types for client/server interaction

app/[gameID]/page.tsx

@@ -6,37 +6,48 @@ import { socket } from "@/socket";
 
 import Card from '@/components/Card';
 
-import type { GameCard } from '@/types';
+import type { GameCard, GameUpdate, ClientUpdate } from '@/types';
 
 export default function GamePage() {
-  const { gameID } = useParams();
+  const { gameID: gameIDParam } = useParams();
 
+  const [gameID, setGameID] = useState('');
   const [cards, setCards] = useState<GameCard[]>([]);
 
   useEffect(() => {
+    if (gameIDParam) {
+      setGameID(Array.isArray(gameIDParam) ? gameIDParam[0] : gameIDParam);
+    }
+  }, [gameIDParam])
+
+  useEffect(() => {
+    if (gameID) {
       socket.emit('join', gameID);
 
-    socket.on('init', data => {
+      socket.on('init', (data: GameUpdate) => {
         console.log('init', data);
         setCards(data.cards);
       });
 
-    socket.on('card-flipped', (data) => {
+      socket.on('card-flipped', (data: GameUpdate) => {
         console.log('>>>', data);
         setCards(data.cards);
       });
+    }
 
-    return () => {
+    return gameID ? () => {
       socket.off('init');
       socket.off('card-flipped');
-    };
+    } : undefined;
-  }, []);
+  }, [gameID]);
 
   const flipCard = (cardID: string) => {
-    socket.emit('flip-card', {
+    const flip: ClientUpdate = {
-      cardID,
       gameID,
-    });
+      cardID,
+    };
+
+    socket.emit('flip-card', flip);
   };
 
   return cards.length ? (

lib/GameStore.ts

@@ -1,6 +1,6 @@
 import Cards from './Cards'
 
-import { GameState } from '../types'
+import { GameState, GameUpdate } from '../types'
 
 const deck = new Cards();
 
@@ -26,13 +26,13 @@ export default class GameStore {
     return newGame;
   }
 
-  joinGame(gameID: string, playerID: string): GameState {
+  joinGame(gameID: string, playerID: string): GameUpdate {
     const game = this.games.get(gameID) || this.createGame(gameID);
 
     game.players.add(playerID);
     game.lastUpdated = Date.now();
 
-    return game;
+    return this.gameUpdate(game);
   }
 
   leaveGame(gameID: string, playerID: string): GameState {
@@ -44,7 +44,7 @@ export default class GameStore {
     return game;
   }
 
-  flipCard(gameID: string, cardID: string): GameState {
+  flipCard(gameID: string, cardID: string): GameUpdate {
     const game = this.getGame(gameID);
     const card = game.cards.find(c => c.id === cardID);
 
@@ -53,7 +53,7 @@ export default class GameStore {
     card.flipped = !card.flipped;
     game.lastUpdated = Date.now();
 
-    return game;
+    return this.gameUpdate(game);
   }
 
   getGame(gameID: string): GameState {
@@ -64,6 +64,11 @@ export default class GameStore {
     return game;
   }
 
+  gameUpdate(game: GameState): GameUpdate {
+    const { id, cards } = game;
+    return { id, cards };
+  }
+
   deleteGame(gameID: string): void {
     this.games.delete(gameID);
   }

server.ts

@@ -3,6 +3,7 @@ import { createServer } from 'http';
 import { Server as SocketIOServer, type Socket } from 'socket.io';
 
 import GameStore from './lib/GameStore';
+import type { ClientUpdate } from './types';
 
 const dev = process.env.NODE_ENV !== 'production';
 const hostname = 'localhost';
@@ -24,17 +25,19 @@ app.prepare().then(() => {
 
     socket.on('join', (gameID) => {
       socket.join(gameID);
-      const game = gameStore.joinGame(gameID, socket.id);
+      const gameUpdate = gameStore.joinGame(gameID, socket.id);
 
       console.log(`Socket ${socket.id} joined game ${gameID}`)
 
-      socket.emit('init', { cards: game.cards });
+      socket.emit('init', gameUpdate);
     })
 
-    socket.on('flip-card', ({ gameID, cardID }) => {
+    socket.on('flip-card', ({ gameID, cardID }: ClientUpdate) => {
       console.log('Card flipped:', { gameID, cardID });
-      const game = gameStore.flipCard(gameID, cardID);
+
-      io.to(gameID).emit('card-flipped', { gameID, cards: game.cards });
+      const gameUpdate = gameStore.flipCard(gameID, cardID);
+
+      io.to(gameID).emit('card-flipped', gameUpdate);
     });
 
     socket.on('disconnect', () => {

tsconfig.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es5",
+    "target": "ES2020",
     "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,

types/index.ts

@@ -17,3 +17,13 @@ export interface GameState {
   cards: GameCard[];
   lastUpdated: number;
 }
+
+export interface GameUpdate {
+  id: string;
+  cards: GameCard[];
+}
+
+export interface ClientUpdate {
+  gameID: string;
+  cardID: string;
+}