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Is clean-css ESM-only? Can you require() it?

A well-tested CSS minifier

Last verified Sep 9, 2026 against clean-css@5.3.3. JSON

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

clean-css ships CommonJS only. require("clean-css") works everywhere. import "clean-css" 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.

Latest
5.3.3 (Nov 30, 2023)
Module format
CommonJS
Last CommonJS version
5.3.3
TypeScript types
@types/clean-css
Node engines
>= 10.0
Weekly downloads
19.2M
License
MIT

Does clean-css@5.3.3 actually load? Runtime test results

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

Runtimerequire("clean-css")import "clean-css"
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 clean-css

ES modules (import)

import cleanCss from "clean-css";

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 cleanCss = require("clean-css");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (211 versions; the newest 60 shown).

VersionsFormatFirst published
3.4.17 – 5.3.3CommonJSJun 4, 2016

Frequently asked

Is clean-css ESM-only?

clean-css@5.3.3 is a CommonJS package. clean-css ships CommonJS only. require("clean-css") works everywhere. import "clean-css" 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 clean-css with ES module syntax?

Yes. import cleanCss from "clean-css" 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 clean-css work in Bun?

Yes. import "clean-css" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does clean-css ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/clean-css".

Links

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