try fix js input

app.py

@@ -8,10 +8,7 @@ class State:
 state = State()
 
 js = """
-const messageHandler = (event) => {
-    alert('test');
-}
-window.addEventListener('message', messageHandler)
+window.addEventListener('message', (event) => {alert('test')})
 """
 
 def update_values(context, question):