npm i -D @unocss/processor-lightningcss

import processorLightningCSS from '@unocss/processor-lightningcss'
import { defineConfig } from 'unocss'

export default defineConfig({
  // ...
  processors: [
    processorLightningCSS({
      minify: true,
      targets: {
        // Example: modern browsers
        chrome: 111 << 16,
        safari: 15 << 16,
      },
    }),
  ],
})