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Is class-variance-authority ESM-only? Can you require() it?

Class Variance Authority 🧬

Last verified Sep 9, 2026 against class-variance-authority@0.7.1. Markdown · JSON

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

class-variance-authority publishes both a CommonJS entry and a native ESM entry (ESM added in 0.5.0). require("class-variance-authority") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "class-variance-authority" works alongside it.

What to do

  1. Nothing to change. require("class-variance-authority") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as classVarianceAuthority from "class-variance-authority" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
0.7.1 (Nov 26, 2024)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
0.7.1
Native ESM since
0.5.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
54.3M
License
Apache-2.0

Does class-variance-authority@0.7.1 actually load? Runtime test results

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

Runtimerequire("class-variance-authority")import "class-variance-authority"
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 class-variance-authority

ES modules (import)

import * as classVarianceAuthority from "class-variance-authority";

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

CommonJS (require)

const classVarianceAuthority = require("class-variance-authority");

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 (18 versions; the newest 18 shown).

VersionsFormatFirst published
0.5.0 – 0.7.1Dual (CommonJS + ESM)Apr 2, 2023
0.0.0 – 0.4.0CommonJSJan 26, 2022

Frequently asked

Is class-variance-authority ESM-only?

class-variance-authority@0.7.1 ships CommonJS and ESM builds. class-variance-authority publishes both a CommonJS entry and a native ESM entry (ESM added in 0.5.0). require("class-variance-authority") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "class-variance-authority" works alongside it.

Can I require class-variance-authority?

Yes. class-variance-authority ships a CommonJS entry alongside the native ESM entry. require("class-variance-authority") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does class-variance-authority work in Bun?

Yes. import "class-variance-authority" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does class-variance-authority ship TypeScript types?

Yes. class-variance-authority bundles its own type declarations; no @types package is needed.

Links

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