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Is deep-equal ESM-only? Can you require() it?

node's assert.deepEqual algorithm

Last verified Sep 9, 2026 against deep-equal@2.2.3. Markdown · JSON

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

deep-equal ships CommonJS only. require("deep-equal") 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 "deep-equal" 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("deep-equal") 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 deepEqual from "deep-equal"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/deep-equal
Latest
2.2.3 (Nov 9, 2023)
Module format
CommonJS
Last CommonJS version
2.2.3
TypeScript types
@types/deep-equal
Node engines
>= 0.4
Weekly downloads
27.8M
License
MIT

Does deep-equal@2.2.3 actually load? Runtime test results

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

Runtimerequire("deep-equal")import "deep-equal"
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 deep-equal

ES modules (import)

import deepEqual from "deep-equal";

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 deepEqual = require("deep-equal");

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 (22 versions; the newest 22 shown).

VersionsFormatFirst published
0.0.0 – 2.2.3CommonJSFeb 11, 2012

Frequently asked

Is deep-equal ESM-only?

deep-equal@2.2.3 is a CommonJS package. deep-equal ships CommonJS only. require("deep-equal") 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 "deep-equal" 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 deep-equal with ES module syntax?

Yes. import deepEqual from "deep-equal" 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 deep-equal work in Bun?

Yes. import "deep-equal" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does deep-equal ship TypeScript types?

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

Links

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