# Is @adobe/css-tools ESM-only? Can you require() it?

> @adobe/css-tools@4.5.0 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

A modern CSS parser and stringifier with TypeScript support

Last verified Sep 9, 2026 against @adobe/css-tools@4.5.0.

@adobe/css-tools publishes both a CommonJS entry and a native ESM entry (ESM added in 4.1.0). require("@adobe/css-tools") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@adobe/css-tools" works alongside it.

## What to do

1. Nothing to change. require("@adobe/css-tools") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as cssTools from "@adobe/css-tools" works alongside it; use named imports for what the ESM entry exports.
2. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 4.5.0 (May 21, 2026)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 4.5.0
- Native ESM since: 4.1.0
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 39.3M
- License: MIT

## Runtime test results for @adobe/css-tools@4.5.0

Installed and executed on Sep 9, 2026 with require("@adobe/css-tools") from a CommonJS file and import "@adobe/css-tools" from an ES module.

| Runtime | require("@adobe/css-tools") | import "@adobe/css-tools" |
|---|---|---|
| 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 @adobe/css-tools

ES modules:

```js
import * as cssTools from "@adobe/css-tools";
```

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

CommonJS:

```js
const cssTools = require("@adobe/css-tools");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (15 versions; the newest 15 shown).

| Versions | Format | First published |
|---|---|---|
| 4.1.0 – 4.5.0 | Dual (CommonJS + ESM) | Jan 25, 2023 |
| 4.0.0 – 4.0.2 | CommonJS | Jul 14, 2022 |

## Frequently asked

**Is @adobe/css-tools ESM-only?**

@adobe/css-tools@4.5.0 ships CommonJS and ESM builds. @adobe/css-tools publishes both a CommonJS entry and a native ESM entry (ESM added in 4.1.0). require("@adobe/css-tools") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@adobe/css-tools" works alongside it.

**Can I require @adobe/css-tools?**

Yes. @adobe/css-tools ships a CommonJS entry alongside the native ESM entry. require("@adobe/css-tools") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

**Does @adobe/css-tools work in Bun?**

Yes. import "@adobe/css-tools" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @adobe/css-tools ship TypeScript types?**

Yes. @adobe/css-tools bundles its own type declarations; no @types package is needed.

## Links

- [@adobe/css-tools on npm](https://www.npmjs.com/package/@adobe/css-tools)
- [Source repository](https://github.com/adobe/css-tools)
- [HTML version](https://canirequire.com/package/@adobe/css-tools/)
- [JSON version](https://canirequire.com/package/@adobe/css-tools.json)

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