refactor: extend auth.js types globally (resolves #7)

src/app.d.ts

@@ -1,3 +1,5 @@
+import { DefaultSession } from '@auth/sveltekit';
+
 // See https://svelte.dev/docs/kit/types#app.d.ts
 // for information about these interfaces
 declare global {
@@ -10,4 +12,13 @@ declare global {
 	}
 }
 
+declare module '@auth/sveltekit' {
+	interface Session {
+		user: {
+			id: string;
+			email: string;
+		} & DefaultSession['user'];
+	}
+}
+
 export {};

src/lib/auth.ts

@@ -1,4 +1,4 @@
-import type { Session, User } from '@auth/sveltekit';
+import type { Session } from '@auth/sveltekit';
 import { error } from '@sveltejs/kit';
 import { db } from './server/db';
 import { users } from './server/db/schema';
@@ -8,21 +8,17 @@ interface Event {
 		auth(): Promise<Session | null>;
 	};
 }
-interface UserWithId extends User {
-	id: string;
-	email: string;
-}
 
-export async function ensureAuth(event: Event): Promise<UserWithId> {
+export async function ensureAuth(event: Event): Promise<Session['user']> {
 	const session = await getSession(event);
 	if (!session) error(401, { message: 'Du muesch di zersch iiloge' });
 
-	const user = session?.user;
+	const user = session.user;
 	if (!user || !user.email || !user.id) {
 		error(401, { message: 'Du muesch di zersch iiloge' });
 	}
 
-	return { ...user, id: user.id, email: user.email }; // weird thingamajig so that ts compiler is happy
+	return user;
 }
 export async function getSession(event: Event) {
 	const session = await event.locals.auth();