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

Brand checking of React Elements.

Last verified Sep 9, 2026 against react-is@19.2.8. JSON

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

react-is ships CommonJS only. require("react-is") works everywhere. import "react-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
19.2.8 (Jul 21, 2026)
Module format
CommonJS
Last CommonJS version
19.2.8
TypeScript types
@types/react-is
Node engines
not declared
Weekly downloads
316.1M
License
MIT

Does react-is@19.2.8 actually load? Runtime test results

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

Runtimerequire("react-is")import "react-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 react-is

ES modules (import)

import reactIs from "react-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 reactIs = require("react-is");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (66 versions; the newest 60 shown).

VersionsFormatFirst published
16.4.2 – 19.2.8CommonJSAug 1, 2018

Frequently asked

Is react-is ESM-only?

react-is@19.2.8 is a CommonJS package. react-is ships CommonJS only. require("react-is") works everywhere. import "react-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 react-is with ES module syntax?

Yes. import reactIs from "react-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 react-is work in Bun?

Yes. import "react-is" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does react-is ship TypeScript types?

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

Links

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