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

> core-js-compat@3.50.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

core-js compat

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

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.

## Facts

- 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

## Runtime test results for core-js-compat@3.50.0

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.

| Runtime | require("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:

```js
import coreJsCompat from "core-js-compat";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (140 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 3.22.5 – 3.50.0 | CommonJS | May 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

- [core-js-compat on npm](https://www.npmjs.com/package/core-js-compat)
- [Source repository](https://github.com/zloirock/core-js)
- [HTML version](https://canirequire.com/package/core-js-compat/)
- [JSON version](https://canirequire.com/package/core-js-compat.json)

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