# Is postcss-selector-parser ESM-only? Can you require() it?

> postcss-selector-parser@7.1.6 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Selector parser with built in methods for working with selector strings.

Last verified Sep 9, 2026 against postcss-selector-parser@7.1.6.

postcss-selector-parser ships CommonJS only. require("postcss-selector-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "postcss-selector-parser" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

## What to do

1. require("postcss-selector-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.
2. From ES modules use the default import: import postcssSelectorParser from "postcss-selector-parser"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 7.1.6 (Sep 3, 2026)
- Module format: CommonJS
- Last CommonJS version: 7.1.6
- TypeScript types: bundled
- Node engines: >=4
- Weekly downloads: 100.4M
- License: MIT

## Runtime test results for postcss-selector-parser@7.1.6

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

| Runtime | require("postcss-selector-parser") | import "postcss-selector-parser" |
|---|---|---|
| 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-selector-parser

ES modules:

```js
import postcssSelectorParser from "postcss-selector-parser";
```

CommonJS:

```js
const postcssSelectorParser = require("postcss-selector-parser");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (61 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.2 – 7.1.6 | CommonJS | May 29, 2015 |

## Frequently asked

**Is postcss-selector-parser ESM-only?**

postcss-selector-parser@7.1.6 is a CommonJS package. postcss-selector-parser ships CommonJS only. require("postcss-selector-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "postcss-selector-parser" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

**Can I import postcss-selector-parser with ES module syntax?**

Yes. import postcssSelectorParser from "postcss-selector-parser" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

**Does postcss-selector-parser work in Bun?**

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

**Does postcss-selector-parser ship TypeScript types?**

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

## Links

- [postcss-selector-parser on npm](https://www.npmjs.com/package/postcss-selector-parser)
- [Source repository](https://github.com/postcss/postcss-selector-parser)
- [HTML version](https://canirequire.com/package/postcss-selector-parser/)
- [JSON version](https://canirequire.com/package/postcss-selector-parser.json)

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