refactor: make all GameOptions optional with sensible defaults

- cols defaults to 30 (was required)
- rows defaults to 20 (was required)
- timeLimit and startingLevel remain optional
- Can now call useGame() with no arguments
- Example: useGame(), useGame({}), useGame({ startingLevel: 5 })

example/src/App.tsx

@@ -3,7 +3,7 @@ import "@vimazing/vim-snake/game.css";
 import { useKeyBindings } from "./useKeyBindings";
 
 function App() {
-  const { containerRef, gameStatus, scoreManager, keyLog, score, level } = useGame({ cols: 30, rows: 20 }, useKeyBindings);
+  const { containerRef, gameStatus, scoreManager, keyLog, score, level } = useGame({}, useKeyBindings);
 
   const formatTime = (ms: number) => {
     const seconds = Math.floor(ms / 1000);

src/types.ts

@@ -29,8 +29,8 @@ export type SnakeBody = Position[];
 export type KeyLogEntry = { key: string; timestamp: number };
 
 export type GameOptions = {
-  cols: number;
+  cols?: number;
-  rows: number;
+  rows?: number;
   timeLimit?: number;
   startingLevel?: number;
 };

src/useGame/useGame.ts

@@ -7,8 +7,8 @@ import { useGameStatus } from "../useGameStatus";
 import { useKeyBindings, type UseKeyBindingsType } from "./useKeyBindings";
 import { useScore } from "../useScore";
 
-export function useGame(options: GameOptions, platformHook?: unknown): GameManager {
+export function useGame(options?: GameOptions, platformHook?: unknown): GameManager {
-  const { cols, rows, startingLevel } = options;
+  const { cols = 30, rows = 20, startingLevel } = options ?? {};
 
   const boardManager = useBoard();
   const { containerRef, renderBoard } = boardManager;