This was SVN commit r2159.

source/scripting/EventTypes.h

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+// EventTypes.h
+// Script event declarations
+
+enum EEventType
+{
+	// Entity events
+	EVENT_INITIALIZE = 0,
+	EVENT_TICK,
+	EVENT_ATTACK,
+	EVENT_GATHER,
+	EVENT_DAMAGE,
+	EVENT_TARGET_CHANGED,
+	EVENT_PREPARE_ORDER,
+	EVENT_ORDER_TRANSITION,
+	EVENT_LAST,
+	// General events
+	EVENT_GAME_START = 0,
+	EVENT_GAME_TICK,
+	EVENT_SELECTION_CHANGED,
+};
+
+// Only used for entity events...
+static const wchar_t* EventNames[] =
+{
+	/* EVENT_INITIALIZE */ L"onInitialize",
+	/* EVENT_TICK */ L"onTick",
+	/* EVENT_ATTACK */ L"onAttack", /* This unit is the one doing the attacking... */
+	/* EVENT_GATHER */ L"onGather", /* This unit is the one doing the gathering... */
+	/* EVENT_DAMAGE */ L"onTakesDamage",
+	/* EVENT_TARGET_CHANGED */ L"onTargetChanged", /* If this unit is selected and the mouseover object changes */
+	/* EVENT_PREPARE_ORDER */ L"onPrepareOrder", /* To check if a unit can execute a given order */
+	/* EVENT_ORDER_TRANSITION */ L"onOrderTransition" /* When we change orders (sometimes...) */
+};

source/scripting/GameEvents.h

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+// GameEvents.h
+
+// A class that exists to let scripts know when important things happen
+// in the game.
+
+#ifndef GAME_EVENTS_INCLUDED
+#define GAME_EVENTS_INCLUDED
+
+#include "DOMEvent.h"
+
+class CGameEvents : public IEventTarget, public Singleton<CGameEvents>
+{
+	// Game events don't really run on an object
+	JSObject* GetScriptExecContext( IEventTarget* target ) { return( g_ScriptingHost.GetGlobalObject() ); }
+
+	// Some events
+	class CEventSelectionChanged : public CScriptEvent
+	{
+		bool m_CausedByPlayer;
+	public:
+		CEventSelectionChanged( bool CausedByPlayer ) : CScriptEvent( L"selectionChanged", EVENT_SELECTION_CHANGED, false )
+		{
+			AddLocalProperty( L"byPlayer", &m_CausedByPlayer, true );
+		}
+	};
+
+public:
+	void FireSelectionChanged( bool CausedByPlayer )
+	{
+		CEventSelectionChanged evt( CausedByPlayer );
+		DispatchEvent( &evt );
+	}
+};
+
+#define g_JSGameEvents CGameEvents::GetSingleton()
+
+#endif