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

> type-is@2.1.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Infer the content-type of a request.

Last verified Sep 9, 2026 against type-is@2.1.0.

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

## Facts

- Latest: 2.1.0 (May 13, 2026)
- Module format: CommonJS
- Last CommonJS version: 2.1.0
- TypeScript types: @types/type-is
- Node engines: >= 18
- Weekly downloads: 130.9M
- License: MIT

## Runtime test results for type-is@2.1.0

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

| Runtime | require("type-is") | import "type-is" |
|---|---|---|
| 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 type-is

ES modules:

```js
import typeIs from "type-is";
```

CommonJS:

```js
const typeIs = require("type-is");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (40 versions; the newest 40 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 2.1.0 | CommonJS | Dec 28, 2013 |

## Frequently asked

**Is type-is ESM-only?**

type-is@2.1.0 is a CommonJS package. type-is ships CommonJS only. require("type-is") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18. import "type-is" 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 type-is with ES module syntax?**

Yes. import typeIs from "type-is" 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 type-is work in Bun?**

Yes. import "type-is" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does type-is ship TypeScript types?**

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

## Links

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

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