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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. JSON

ESM-only ESM-only since 5.0.0 — last CommonJS version is 4.6.0

@sindresorhus/is dropped its CommonJS build in 5.0.0 (June 2022). The last version you can require() on every Node.js version, including 18 and older, is 4.6.0, published Feb 27, 2022.

On Node.js 20.19+, 22.12+ and every newer release, require("@sindresorhus/is") works anyway: Node can load synchronous ES modules through require(). Verified on Node 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

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

Latest
8.1.0 (May 11, 2026)
Module format
ESM-only
Last CommonJS version
4.6.0
ESM-only since
5.0.0 (Jun 11, 2022)
TypeScript types
Bundled
Node engines
>=22
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✓ works✓ works

How to import @sindresorhus/is

ES modules (import)

import is from "@sindresorhus/is";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const is = require("@sindresorhus/is");

// Any Node.js version:
const is = await import("@sindresorhus/is");

// Or pin the last CommonJS release:
// 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 (63 versions; the newest 60 shown).

VersionsFormatFirst published
5.0.0 – 8.1.0ESM-onlyJun 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 5.0.0 (June 2022). The last version you can require() on every Node.js version, including 18 and older, is 4.6.0, published Feb 27, 2022.

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

4.6.0 is the last version of @sindresorhus/is with a CommonJS build. Install it with "npm install @sindresorhus/is@4.6.0". Every version from 5.0.0 on is ESM-only.

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

Use a dynamic import: const mod = await import("@sindresorhus/is"). On Node.js 20.19+, 22.12+ and newer, a plain require("@sindresorhus/is") also works for ESM packages that do not use top-level await. Alternatively pin @sindresorhus/is@4.6.0.

Does @sindresorhus/is work in Bun?

Yes. import "@sindresorhus/is" loaded successfully in Bun 1.4 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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