# object.assign

> ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim

Latest version **4.1.7** (published 2024-12-18) · MIT license · 0 weekly downloads

> **Native alternative:** Object.assign — Use native JavaScript (Node 4.0.0+) (https://developer.mozilla.orgGlobal_Objects/Object/assign)

## Install

```sh
npm install object.assign
pnpm add object.assign
yarn add object.assign
bun add object.assign
```

## Health

**Score 43/100 (D)** — status: stable.

Positive: has types package; no vulnerabilities; high quality score.

Warnings: low downloads; no esm support.

Negative: stale.

## Facts

| | |
|---|---|
| Version | 4.1.7 |
| Published | 2024-12-18 |
| First published | 2014-03-14 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/object.assign) |
| Module format | CommonJS |
| Node | >= 0.4 |
| Dependencies | 6 |
| Unpacked size | 76.5 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 106 |
| Author | Jordan Harband |
| Maintainers | ljharb |
| Keywords | Object.assign, assign, ES6, extend, $.extend, jQuery, _.extend, Underscore, es-shim API, polyfill, shim |

## Links

- npm: https://www.npmjs.com/package/object.assign
- Repository: https://github.com/ljharb/object.assign
- Homepage: https://github.com/ljharb/object.assign#readme
- Issues: https://github.com/ljharb/object.assign/issues
- Funding: https://github.com/sponsors/ljharb
- npm.io page: https://npm.io/package/object.assign

## Dependencies (6)

- [call-bind](https://npm.io/package/call-bind.md) ^1.0.8
- [call-bound](https://npm.io/package/call-bound.md) ^1.0.3
- [has-symbols](https://npm.io/package/has-symbols.md) ^1.1.0
- [object-keys](https://npm.io/package/object-keys.md) ^1.1.1
- [es-object-atoms](https://npm.io/package/es-object-atoms.md) ^1.0.0
- [define-properties](https://npm.io/package/define-properties.md) ^1.2.1

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## Recent versions

- 4.1.7 (latest) — 2024-12-18
- 4.1.6 — 2024-12-18
- 4.1.5 — 2023-11-30
- 4.1.4 — 2022-08-16
- 4.1.3 — 2022-08-06
- 4.1.2 — 2020-10-31
- 4.1.1 — 2020-09-11
- 4.1.0 — 2017-12-21
- 4.0.4 — 2016-07-04
- 4.0.3 — 2015-10-21
- 4.0.2 — 2015-10-21
- 4.0.1 — 2015-08-16
- 4.0.0 — 2015-08-16
- 3.0.1 — 2015-06-28
- 2.0.3 — 2015-06-28
- … 18 more at https://npm.io/package/object.assign/versions

## README

# object.assign <sup>[![Version Badge][npm-version-svg]][npm-url]</sup>

[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![dependency status][deps-svg]][deps-url]
[![dev dependency status][dev-deps-svg]][dev-deps-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][npm-badge-png]][npm-url]

An Object.assign shim. Invoke its "shim" method to shim Object.assign if it is unavailable.

This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](http://www.ecma-international.org/ecma-262/6.0/#sec-object.assign). In an ES6 environment, it will also work properly with `Symbol`s.

Takes a minimum of 2 arguments: `target` and `source`.
Takes a variable sized list of source arguments - at least 1, as many as you want.
Throws a TypeError if the `target` argument is `null` or `undefined`.

Most common usage:
```js
var assign = require('object.assign').getPolyfill(); // returns native method if compliant
	/* or */
var assign = require('object.assign/polyfill')(); // returns native method if compliant
```

## Example

```js
var assert = require('assert');

// Multiple sources!
var target = { a: true };
var source1 = { b: true };
var source2 = { c: true };
var sourceN = { n: true };

var expected = {
	a: true,
	b: true,
	c: true,
	n: true
};

assign(target, source1, source2, sourceN);
assert.deepEqual(target, expected); // AWESOME!
```

```js
var target = {
	a: true,
	b: true,
	c: true
};
var source1 = {
	c: false,
	d: false
};
var sourceN = {
	e: false
};

var assigned = assign(target, source1, sourceN);
assert.equal(target, assigned); // returns the target object
assert.deepEqual(assigned, {
	a: true,
	b: true,
	c: false,
	d: false,
	e: false
});
```

```js
/* when Object.assign is not present */
delete Object.assign;
var shimmedAssign = require('object.assign').shim();
	/* or */
var shimmedAssign = require('object.assign/shim')();

assert.equal(shimmedAssign, assign);

var target = {
	a: true,
	b: true,
	c: true
};
var source = {
	c: false,
	d: false,
	e: false
};

var assigned = assign(target, source);
assert.deepEqual(Object.assign(target, source), assign(target, source));
```

```js
/* when Object.assign is present */
var shimmedAssign = require('object.assign').shim();
assert.equal(shimmedAssign, Object.assign);

var target = {
	a: true,
	b: true,
	c: true
};
var source = {
	c: false,
	d: false,
	e: false
};

assert.deepEqual(Object.assign(target, source), assign(target, source));
```

## Tests
Simply clone the repo, `npm install`, and run `npm test`

[npm-url]: https://npmjs.org/package/object.assign
[npm-version-svg]: http://versionbadg.es/ljharb/object.assign.svg
[travis-svg]: https://travis-ci.org/ljharb/object.assign.svg
[travis-url]: https://travis-ci.org/ljharb/object.assign
[deps-svg]: https://david-dm.org/ljharb/object.assign.svg?theme=shields.io
[deps-url]: https://david-dm.org/ljharb/object.assign
[dev-deps-svg]: https://david-dm.org/ljharb/object.assign/dev-status.svg?theme=shields.io
[dev-deps-url]: https://david-dm.org/ljharb/object.assign#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/object.assign.png?downloads=true&stars=true
[license-image]: http://img.shields.io/npm/l/object.assign.svg
[license-url]: LICENSE
[downloads-image]: http://img.shields.io/npm/dm/object.assign.svg
[downloads-url]: http://npm-stat.com/charts.html?package=object.assign
[codecov-image]: https://codecov.io/gh/ljharb/object.assign/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/ljharb/object.assign/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/object.assign
[actions-url]: https://github.com/ljharb/object.assign/actions

---
_Source: https://npm.io/package/object.assign · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._