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next.js/errors/postcss-function.mdx
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2026-03-10 19:37:31 +03:30

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---
title: PostCSS Configuration Is a Function
---
## Why This Error Occurred
The project's custom PostCSS configuration exports a function instead of an object.
## Possible Ways to Fix It
Adjust the custom PostCSS configuration to not export a function. Instead, return a plain object.
If you need environment information, read it from `process.env`.
**Before**
```js filename="postcss.config.js"
module.exports = ({ env }) => ({
plugins: {
'postcss-plugin': env === 'production' ? {} : false,
},
})
```
**After**
```js filename="postcss.config.js"
module.exports = {
plugins: {
'postcss-plugin': process.env.NODE_ENV === 'production' ? {} : false,
},
}
```