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

PostCSS plugin to unwrap nested rules like how Sass does it

Last verified Sep 9, 2026 against postcss-nested@8.0.1. Markdown · JSON

ESM-only ESM-only since 8.0.0 — last CommonJS version is 7.0.2

postcss-nested dropped its CommonJS build in 8.0.0 (July 2026). The last version with a plain require()-able CommonJS entry is 7.0.2, published Nov 1, 2024; it declares support for Node.js >=18.0.

On Node.js 22.12+ and newer (postcss-nested@8.0.1 declares Node.js ^22.0.0 || ^24.0.0 || >= 26.0.0), require("postcss-nested") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Node.js 18 has no require(esm), and postcss-nested@8.0.1 declares Node.js ^22.0.0 || ^24.0.0 || >= 26.0.0, so 18 is outside its supported range anyway.

postcss-nested@8.0.1 declares engines "^22.0.0 || ^24.0.0 || >= 26.0.0", so Node.js 18, 20 are outside its supported range regardless of module format.

What to do

  1. On Node.js 22.12+ and newer (postcss-nested@8.0.1 declares Node.js ^22.0.0 || ^24.0.0 || >= 26.0.0), require("postcss-nested") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const postcssNested = await import("postcss-nested"). That works on every Node.js version the package supports (^22.0.0 || ^24.0.0 || >= 26.0.0).
  3. If you need a synchronous require() or run Node.js 18: npm install postcss-nested@7.0.2, the last CommonJS release (published Nov 1, 2024); it declares Node.js >=18.0.
  4. postcss-nested@8.0.1 declares engines "^22.0.0 || ^24.0.0 || >= 26.0.0", so Node.js 18, 20 are unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
8.0.1 (Aug 2, 2026)
Module format
ESM-only
Last CommonJS version
7.0.2
ESM-only since
8.0.0 (Jul 29, 2026)
TypeScript types
Bundled
Node engines
^22.0.0 || ^24.0.0 || >= 26.0.0
Weekly downloads
35.4M
License
MIT

Does postcss-nested@8.0.1 actually load? Runtime test results

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

Runtimerequire("postcss-nested")import "postcss-nested"
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-nested

ES modules (import)

import * as postcssNested from "postcss-nested";

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

CommonJS (require)

// Node.js 22.12+ and newer (verified):
const postcssNested = require("postcss-nested");

// Any Node.js version the package supports (^22.0.0 || ^24.0.0 || >= 26.0.0), from an async function:
async function main() {
  const postcssNested = await import("postcss-nested");
}

// Or pin the last CommonJS release (declares Node.js >=18.0):
// npm install postcss-nested@7.0.2

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 (41 versions; the newest 41 shown).

VersionsFormatFirst published
8.0.0 – 8.0.1ESM-onlyJul 29, 2026
0.1.0 – 7.0.2CommonJSNov 11, 2014

Frequently asked

Is postcss-nested ESM-only?

postcss-nested@8.0.1 is ESM-only. postcss-nested dropped its CommonJS build in 8.0.0 (July 2026). The last version with a plain require()-able CommonJS entry is 7.0.2, published Nov 1, 2024; it declares support for Node.js >=18.0.

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

7.0.2 is the last version of postcss-nested with a CommonJS build; it declares Node.js >=18.0. Install it with "npm install postcss-nested@7.0.2". Every version from 8.0.0 on is ESM-only.

How do I use postcss-nested from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const postcssNested = await import("postcss-nested"). That works on every Node.js version the package supports (^22.0.0 || ^24.0.0 || >= 26.0.0). On Node.js 22.12+ and newer (postcss-nested@8.0.1 declares Node.js ^22.0.0 || ^24.0.0 || >= 26.0.0), require("postcss-nested") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Alternatively pin postcss-nested@7.0.2 (declares Node.js >=18.0).

Does postcss-nested work in Bun?

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

Does postcss-nested ship TypeScript types?

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

Links

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