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Is define-properties ESM-only? Can you require() it?

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

Last verified Sep 9, 2026 against define-properties@1.2.1. JSON

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

define-properties ships CommonJS only. require("define-properties") works everywhere. import "define-properties" 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.

Latest
1.2.1 (Sep 13, 2023)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
@types/define-properties
Node engines
>= 0.4
Weekly downloads
90.7M
License
MIT

Does define-properties@1.2.1 actually load? Runtime test results

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

Runtimerequire("define-properties")import "define-properties"
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✓ works✓ works

How to import define-properties

ES modules (import)

import defineProperties from "define-properties";

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 defineProperties = require("define-properties");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (10 versions; the newest 10 shown).

VersionsFormatFirst published
1.0.0 – 1.2.1CommonJSJan 4, 2015

Frequently asked

Is define-properties ESM-only?

define-properties@1.2.1 is a CommonJS package. define-properties ships CommonJS only. require("define-properties") works everywhere. import "define-properties" 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 define-properties with ES module syntax?

Yes. import defineProperties from "define-properties" 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 define-properties work in Bun?

Yes. import "define-properties" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does define-properties ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/define-properties".

Links

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