typescript on both client and server with communication via socket.io

lib/GameStore.ts

@@ -0,0 +1,70 @@
+import Cards from './Cards'
+
+import { GameState } from '../types'
+
+const deck = new Cards();
+
+export default class GameStore {
+  private games: Map<string, GameState>;
+
+  constructor() {
+    this.games = new Map();
+  }
+
+  createGame(id: string): GameState {
+    if (this.games.has(id)) throw new Error(`Game ${id} already exists`);
+
+    const newGame: GameState = {
+      id,
+      players: new Set(),
+      cards: deck.select(5).map(card => ({ ...card, flipped: false })),
+      lastUpdated: Date.now(),
+    };
+
+    this.games.set(id, newGame);
+
+    return newGame;
+  }
+
+  joinGame(gameID: string, playerID: string): GameState {
+    const game = this.games.get(gameID) || this.createGame(gameID);
+
+    game.players.add(playerID);
+    game.lastUpdated = Date.now();
+
+    return game;
+  }
+
+  leaveGame(gameID: string, playerID: string): GameState {
+    const game = this.getGame(gameID);
+
+    game.players.delete(playerID);
+    game.lastUpdated = Date.now();
+
+    return game;
+  }
+
+  flipCard(gameID: string, cardID: string): GameState {
+    const game = this.getGame(gameID);
+    const card = game.cards.find(c => c.id === cardID);
+
+    if (!card) throw new Error(`Card ${cardID} not found`);
+
+    card.flipped = !card.flipped;
+    game.lastUpdated = Date.now();
+
+    return game;
+  }
+
+  getGame(gameID: string): GameState {
+    const game = this.games.get(gameID);
+
+    if (!game) throw new Error(`Game ${gameID} not found`);
+
+    return game;
+  }
+
+  deleteGame(gameID: string): void {
+    this.games.delete(gameID);
+  }
+}