zater-cep/dist/node_modules/core-js/modules/_an-instance.js

ZAter cep correios e via cep

module.exports = function (it, Constructor, name, forbiddenField) {
  if (!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)) {
    throw TypeError(name + ': incorrect invocation!');
  } return it;
};