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

> reusify@1.1.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Reuse objects and functions with style

Last verified Sep 9, 2026 against reusify@1.1.0.

reusify ships CommonJS only. require("reusify") 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 "reusify" 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("reusify") 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 reusify from "reusify"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.1.0 (Feb 25, 2025)
- Module format: CommonJS
- Last CommonJS version: 1.1.0
- TypeScript types: bundled
- Node engines: >=0.10.0
- Weekly downloads: 91.0M
- License: MIT

## Runtime test results for reusify@1.1.0

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

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

ES modules:

```js
import reusify from "reusify";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (6 versions; the newest 6 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.1.0 | CommonJS | Sep 11, 2015 |

## Frequently asked

**Is reusify ESM-only?**

reusify@1.1.0 is a CommonJS package. reusify ships CommonJS only. require("reusify") 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 "reusify" 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 reusify with ES module syntax?**

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

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

**Does reusify ship TypeScript types?**

Yes. reusify bundles its own type declarations; no @types package is needed.

## Links

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

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