Verschachtelte Destructuring-Alias-Switch-Guards in Next.js Route-Handlern

export function validateRouteContext(paramsObject) {
  const {
    params: { slug: [mainSegment, subSegment = 'overview'] = [] } = {},
    searchParams: { format: requestedFormat = 'json' } = {}
  } = paramsObject;
 
  routeGuard: switch (mainSegment) {
    case 'admin':
      if (subSegment === 'settings' && requestedFormat === 'json') {
        break routeGuard;
      }
      return { status: 403, error: 'Unauthorized route combination' };
    case 'public':
      return { status: 200, target: `${mainSegment}/${subSegment}` };
    default:
      return { status: 404, target: 'not-found' };
  }
 
  return { status: 200, target: `admin/${subSegment}?format=${requestedFormat}` };
}