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

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

Last verified Sep 9, 2026 against codecov@3.8.3. Markdown · JSON

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

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.

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/
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

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

Does codecov@3.8.3 actually load? Runtime test results

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

Runtimerequire("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 (import)

import codecov from "codecov";

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 codecov = require("codecov");

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 (32 versions; the newest 32 shown).

VersionsFormatFirst published
1.0.0 – 3.8.3CommonJSOct 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

Other commonjs packages

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