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

Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Last verified Sep 9, 2026 against is-map@2.0.3. Markdown · JSON

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

is-map ships CommonJS only. require("is-map") 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-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.

What to do

  1. require("is-map") 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 isMap from "is-map"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
2.0.3 (Mar 8, 2024)
Module format
CommonJS
Last CommonJS version
2.0.3
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
43.4M
License
MIT

Does is-map@2.0.3 actually load? Runtime test results

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

Runtimerequire("is-map")import "is-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 1.4.0✓ works✓ works

How to import is-map

ES modules (import)

import isMap from "is-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 isMap = require("is-map");

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 (6 versions; the newest 6 shown).

VersionsFormatFirst published
1.0.0 – 2.0.3CommonJSFeb 18, 2015

Frequently asked

Is is-map ESM-only?

is-map@2.0.3 is a CommonJS package. is-map ships CommonJS only. require("is-map") 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-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 is-map with ES module syntax?

Yes. import isMap from "is-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 is-map work in Bun?

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

Does is-map ship TypeScript types?

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

Links

Other commonjs packages

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