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

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

CommonJS CommonJS — require() works on every Node.js version

type-is ships CommonJS only. require("type-is") works everywhere. 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.

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

Does type-is@2.1.0 actually load? Runtime test results

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

Runtimerequire("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✓ works✓ works

How to import type-is

ES modules (import)

import typeIs from "type-is";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

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).

VersionsFormatFirst published
1.0.0 – 2.1.0CommonJSDec 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 everywhere. 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 on Sep 9, 2026.

Does type-is ship TypeScript types?

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

Links

Other commonjs packages

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