middleware.ts

import { NextRequest, NextResponse } from 'next/server';
import { isMarkdownPreferred, rewritePath } from 'fumadocs-core/negotiation';

const { rewrite: rewriteLLM } = rewritePath('/*path', '/llms.mdx/*path');

export default function proxy(request: NextRequest) {
  if (isMarkdownPreferred(request)) {
    const result = rewriteLLM(request.nextUrl.pathname);

    if (result) {
      return NextResponse.rewrite(new URL(result, request.nextUrl));
    }
  }

  return NextResponse.next();
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - api (API routes)
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public files (public folder)
     */
    '/((?!api|_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp|ico)).*)',
  ],
};