first commit

src/games/onecard/history.ts

@@ -0,0 +1,11 @@
+import type { GameAction } from './types'
+
+export function pushAction(history: GameAction[], action: GameAction): GameAction[] {
+  return [...history, action]
+}
+
+export function popAction(history: GameAction[]): { action: GameAction | null; history: GameAction[] } {
+  if (history.length === 0) return { action: null, history }
+  const action = history[history.length - 1]!
+  return { action, history: history.slice(0, -1) }
+}