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

core-js compat

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

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

core-js-compat ships CommonJS only. require("core-js-compat") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.4.0. import "core-js-compat" 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.

What to do

  1. require("core-js-compat") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.4.0.
  2. From ES modules use the default import: import coreJsCompat from "core-js-compat"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
3.50.0 (Aug 5, 2026)
Module format
CommonJS
Last CommonJS version
3.50.0
TypeScript types
Bundled
Node engines
>=6.4.0
Weekly downloads
46.1M
License
MIT

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

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

Runtimerequire("core-js-compat")import "core-js-compat"
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 1.4.0✓ works✓ works

How to import core-js-compat

ES modules (import)

import coreJsCompat from "core-js-compat";

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 coreJsCompat = require("core-js-compat");

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 (140 versions; the newest 60 shown).

VersionsFormatFirst published
3.22.5 – 3.50.0CommonJSMay 10, 2022

Frequently asked

Is core-js-compat ESM-only?

core-js-compat@3.50.0 is a CommonJS package. core-js-compat ships CommonJS only. require("core-js-compat") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.4.0. import "core-js-compat" 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-compat with ES module syntax?

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

Yes. import "core-js-compat" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does core-js-compat ship TypeScript types?

Yes. core-js-compat bundles its own type declarations; no @types package is needed.

Links

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