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Is concat-map ESM-only? Can you require() it?

concatenative mapdashery

Last verified Sep 9, 2026 against concat-map@0.0.2. JSON

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

concat-map ships CommonJS only. require("concat-map") works everywhere. import "concat-map" 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
0.0.2 (Oct 12, 2022)
Module format
CommonJS
Last CommonJS version
0.0.2
TypeScript types
@types/concat-map
Node engines
not declared
Weekly downloads
80.0M
License
MIT

Does concat-map@0.0.2 actually load? Runtime test results

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

Runtimerequire("concat-map")import "concat-map"
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 concat-map

ES modules (import)

import concatMap from "concat-map";

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 concatMap = require("concat-map");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (3 versions; the newest 3 shown).

VersionsFormatFirst published
0.0.0 – 0.0.2CommonJSJun 8, 2012

Frequently asked

Is concat-map ESM-only?

concat-map@0.0.2 is a CommonJS package. concat-map ships CommonJS only. require("concat-map") works everywhere. import "concat-map" 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 concat-map with ES module syntax?

Yes. import concatMap from "concat-map" 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 concat-map work in Bun?

Yes. import "concat-map" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does concat-map ship TypeScript types?

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

Links

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