housekeeping

packages/shared/types/cards.ts

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+const suits = ["heart", "diamond", "spade", "club"] as const;
+export type Suit = (typeof suits)[number];
+
+const ranks = [
+	2,
+	3,
+	4,
+	5,
+	6,
+	7,
+	8,
+	9,
+	10,
+	"jack",
+	"queen",
+	"king",
+	"ace",
+] as const;
+export type Rank = (typeof ranks)[number];
+
+export type Card =
+	| {
+			kind: "normal";
+			suit: Suit;
+			rank: Rank;
+	  }
+	| { kind: "joker"; color: "red" | "black" };
+
+export type Pile = Card[];
+export type Stack = Card[];
+export type Hand = Card[];
+export type Board = Card[];
+
+export const newDeck = (withJokers = false): Pile =>
+	suits
+		.map((suit) =>
+			ranks.map((rank) => ({ kind: "normal", suit, rank } as Card))
+		)
+		.flat()
+		.concat(
+			withJokers
+				? [
+						{ kind: "joker", color: "red" },
+						{ kind: "joker", color: "black" },
+				  ]
+				: []
+		);
+
+export const shuffle = (cards: Card[]) => {
+	let i = cards.length;
+	while (i > 0) {
+		const j = Math.floor(Math.random() * i);
+		i--;
+		[cards[i], cards[j]] = [cards[j], cards[i]];
+	}
+	return cards;
+};
+
+export type GameState = {
+	deck: Pile;
+	hand: Hand;
+};
+export const newGame = () =>
+	({
+		deck: shuffle(newDeck()),
+		hand: [],
+	} as GameState);