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

An implementation of the CSSStyleDeclaration class from the CSS Object Model specification

Last verified Sep 9, 2026 against cssstyle@6.2.0. JSON

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

cssstyle ships CommonJS only. require("cssstyle") works everywhere. import "cssstyle" 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
6.2.0 (Mar 2, 2026)
Module format
CommonJS
Last CommonJS version
6.2.0
TypeScript types
@types/cssstyle
Node engines
>=20
Weekly downloads
58.3M
License
MIT

Does cssstyle@6.2.0 actually load? Runtime test results

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

Runtimerequire("cssstyle")import "cssstyle"
Node.js 18✗ failsERR_REQUIRE_ESM✗ failsERR_REQUIRE_ESM
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

A failing require() on a CommonJS package usually means the package needs a browser/DOM global, a peer dependency, or a native binary that is not available in a bare Node.js process.

How to import cssstyle

ES modules (import)

import cssstyle from "cssstyle";

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 cssstyle = require("cssstyle");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (76 versions; the newest 60 shown).

VersionsFormatFirst published
0.2.15 – 6.2.0CommonJSOct 6, 2014

Frequently asked

Is cssstyle ESM-only?

cssstyle@6.2.0 is a CommonJS package. cssstyle ships CommonJS only. require("cssstyle") works everywhere. import "cssstyle" 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 cssstyle with ES module syntax?

Yes. import cssstyle from "cssstyle" 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 cssstyle work in Bun?

Yes. import "cssstyle" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does cssstyle ship TypeScript types?

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

Links

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