Exporting an object while declaring vs exporting an object after declaring in Next.js

I was recently writing the middleware.ts file in my Next.js project. And encountered the following situation:

// case 1
export const middleware = (...) => {...} // middleware works

export const config = {
  matcher: '/about',  // matcher works
};

// case 2
const middleware = (...) => {...} // middleware works

const config = {
  matcher: '/about',  // matcher does not work
};

export { middleware, config }

I was under the assumption that these ways of exporting functions and objects are equivalent. Is there some difference in practice (in terms of JavaScript modules)? Or is there a difference in the way Next.js is handling these for the middleware.ts file in particular?

Other details: Next.js version 15.0.0-rc.0