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

writable stream that concatenates strings or binary data and calls a callback with the result

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

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

concat-stream ships CommonJS only. require("concat-stream") works everywhere. import "concat-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 (Dec 21, 2018)
Module format
CommonJS
Last CommonJS version
2.0.0
TypeScript types
@types/concat-stream
Node engines
not declared
Weekly downloads
38.5M
License
MIT

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

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

Runtimerequire("concat-stream")import "concat-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 concat-stream

ES modules (import)

import concatStream from "concat-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 concatStream = require("concat-stream");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (37 versions; the newest 37 shown).

VersionsFormatFirst published
0.0.1 – 2.0.0CommonJSAug 3, 2012

Frequently asked

Is concat-stream ESM-only?

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

Yes. import concatStream from "concat-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 concat-stream work in Bun?

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

Does concat-stream ship TypeScript types?

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

Links

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