useLightningcss

Experimental support for using Lightning CSS with webpack. Lightning CSS is a fast CSS transformer and minifier, written in Rust.

If this option is not set, Next.js on webpack uses PostCSS with postcss-preset-env by default.

Turbopack uses Lightning CSS by default since Next 14.2. This configuration option has no effect on Turbopack. Turbopack always uses Lightning CSS.

import type { NextConfig } from 'next'
 
const nextConfig: NextConfig = {
  experimental: {
    useLightningcss: false, // default, ignored on Turbopack
  },
}
 
export default nextConfig

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