node_modules/core-js/modules/_object-gopn-ext.js

// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window
var toIObject = require('./_to-iobject');
var gOPN = require('./_object-gopn').f;
var toString = {}.toString;

var windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames
  ? Object.getOwnPropertyNames(window) : [];

var getWindowNames = function (it) {
  try {
    return gOPN(it);
  } catch (e) {
    return windowNames.slice();
  }
};

module.exports.f = function getOwnPropertyNames(it) {
  return windowNames && toString.call(it) == '[object Window]' ? getWindowNames(it) : gOPN(toIObject(it));
};