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canirequire › Dual (CommonJS + ESM) › postcss

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

Tool for transforming styles with JS plugins

Last verified Sep 9, 2026 against postcss@8.5.28. JSON

Dual (CommonJS + ESM) Dual package — both require() and import work

postcss publishes both a CommonJS entry and a native ESM entry (ESM added in 8.0.0). require("postcss") and import "postcss" both work on every supported Node.js version and in Bun.

Latest
8.5.28 (Sep 3, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
8.5.28
Native ESM since
8.0.0
TypeScript types
Bundled
Node engines
^10 || ^12 || >=14
Weekly downloads
249.3M
License
MIT

Does postcss@8.5.28 actually load? Runtime test results

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

Runtimerequire("postcss")import "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✓ works✓ works

How to import postcss

ES modules (import)

import postcss from "postcss";

CommonJS (require)

const postcss = require("postcss");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (292 versions; the newest 60 shown).

VersionsFormatFirst published
8.4.19 – 8.5.28Dual (CommonJS + ESM)Nov 10, 2022

Frequently asked

Is postcss ESM-only?

postcss@8.5.28 ships CommonJS and ESM builds. postcss publishes both a CommonJS entry and a native ESM entry (ESM added in 8.0.0). require("postcss") and import "postcss" both work on every supported Node.js version and in Bun.

Can I require postcss?

Yes. postcss ships a CommonJS entry, so require("postcss") works on every Node.js version, alongside the native ESM entry for import.

Does postcss work in Bun?

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

Does postcss ship TypeScript types?

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

Links

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