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Is merge-stream ESM-only? Can you require() it?

Create a stream that emits events from multiple other streams

Last verified Sep 9, 2026 against merge-stream@2.0.0. JSON

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

merge-stream ships CommonJS only. require("merge-stream") works everywhere. import "merge-stream" 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.

Latest
2.0.0 (May 23, 2019)
Module format
CommonJS
Last CommonJS version
2.0.0
TypeScript types
@types/merge-stream
Node engines
not declared
Weekly downloads
85.8M
License
MIT

Does merge-stream@2.0.0 actually load? Runtime test results

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

Runtimerequire("merge-stream")import "merge-stream"
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 merge-stream

ES modules (import)

import mergeStream from "merge-stream";

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 mergeStream = require("merge-stream");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (13 versions; the newest 13 shown).

VersionsFormatFirst published
0.0.0 – 2.0.0CommonJSJun 10, 2013

Frequently asked

Is merge-stream ESM-only?

merge-stream@2.0.0 is a CommonJS package. merge-stream ships CommonJS only. require("merge-stream") works everywhere. import "merge-stream" 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 merge-stream with ES module syntax?

Yes. import mergeStream from "merge-stream" 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 merge-stream work in Bun?

Yes. import "merge-stream" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does merge-stream ship TypeScript types?

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

Links

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