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

Last verified Sep 9, 2026 against @smithy/core@3.33.3. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

@smithy/core publishes both a CommonJS entry and a native ESM entry (ESM added in 2.1.0). require("@smithy/core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0. import "@smithy/core" works alongside it.

What to do

  1. Nothing to change. require("@smithy/core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0. import * as core from "@smithy/core" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
3.33.3 (Aug 20, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
3.33.3
Native ESM since
2.1.0
TypeScript types
Bundled
Node engines
>=18.0.0
Weekly downloads
59.8M
License
Apache-2.0

Does @smithy/core@3.33.3 actually load? Runtime test results

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

Runtimerequire("@smithy/core")import "@smithy/core"
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 1.4.0✓ works✓ works

How to import @smithy/core

ES modules (import)

import * as core from "@smithy/core";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const core = require("@smithy/core");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (162 versions; the newest 60 shown).

VersionsFormatFirst published
3.20.1 – 3.33.3Dual (CommonJS + ESM)Jan 7, 2026

Frequently asked

Is @smithy/core ESM-only?

@smithy/core@3.33.3 ships CommonJS and ESM builds. @smithy/core publishes both a CommonJS entry and a native ESM entry (ESM added in 2.1.0). require("@smithy/core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0. import "@smithy/core" works alongside it.

Can I require @smithy/core?

Yes. @smithy/core ships a CommonJS entry alongside the native ESM entry. require("@smithy/core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.0.0.

Does @smithy/core work in Bun?

Yes. import "@smithy/core" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @smithy/core ship TypeScript types?

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

Links

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