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

Array#isArray for older browsers

Last verified Sep 9, 2026 against isarray@2.0.5. JSON

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

isarray ships CommonJS only. require("isarray") works everywhere. import "isarray" 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
2.0.5 (Jul 8, 2019)
Module format
CommonJS
Last CommonJS version
2.0.5
TypeScript types
@types/isarray
Node engines
not declared
Weekly downloads
174.9M
License
MIT

Does isarray@2.0.5 actually load? Runtime test results

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

Runtimerequire("isarray")import "isarray"
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 isarray

ES modules (import)

import isarray from "isarray";

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 isarray = require("isarray");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (9 versions; the newest 9 shown).

VersionsFormatFirst published
0.0.0 – 2.0.5CommonJSMay 22, 2013

Frequently asked

Is isarray ESM-only?

isarray@2.0.5 is a CommonJS package. isarray ships CommonJS only. require("isarray") works everywhere. import "isarray" 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 isarray with ES module syntax?

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

Yes. import "isarray" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does isarray ship TypeScript types?

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

Links

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