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

simplified stream construction

Last verified Sep 9, 2026 against through@2.3.8. JSON

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

through ships CommonJS only. require("through") works everywhere. import "through" 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
2.3.8 (Jul 3, 2015)
Module format
CommonJS
Last CommonJS version
2.3.8
TypeScript types
@types/through
Node engines
not declared
Weekly downloads
42.0M
License
MIT

Does through@2.3.8 actually load? Runtime test results

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

Runtimerequire("through")import "through"
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 through

ES modules (import)

import through from "through";

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 through = require("through");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (29 versions; the newest 29 shown).

VersionsFormatFirst published
0.0.1 – 2.3.8CommonJSJul 4, 2012

Frequently asked

Is through ESM-only?

through@2.3.8 is a CommonJS package. through ships CommonJS only. require("through") works everywhere. import "through" 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 through with ES module syntax?

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

Yes. import "through" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does through ship TypeScript types?

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

Links

Other commonjs packages

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