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

Convert modern CSS into something browsers understand

Last verified Sep 9, 2026 against postcss-preset-env@11.5.2. JSON

ESM-only ESM-only since 11.0.0 — last CommonJS version is 10.6.1

postcss-preset-env dropped its CommonJS build in 11.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 10.6.1, published Jan 10, 2026.

On Node.js 20.19+, 22.12+ and every newer release, require("postcss-preset-env") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

postcss-preset-env@11.5.2 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
11.5.2 (Sep 6, 2026)
Module format
ESM-only
Last CommonJS version
10.6.1
ESM-only since
11.0.0 (Jan 14, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
Weekly downloads
6.6M
License
MIT-0

Does postcss-preset-env@11.5.2 actually load? Runtime test results

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

Runtimerequire("postcss-preset-env")import "postcss-preset-env"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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-preset-env

ES modules (import)

import postcssPresetEnv from "postcss-preset-env";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const postcssPresetEnv = require("postcss-preset-env");

// Any Node.js version:
const postcssPresetEnv = await import("postcss-preset-env");

// Or pin the last CommonJS release:
// npm install postcss-preset-env@10.6.1

Module format by version

Derived from the type, main and exports fields of every stable release on npm (153 versions; the newest 60 shown).

VersionsFormatFirst published
11.0.0 – 11.5.2ESM-onlyJan 14, 2026
9.5.1 – 10.6.1Dual (CommonJS + ESM)Mar 13, 2024

Frequently asked

Is postcss-preset-env ESM-only?

postcss-preset-env@11.5.2 is ESM-only. postcss-preset-env dropped its CommonJS build in 11.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 10.6.1, published Jan 10, 2026.

Which version of postcss-preset-env still supports CommonJS / require()?

10.6.1 is the last version of postcss-preset-env with a CommonJS build. Install it with "npm install postcss-preset-env@10.6.1". Every version from 11.0.0 on is ESM-only.

How do I use postcss-preset-env from a CommonJS file?

Use a dynamic import: const mod = await import("postcss-preset-env"). On Node.js 20.19+, 22.12+ and newer, a plain require("postcss-preset-env") also works for ESM packages that do not use top-level await. Alternatively pin postcss-preset-env@10.6.1.

Does postcss-preset-env work in Bun?

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

Does postcss-preset-env ship TypeScript types?

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

Links

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