core-js/internals/iterator-helper-throws-on-invalid-iterator.js

Standard library

'use strict';
// Should throw an error on invalid iterator
// https://issues.chromium.org/issues/336839115
module.exports = function (methodName, argument) {
  // eslint-disable-next-line es/no-iterator -- required for testing
  var method = typeof Iterator == 'function' && Iterator.prototype[methodName];
  if (method) try {
    method.call({ next: null }, argument).next();
  } catch (error) {
    return true;
  }
};