canirequire › CommonJS › merge2
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. JSON
CommonJS CommonJS — require() works on every Node.js version
merge2 ships CommonJS only. require("merge2") works everywhere. 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.
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.
| Runtime | require("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 | ✓ 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 (23 versions; the newest 23 shown).
| Versions | Format | First published |
|---|---|---|
| 0.2.0 – 1.4.1 | CommonJS | Oct 19, 2014 |
Frequently asked
Is merge2 ESM-only?
merge2@1.4.1 is a CommonJS package. merge2 ships CommonJS only. require("merge2") works everywhere. 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 on Sep 9, 2026.
Does merge2 ship TypeScript types?
Not bundled. Install the community types with "npm install -D @types/merge2".
Links
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