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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. 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 you can require() on every Node.js version, including 18 and older, is 4.1.0, published Mar 7, 2021.

On Node.js 20.19+, 22.12+ and every newer release, require("unist-util-is") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

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✓ works✓ works

How to import unist-util-is

ES modules (import)

import unistUtilIs from "unist-util-is";

CommonJS (require)

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

// Any Node.js version:
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 (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 you can require() on every Node.js version, including 18 and older, 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?

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