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Is @smithy/signature-v4 ESM-only? Can you require() it?

A standalone implementation of the AWS Signature V4 request signing algorithm

Last verified Sep 9, 2026 against @smithy/signature-v4@5.7.3. JSON

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

@smithy/signature-v4 ships CommonJS only. require("@smithy/signature-v4") works everywhere. import "@smithy/signature-v4" 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
5.7.3 (Aug 20, 2026)
Module format
CommonJS
Last CommonJS version
5.7.3
TypeScript types
Bundled
Node engines
>=18.0.0
License
Apache-2.0

Does @smithy/signature-v4@5.7.3 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@smithy/signature-v4") from a CommonJS file and import "@smithy/signature-v4" from an ES module.

Runtimerequire("@smithy/signature-v4")import "@smithy/signature-v4"
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 @smithy/signature-v4

ES modules (import)

import signatureV4 from "@smithy/signature-v4";

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 signatureV4 = require("@smithy/signature-v4");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (102 versions; the newest 60 shown).

VersionsFormatFirst published
4.1.3 – 5.7.3CommonJSSep 13, 2024

Frequently asked

Is @smithy/signature-v4 ESM-only?

@smithy/signature-v4@5.7.3 is a CommonJS package. @smithy/signature-v4 ships CommonJS only. require("@smithy/signature-v4") works everywhere. import "@smithy/signature-v4" 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 @smithy/signature-v4 with ES module syntax?

Yes. import signatureV4 from "@smithy/signature-v4" 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 @smithy/signature-v4 work in Bun?

Yes. import "@smithy/signature-v4" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @smithy/signature-v4 ship TypeScript types?

Yes. @smithy/signature-v4 bundles its own type declarations; no @types package is needed.

Links

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