authorize.ts throw instead of returning null

src/authorize.ts

@@ -5,18 +5,23 @@ import { phpbb_check_hash } from "@/lib/auth/hash_functions2";
 export default async function authorize(
   credentials: Partial<Record<"password" | "username", unknown>>,
 ) {
-  if (typeof credentials.password !== "string") return null;
-  if (typeof credentials.username !== "string") return null;
+  if (typeof credentials.password !== "string")
+    throw new Error("Invalid credentials.");
+  if (typeof credentials.username !== "string")
+    throw new Error("Invalid credentials.");
+
   let res2 =
     await sql`SELECT * FROM users WHERE LOWER(name) = ${credentials.username.toLowerCase() || ""} AND activated`;
+
   if (res2.length === 0) {
-    return null;
+    throw new Error("Invalid credentials.");
   }
   let user = res2[0];
 
   let correct = phpbb_check_hash(credentials.password, user.password);
+
   if (!correct) {
-    return null;
+    throw new Error("Invalid credentials.");
   }
 
   return {