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

A robust, ES3 compatible, "has own property" predicate.

Last verified Sep 9, 2026 against hasown@2.0.4. Markdown · JSON

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

hasown ships CommonJS only. require("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "hasown" 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("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.
  2. From ES modules use the default import: import hasown from "hasown"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
2.0.4 (May 28, 2026)
Module format
CommonJS
Last CommonJS version
2.0.4
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
197.2M
License
MIT

Does hasown@2.0.4 actually load? Runtime test results

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

Runtimerequire("hasown")import "hasown"
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 hasown

ES modules (import)

import hasown from "hasown";

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 hasown = require("hasown");

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 (6 versions; the newest 6 shown).

VersionsFormatFirst published
1.0.1 – 2.0.4CommonJSSep 3, 2014

Frequently asked

Is hasown ESM-only?

hasown@2.0.4 is a CommonJS package. hasown ships CommonJS only. require("hasown") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "hasown" 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 hasown with ES module syntax?

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

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

Does hasown ship TypeScript types?

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

Links

Other commonjs packages

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