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

> webpack-merge@6.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Variant of merge that's useful for webpack configuration

Last verified Sep 9, 2026 against webpack-merge@6.0.1.

webpack-merge ships CommonJS only. require("webpack-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0. import "webpack-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("webpack-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0.
2. From ES modules use the default import: import webpackMerge from "webpack-merge"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 6.0.1 (Jul 2, 2024)
- Module format: CommonJS
- Last CommonJS version: 6.0.1
- TypeScript types: bundled
- Node engines: >=18.0.0
- Weekly downloads: 14.6M
- License: MIT

## Runtime test results for webpack-merge@6.0.1

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

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

ES modules:

```js
import webpackMerge from "webpack-merge";
```

CommonJS:

```js
const webpackMerge = require("webpack-merge");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (89 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.16.0 – 6.0.1 | CommonJS | Nov 14, 2016 |

## Frequently asked

**Is webpack-merge ESM-only?**

webpack-merge@6.0.1 is a CommonJS package. webpack-merge ships CommonJS only. require("webpack-merge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0. import "webpack-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 webpack-merge with ES module syntax?**

Yes. import webpackMerge from "webpack-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 webpack-merge work in Bun?**

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

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

Yes. webpack-merge bundles its own type declarations; no @types package is needed.

## Links

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

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