# @unocss/transformer-compile-class
<!-- @unocss-ignore -->
Compile group of classes into one class. Inspired by [WindiCSS's compilation mode](https://windicss.org/posts/modes.html#compilation-mode) and [#948](https://github.com/unocss/unocss/issues/948) by [@UltraCakeBakery](https://github.com/UltraCakeBakery).
## Install
```bash
npm i -D @unocss/transformer-compile-class
```
```ts
// uno.config.ts
import { defineConfig } from 'unocss'
import transformerCompileClass from '@unocss/transformer-compile-class'
export default defineConfig({
// ...
transformers: [
transformerCompileClass(),
],
})
```
## Usage
At the begin of your class strings, **add `:uno:` at the begin of the strings** to mark them for compilation. For example:
```html
<div class=":uno: text-center sm:text-left">
<div class=":uno: text-sm font-bold hover:text-red"/>
</div>
```
Will be compiled to:
```html
<div class="uno-qlmcrp">
<div class="uno-0qw2gr"/>
</div>
```
```css
.uno-qlmcrp {
text-align: center;
}
.uno-0qw2gr {
font-size: 0.875rem;
line-height: 1.25rem;
font-weight: 700;
}
.uno-0qw2gr:hover {
--un-text-opacity: 1;
color: rgb(248 113 113 / var(--un-text-opacity));
}
@media (min-width: 640px) {
.uno-qlmcrp {
text-align: left;
}
}
```
## Options
You can config the trigger string and prefix for compile class with the options. Refers to [the types](https://github.com/unocss/unocss/blob/main/packages/transformer-compile-class/src/index.ts#L4) for details.
## License
MIT License © 2021-PRESENT [Anthony Fu](https://github.com/antfu)