feat: better error handling

src/index.ts

@@ -1,5 +1,5 @@
 import { Client, GatewayIntentBits } from 'discord.js';
-import cleanup, { EXIT_EVENT_NAMES } from './behaviors/cleanup.js';
+import { registerErrorHandlers } from './behaviors/error.js';
 import guildMemberAdd from './behaviors/guildMemberAdd.js';
 import interactionCreate from './behaviors/interactionCreate.js';
 import ready from './behaviors/ready.js';
@@ -13,12 +13,8 @@ const client = new Client({
   intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMembers],
 });
 
-client.on('error', console.error);
-client.on('ready', ready);
-client.on('guildMemberAdd', guildMemberAdd);
-client.on('interactionCreate', interactionCreate);
-client.login(process.env.DISCORD_TOKEN);
-
-EXIT_EVENT_NAMES.forEach((exitEventName) =>
-  process.on(exitEventName, () => cleanup(client)),
-);
+registerErrorHandlers(client)
+  .on('ready', ready)
+  .on('guildMemberAdd', guildMemberAdd)
+  .on('interactionCreate', interactionCreate)
+  .login(process.env.DISCORD_TOKEN);