# Is csstype ESM-only? Can you require() it?

> csstype@3.2.3 has no importable main entry. No JavaScript entry point.

Strict TypeScript and Flow types for style based on MDN data

Last verified Sep 9, 2026 against csstype@3.2.3.

csstype does not expose a JavaScript entry point in package.json. It is likely a CLI, a stylesheet, a type-definition package, or an asset bundle, so require() and import are not the way to use it.

## What to do

1. Do not require() or import csstype: it has no JavaScript entry point. Use it as a CLI (npx csstype), a stylesheet, an asset, or a type-definition package as its README describes.
2. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 3.2.3 (Nov 17, 2025)
- Module format: No JS entry point
- Last CommonJS version: n/a
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 142.8M
- License: MIT

## Runtime test results for csstype@3.2.3

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

| Runtime | require("csstype") | import "csstype" |
|---|---|---|
| Node.js 18 | fails (MODULE_NOT_FOUND) | fails (ERR_MODULE_NOT_FOUND) |
| Node.js 20 | fails (MODULE_NOT_FOUND) | fails (ERR_MODULE_NOT_FOUND) |
| Node.js 22 | fails (MODULE_NOT_FOUND) | fails (ERR_MODULE_NOT_FOUND) |
| Node.js 24 | fails (MODULE_NOT_FOUND) | fails (ERR_MODULE_NOT_FOUND) |
| Node.js 26 | fails (MODULE_NOT_FOUND) | fails (ERR_MODULE_NOT_FOUND) |
| Bun 1.4.0 | fails (Error) | fails (Error) |

## How to import csstype

ES modules:

```js
import * as csstype from "csstype";
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (75 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 2.0.0 – 3.2.3 | No JS entry point | Mar 19, 2018 |

## Frequently asked

**Is csstype ESM-only?**

csstype@3.2.3 has no importable main entry. csstype does not expose a JavaScript entry point in package.json. It is likely a CLI, a stylesheet, a type-definition package, or an asset bundle, so require() and import are not the way to use it.

**Does csstype work in Bun?**

Importing csstype failed in Bun 1.4.0 on Sep 9, 2026: error: Cannot find package 'csstype' from '/Users/boat/Projects/top-seo/data/probe-work/csstype/imp.mjs'

**Does csstype ship TypeScript types?**

Yes. csstype bundles its own type declarations; no @types package is needed.

## Links

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

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