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Is @sindresorhus/is ESM-only? Can you require() it?

Type check values

Last verified Sep 9, 2026 against @sindresorhus/is@8.1.0. Markdown · JSON

ESM-only ESM-only since 5.0.1 — last CommonJS version is 4.6.0

@sindresorhus/is dropped its CommonJS build in 5.0.1 (June 2022). The last version with a plain require()-able CommonJS entry is 4.6.0, published Feb 27, 2022; it declares support for Node.js >=10.

On Node.js 22.12+ and newer (@sindresorhus/is@8.1.0 declares Node.js >=22), require("@sindresorhus/is") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Node.js 18 has no require(esm), and @sindresorhus/is@8.1.0 declares Node.js >=22, so 18 is outside its supported range anyway.

@sindresorhus/is@8.1.0 declares engines ">=22", so Node.js 18, 20 are outside its supported range regardless of module format.

What to do

  1. On Node.js 22.12+ and newer (@sindresorhus/is@8.1.0 declares Node.js >=22), require("@sindresorhus/is") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const is = await import("@sindresorhus/is"). That works on every Node.js version the package supports (>=22).
  3. If you need a synchronous require() or run Node.js 18: npm install @sindresorhus/is@4.6.0, the last CommonJS release (published Feb 27, 2022); it declares Node.js >=10.
  4. @sindresorhus/is@8.1.0 declares engines ">=22", so Node.js 18, 20 are unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
8.1.0 (May 11, 2026)
Module format
ESM-only
Last CommonJS version
4.6.0
ESM-only since
5.0.1 (Jun 11, 2022)
TypeScript types
Bundled
Node engines
>=22
Weekly downloads
45.3M
License
MIT

Does @sindresorhus/is@8.1.0 actually load? Runtime test results

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

Runtimerequire("@sindresorhus/is")import "@sindresorhus/is"
Node.js 18✗ failsERR_REQUIRE_ESM✗ failsSyntaxError
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 @sindresorhus/is

ES modules (import)

import * as is from "@sindresorhus/is";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 22.12+ and newer (verified):
const is = require("@sindresorhus/is");

// Any Node.js version the package supports (>=22), from an async function:
async function main() {
  const is = await import("@sindresorhus/is");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install @sindresorhus/is@4.6.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (63 versions; the newest 60 shown).

VersionsFormatFirst published
5.0.1 – 8.1.0ESM-onlyJun 11, 2022
5.0.0No JS entry pointJun 11, 2022
0.3.0 – 4.6.0CommonJSOct 11, 2017

Frequently asked

Is @sindresorhus/is ESM-only?

@sindresorhus/is@8.1.0 is ESM-only. @sindresorhus/is dropped its CommonJS build in 5.0.1 (June 2022). The last version with a plain require()-able CommonJS entry is 4.6.0, published Feb 27, 2022; it declares support for Node.js >=10.

Which version of @sindresorhus/is still supports CommonJS / require()?

4.6.0 is the last version of @sindresorhus/is with a CommonJS build; it declares Node.js >=10. Install it with "npm install @sindresorhus/is@4.6.0". Every version from 5.0.1 on is ESM-only.

How do I use @sindresorhus/is from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const is = await import("@sindresorhus/is"). That works on every Node.js version the package supports (>=22). On Node.js 22.12+ and newer (@sindresorhus/is@8.1.0 declares Node.js >=22), require("@sindresorhus/is") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Alternatively pin @sindresorhus/is@4.6.0 (declares Node.js >=10).

Does @sindresorhus/is work in Bun?

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

Does @sindresorhus/is ship TypeScript types?

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

Links

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