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

// 19.1.2.7 / 15.2.3.4 Object.getOwnPropertyNames(O)
var $keys      = require('./_object-keys-internal')
  , hiddenKeys = require('./_enum-bug-keys').concat('length', 'prototype');

exports.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O){
  return $keys(O, hiddenKeys);
};