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

> hasown@2.0.4 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A robust, ES3 compatible, "has own property" predicate.

Last verified Sep 9, 2026 against hasown@2.0.4.

hasown ships CommonJS only. require("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "hasown" 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("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.
2. From ES modules use the default import: import hasown from "hasown"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 2.0.4 (May 28, 2026)
- Module format: CommonJS
- Last CommonJS version: 2.0.4
- TypeScript types: bundled
- Node engines: >= 0.4
- Weekly downloads: 197.2M
- License: MIT

## Runtime test results for hasown@2.0.4

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

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

ES modules:

```js
import hasown from "hasown";
```

CommonJS:

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

## 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 |
|---|---|---|
| 1.0.1 – 2.0.4 | CommonJS | Sep 3, 2014 |

## Frequently asked

**Is hasown ESM-only?**

hasown@2.0.4 is a CommonJS package. hasown ships CommonJS only. require("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "hasown" 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 hasown with ES module syntax?**

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

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

**Does hasown ship TypeScript types?**

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

## Links

- [hasown on npm](https://www.npmjs.com/package/hasown)
- [Source repository](https://github.com/inspect-js/hasOwn)
- [HTML version](https://canirequire.com/package/hasown/)
- [JSON version](https://canirequire.com/package/hasown.json)

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