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Is merge2 ESM-only? Can you require() it?

Merge multiple streams into one stream in sequence or parallel.

Last verified Sep 9, 2026 against merge2@1.4.1. Markdown · JSON

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

merge2 ships CommonJS only. require("merge2") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 8. import "merge2" 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("merge2") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 8.
  2. From ES modules use the default import: import merge2 from "merge2"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/merge2
Latest
1.4.1 (Jun 3, 2020)
Module format
CommonJS
Last CommonJS version
1.4.1
TypeScript types
@types/merge2
Node engines
>= 8
Weekly downloads
83.6M
License
MIT

Does merge2@1.4.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("merge2") from a CommonJS file and import "merge2" from an ES module.

Runtimerequire("merge2")import "merge2"
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 merge2

ES modules (import)

import merge2 from "merge2";

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 merge2 = require("merge2");

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 (23 versions; the newest 23 shown).

VersionsFormatFirst published
0.2.0 – 1.4.1CommonJSOct 19, 2014

Frequently asked

Is merge2 ESM-only?

merge2@1.4.1 is a CommonJS package. merge2 ships CommonJS only. require("merge2") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 8. import "merge2" 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 merge2 with ES module syntax?

Yes. import merge2 from "merge2" 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 merge2 work in Bun?

Yes. import "merge2" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does merge2 ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/merge2".

Links

Other commonjs packages

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