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canirequire › Dual (CommonJS + ESM) › clsx

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

A tiny (239B) utility for constructing className strings conditionally.

Last verified Sep 9, 2026 against clsx@2.1.1. Markdown · JSON

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

clsx publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("clsx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6. import "clsx" works alongside it.

What to do

  1. Nothing to change. require("clsx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6. import * as clsx from "clsx" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
2.1.1 (Apr 23, 2024)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
2.1.1
Native ESM since
2.0.0
TypeScript types
Bundled
Node engines
>=6
Weekly downloads
105.5M
License
MIT

Does clsx@2.1.1 actually load? Runtime test results

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

Runtimerequire("clsx")import "clsx"
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 clsx

ES modules (import)

import * as clsx from "clsx";

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

CommonJS (require)

const clsx = require("clsx");

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 (14 versions; the newest 14 shown).

VersionsFormatFirst published
2.0.0 – 2.1.1Dual (CommonJS + ESM)Jul 15, 2023
0.0.1 – 1.2.1CommonJSDec 24, 2018

Frequently asked

Is clsx ESM-only?

clsx@2.1.1 ships CommonJS and ESM builds. clsx publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("clsx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6. import "clsx" works alongside it.

Can I require clsx?

Yes. clsx ships a CommonJS entry alongside the native ESM entry. require("clsx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.

Does clsx work in Bun?

Yes. import "clsx" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does clsx ship TypeScript types?

Yes. clsx bundles its own type declarations; no @types package is needed.

Links

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