Adding ability to listen to user types chat messages using WA.onChatMessage

front/src/Api/Events/UserInputChatEvent.ts

@@ -0,0 +1,10 @@
+import * as tg from "generic-type-guard";
+
+export const isUserInputChatEvent =
+    new tg.IsInterface().withProperties({
+        message: tg.isString,
+    }).get();
+/**
+ * A message sent from the game to the iFrame when a user types a message in the chat.
+ */
+export type UserInputChatEvent = tg.GuardedType<typeof isUserInputChatEvent>;