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

Use Custom Properties Queries in CSS

Last verified Sep 9, 2026 against postcss-custom-properties@15.0.1. Markdown · JSON

ESM-only ESM-only since 15.0.0 — last CommonJS version is 14.0.6

postcss-custom-properties dropped its CommonJS build in 15.0.0 (January 2026). The last version with a plain require()-able CommonJS entry is 14.0.6, published Jun 5, 2025; it declares support for Node.js >=18.

On Node.js 20.19+, 22.12+ and newer, require("postcss-custom-properties") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Node.js 18 has no require(esm), and postcss-custom-properties@15.0.1 declares Node.js >=20.19.0, so 18 is outside its supported range anyway.

postcss-custom-properties@15.0.1 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("postcss-custom-properties") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const postcssCustomProperties = await import("postcss-custom-properties"). That works on every Node.js version the package supports (>=20.19.0).
  3. If you need a synchronous require() or run Node.js 18: npm install postcss-custom-properties@14.0.6, the last CommonJS release (published Jun 5, 2025); it declares Node.js >=18.
  4. postcss-custom-properties@15.0.1 declares engines ">=20.19.0", so Node.js 18 is unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
15.0.1 (Feb 21, 2026)
Module format
ESM-only
Last CommonJS version
14.0.6
ESM-only since
15.0.0 (Jan 14, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
Weekly downloads
6.8M
License
MIT

Does postcss-custom-properties@15.0.1 actually load? Runtime test results

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

Runtimerequire("postcss-custom-properties")import "postcss-custom-properties"
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 1.4.0✓ works✓ works

How to import postcss-custom-properties

ES modules (import)

import * as postcssCustomProperties from "postcss-custom-properties";

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

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const postcssCustomProperties = require("postcss-custom-properties");

// Any Node.js version the package supports (>=20.19.0), from an async function:
async function main() {
  const postcssCustomProperties = await import("postcss-custom-properties");
}

// Or pin the last CommonJS release (declares Node.js >=18):
// npm install postcss-custom-properties@14.0.6

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 (96 versions; the newest 60 shown).

VersionsFormatFirst published
15.0.0 – 15.0.1ESM-onlyJan 14, 2026
12.1.0 – 14.0.6Dual (CommonJS + ESM)Jan 12, 2022
12.0.1 – 12.0.4CommonJSDec 16, 2021
12.0.0Dual (CommonJS + ESM)Sep 17, 2021
8.0.7 – 11.0.0CommonJSOct 2, 2018

Frequently asked

Is postcss-custom-properties ESM-only?

postcss-custom-properties@15.0.1 is ESM-only. postcss-custom-properties dropped its CommonJS build in 15.0.0 (January 2026). The last version with a plain require()-able CommonJS entry is 14.0.6, published Jun 5, 2025; it declares support for Node.js >=18.

Which version of postcss-custom-properties still supports CommonJS / require()?

14.0.6 is the last version of postcss-custom-properties with a CommonJS build; it declares Node.js >=18. Install it with "npm install postcss-custom-properties@14.0.6". Every version from 15.0.0 on is ESM-only.

How do I use postcss-custom-properties from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const postcssCustomProperties = await import("postcss-custom-properties"). That works on every Node.js version the package supports (>=20.19.0). On Node.js 20.19+, 22.12+ and newer, require("postcss-custom-properties") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin postcss-custom-properties@14.0.6 (declares Node.js >=18).

Does postcss-custom-properties work in Bun?

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

Does postcss-custom-properties ship TypeScript types?

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

Links

Other esm-only packages

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