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

Standard library

Last verified Sep 9, 2026 against core-js@3.50.0. JSON

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

core-js ships CommonJS only. require("core-js") works everywhere. import "core-js" 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
3.50.0 (Aug 5, 2026)
Module format
CommonJS
Last CommonJS version
3.50.0
TypeScript types
@types/core-js
Node engines
*
Weekly downloads
61.6M
License
MIT

Does core-js@3.50.0 actually load? Runtime test results

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

Runtimerequire("core-js")import "core-js"
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-js

ES modules (import)

import coreJs from "core-js";

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 coreJs = require("core-js");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (260 versions; the newest 60 shown).

VersionsFormatFirst published
3.22.5 – 3.50.0CommonJSMay 10, 2022

Frequently asked

Is core-js ESM-only?

core-js@3.50.0 is a CommonJS package. core-js ships CommonJS only. require("core-js") works everywhere. import "core-js" 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-js with ES module syntax?

Yes. import coreJs from "core-js" 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-js work in Bun?

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

Does core-js ship TypeScript types?

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

Links

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