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Is nth-check ESM-only? Can you require() it?

Parses and compiles CSS nth-checks to highly optimized functions.

Last verified Sep 9, 2026 against nth-check@3.0.1. Markdown · JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.1.1

nth-check dropped its CommonJS build in 3.0.0 (March 2026). The last version with a plain require()-able CommonJS entry is 2.1.1, published May 23, 2022.

On Node.js 20.19+, 22.12+ and newer, require("nth-check") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Node.js 18 has no require(esm), and nth-check@3.0.1 declares Node.js >=20.19.0, so 18 is outside its supported range anyway.

nth-check@3.0.1 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("nth-check") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const nthCheck = await import("nth-check"). That works on every Node.js version the package supports (>=20.19.0).
  3. If you need a synchronous require() or run Node.js 18: npm install nth-check@2.1.1, the last CommonJS release (published May 23, 2022).
  4. nth-check@3.0.1 declares engines ">=20.19.0", so Node.js 18 is unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
3.0.1 (Mar 17, 2026)
Module format
ESM-only
Last CommonJS version
2.1.1
ESM-only since
3.0.0 (Mar 17, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
Weekly downloads
49.4M
License
BSD-2-Clause

Does nth-check@3.0.1 actually load? Runtime test results

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

Runtimerequire("nth-check")import "nth-check"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 nth-check

ES modules (import)

import * as nthCheck from "nth-check";

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

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const nthCheck = require("nth-check");

// Any Node.js version the package supports (>=20.19.0), from an async function:
async function main() {
  const nthCheck = await import("nth-check");
}

// Or pin the last CommonJS release:
// npm install nth-check@2.1.1

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 (9 versions; the newest 9 shown).

VersionsFormatFirst published
3.0.0 – 3.0.1ESM-onlyMar 17, 2026
2.1.0 – 2.1.1Dual (CommonJS + ESM)May 22, 2022
1.0.0 – 2.0.1CommonJSFeb 15, 2014

Frequently asked

Is nth-check ESM-only?

nth-check@3.0.1 is ESM-only. nth-check dropped its CommonJS build in 3.0.0 (March 2026). The last version with a plain require()-able CommonJS entry is 2.1.1, published May 23, 2022.

Which version of nth-check still supports CommonJS / require()?

2.1.1 is the last version of nth-check with a CommonJS build. Install it with "npm install nth-check@2.1.1". Every version from 3.0.0 on is ESM-only.

How do I use nth-check from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const nthCheck = await import("nth-check"). That works on every Node.js version the package supports (>=20.19.0). On Node.js 20.19+, 22.12+ and newer, require("nth-check") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin nth-check@2.1.1.

Does nth-check work in Bun?

Yes. import "nth-check" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does nth-check ship TypeScript types?

Yes. nth-check bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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