Initial commit

game/traitors.ts

@@ -0,0 +1,23 @@
+import type { Card } from './cards';
+
+export const CHEAP_HERO_TRAITOR = 'cheap-hero-traitor';
+
+export function traitorDeck(
+  players: { leaders: { id: string }[] }[],
+  includeCheapHero = false,
+) {
+  return [
+    ...players.flatMap((p) => p.leaders.map((l) => l.id)),
+    ...(includeCheapHero ? [CHEAP_HERO_TRAITOR] : []),
+  ];
+}
+
+/** A hero card has no faction leader disc; both printed hero cards share one traitor identity. */
+export function matchingTraitor(
+  held: readonly string[],
+  leader: string | null,
+  card?: Card,
+) {
+  const identity = card?.kind === 'hero' ? CHEAP_HERO_TRAITOR : leader;
+  return identity && held.includes(identity) ? identity : undefined;
+}