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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. 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 you can require() on every Node.js version, including 18 and older, is 7.0.2, published Nov 1, 2024.

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

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.

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✓ works✓ works

How to import postcss-nested

ES modules (import)

import postcssNested from "postcss-nested";

CommonJS (require)

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

// Any Node.js version:
const postcssNested = await import("postcss-nested");

// Or pin the last CommonJS release:
// 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 (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 you can require() on every Node.js version, including 18 and older, is 7.0.2, published Nov 1, 2024.

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

7.0.2 is the last version of postcss-nested with a CommonJS build. 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?

Use a dynamic import: const mod = await import("postcss-nested"). On Node.js 20.19+, 22.12+ and newer, a plain require("postcss-nested") also works for ESM packages that do not use top-level await. Alternatively pin postcss-nested@7.0.2.

Does postcss-nested work in Bun?

Yes. import "postcss-nested" loaded successfully in Bun 1.4 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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