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Is array-flatten ESM-only? Can you require() it?

Flatten nested arrays

Last verified Sep 9, 2026 against array-flatten@3.0.0. JSON

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

array-flatten ships CommonJS only. require("array-flatten") works everywhere. import "array-flatten" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

Latest
3.0.0 (Nov 21, 2019)
Module format
CommonJS
Last CommonJS version
3.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
40.6M
License
MIT

Does array-flatten@3.0.0 actually load? Runtime test results

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

Runtimerequire("array-flatten")import "array-flatten"
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 array-flatten

ES modules (import)

import arrayFlatten from "array-flatten";

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 arrayFlatten = require("array-flatten");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (12 versions; the newest 12 shown).

VersionsFormatFirst published
0.0.2 – 3.0.0CommonJSMar 16, 2014

Frequently asked

Is array-flatten ESM-only?

array-flatten@3.0.0 is a CommonJS package. array-flatten ships CommonJS only. require("array-flatten") works everywhere. import "array-flatten" 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 array-flatten with ES module syntax?

Yes. import arrayFlatten from "array-flatten" 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 array-flatten work in Bun?

Yes. import "array-flatten" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does array-flatten ship TypeScript types?

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

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