# Is codecov ESM-only? Can you require() it?

> codecov@3.8.3 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Uploading report to Codecov: https://codecov.io

Last verified Sep 9, 2026 against codecov@3.8.3.

codecov ships CommonJS only. require("codecov") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.0. import "codecov" 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.

**Deprecated:** https://about.codecov.io/blog/codecov-uploader-deprecation-plan/

## What to do

1. require("codecov") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.0.
2. From ES modules use the default import: import codecov from "codecov"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for codecov; declare the module yourself if you need them.
4. This package is deprecated: https://about.codecov.io/blog/codecov-uploader-deprecation-plan/

## Facts

- Latest: 3.8.3 (Jul 19, 2021)
- Module format: CommonJS
- Last CommonJS version: 3.8.3
- TypeScript types: none
- Node engines: >=4.0
- Weekly downloads: 367K
- License: MIT

## Runtime test results for codecov@3.8.3

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

| Runtime | require("codecov") | import "codecov" |
|---|---|---|
| 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 codecov

ES modules:

```js
import codecov from "codecov";
```

CommonJS:

```js
const codecov = require("codecov");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (32 versions; the newest 32 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 3.8.3 | CommonJS | Oct 16, 2015 |

## Frequently asked

**Is codecov ESM-only?**

codecov@3.8.3 is a CommonJS package. codecov ships CommonJS only. require("codecov") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.0. import "codecov" 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 codecov with ES module syntax?**

Yes. import codecov from "codecov" 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 codecov work in Bun?**

Yes. import "codecov" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does codecov ship TypeScript types?**

No. codecov ships no type declarations and there is no @types package for it.

## Links

- [codecov on npm](https://www.npmjs.com/package/codecov)
- [Source repository](https://github.com/codecov/codecov-node)
- [HTML version](https://canirequire.com/package/codecov/)
- [JSON version](https://canirequire.com/package/codecov.json)

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