data-provider-temporary/examples/node_modules/core-js/modules/_an-instance.js

Library that helps with server-to-client synchronization of data

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