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

> universalify@2.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Make a callback- or promise-based function support both promises and callbacks.

Last verified Sep 9, 2026 against universalify@2.0.1.

universalify ships CommonJS only. require("universalify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 10.0.0. import "universalify" 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("universalify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 10.0.0.
2. From ES modules use the default import: import universalify from "universalify"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/universalify

## Facts

- Latest: 2.0.1 (Nov 1, 2023)
- Module format: CommonJS
- Last CommonJS version: 2.0.1
- TypeScript types: @types/universalify
- Node engines: >= 10.0.0
- Weekly downloads: 144.1M
- License: MIT

## Runtime test results for universalify@2.0.1

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

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

ES modules:

```js
import universalify from "universalify";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (8 versions; the newest 8 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.1 – 2.0.1 | CommonJS | Apr 8, 2017 |

## Frequently asked

**Is universalify ESM-only?**

universalify@2.0.1 is a CommonJS package. universalify ships CommonJS only. require("universalify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 10.0.0. import "universalify" 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 universalify with ES module syntax?**

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

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

**Does universalify ship TypeScript types?**

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

## Links

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

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