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

PostCSS loader for webpack

Last verified Sep 9, 2026 against postcss-loader@8.2.1. JSON

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

postcss-loader ships CommonJS only. require("postcss-loader") works everywhere. import "postcss-loader" 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
8.2.1 (Feb 15, 2026)
Module format
CommonJS
Last CommonJS version
8.2.1
TypeScript types
None
Node engines
>= 18.12.0
Weekly downloads
12.9M
License
MIT

Does postcss-loader@8.2.1 actually load? Runtime test results

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

Runtimerequire("postcss-loader")import "postcss-loader"
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 postcss-loader

ES modules (import)

import postcssLoader from "postcss-loader";

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 postcssLoader = require("postcss-loader");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (88 versions; the newest 60 shown).

VersionsFormatFirst published
1.2.2 – 8.2.1CommonJSJan 11, 2017

Frequently asked

Is postcss-loader ESM-only?

postcss-loader@8.2.1 is a CommonJS package. postcss-loader ships CommonJS only. require("postcss-loader") works everywhere. import "postcss-loader" 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 postcss-loader with ES module syntax?

Yes. import postcssLoader from "postcss-loader" 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 postcss-loader work in Bun?

Yes. import "postcss-loader" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does postcss-loader ship TypeScript types?

No. postcss-loader ships no type declarations and there is no @types package for it.

Links

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