feat: Add server check in middleware (#644)

Author: zoey-kaiser

src/runtime/middleware/auth.ts

@@ -85,6 +85,10 @@ export default defineNuxtRouteMiddleware((to) => {
   }
 
   if (authConfig.provider.type === 'authjs') {
+    // If the middleware runs on a pre-render of the route, do not call signIn, as this is a client method
+    if (process.server) {
+      return
+    }
     const signInOptions: Parameters<typeof signIn>[1] = { error: 'SessionRequired', callbackUrl: determineCallbackUrl(authConfig, () => to.path) }
     // @ts-ignore This is valid for a backend-type of `authjs`, where sign-in accepts a provider as a first argument
     return signIn(undefined, signInOptions) as ReturnType<typeof navigateToAuthPages>