Progress so far

app/api/auth/[...nextauth]/options.ts

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+import type { NextAuthOptions } from "next-auth";
+import TwitchProvider from "next-auth/providers/twitch";
+
+export interface TwitchProfile extends Record<string, any> {
+  sub: string
+  preferred_username: string
+  email: string
+  picture: string
+}
+
+export const options: NextAuthOptions = {
+  providers: [
+    TwitchProvider({
+      clientId: process.env.TWITCH_CLIENT_ID as string,
+      clientSecret: process.env.TWITCH_CLIENT_SECRET as string,
+      authorization: {
+        params: {
+          scope: "openid user:read:email",
+          claims: {
+            id_token: {
+              email: null,
+              picture: null,
+              preferred_username: null,
+            },
+          },
+        },
+      },
+      idToken: true,
+      profile(profile) {
+        return {
+          id: profile.sub,
+          name: profile.preferred_username,
+          email: profile.email,
+          image: profile.picture,
+        }
+      },
+    })
+  ],
+  secret: process.env.NEXTAUTH_SECRET
+}

app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,6 @@
+import NextAuth from 'next-auth'
+import { options } from './options'
+
+const handler = NextAuth(options)
+
+export { handler as GET, handler as POST }