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

A library for deep (recursive) merging of Javascript objects

Last verified Sep 9, 2026 against deepmerge@4.3.1. Markdown · JSON

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

deepmerge ships CommonJS only. require("deepmerge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "deepmerge" 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("deepmerge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0.
  2. From ES modules use the default import: import deepmerge from "deepmerge"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/deepmerge
Latest
4.3.1 (Mar 16, 2023)
Module format
CommonJS
Last CommonJS version
4.3.1
TypeScript types
@types/deepmerge
Node engines
>=0.10.0
Weekly downloads
84.5M
License
MIT

Does deepmerge@4.3.1 actually load? Runtime test results

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

Runtimerequire("deepmerge")import "deepmerge"
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 deepmerge

ES modules (import)

import deepmerge from "deepmerge";

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 deepmerge = require("deepmerge");

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 (46 versions; the newest 46 shown).

VersionsFormatFirst published
0.0.1 – 4.3.1CommonJSJan 31, 2012

Frequently asked

Is deepmerge ESM-only?

deepmerge@4.3.1 is a CommonJS package. deepmerge ships CommonJS only. require("deepmerge") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "deepmerge" 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 deepmerge with ES module syntax?

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

Yes. import "deepmerge" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does deepmerge ship TypeScript types?

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

Links

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