# Is fast-sass-loader ESM-only? Can you require() it?

> fast-sass-loader@2.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

fast sass loader for Webpack

Last verified Sep 9, 2026 against fast-sass-loader@2.0.1.

fast-sass-loader ships CommonJS only. require("fast-sass-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-sass-loader" 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("fast-sass-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import fastSassLoader from "fast-sass-loader"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for fast-sass-loader; declare the module yourself if you need them.

## Facts

- Latest: 2.0.1 (Nov 18, 2021)
- Module format: CommonJS
- Last CommonJS version: 2.0.1
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 14K
- License: MIT

## Runtime test results for fast-sass-loader@2.0.1

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

| Runtime | require("fast-sass-loader") | import "fast-sass-loader" |
|---|---|---|
| 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 fast-sass-loader

ES modules:

```js
import fastSassLoader from "fast-sass-loader";
```

CommonJS:

```js
const fastSassLoader = require("fast-sass-loader");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (27 versions; the newest 27 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 2.0.1 | CommonJS | Aug 21, 2016 |

## Frequently asked

**Is fast-sass-loader ESM-only?**

fast-sass-loader@2.0.1 is a CommonJS package. fast-sass-loader ships CommonJS only. require("fast-sass-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-sass-loader" 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 fast-sass-loader with ES module syntax?**

Yes. import fastSassLoader from "fast-sass-loader" 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 fast-sass-loader work in Bun?**

Yes. import "fast-sass-loader" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does fast-sass-loader ship TypeScript types?**

No. fast-sass-loader ships no type declarations and there is no @types package for it.

## Links

- [fast-sass-loader on npm](https://www.npmjs.com/package/fast-sass-loader)
- [Source repository](https://github.com/yibn2008/fast-sass-loader)
- [HTML version](https://canirequire.com/package/fast-sass-loader/)
- [JSON version](https://canirequire.com/package/fast-sass-loader.json)

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