chore: simplify next-auth (#80)

auth.ts

@@ -1,64 +1,35 @@
-import NextAuth from 'next-auth'
+import NextAuth, { type DefaultSession } from 'next-auth'
 import GitHub from 'next-auth/providers/github'
-import CredentialsProvider from 'next-auth/providers/credentials'
+import { NextResponse } from 'next/server'
 
-// We default to using GitHub for authentication for local development and production.
-// On Preview deployments, we use a dummy credentials provider. This allows folks to easily
-// test the app without having to create a custom GitHub OAuth app or change the callback URL
-// just to test the application on previews.
+declare module 'next-auth' {
+  interface Session {
+    user: {
+      /** The user's id. */
+      id: string
+    } & DefaultSession['user']
+  }
+}
 
-// We have a custom /sign-in page for non-preview environments. In preview environments, the user
-// will be redirected to /api/auth/signin instead.
 export const {
   handlers: { GET, POST },
   auth,
   CSRF_experimental
-  // @ts-ignore
 } = NextAuth({
-  // @ts-ignore
-  providers: [
-    process.env.VERCEL_ENV === 'preview'
-      ? CredentialsProvider({
-          name: 'Credentials',
-          credentials: {
-            username: {
-              label: 'Username',
-              type: 'text',
-              placeholder: 'jsmith'
-            },
-            password: { label: 'Password', type: 'password' }
-          },
-          async authorize(credentials) {
-            return {
-              id: 1,
-              name: 'J Smith',
-              email: 'jsmith@example.com',
-              picture: 'https://i.pravatar.cc/150?u=jsmith@example.com'
-            } as any
-          }
-        })
-      : GitHub
-  ],
+  providers: [GitHub],
   callbacks: {
-    // @ts-ignore
-    jwt: async ({ token, profile }) => {
-      if (profile?.id) {
+    jwt({ token, profile }) {
+      if (profile) {
         token.id = profile.id
         token.image = profile.picture
       }
       return token
     },
-    // @ts-ignore
     authorized({ auth }) {
       return !!auth?.user
-    },
-    trustHost: true
+    }
   },
-  ...(process.env.VERCEL_ENV === 'preview'
-    ? {}
-    : {
-        pages: {
-          signIn: '/sign-in'
-        }
-      })
+  pages: {
+    signIn: '/sign-in'
+  }
 })