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Is rollup-plugin-postcss ESM-only? Can you require() it?

Seamless integration between Rollup and PostCSS

Last verified Sep 9, 2026 against rollup-plugin-postcss@4.0.2. Markdown · JSON

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

rollup-plugin-postcss ships CommonJS only. require("rollup-plugin-postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10. import "rollup-plugin-postcss" 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("rollup-plugin-postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.
  2. From ES modules use the default import: import rollupPluginPostcss from "rollup-plugin-postcss"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
4.0.2 (Nov 22, 2021)
Module format
CommonJS
Last CommonJS version
4.0.2
TypeScript types
Bundled
Node engines
>=10
Weekly downloads
1.3M
License
MIT

Does rollup-plugin-postcss@4.0.2 actually load? Runtime test results

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

Runtimerequire("rollup-plugin-postcss")import "rollup-plugin-postcss"
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 rollup-plugin-postcss

ES modules (import)

import rollupPluginPostcss from "rollup-plugin-postcss";

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 rollupPluginPostcss = require("rollup-plugin-postcss");

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 (86 versions; the newest 60 shown).

VersionsFormatFirst published
1.0.2 – 4.0.2CommonJSJan 10, 2018

Frequently asked

Is rollup-plugin-postcss ESM-only?

rollup-plugin-postcss@4.0.2 is a CommonJS package. rollup-plugin-postcss ships CommonJS only. require("rollup-plugin-postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10. import "rollup-plugin-postcss" 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 rollup-plugin-postcss with ES module syntax?

Yes. import rollupPluginPostcss from "rollup-plugin-postcss" 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 rollup-plugin-postcss work in Bun?

Yes. import "rollup-plugin-postcss" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does rollup-plugin-postcss ship TypeScript types?

Yes. rollup-plugin-postcss bundles its own type declarations; no @types package is needed.

Links

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