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

> svelte-preprocess@6.0.5 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A Svelte preprocessor wrapper with baked-in support for commonly used preprocessors

Last verified Sep 9, 2026 against svelte-preprocess@6.0.5.

svelte-preprocess ships CommonJS only. require("svelte-preprocess") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0. import "svelte-preprocess" 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("svelte-preprocess") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0.
2. From ES modules use the default import: import sveltePreprocess from "svelte-preprocess"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 6.0.5 (May 25, 2026)
- Module format: CommonJS
- Last CommonJS version: 6.0.5
- TypeScript types: bundled
- Node engines: >= 18.0.0
- Weekly downloads: 330K
- License: MIT

## Runtime test results for svelte-preprocess@6.0.5

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

| Runtime | require("svelte-preprocess") | import "svelte-preprocess" |
|---|---|---|
| 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 svelte-preprocess

ES modules:

```js
import sveltePreprocess from "svelte-preprocess";
```

CommonJS:

```js
const sveltePreprocess = require("svelte-preprocess");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (172 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 4.2.2 – 6.0.5 | CommonJS | Sep 16, 2020 |

## Frequently asked

**Is svelte-preprocess ESM-only?**

svelte-preprocess@6.0.5 is a CommonJS package. svelte-preprocess ships CommonJS only. require("svelte-preprocess") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0. import "svelte-preprocess" 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 svelte-preprocess with ES module syntax?**

Yes. import sveltePreprocess from "svelte-preprocess" 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 svelte-preprocess work in Bun?**

Yes. import "svelte-preprocess" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does svelte-preprocess ship TypeScript types?**

Yes. svelte-preprocess bundles its own type declarations; no @types package is needed.

## Links

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

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