refactor(handlers): move conditional logic into handler files

src/handlers/handle-interaction-creation.ts

@@ -0,0 +1,21 @@
+import type { Interaction } from 'discord.js';
+
+import { createLobby } from '../create-lobby';
+
+export const handleInteractionCreation = async (interaction: Interaction): Promise<void> => {
+  if (
+    !interaction.isCommand() ||
+    !interaction.inGuild() ||
+    !interaction.isChatInputCommand() ||
+    interaction.commandName !== 'voice-on-demand'
+  ) {
+    return;
+  }
+
+  if (interaction.options.getSubcommand(true) !== 'create') {
+    await interaction.reply('Unknown subcommand');
+    return;
+  }
+
+  await createLobby(interaction);
+};

src/handlers/handle-voice-channel-deletion.ts

@@ -1,8 +1,15 @@
-import type { VoiceChannel } from 'discord.js';
+import type { DMChannel, NonThreadGuildBasedChannel } from 'discord.js';
+import { ChannelType } from 'discord.js';
 
 import { cache } from '../helpers/cache';
 
-export const handleVoiceChannelDeletion = async (channel: VoiceChannel): Promise<void> => {
+export const handleVoiceChannelDeletion = async (
+  channel: DMChannel | NonThreadGuildBasedChannel
+): Promise<void> => {
+  if (channel.type !== ChannelType.GuildVoice) {
+    return;
+  }
+
   const lobbyId = await cache.get('lobbyId');
 
   const { guild, id } = channel;

src/handlers/voice-state-handlers.ts → src/handlers/handle-voice-state-update.ts

@@ -6,13 +6,13 @@ import { cache } from '../helpers/cache';
 
 type CheckedVoiceState = SetNonNullable<VoiceState, 'channel' | 'channelId' | 'member'>;
 
-export const isJoinState = (newState: VoiceState): newState is CheckedVoiceState =>
+const isJoinState = (newState: VoiceState): newState is CheckedVoiceState =>
   newState.channel !== null && newState.channelId !== null && newState.member !== null;
 
-export const isLeaveState = (oldDate: VoiceState): oldDate is CheckedVoiceState =>
+const isLeaveState = (oldDate: VoiceState): oldDate is CheckedVoiceState =>
   oldDate.channel !== null && oldDate.channelId !== null && oldDate.member !== null;
 
-export const handleJoin = async (state: CheckedVoiceState, lobbyId: string): Promise<void> => {
+const handleJoin = async (state: CheckedVoiceState, lobbyId: string): Promise<void> => {
   if (state.channelId !== lobbyId) {
     return;
   }
@@ -21,7 +21,7 @@ export const handleJoin = async (state: CheckedVoiceState, lobbyId: string): Pro
   await state.member.voice.setChannel(channel);
 };
 
-export const handleLeave = async (state: CheckedVoiceState): Promise<void> => {
+const handleLeave = async (state: CheckedVoiceState): Promise<void> => {
   const channels = await cache.get('channels', []);
 
   const { channel } = state;
@@ -35,3 +35,21 @@ export const handleLeave = async (state: CheckedVoiceState): Promise<void> => {
     await cache.set('channels', filtered);
   }
 };
+
+export const handleVoiceStateUpdate = async (
+  oldState: VoiceState,
+  newState: VoiceState
+): Promise<void> => {
+  const lobbyId = await cache.get('lobbyId');
+  if (lobbyId === undefined) {
+    return;
+  }
+
+  if (isLeaveState(oldState)) {
+    await handleLeave(oldState);
+  }
+
+  if (isJoinState(newState)) {
+    await handleJoin(newState, lobbyId);
+  }
+};

src/main.ts

@@ -1,17 +1,11 @@
-import { ChannelType, Client, REST, Routes } from 'discord.js';
+import { Client, REST, Routes } from 'discord.js';
 
+import { voiceOnDemandCommand } from './commands';
 import { config } from './config';
-import { createLobby } from './create-lobby';
 import { deleteExistingCommands } from './delete-existing-commands';
+import { handleInteractionCreation } from './handlers/handle-interaction-creation';
 import { handleVoiceChannelDeletion } from './handlers/handle-voice-channel-deletion';
-import {
-  handleJoin,
-  handleLeave,
-  isJoinState,
-  isLeaveState,
-} from './handlers/voice-state-handlers';
-import { cache } from './helpers/cache';
-import { voiceOnDemandCommand } from './commands';
+import { handleVoiceStateUpdate } from './handlers/handle-voice-state-update';
 
 const { discord } = config;
 
@@ -36,42 +30,15 @@ const client = new Client({
 await bootstrap(client);
 
 client.on('channelDelete', async (channel) => {
-  if (channel.type === ChannelType.GuildVoice) {
-    await handleVoiceChannelDeletion(channel);
-  }
+  await handleVoiceChannelDeletion(channel);
 });
 
 client.on('voiceStateUpdate', async (oldState, newState) => {
-  const lobbyId = await cache.get('lobbyId');
-  if (lobbyId === undefined) {
-    return;
-  }
-
-  if (isLeaveState(oldState)) {
-    await handleLeave(oldState);
-  }
-
-  if (isJoinState(newState)) {
-    await handleJoin(newState, lobbyId);
-  }
+  await handleVoiceStateUpdate(oldState, newState);
 });
 
 client.on('interactionCreate', async (interaction) => {
-  if (
-    !interaction.isCommand() ||
-    !interaction.inGuild() ||
-    !interaction.isChatInputCommand() ||
-    interaction.commandName !== 'voice-on-demand'
-  ) {
-    return;
-  }
-
-  if (interaction.options.getSubcommand(true) !== 'create') {
-    await interaction.reply('Unknown subcommand');
-    return;
-  }
-
-  await createLobby(interaction);
+  await handleInteractionCreation(interaction);
 });
 
 const rest = new REST({ version: '10' }).setToken(discord.token);