Working

src/routes/auth/+page.svelte

@@ -0,0 +1,12 @@
+<form method="POST" action="?/login">
+  <label>
+    Email
+    <input name="email" type="email" />
+  </label>
+  <label>
+    Password
+    <input name="password" type="password" />
+  </label>
+  <button>Login</button>
+  <button formaction="?/signup">Sign up</button>
+</form>