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

The `util.is*` functions introduced in Node v0.12.

Last verified Sep 9, 2026 against core-util-is@1.0.3. JSON

CommonJS CommonJS — require() works on every Node.js version

core-util-is ships CommonJS only. require("core-util-is") works everywhere. import "core-util-is" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Latest
1.0.3 (Aug 31, 2021)
Module format
CommonJS
Last CommonJS version
1.0.3
TypeScript types
@types/core-util-is
Node engines
not declared
Weekly downloads
75.7M
License
MIT

Does core-util-is@1.0.3 actually load? Runtime test results

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

Runtimerequire("core-util-is")import "core-util-is"
Node.js 18✓ works✓ 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 core-util-is

ES modules (import)

import coreUtilIs from "core-util-is";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const coreUtilIs = require("core-util-is");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (4 versions; the newest 4 shown).

VersionsFormatFirst published
1.0.0 – 1.0.3CommonJSAug 26, 2013

Frequently asked

Is core-util-is ESM-only?

core-util-is@1.0.3 is a CommonJS package. core-util-is ships CommonJS only. require("core-util-is") works everywhere. import "core-util-is" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import core-util-is with ES module syntax?

Yes. import coreUtilIs from "core-util-is" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does core-util-is work in Bun?

Yes. import "core-util-is" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does core-util-is ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/core-util-is".

Links

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