _iteratorNormalCompletion = true;
    var _didIteratorError = false;
    var _iteratorError = undefined;

    try {
      for (var _iterator = _getIterator(mutationsList), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
        var mutation = _step.value;
        var addedNodes = mutation.addedNodes;

        for (var i = 0; i < addedNodes.length; i++) {
          var addNode = addedNodes[i];

var mutationCallback = function mutationCallback(mutationsList) {
    var now = _Date$now();

    lastDomChangeTime = now;
    var _iteratorNormalCompletion = true;
    var _didIteratorError = false;
    var _iteratorError = undefined;

    try {
      for (var _iterator = _getIterator(mutationsList), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
        var mutation = _step.value;
        var addedNodes = mutation.addedNodes;

        for (var i = 0; i < addedNodes.length; i++) {
          var addNode = addedNodes[i];
          var domName = getClassName(addNode);

          if (/^HTML/.test(domName)) {

addNode.addEventListener('load', function () {
                  delayNum--;
                  item.time = _Date$now();
                }, false);
              }