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

Find and load configuration from a package.json property, rc file, TypeScript module, and more!

Last verified Sep 9, 2026 against cosmiconfig@10.0.1. Markdown · JSON

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

cosmiconfig ships CommonJS only. require("cosmiconfig") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^22.18 || >= 24. import "cosmiconfig" 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("cosmiconfig") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^22.18 || >= 24.
  2. From ES modules use the default import: import cosmiconfig from "cosmiconfig"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
10.0.1 (Aug 30, 2026)
Module format
CommonJS
Last CommonJS version
10.0.1
TypeScript types
Bundled
Node engines
^22.18 || >= 24
Weekly downloads
115.3M
License
MIT

Does cosmiconfig@10.0.1 actually load? Runtime test results

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

Runtimerequire("cosmiconfig")import "cosmiconfig"
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 cosmiconfig

ES modules (import)

import cosmiconfig from "cosmiconfig";

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 cosmiconfig = require("cosmiconfig");

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 (56 versions; the newest 56 shown).

VersionsFormatFirst published
0.1.0 – 10.0.1CommonJSNov 12, 2015

Frequently asked

Is cosmiconfig ESM-only?

cosmiconfig@10.0.1 is a CommonJS package. cosmiconfig ships CommonJS only. require("cosmiconfig") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^22.18 || >= 24. import "cosmiconfig" 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 cosmiconfig with ES module syntax?

Yes. import cosmiconfig from "cosmiconfig" 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 cosmiconfig work in Bun?

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

Does cosmiconfig ship TypeScript types?

Yes. cosmiconfig bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

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