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# postcss8 support for nuxt 2.15+
Since [nuxt@2.15](https://github.com/nuxt/nuxt.js/releases/tag/v2.15.0) nuxt supports opting-in to use `postcss@8` (via [nuxt/nuxt.js#8546](https://github.com/nuxt/nuxt.js/pull/8546)).
Upgrade is pending for [csstools/postcss-preset-env#191](https://github.com/csstools/postcss-preset-env/issues/191) (see [nuxt/nuxt.js#8087](https://github.com/nuxt/nuxt.js/issues/8087) and [nuxt/nuxt.js#8408](https://github.com/nuxt/nuxt.js/pull/8408))
In the meantime, this module allows rapid migration:
- Ensures supported nuxt version is used (`>= 2.15.3`)
- Forces to use upgraded dependencies using `__NUXT_PREPATHS__`
- Will be updated accordingly to self-disable when a nuxt version with default postcss8 detected
- Use `autoprefixer` instead of `postcss-preset-env`
## Usage
Install `@nuxt/postcss8` as `devDependency`:
```sh
yarn add --dev @nuxt/postcss8
# or
npm i -D @nuxt/postcss8
```
Add `@nuxt/postcss8` to `buildModules` in `nuxt.config`:
```js
// nuxt.config
export default {
buildModules: [
'@nuxt/postcss8'
]
}
```
### For module authors
If you have a nuxt module that requires postcss@8, install `postcss@8` and `@nuxt/postcss8` as `dependency`:
```sh
yarn add postcss@8 @nuxt/postcss8
# or
npm i postcss@8 @nuxt/postcss8
```
Inside module:
```js
export default async function() {
await this.addModule(require('@nuxt/postcss8'))
}
```
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