feat: initial prototype of app

src/utils/checkEntitlement.ts

@@ -0,0 +1,31 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { entitledGuilds } from "../config/entitlements.js";
+import type { Client, Guild } from "discord.js";
+
+/**
+ * Checks if a guild has subscribed.
+ * @param chibika - Chibika's Discord instance.
+ * @param guild - The guild to check.
+ * @returns A boolean indicating whether the guild has an active subscription.
+ */
+const checkGuildEntitlement = async(
+  chibika: Client,
+  guild: Guild,
+): Promise<boolean> => {
+  if (entitledGuilds.includes(guild.id)) {
+    return true;
+  }
+  const entitlements = await chibika.application?.entitlements.fetch({
+    excludeDeleted: true,
+    excludeEnded:   true,
+    guild:          guild,
+  });
+  return Boolean(entitlements && entitlements.size > 0);
+};
+
+export { checkGuildEntitlement };