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

> levn@0.4.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible

Last verified Sep 9, 2026 against levn@0.4.1.

levn ships CommonJS only. require("levn") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "levn" 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("levn") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0.
2. From ES modules use the default import: import levn from "levn"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/levn

## Facts

- Latest: 0.4.1 (Apr 4, 2020)
- Module format: CommonJS
- Last CommonJS version: 0.4.1
- TypeScript types: @types/levn
- Node engines: >= 0.8.0
- Weekly downloads: 129.1M
- License: MIT

## Runtime test results for levn@0.4.1

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

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

ES modules:

```js
import levn from "levn";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (10 versions; the newest 10 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 0.4.1 | CommonJS | Oct 4, 2013 |

## Frequently asked

**Is levn ESM-only?**

levn@0.4.1 is a CommonJS package. levn ships CommonJS only. require("levn") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "levn" 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 levn with ES module syntax?**

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

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

**Does levn ship TypeScript types?**

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

## Links

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

---

For scripts and AI agents: any package is at https://canirequire.com/package/<name>/index.md (Markdown) or https://canirequire.com/package/<name>.json (JSON); the site index is https://canirequire.com/llms.txt. Fetch the URL directly; no search needed.