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

> rewire@9.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Easy dependency injection for node.js unit testing

Last verified Sep 9, 2026 against rewire@9.0.1.

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

## Facts

- Latest: 9.0.1 (Aug 15, 2025)
- Module format: CommonJS
- Last CommonJS version: 9.0.1
- TypeScript types: @types/rewire
- Node engines: not declared
- Weekly downloads: 369K
- License: MIT

## Runtime test results for rewire@9.0.1

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

| Runtime | require("rewire") | import "rewire" |
|---|---|---|
| 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 rewire

ES modules:

```js
import rewire from "rewire";
```

CommonJS:

```js
const rewire = require("rewire");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (48 versions; the newest 48 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 9.0.1 | CommonJS | Jun 4, 2012 |

## Frequently asked

**Is rewire ESM-only?**

rewire@9.0.1 is a CommonJS package. rewire ships CommonJS only. require("rewire") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "rewire" 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 rewire with ES module syntax?**

Yes. import rewire from "rewire" 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 rewire work in Bun?**

Yes. import "rewire" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does rewire ship TypeScript types?**

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

## Links

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

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