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Tim NeutkensandGitHub 0f09c40ac9 Turbopack: Better error for sassOptions.functions as it's unsupported (#85073)
## What?

Implements an error for the case where Turbopack is used with
sassOptions.functions.

Fixes #65241
2025-10-19 14:45:40 -07:00

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---
title: sassOptions
description: Configure Sass options.
---
`sassOptions` allow you to configure the Sass compiler.
```ts filename="next.config.ts" switcher
import type { NextConfig } from 'next'
const sassOptions = {
additionalData: `
$var: red;
`,
}
const nextConfig: NextConfig = {
sassOptions: {
...sassOptions,
implementation: 'sass-embedded',
},
}
export default nextConfig
```
```js filename="next.config.js" switcher
/** @type {import('next').NextConfig} */
const sassOptions = {
additionalData: `
$var: red;
`,
}
const nextConfig = {
sassOptions: {
...sassOptions,
implementation: 'sass-embedded',
},
}
module.exports = nextConfig
```
> **Good to know:**
>
> - `sassOptions` are not typed outside of `implementation` because Next.js does not maintain the other possible properties.
> - The `functions` property for defining custom Sass functions is only supported with webpack. When using Turbopack, custom Sass functions are not available because Turbopack's Rust-based architecture cannot directly execute JavaScript functions passed through this option.