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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. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

postcss publishes both a CommonJS entry and a native ESM entry (ESM added in 8.0.0). require("postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^10 || ^12 || >=14. import "postcss" works alongside it.

What to do

  1. Nothing to change. require("postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^10 || ^12 || >=14. import * as postcss from "postcss" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
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 1.4.0✓ works✓ works

How to import postcss

ES modules (import)

import * as postcss from "postcss";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const postcss = require("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 (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") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^10 || ^12 || >=14. import "postcss" works alongside it.

Can I require postcss?

Yes. postcss ships a CommonJS entry alongside the native ESM entry. require("postcss") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^10 || ^12 || >=14.

Does postcss work in Bun?

Yes. import "postcss" loaded successfully in Bun 1.4.0 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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