# Is extend-shallow ESM-only? Can you require() it?

> extend-shallow@3.0.2 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Extend an object with the properties of additional objects. node.js/javascript util.

Last verified Sep 9, 2026 against extend-shallow@3.0.2.

extend-shallow ships CommonJS only. require("extend-shallow") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "extend-shallow" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

## What to do

1. require("extend-shallow") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0.
2. From ES modules use the default import: import extendShallow from "extend-shallow"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for extend-shallow; declare the module yourself if you need them.

## Facts

- Latest: 3.0.2 (Dec 20, 2017)
- Module format: CommonJS
- Last CommonJS version: 3.0.2
- TypeScript types: none
- Node engines: >=0.10.0
- Weekly downloads: 61.3M
- License: MIT

## Runtime test results for extend-shallow@3.0.2

Installed and executed on Sep 9, 2026 with require("extend-shallow") from a CommonJS file and import "extend-shallow" from an ES module.

| Runtime | require("extend-shallow") | import "extend-shallow" |
|---|---|---|
| Node.js 18 | works | works |
| Node.js 20 | works | works |
| Node.js 22 | works | works |
| Node.js 24 | works | works |
| Node.js 26 | works | works |
| Bun 1.4.0 | works | works |

## How to import extend-shallow

ES modules:

```js
import extendShallow from "extend-shallow";
```

CommonJS:

```js
const extendShallow = require("extend-shallow");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (13 versions; the newest 13 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 3.0.2 | CommonJS | Oct 6, 2014 |

## Frequently asked

**Is extend-shallow ESM-only?**

extend-shallow@3.0.2 is a CommonJS package. extend-shallow ships CommonJS only. require("extend-shallow") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "extend-shallow" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

**Can I import extend-shallow with ES module syntax?**

Yes. import extendShallow from "extend-shallow" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

**Does extend-shallow work in Bun?**

Yes. import "extend-shallow" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does extend-shallow ship TypeScript types?**

No. extend-shallow ships no type declarations and there is no @types package for it.

## Links

- [extend-shallow on npm](https://www.npmjs.com/package/extend-shallow)
- [Source repository](https://github.com/jonschlinkert/extend-shallow)
- [HTML version](https://canirequire.com/package/extend-shallow/)
- [JSON version](https://canirequire.com/package/extend-shallow.json)

---

For scripts and AI agents: any package is at https://canirequire.com/package/<name>/index.md (Markdown) or https://canirequire.com/package/<name>.json (JSON); the site index is https://canirequire.com/llms.txt. Fetch the URL directly; no search needed.