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

> thenify@3.3.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Promisify a callback-based function

Last verified Sep 9, 2026 against thenify@3.3.1.

thenify ships CommonJS only. require("thenify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "thenify" 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("thenify") 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 thenify from "thenify"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for thenify; declare the module yourself if you need them.

## Facts

- Latest: 3.3.1 (Jun 17, 2020)
- Module format: CommonJS
- Last CommonJS version: 3.3.1
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 48.1M
- License: MIT

## Runtime test results for thenify@3.3.1

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

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

ES modules:

```js
import thenify from "thenify";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (9 versions; the newest 9 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 3.3.1 | CommonJS | Aug 9, 2014 |

## Frequently asked

**Is thenify ESM-only?**

thenify@3.3.1 is a CommonJS package. thenify ships CommonJS only. require("thenify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "thenify" 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 thenify with ES module syntax?**

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

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

**Does thenify ship TypeScript types?**

No. thenify ships no type declarations and there is no @types package for it.

## Links

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

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