Auth middleware is using "signIn" method on server side

[timAdrien]

Environment

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Reproduction

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Describe the bug

I'm using:

  auth: {
    provider: {
      type: 'authjs'
    },
    globalAppMiddleware: true
  }

in nuxt.config.ts

Which means that it enables the default auth middleware:

import { navigateTo, defineNuxtRouteMiddleware, useRuntimeConfig } from "#app";
import { determineCallbackUrl } from "../utils/url.mjs";
import { useAuth } from "#imports";
export default defineNuxtRouteMiddleware((to) => {
 const metaAuth = typeof to.meta.auth === "object" ? {
   unauthenticatedOnly: true,
   ...to.meta.auth
 } : to.meta.auth;
 if (metaAuth === false) {
   return;
 }
 const authConfig = useRuntimeConfig().public.auth;
 const { status, signIn } = useAuth();
 const isGuestMode = typeof metaAuth === "object" && metaAuth.unauthenticatedOnly;
 if (isGuestMode && status.value === "unauthenticated") {
   return;
 }
 if (typeof metaAuth === "object" && !metaAuth.unauthenticatedOnly) {
   return;
 }
 if (status.value === "authenticated") {
   if (isGuestMode) {
     return navigateTo(metaAuth.navigateAuthenticatedTo ?? "/");
   }
   return;
 }
 if (authConfig.globalAppMiddleware.allow404WithoutAuth) {
   const matchedRoute = to.matched.length > 0;
   if (!matchedRoute) {
     return;
   }
 }
 if (authConfig.provider.type === "authjs") {
   const signInOptions = { error: "SessionRequired", callbackUrl: determineCallbackUrl(authConfig, () => to.path) };
   return signIn(void 0, signInOptions);
 } else if (typeof metaAuth === "object" && metaAuth.navigateUnauthenticatedTo) {
   return navigateTo(metaAuth.navigateUnauthenticatedTo);
 } else {
   return navigateTo(authConfig.provider.pages.login);
 }
});

But as you can see there is no "process.server" check before running "signIn" method. And as shown in documentation: https://next-auth.js.org/getting-started/client#signin

this method is client side only.

This causes this error: [nuxt] [request error] [unhandled] [500] Cannot set headers after they are sent to the client

Additional context

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Logs

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[timAdrien]

Wrong project, sorry, opened one on: sidebase/nuxt-auth#537