# Is utils-merge ESM-only? Can you require() it?

> utils-merge@1.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

merge() utility function

Last verified Sep 9, 2026 against utils-merge@1.0.1.

utils-merge ships CommonJS only. require("utils-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.0. import "utils-merge" 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("utils-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.0.
2. From ES modules use the default import: import utilsMerge from "utils-merge"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/utils-merge

## Facts

- Latest: 1.0.1 (Sep 20, 2017)
- Module format: CommonJS
- Last CommonJS version: 1.0.1
- TypeScript types: @types/utils-merge
- Node engines: >= 0.4.0
- Weekly downloads: 48.6M
- License: MIT

## Runtime test results for utils-merge@1.0.1

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

| Runtime | require("utils-merge") | import "utils-merge" |
|---|---|---|
| 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 utils-merge

ES modules:

```js
import utilsMerge from "utils-merge";
```

CommonJS:

```js
const utilsMerge = require("utils-merge");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (2 versions; the newest 2 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.0.1 | CommonJS | Jul 11, 2013 |

## Frequently asked

**Is utils-merge ESM-only?**

utils-merge@1.0.1 is a CommonJS package. utils-merge ships CommonJS only. require("utils-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.0. import "utils-merge" 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 utils-merge with ES module syntax?**

Yes. import utilsMerge from "utils-merge" 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 utils-merge work in Bun?**

Yes. import "utils-merge" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does utils-merge ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/utils-merge".

## Links

- [utils-merge on npm](https://www.npmjs.com/package/utils-merge)
- [Source repository](https://github.com/jaredhanson/utils-merge)
- [HTML version](https://canirequire.com/package/utils-merge/)
- [JSON version](https://canirequire.com/package/utils-merge.json)

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