extract getEventData function

src/routes/Game/hooks/useEventData.ts

@@ -1,11 +1,12 @@
 import { useMemo } from 'react';
 import { useGameState } from '~/hooks/useGame';
 import { Actions } from '~/types/game';
+import { getEventData } from '~/utils/getEventData';
 
 export function useEventData<A extends keyof Actions>(action: A): Actions[A] | null {
   const state = useGameState();
-  return useMemo(() => {
-    if (state.action !== action || state.extra === undefined) return null;
-    return state.extra as Actions[A];
-  }, [action, state]);
+  return useMemo(
+    () => getEventData(action, state),
+    [action, state],
+  );
 }

src/utils/getEventData.ts

@@ -0,0 +1,9 @@
+import { Actions, GameStateExpanded } from '~/types/game';
+
+export function getEventData<A extends keyof Actions>(
+  action: A,
+  state: GameStateExpanded,
+): Actions[A] | null {
+  if (state.action !== action || state.extra === undefined) return null;
+  return state.extra as Actions[A];
+}