make games cancellable

src/index.ts

@@ -59,4 +59,8 @@ bot.on(Events.MessageDelete, (msg) => {
   console.log(`${msg.content}`);
 });
 
+process.on('uncaughtException', err => {
+  console.error(err);
+});
+
 bot.login(token);

src/lib/game.ts

@@ -19,12 +19,13 @@ const BAD_EMOJI = '👎';
 
 const DEFAULT_EMOJI = '🪙';
 const STOP_EMOJI = '⏹️';
+const CANCEL_EMOJI = '❌';
 
-function formatMessage(users: User[], time: number, name: string, ended = false) {
+function formatMessage(users: User[], time: number, name: string, ended = false, cancelled = false) {
   return `Starting a **${name}** game (${users.length} player${users.length !== 1 ? 's' : ''})\n`
     + users.map(user => `- ${user.toString()}`).join('\n') + '\n'
     + (time <= 0 ? 
-      (ended ? '**Already ended!**' : '**Already started**') :
+      (cancelled ? ('**Game was cancelled**') : (ended ? '**Already ended!**' : '**Already started**')) :
       `Starting in **${Math.ceil(time / 1000)}s** - react ${STOP_EMOJI} to begin now`
     );
 }
@@ -54,8 +55,6 @@ export async function startGame(interaction: Interaction, startingUser: User, na
   if (!(m instanceof Message)) return;
 
   const emoji = m.guild?.emojis.cache.random();
-  await m.react(emoji || DEFAULT_EMOJI);
-  await m.react(STOP_EMOJI);
 
   const started = Date.now();
   const collector = m.createReactionCollector({
@@ -65,19 +64,29 @@ export async function startGame(interaction: Interaction, startingUser: User, na
           (emoji ? reaction.emoji.id === emoji.id : reaction.emoji.name === DEFAULT_EMOJI) &&
           !participants.find(u => user.id === u.id) &&
           !membersInGame.includes(user.id)
-        ) || (reaction.emoji.name === STOP_EMOJI && user.id === startingUser.id)
+        )
+        || (reaction.emoji.name === STOP_EMOJI && user.id === startingUser.id)
+        || (reaction.emoji.name === CANCEL_EMOJI && user.id === startingUser.id)
       ),
     time: duration,
     dispose: true
   });
 
+  await Promise.all([
+    m.react(emoji || DEFAULT_EMOJI),
+    m.react(STOP_EMOJI),
+    m.react(CANCEL_EMOJI),
+  ]);
+
   const updateInterval = setInterval(() => {
     m.edit(formatMessage(participants, duration - (Date.now() - started), name));
   }, 3_000);
 
   collector.on('collect', (reaction, user) => {
     if (reaction.emoji.name === STOP_EMOJI) {
-      collector.stop();
+      collector.stop('force-started');
+    } else if (reaction.emoji.name === CANCEL_EMOJI) {
+      collector.stop('cancelled');
     } else {
       participants.push(user);
       membersInGame.push(user.id);
@@ -91,13 +100,17 @@ export async function startGame(interaction: Interaction, startingUser: User, na
     m.edit(formatMessage(participants, duration - (Date.now() - started), name));
   });
 
-  collector.on('end', async () => {
+  collector.on('end', async (_, reason) => {
     clearInterval(updateInterval);
-    m.edit(formatMessage(participants, 0, name));
+    await m.reactions.removeAll().catch(error => console.error(error));
 
-    await callback(participants, m.channel);
-
-    m.edit(formatMessage(participants, 0, name, true));
+    if (reason === 'cancelled') {
+      m.edit(formatMessage(participants, 0, name, false, true));
+    } else {
+      m.edit(formatMessage(participants, 0, name));
+      await callback(participants, m.channel);
+      m.edit(formatMessage(participants, 0, name, true));
+    }
     membersInGame = membersInGame.filter(id => !participants.find(u => u.id === id));
   });
 }