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

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Last verified Sep 9, 2026 against @aws-sdk/util-user-agent-browser@3.972.45. JSON

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

@aws-sdk/util-user-agent-browser ships CommonJS only. require("@aws-sdk/util-user-agent-browser") works everywhere. import "@aws-sdk/util-user-agent-browser" 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
3.972.45 (Aug 21, 2026)
Module format
CommonJS
Last CommonJS version
3.972.45
TypeScript types
Bundled
Node engines
not declared
License
Apache-2.0

Does @aws-sdk/util-user-agent-browser@3.972.45 actually load? Runtime test results

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

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

ES modules (import)

import utilUserAgentBrowser from "@aws-sdk/util-user-agent-browser";

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 utilUserAgentBrowser = require("@aws-sdk/util-user-agent-browser");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (211 versions; the newest 60 shown).

VersionsFormatFirst published
3.907.0 – 3.972.45CommonJSOct 9, 2025

Frequently asked

Is @aws-sdk/util-user-agent-browser ESM-only?

@aws-sdk/util-user-agent-browser@3.972.45 is a CommonJS package. @aws-sdk/util-user-agent-browser ships CommonJS only. require("@aws-sdk/util-user-agent-browser") works everywhere. import "@aws-sdk/util-user-agent-browser" 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/util-user-agent-browser with ES module syntax?

Yes. import utilUserAgentBrowser from "@aws-sdk/util-user-agent-browser" 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/util-user-agent-browser work in Bun?

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

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

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

Links

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