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

Is this specifier a node.js core module?

Last verified Sep 9, 2026 against is-core-module@2.16.2. JSON

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

is-core-module ships CommonJS only. require("is-core-module") works everywhere. import "is-core-module" 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
2.16.2 (May 5, 2026)
Module format
CommonJS
Last CommonJS version
2.16.2
TypeScript types
@types/is-core-module
Node engines
>= 0.4
Weekly downloads
105.9M
License
MIT

Does is-core-module@2.16.2 actually load? Runtime test results

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

Runtimerequire("is-core-module")import "is-core-module"
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 is-core-module

ES modules (import)

import isCoreModule from "is-core-module";

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 isCoreModule = require("is-core-module");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (26 versions; the newest 26 shown).

VersionsFormatFirst published
1.0.0 – 2.16.2CommonJSSep 29, 2014

Frequently asked

Is is-core-module ESM-only?

is-core-module@2.16.2 is a CommonJS package. is-core-module ships CommonJS only. require("is-core-module") works everywhere. import "is-core-module" 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 is-core-module with ES module syntax?

Yes. import isCoreModule from "is-core-module" 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 is-core-module work in Bun?

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

Does is-core-module ship TypeScript types?

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

Links

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