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move joint iteration to stage 3
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‎CHANGELOG.md‎

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# Changelog
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### Unreleased
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- [Joint iteration proposal](https://github.com/tc39/proposal-joint-iteration):
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- Built-ins:
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- `Iterator.zip`
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- `Iterator.zipKeyed`
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- Moved to stage 3, November 2025 TC39 meeting
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- Added `/actual/` namespace entries, unconditional forced replacement changed to feature detection
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- Fixed increasing `.size` in `URLSearchParams.prototype.append` polyfill in IE8-
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- Compat data improvements:
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- [`Map` upsert proposal](https://github.com/tc39/proposal-upsert) features marked as shipped in Safari 26.2

‎README.md‎

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@@ -169,12 +169,12 @@ structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
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- [`Math.sumPrecise`](#mathsumprecise)
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- [Stage 3 proposals](#stage-3-proposals)
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- [`Iterator` sequencing](#iterator-sequencing)
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- [Joint iteration](#joint-iteration)
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- [`Map` upsert](#map-upsert)
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- [`JSON.parse` source text access](#jsonparse-source-text-access)
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- [`Symbol.metadata` for decorators metadata proposal](#symbolmetadata-for-decorators-metadata-proposal)
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- [Stage 2.7 proposals](#stage-27-proposals)
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- [`Iterator` chunking](#iterator-chunking)
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- [Joint iteration](#joint-iteration)
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- [Stage 2 proposals](#stage-2-proposals)
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- [`AsyncIterator` helpers](#asynciterator-helpers)
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- [`Iterator.range`](#iteratorrange)
@@ -2707,6 +2707,57 @@ Iterator.concat([0, 1].values(), [2, 3], function * () {
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}()).toArray(); // => [0, 1, 2, 3, 4, 5]
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```
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##### [Joint iteration](https://github.com/tc39/proposal-joint-iteration)[⬆](#index)
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Modules [esnext.iterator.zip](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.iterator.zip.js), [esnext.iterator.zip-keyed](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.iterator.zip-keyed.js)
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```ts
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class Iterator {
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zip<T extends readonly Iterable<unknown>[]>(
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iterables: T,
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options?: {
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mode?: 'shortest' | 'longest' | 'strict';
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padding?: { [K in keyof T]?: T[K] extends Iterable<infer U> ? U : never };
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}
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): IterableIterator<{ [K in keyof T]: T[K] extends Iterable<infer U> ? U : never }>;
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zipKeyed<K extends PropertyKey, V extends Record<K, Iterable<unknown>>>(
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iterables: V,
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options?: {
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mode?: 'shortest' | 'longest' | 'strict';
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padding?: { [P in keyof V]?: V[P] extends Iterable<infer U> ? U : never };
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}
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): IterableIterator<{ [P in keyof V]: V[P] extends Iterable<infer U> ? U : never }>;
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}
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```
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[*CommonJS entry points:*](#commonjs-api)
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```
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core-js/proposals/joint-iteration
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core-js(-pure)/actual|full/iterator/zip
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core-js(-pure)/actual|full/iterator/zip-keyed
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```
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[*Example*](https://tinyurl.com/vutnf2nu):
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```js
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Iterator.zip([
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[0, 1, 2],
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[3, 4, 5],
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]).toArray(); // => [[0, 3], [1, 4], [2, 5]]
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Iterator.zipKeyed({
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a: [0, 1, 2],
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b: [3, 4, 5, 6],
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c: [7, 8, 9],
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}, {
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mode: 'longest',
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padding: { c: 10 },
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}).toArray();
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/*
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[
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{ a: 0, b: 3, c: 7 },
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{ a: 1, b: 4, c: 8 },
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{ a: 2, b: 5, c: 9 },
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{ a: undefined, b: 6, c: 10 },
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];
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*/
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```
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##### [`Map` upsert](https://github.com/thumbsupep/proposal-upsert)[⬆](#index)
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Modules [`esnext.map.get-or-insert`](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.map.get-or-insert.js), [`esnext.map.get-or-insert-computed`](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.map.get-or-insert-computed.js), [`esnext.weak-map.get-or-insert`](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.weak-map.get-or-insert.js) and [`esnext.weak-map.get-or-insert-computed`](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.weak-map.get-or-insert-computed.js)
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```ts
@@ -2835,57 +2886,6 @@ let windowsPartial = Array.from([0, 1].values().windows(3, 'allow-partial')); /
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let windowsFull = Array.from([0, 1].values().windows(3)); // []
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```
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##### [Joint iteration](https://github.com/tc39/proposal-joint-iteration)[⬆](#index)
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Modules [esnext.iterator.zip](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.iterator.zip.js), [esnext.iterator.zip-keyed](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.iterator.zip-keyed.js)
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```ts
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class Iterator {
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zip<T extends readonly Iterable<unknown>[]>(
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iterables: T,
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options?: {
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mode?: 'shortest' | 'longest' | 'strict';
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padding?: { [K in keyof T]?: T[K] extends Iterable<infer U> ? U : never };
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}
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): IterableIterator<{ [K in keyof T]: T[K] extends Iterable<infer U> ? U : never }>;
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zipKeyed<K extends PropertyKey, V extends Record<K, Iterable<unknown>>>(
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iterables: V,
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options?: {
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mode?: 'shortest' | 'longest' | 'strict';
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padding?: { [P in keyof V]?: V[P] extends Iterable<infer U> ? U : never };
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}
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): IterableIterator<{ [P in keyof V]: V[P] extends Iterable<infer U> ? U : never }>;
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}
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```
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[*CommonJS entry points:*](#commonjs-api)
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```
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core-js/proposals/joint-iteration
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core-js(-pure)/full/iterator/zip
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core-js(-pure)/full/iterator/zip-keyed
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```
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[*Example*](https://tinyurl.com/vutnf2nu):
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```js
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Iterator.zip([
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[0, 1, 2],
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[3, 4, 5],
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]).toArray(); // => [[0, 3], [1, 4], [2, 5]]
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Iterator.zipKeyed({
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a: [0, 1, 2],
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b: [3, 4, 5, 6],
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c: [7, 8, 9],
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}, {
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mode: 'longest',
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padding: { c: 10 },
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}).toArray();
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/*
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[
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{ a: 0, b: 3, c: 7 },
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{ a: 1, b: 4, c: 8 },
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{ a: 2, b: 5, c: 9 },
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{ a: undefined, b: 6, c: 10 },
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];
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*/
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```
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#### Stage 2 proposals[⬆](#index)
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[*CommonJS entry points:*](#commonjs-api)
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```

‎docs/web/docs/features/proposals/joint-iteration.md‎

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## [Entry points]({docs-version}/docs/usage#h-entry-points)
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```ts
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core-js/proposals/joint-iteration
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core-js(-pure)/full/iterator/zip
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core-js(-pure)/full/iterator/zip-keyed
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core-js(-pure)/actual|full/iterator/zip
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core-js(-pure)/actual|full/iterator/zip-keyed
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```
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## Example

‎docs/web/docs/menu.json‎

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"title": "Iterator sequencing",
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"url": "{docs-version}/docs/features/proposals/iterator-sequencing"
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},
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{
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"title": "Joint iteration",
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"url": "{docs-version}/docs/features/proposals/joint-iteration"
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},
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{
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"title": "Map upsert",
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"url": "{docs-version}/docs/features/proposals/map-upsert"
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{
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"title": "Stage 2.7 proposals",
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"children": [
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{
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"title": "Joint iteration",
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"url": "{docs-version}/docs/features/proposals/joint-iteration"
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},
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{
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"title": "Iterator chunking",
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"url": "{docs-version}/docs/features/proposals/iterator-chunking"

‎packages/core-js/actual/iterator/index.js‎

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'use strict';
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var parent = require('../../stable/iterator');
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require('../../modules/es.object.create');
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require('../../modules/es.promise');
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require('../../modules/esnext.iterator.constructor');
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require('../../modules/esnext.iterator.concat');
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require('../../modules/esnext.iterator.take');
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require('../../modules/esnext.iterator.to-array');
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require('../../modules/esnext.iterator.to-async');
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require('../../modules/esnext.iterator.zip');
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require('../../modules/esnext.iterator.zip-keyed');
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module.exports = parent;

‎packages/core-js/actual/iterator/zip-keyed.js‎

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'use strict';
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require('../../modules/es.array.iterator');
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require('../../modules/es.object.create');
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require('../../modules/es.object.to-string');
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require('../../modules/es.string.iterator');
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require('../../modules/es.iterator.constructor');
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require('../../modules/es.iterator.drop');
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require('../../modules/es.iterator.every');
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require('../../modules/es.iterator.filter');
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require('../../modules/es.iterator.find');
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require('../../modules/es.iterator.flat-map');
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require('../../modules/es.iterator.for-each');
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require('../../modules/es.iterator.map');
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require('../../modules/es.iterator.reduce');
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require('../../modules/es.iterator.some');
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require('../../modules/es.iterator.take');
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require('../../modules/es.iterator.to-array');
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require('../../modules/es.reflect.own-keys');
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require('../../modules/esnext.iterator.zip-keyed');
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require('../../modules/web.dom-collections.iterator');
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var entryUnbind = require('../../internals/entry-unbind');
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module.exports = entryUnbind('Iterator', 'zipKeyed');

‎packages/core-js/actual/iterator/zip.js‎

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'use strict';
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require('../../modules/es.array.iterator');
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require('../../modules/es.object.to-string');
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require('../../modules/es.string.iterator');
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require('../../modules/es.iterator.constructor');
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require('../../modules/es.iterator.drop');
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require('../../modules/es.iterator.every');
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require('../../modules/es.iterator.filter');
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require('../../modules/es.iterator.find');
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require('../../modules/es.iterator.flat-map');
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require('../../modules/es.iterator.for-each');
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require('../../modules/es.iterator.map');
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require('../../modules/es.iterator.reduce');
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require('../../modules/es.iterator.some');
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require('../../modules/es.iterator.take');
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require('../../modules/es.iterator.to-array');
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require('../../modules/esnext.iterator.zip');
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require('../../modules/web.dom-collections.iterator');
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var entryUnbind = require('../../internals/entry-unbind');
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module.exports = entryUnbind('Iterator', 'zip');

‎packages/core-js/full/iterator/index.js‎

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var parent = require('../../actual/iterator');
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require('../../modules/esnext.iterator.chunks');
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require('../../modules/esnext.iterator.range');
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require('../../modules/esnext.iterator.sliding');
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require('../../modules/esnext.iterator.windows');
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require('../../modules/esnext.iterator.zip');
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require('../../modules/esnext.iterator.zip-keyed');
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// TODO: Remove from `core-js@4`
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require('../../modules/esnext.iterator.as-indexed-pairs');
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require('../../modules/esnext.iterator.indexed');
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require('../../modules/esnext.iterator.sliding');
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module.exports = parent;

‎packages/core-js/full/iterator/zip-keyed.js‎

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'use strict';
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require('../../modules/es.array.iterator');
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require('../../modules/es.object.create');
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require('../../modules/es.object.to-string');
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require('../../modules/es.string.iterator');
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require('../../modules/es.iterator.constructor');
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require('../../modules/es.iterator.drop');
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require('../../modules/es.iterator.every');
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require('../../modules/es.iterator.filter');
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require('../../modules/es.iterator.find');
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require('../../modules/es.iterator.flat-map');
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require('../../modules/es.iterator.for-each');
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require('../../modules/es.iterator.map');
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require('../../modules/es.iterator.reduce');
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require('../../modules/es.iterator.some');
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require('../../modules/es.iterator.take');
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require('../../modules/es.iterator.to-array');
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require('../../modules/es.reflect.own-keys');
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var parent = require('../../actual/iterator/zip-keyed');
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require('../../modules/esnext.iterator.chunks');
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require('../../modules/esnext.iterator.sliding');
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require('../../modules/esnext.iterator.windows');
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require('../../modules/esnext.iterator.zip-keyed');
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require('../../modules/web.dom-collections.iterator');
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var entryUnbind = require('../../internals/entry-unbind');
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module.exports = entryUnbind('Iterator', 'zipKeyed');
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module.exports = parent;

‎packages/core-js/full/iterator/zip.js‎

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'use strict';
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require('../../modules/es.array.iterator');
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require('../../modules/es.object.to-string');
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require('../../modules/es.string.iterator');
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require('../../modules/es.iterator.constructor');
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require('../../modules/es.iterator.drop');
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require('../../modules/es.iterator.every');
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require('../../modules/es.iterator.filter');
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require('../../modules/es.iterator.find');
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require('../../modules/es.iterator.flat-map');
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require('../../modules/es.iterator.for-each');
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require('../../modules/es.iterator.map');
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require('../../modules/es.iterator.reduce');
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require('../../modules/es.iterator.some');
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require('../../modules/es.iterator.take');
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require('../../modules/es.iterator.to-array');
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var parent = require('../../actual/iterator/zip');
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require('../../modules/esnext.iterator.chunks');
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require('../../modules/esnext.iterator.sliding');
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require('../../modules/esnext.iterator.windows');
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require('../../modules/esnext.iterator.zip');
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require('../../modules/web.dom-collections.iterator');
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var entryUnbind = require('../../internals/entry-unbind');
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module.exports = entryUnbind('Iterator', 'zip');
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module.exports = parent;

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