fix URLSearchParams iterator .next that should be enumerable by the spec

https://webidl.spec.whatwg.org/#es-iterator-prototype-object

Author: zloirock

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Changelog
 ##### Unreleased
 - Fixed requirements of internal slots in `Observable` / `Subscription` / `SubscriptionObserver`, [#1017](https://github.com/zloirock/core-js/issues/1017)
+- Fixed `URLSearchParams` iterator `.next` that should be enumerable [by the spec](https://webidl.spec.whatwg.org/#es-iterator-prototype-object)
 - Added NodeJS 17.2 compat data mapping
 
 ##### 3.19.2 - 2021.11.29

packages/core-js/internals/create-iterator-constructor.js

@@ -7,9 +7,9 @@ var Iterators = require('../internals/iterators');
 
 var returnThis = function () { return this; };
 
-module.exports = function (IteratorConstructor, NAME, next) {
+module.exports = function (IteratorConstructor, NAME, next, ENUMERABLE_NEXT) {
   var TO_STRING_TAG = NAME + ' Iterator';
-  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(1, next) });
+  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(+!ENUMERABLE_NEXT, next) });
   setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);
   Iterators[TO_STRING_TAG] = returnThis;
   return IteratorConstructor;

packages/core-js/modules/web.url-search-params.js

@@ -117,7 +117,7 @@ var URLSearchParamsIterator = createIteratorConstructor(function Iterator(params
   if (!step.done) {
     step.value = kind === 'keys' ? entry.key : kind === 'values' ? entry.value : [entry.key, entry.value];
   } return step;
-});
+}, true);
 
 var URLSearchParamsState = function (init) {
   this.entries = [];

tests/pure/web.url-search-params.js

@@ -1,6 +1,9 @@
 import { DESCRIPTORS } from '../helpers/constants';
 import { createIterable } from '../helpers/helpers';
 
+import getPrototypeOf from 'core-js-pure/es/object/get-prototype-of';
+import getOwnPropertyDescriptor from 'core-js-pure/es/object/get-own-property-descriptor';
+
 import { Symbol, URL, URLSearchParams } from 'core-js-pure';
 
 QUnit.test('URLSearchParams', assert => {
@@ -684,6 +687,8 @@ QUnit.test('URLSearchParams#entries', assert => {
     result += key + value;
   }
   assert.same(result, 'a1c3');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().entries()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#keys', assert => {
@@ -725,6 +730,8 @@ QUnit.test('URLSearchParams#keys', assert => {
     result += key;
   }
   assert.same(result, 'ac');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().keys()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#values', assert => {
@@ -766,6 +773,8 @@ QUnit.test('URLSearchParams#values', assert => {
     result += key;
   }
   assert.same(result, '13');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().values()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#@@iterator', assert => {
@@ -813,4 +822,6 @@ QUnit.test('URLSearchParams#@@iterator', assert => {
     result += key + value;
   }
   assert.same(result, 'a1c3');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams()[Symbol.iterator]()), 'next').enumerable, 'enumerable .next');
 });

tests/tests/web.url-search-params.js

@@ -1,6 +1,8 @@
 import { DESCRIPTORS, NODE } from '../helpers/constants';
 import { createIterable } from '../helpers/helpers';
 
+const { getPrototypeOf, getOwnPropertyDescriptor } = Object;
+
 QUnit.test('URLSearchParams', assert => {
   assert.isFunction(URLSearchParams);
   assert.arity(URLSearchParams, 0);
@@ -703,6 +705,8 @@ QUnit.test('URLSearchParams#entries', assert => {
     result += key + value;
   }
   assert.same(result, 'a1c3');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().entries()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#keys', assert => {
@@ -746,6 +750,8 @@ QUnit.test('URLSearchParams#keys', assert => {
     result += key;
   }
   assert.same(result, 'ac');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().keys()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#values', assert => {
@@ -789,6 +795,8 @@ QUnit.test('URLSearchParams#values', assert => {
     result += key;
   }
   assert.same(result, '13');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams().values()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#@@iterator', assert => {
@@ -838,6 +846,8 @@ QUnit.test('URLSearchParams#@@iterator', assert => {
     result += key + value;
   }
   assert.same(result, 'a1c3');
+
+  assert.true(getOwnPropertyDescriptor(getPrototypeOf(new URLSearchParams()[Symbol.iterator]()), 'next').enumerable, 'enumerable .next');
 });
 
 QUnit.test('URLSearchParams#@@toStringTag', assert => {