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Is @aws-sdk/middleware-user-agent ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against @aws-sdk/middleware-user-agent@3.972.74. JSON

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

@aws-sdk/middleware-user-agent ships CommonJS only. require("@aws-sdk/middleware-user-agent") works everywhere. import "@aws-sdk/middleware-user-agent" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

Latest
3.972.74 (Aug 21, 2026)
Module format
CommonJS
Last CommonJS version
3.972.74
TypeScript types
Bundled
Node engines
>=20.0.0
License
Apache-2.0

Does @aws-sdk/middleware-user-agent@3.972.74 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@aws-sdk/middleware-user-agent") from a CommonJS file and import "@aws-sdk/middleware-user-agent" from an ES module.

Runtimerequire("@aws-sdk/middleware-user-agent")import "@aws-sdk/middleware-user-agent"
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 @aws-sdk/middleware-user-agent

ES modules (import)

import middlewareUserAgent from "@aws-sdk/middleware-user-agent";

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 middlewareUserAgent = require("@aws-sdk/middleware-user-agent");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (339 versions; the newest 60 shown).

VersionsFormatFirst published
3.972.15 – 3.972.74CommonJSFeb 26, 2026

Frequently asked

Is @aws-sdk/middleware-user-agent ESM-only?

@aws-sdk/middleware-user-agent@3.972.74 is a CommonJS package. @aws-sdk/middleware-user-agent ships CommonJS only. require("@aws-sdk/middleware-user-agent") works everywhere. import "@aws-sdk/middleware-user-agent" 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 @aws-sdk/middleware-user-agent with ES module syntax?

Yes. import middlewareUserAgent from "@aws-sdk/middleware-user-agent" 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 @aws-sdk/middleware-user-agent work in Bun?

Yes. import "@aws-sdk/middleware-user-agent" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @aws-sdk/middleware-user-agent ship TypeScript types?

Yes. @aws-sdk/middleware-user-agent bundles its own type declarations; no @types package is needed.

Links

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