add exit code to game close event

source/funkin/modding/IScriptedClass.hx

@@ -212,5 +212,5 @@ interface IGlobalScriptedClass extends IPlayStateScriptedClass extends IStateCha
    * Called when the game is closed for any reason.
    * This event is only called once.
    */
-  public function onGameClose(event:ScriptEvent):Void;
+  public function onGameClose(event:GameCloseScriptEvent):Void;
 }

source/funkin/modding/events/ScriptEvent.hx

@@ -512,3 +512,20 @@ class PauseScriptEvent extends ScriptEvent
     this.gitaroo = gitaroo;
   }
 }
+
+/**
+ * An event which is called when the game is closed for any reason.
+ */
+class GameCloseScriptEvent extends ScriptEvent
+{
+  /**
+   * The exit code. Any non-zero value is likely an error.
+   */
+  public var exitCode(default, null):Int;
+
+  public function new(exitCode:Int):Void
+  {
+    super(GAME_CLOSE, false);
+    this.exitCode = exitCode;
+  }
+}

source/funkin/modding/events/ScriptEventDispatcher.hx

@@ -201,7 +201,7 @@ class ScriptEventDispatcher
           t.onGameInit(event);
           return;
         case GAME_CLOSE:
-          t.onGameClose(event);
+          t.onGameClose(cast event);
           return;
         default: // Continue;
       }

source/funkin/modding/module/Module.hx

@@ -68,7 +68,7 @@ class Module implements IGlobalScriptedClass
    * Called when the game is closed for any reason.
    * This happens only once, immediately before the module's last `onDestroy` event.
    */
-  public function onGameClose(event:ScriptEvent) {}
+  public function onGameClose(event:GameCloseScriptEvent) {}
 
   /**
    * Called when the module is created.

source/funkin/modding/module/ModuleHandler.hx

@@ -162,6 +162,6 @@ class ModuleHandler
 
   public static inline function callOnGameClose(exitCode:Int):Void
   {
-    callEvent(new ScriptEvent(GAME_CLOSE, false));
+    callEvent(new GameCloseScriptEvent(exitCode));
   }
 }