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

unist utility to check if a node passes a test

Last verified Sep 9, 2026 against unist-util-is@6.0.1. Markdown · JSON

ESM-only ESM-only since 5.0.0 — last CommonJS version is 4.1.0

unist-util-is dropped its CommonJS build in 5.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 4.1.0, published Mar 7, 2021.

On Node.js 20.19+, 22.12+ and newer, require("unist-util-is") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("unist-util-is") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("unist-util-is") 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 unistUtilIs = await import("unist-util-is"). That works on every Node.js version the package supports.
  3. If you need a synchronous require() or run Node.js 18: npm install unist-util-is@4.1.0, the last CommonJS release (published Mar 7, 2021).
  4. TypeScript: types are bundled; install nothing extra.
Latest
6.0.1 (Oct 16, 2025)
Module format
ESM-only
Last CommonJS version
4.1.0
ESM-only since
5.0.0 (Apr 19, 2021)
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
57.4M
License
MIT

Does unist-util-is@6.0.1 actually load? Runtime test results

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

Runtimerequire("unist-util-is")import "unist-util-is"
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 unist-util-is

ES modules (import)

import * as unistUtilIs from "unist-util-is";

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 unistUtilIs = require("unist-util-is");

// Any Node.js version the package supports, from an async function:
async function main() {
  const unistUtilIs = await import("unist-util-is");
}

// Or pin the last CommonJS release:
// npm install unist-util-is@4.1.0

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 (20 versions; the newest 20 shown).

VersionsFormatFirst published
5.0.0 – 6.0.1ESM-onlyApr 19, 2021
1.0.0 – 4.1.0CommonJSSep 2, 2015

Frequently asked

Is unist-util-is ESM-only?

unist-util-is@6.0.1 is ESM-only. unist-util-is dropped its CommonJS build in 5.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 4.1.0, published Mar 7, 2021.

Which version of unist-util-is still supports CommonJS / require()?

4.1.0 is the last version of unist-util-is with a CommonJS build. Install it with "npm install unist-util-is@4.1.0". Every version from 5.0.0 on is ESM-only.

How do I use unist-util-is from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const unistUtilIs = await import("unist-util-is"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("unist-util-is") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin unist-util-is@4.1.0.

Does unist-util-is work in Bun?

Yes. import "unist-util-is" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does unist-util-is ship TypeScript types?

Yes. unist-util-is bundles its own type declarations; no @types package is needed.

Links

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