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Dir : ~/usr/share/nodejs/core-js/internals/

Edit File: iterator-create-proxy.js

'use strict';
var call = require('../internals/function-call');
var create = require('../internals/object-create');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var defineBuiltIns = require('../internals/define-built-ins');
var wellKnownSymbol = require('../internals/well-known-symbol');
var InternalStateModule = require('../internals/internal-state');
var getMethod = require('../internals/get-method');
var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
var createIterResultObject = require('../internals/create-iter-result-object');
var iteratorClose = require('../internals/iterator-close');

var ITERATOR_HELPER = 'IteratorHelper';
var WRAP_FOR_VALID_ITERATOR = 'WrapForValidIterator';
var setInternalState = InternalStateModule.set;

var TO_STRING_TAG = wellKnownSymbol('toStringTag');

var createIteratorProxyPrototype = function (IS_ITERATOR) {
  var ITERATOR_PROXY = IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER;

var getInternalState = InternalStateModule.getterFor(ITERATOR_PROXY);

if (!IS_ITERATOR) {
    createNonEnumerableProperty(IteratorProxyPrototype, TO_STRING_TAG, 'Iterator Helper');
  }

return IteratorProxyPrototype;
};

var IteratorHelperPrototype = createIteratorProxyPrototype(false);
var WrapForValidIteratorPrototype = createIteratorProxyPrototype(true);

module.exports = function (nextHandler, IS_ITERATOR) {
  var ITERATOR_PROXY = IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER;

var IteratorProxy = function Iterator(record, state) {
    if (state) {
      state.iterator = record.iterator;
      state.next = record.next;
    } else state = record;
    state.type = ITERATOR_PROXY;
    state.nextHandler = nextHandler;
    state.counter = 0;
    state.done = false;
    setInternalState(this, state);
  };

IteratorProxy.prototype = IS_ITERATOR ? WrapForValidIteratorPrototype : IteratorHelperPrototype;

return IteratorProxy;
};