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

Returns true if a value is a plain object, array or function.

Last verified Sep 9, 2026 against is-extendable@1.0.1. JSON

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

is-extendable ships CommonJS only. require("is-extendable") works everywhere. import "is-extendable" 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
1.0.1 (Sep 11, 2017)
Module format
CommonJS
Last CommonJS version
1.0.1
TypeScript types
Bundled
Node engines
>=0.10.0
Weekly downloads
41.9M
License
MIT

Does is-extendable@1.0.1 actually load? Runtime test results

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

Runtimerequire("is-extendable")import "is-extendable"
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 is-extendable

ES modules (import)

import isExtendable from "is-extendable";

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 isExtendable = require("is-extendable");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (4 versions; the newest 4 shown).

VersionsFormatFirst published
0.1.0 – 1.0.1CommonJSJun 29, 2015

Frequently asked

Is is-extendable ESM-only?

is-extendable@1.0.1 is a CommonJS package. is-extendable ships CommonJS only. require("is-extendable") works everywhere. import "is-extendable" 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-extendable with ES module syntax?

Yes. import isExtendable from "is-extendable" 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-extendable work in Bun?

Yes. import "is-extendable" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-extendable ship TypeScript types?

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

Links

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