Why did baseUrl get deprecated?

[leo-petrucci]

It's pretty common for a lot of applications to have a single API (api.myapp.com) but multiple frontends that consume it (app.myapp.com, admin.myapp.com, etc.).

In Next-Auth v3 I could set baseUrl on SessionProvider (The type is actually still there for some reason) so that separate frontends could share the same session.

As of v4 this is not the case anymore, The session provider will always fetch a relative path wherever the app is running.

export function apiBaseUrl(__NEXTAUTH: NextAuthClientConfig) {
  if (typeof window === "undefined") {
    // Return absolute path when called server side
    return `${__NEXTAUTH.baseUrlServer}${__NEXTAUTH.basePathServer}`
  }
  // Return relative path when called client side
  return __NEXTAUTH.basePath
}

To fix this I've had to copy the entirety of SessionProvider + useSession into my own codebase to allow to change the above to:

export function apiBaseUrl(__NEXTAUTH: NextAuthClientConfig) {
  if (typeof window === "undefined") {
    // Return absolute path when called server side
    return `${__NEXTAUTH.baseUrlServer}${__NEXTAUTH.basePathServer}`
  }
  // Return relative path when called client side
  return `${__NEXTAUTH.baseUrl}{__NEXTAUTH.basePath}`
}

It works, but it seems silly not give people the option to do this by default? The change is non breaking as the prop is optional.

Is there a reason why it was removed or would you accept a PR?