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

CSS Object Model implementation and CSS parser

Last verified Sep 9, 2026 against cssom@0.5.0. Markdown · JSON

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

cssom ships CommonJS only. require("cssom") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "cssom" 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.

What to do

  1. require("cssom") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import cssom from "cssom"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/cssom
Latest
0.5.0 (Jun 20, 2021)
Module format
CommonJS
Last CommonJS version
0.5.0
TypeScript types
@types/cssom
Node engines
not declared
Weekly downloads
41.7M
License
MIT

Does cssom@0.5.0 actually load? Runtime test results

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

Runtimerequire("cssom")import "cssom"
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 cssom

ES modules (import)

import cssom from "cssom";

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 cssom = require("cssom");

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 (21 versions; the newest 21 shown).

VersionsFormatFirst published
0.2.0 – 0.5.0CommonJSOct 24, 2011

Frequently asked

Is cssom ESM-only?

cssom@0.5.0 is a CommonJS package. cssom ships CommonJS only. require("cssom") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "cssom" 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 cssom with ES module syntax?

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

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

Does cssom ship TypeScript types?

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

Links

Other commonjs packages

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