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Is is-descriptor ESM-only? Can you require() it?

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

Last verified Sep 9, 2026 against is-descriptor@3.1.2. Markdown · JSON

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

is-descriptor ships CommonJS only. require("is-descriptor") 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 "is-descriptor" 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("is-descriptor") 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 isDescriptor from "is-descriptor"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for is-descriptor; declare the module yourself if you need them.
Latest
3.1.2 (May 11, 2026)
Module format
CommonJS
Last CommonJS version
3.1.2
TypeScript types
None
Node engines
>= 0.4
Weekly downloads
36.4M
License
MIT

Does is-descriptor@3.1.2 actually load? Runtime test results

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

Runtimerequire("is-descriptor")import "is-descriptor"
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 is-descriptor

ES modules (import)

import isDescriptor from "is-descriptor";

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 isDescriptor = require("is-descriptor");

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 (18 versions; the newest 18 shown).

VersionsFormatFirst published
0.1.0 – 3.1.2CommonJSAug 31, 2015

Frequently asked

Is is-descriptor ESM-only?

is-descriptor@3.1.2 is a CommonJS package. is-descriptor ships CommonJS only. require("is-descriptor") 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 "is-descriptor" 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 is-descriptor with ES module syntax?

Yes. import isDescriptor from "is-descriptor" 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 is-descriptor work in Bun?

Yes. import "is-descriptor" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does is-descriptor ship TypeScript types?

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

Links

Other commonjs packages

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