# Is @jest/environment ESM-only? Can you require() it?

> @jest/environment@30.5.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Last verified Sep 9, 2026 against @jest/environment@30.5.1.

@jest/environment ships CommonJS only. require("@jest/environment") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "@jest/environment" 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("@jest/environment") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0.
2. From ES modules use the default import: import environment from "@jest/environment"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 30.5.1 (Sep 1, 2026)
- Module format: CommonJS
- Last CommonJS version: 30.5.1
- TypeScript types: bundled
- Node engines: ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0
- Weekly downloads: 53.0M
- License: MIT

## Runtime test results for @jest/environment@30.5.1

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

| Runtime | require("@jest/environment") | import "@jest/environment" |
|---|---|---|
| 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 @jest/environment

ES modules:

```js
import environment from "@jest/environment";
```

CommonJS:

```js
const environment = require("@jest/environment");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (95 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 27.1.0 – 30.5.1 | CommonJS | Aug 27, 2021 |

## Frequently asked

**Is @jest/environment ESM-only?**

@jest/environment@30.5.1 is a CommonJS package. @jest/environment ships CommonJS only. require("@jest/environment") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "@jest/environment" 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 @jest/environment with ES module syntax?**

Yes. import environment from "@jest/environment" 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 @jest/environment work in Bun?**

Yes. import "@jest/environment" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @jest/environment ship TypeScript types?**

Yes. @jest/environment bundles its own type declarations; no @types package is needed.

## Links

- [@jest/environment on npm](https://www.npmjs.com/package/@jest/environment)
- [Source repository](https://github.com/jestjs/jest)
- [HTML version](https://canirequire.com/package/@jest/environment/)
- [JSON version](https://canirequire.com/package/@jest/environment.json)

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