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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. JSON

Dual (CommonJS + ESM) Dual package — both require() and import work

clsx publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("clsx") and import "clsx" both work on every supported Node.js version and in Bun.

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✓ works✓ works

How to import clsx

ES modules (import)

import clsx from "clsx";

CommonJS (require)

const clsx = require("clsx");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (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") and import "clsx" both work on every supported Node.js version and in Bun.

Can I require clsx?

Yes. clsx ships a CommonJS entry, so require("clsx") works on every Node.js version, alongside the native ESM entry for import.

Does clsx work in Bun?

Yes. import "clsx" loaded successfully in Bun 1.4 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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