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

Immutable Data Collections

Last verified Sep 9, 2026 against immutable@5.1.9. JSON

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

immutable ships CommonJS only. require("immutable") works everywhere. import "immutable" 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
5.1.9 (Jun 29, 2026)
Module format
CommonJS
Last CommonJS version
5.1.9
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
37.2M
License
MIT

Does immutable@5.1.9 actually load? Runtime test results

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

Runtimerequire("immutable")import "immutable"
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 immutable

ES modules (import)

import immutable from "immutable";

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 immutable = require("immutable");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (100 versions; the newest 60 shown).

VersionsFormatFirst published
2.6.2 – 5.1.9CommonJSOct 28, 2014

Frequently asked

Is immutable ESM-only?

immutable@5.1.9 is a CommonJS package. immutable ships CommonJS only. require("immutable") works everywhere. import "immutable" 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 immutable with ES module syntax?

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

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

Does immutable ship TypeScript types?

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

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