meta: enable stricter type checking

src/commands/ban.ts

@@ -13,9 +13,14 @@ export function command (message: discord.Message) {
     state.logChannel.send(`${message.author.toString()} has banned ${user} ${user.toString()} [${count}].`);
 
     state.bans.push(new UserBan(user.id, user.username, message.author.id, message.author.username, count));
-
-    message.guild.member(user).ban().catch(function (error) {
-      state.logChannel.send(`Error banning ${user} ${user.username}`);
+    let member = message.guild?.member(user);
+    if (!member) {
+      state.logChannel.send(`Error banning ${user} ${user.username}: user not found.`);
+      logger.error(`User not found: ${user.toString()} ${user} ${user.username} when executing a ban`);
+      // we don't need a return here, because of the optional chaining below
+    }
+    member?.ban().catch(function (error) {
+      state.logChannel.send(`Error banning ${user.toString()} ${user.username}`);
       logger.error(`Error banning ${user.toString()} ${user} ${user.username}.`, error);
     });
 

src/commands/game.ts

@@ -23,6 +23,11 @@ const compatStrings: ICompatList = {
 
 async function updateDatabase () {
   let body;
+  if (!targetServer) {
+    logger.error('Unable to download latest games list!');
+    return;
+  }
+
   try {
     let response = await fetch(targetServer);
     body = await response.json();
@@ -50,7 +55,7 @@ export async function command (message: discord.Message) {
     // Update remote list of games locally.
     const waitMessage = message.channel.send('This will take a second...');
 
-    if (state.gameDBPromise == null) {
+    if (!state.gameDBPromise) {
       state.gameDBPromise = updateDatabase();
     }
 
@@ -68,16 +73,18 @@ export async function command (message: discord.Message) {
   const game = message.content.substr(message.content.indexOf(' ') + 1);
 
   // Search all games. This is only linear time, so /shrug?
-  let bestGame: IGameDBEntry;
+  let bestGame: IGameDBEntry | null = null;
   let bestScore = 0.5; // Game names must have at least a 50% similarity to be matched
 
-  state.gameDB.forEach(testGame => {
+  // for is faster than forEach
+  for (let index = 0; index < state.gameDB.length; index++) {
+    const testGame = state.gameDB[index];
     const newDistance = stringSimilarity.compareTwoStrings(game.toLowerCase(), testGame.title.toLowerCase());
     if (newDistance > bestScore) {
       bestGame = testGame;
       bestScore = newDistance;
     }
-  });
+  }
 
   if (!bestGame) {
     message.channel.send('Game could not be found.');

src/commands/grantDeveloper.ts

@@ -5,19 +5,30 @@ import discord = require('discord.js');
 export const roles = ['Admins', 'Moderators', 'CitraBot'];
 export function command (message: discord.Message) {
   const role = process.env.DISCORD_DEVELOPER_ROLE;
+
+  if (!role) {
+    logger.error('DISCORD_DEVELOPER_ROLE suddenly became undefined?!');
+    return;
+  }
+
   message.mentions.users.map((user) => {
-    const member = message.guild.member(user);
-    const alreadyJoined = member.roles.cache.has(role);
+    const member = message.guild?.member(user);
+    const alreadyJoined = member?.roles.cache.has(role);
+
+    if (!member) {
+      message.channel.send(`User ${user.toString()} was not found in the channel.`);
+      return;
+    }
 
     if (alreadyJoined) {
-      member.roles.remove(role).then(() => {
+      member?.roles.remove(role).then(() => {
         message.channel.send(`${user.toString()}'s speech has been revoked in the #development channel.`);
       }).catch(() => {
         state.logChannel.send(`Error revoking ${user.toString()}'s developer speech...`);
         logger.error(`Error revoking ${user} ${user.username}'s developer speech...`);
       });
     } else {
-      member.roles.add(role).then(() => {
+      member?.roles.add(role).then(() => {
         message.channel.send(`${user.toString()} has been granted speech in the #development channel.`);
       }).catch(() => {
         state.logChannel.send(`Error granting ${user.toString()}'s developer speech...`);

src/models/interfaces.ts

@@ -1,3 +1,5 @@
+import { Message } from 'discord.js';
+
 export interface IGameDBEntry {
     directory: string;
     title: string;
@@ -14,8 +16,13 @@ export interface ICompatList {
 }
 
 export interface IResponses {
-    pmReply: string,
-    quotes: {
-        [key: string]: { reply: string }
+    readonly pmReply: string,
+    readonly quotes: {
+        readonly [key: string]: { readonly reply: string }
     }
 }
+
+export interface IModule {
+    readonly roles?: string[],
+    command: (message: Message, args: string) => void | Promise<void>
+}

src/server.ts

@@ -18,10 +18,17 @@ interface IModuleMap {
 
 let cachedModules: IModuleMap = {};
 const client = new discord.Client();
-
+const rulesTrigger = process.env.DISCORD_RULES_TRIGGER;
+const rluesRole = process.env.DISCORD_RULES_ROLE;
 const mediaUsers = new Map();
 
 logger.info('Application startup. Configuring environment.');
+if (!rulesTrigger) {
+  throw new Error('DISCORD_RULES_TRIGGER somehow became undefined.');
+}
+if (!rluesRole) {
+  throw new Error('DISCORD_RULES_ROLE somehow became undefined.');
+}
 
 function findArray(haystack: string | any[], arr: any[]) {
   return arr.some(function (v: any) {
@@ -36,6 +43,9 @@ function IsIgnoredCategory(categoryName: string) {
 
 client.on('ready', async () => {
   // Initialize app channels.
+  if (!process.env.DISCORD_LOG_CHANNEL || !process.env.DISCORD_MSGLOG_CHANNEL) {
+    throw new Error('DISCORD_LOG_CHANNEL or DISCORD_MSGLOG_CHANNEL not defined.');
+  }
   let logChannel = await client.channels.fetch(process.env.DISCORD_LOG_CHANNEL) as discord.TextChannel;
   let msglogChannel = await client.channels.fetch(process.env.DISCORD_MSGLOG_CHANNEL) as discord.TextChannel;
   if (!logChannel.send) throw new Error('DISCORD_LOG_CHANNEL is not a text channel!');
@@ -62,15 +72,16 @@ client.on('disconnect', () => {
 });
 
 client.on('guildMemberAdd', (member) => {
+  if (process.env.DISCORD_RULES_ROLE)
     member.roles.add(process.env.DISCORD_RULES_ROLE);
 });
 
 client.on('messageDelete', message => {
   let parent = (message.channel as discord.TextChannel).parent;
   if (parent && IsIgnoredCategory(parent.name) === false) {
-    if (message.content && message.content.startsWith('.') === false && message.author.bot === false) {
+    if (message.content && message.content.startsWith('.') === false && message.author?.bot === false) {
       const deletionEmbed = new discord.MessageEmbed()
-        .setAuthor(message.author.tag, message.author.displayAvatarURL())
+        .setAuthor(message.author?.tag, message.author?.displayAvatarURL())
         .setDescription(`Message deleted in ${message.channel.toString()}`)
         .addField('Content', message.cleanContent, false)
         .setTimestamp()
@@ -84,14 +95,19 @@ client.on('messageDelete', message => {
 
 client.on('messageUpdate', (oldMessage, newMessage) => {
   const AllowedRoles = ['Administrators', 'Moderators', 'Team', 'VIP'];
-  if (!findArray(oldMessage.member.roles.cache.map(x => x.name), AllowedRoles)) {
+  let authorRoles = oldMessage.member?.roles?.cache?.map(x => x.name);
+  if (!authorRoles) {
+    logger.error(`Unable to get the roles for ${oldMessage.author}`);
+    return;
+  }
+  if (!findArray(authorRoles, AllowedRoles)) {
     let parent = (oldMessage.channel as discord.TextChannel).parent;
     if (parent && IsIgnoredCategory(parent.name) === false) {
       const oldM = oldMessage.cleanContent;
       const newM = newMessage.cleanContent;
       if (oldMessage.content !== newMessage.content && oldM && newM) {
         const editedEmbed = new discord.MessageEmbed()
-          .setAuthor(oldMessage.author.tag, oldMessage.author.displayAvatarURL())
+          .setAuthor(oldMessage.author?.tag, oldMessage.author?.displayAvatarURL())
           .setDescription(`Message edited in ${oldMessage.channel.toString()} [Jump To Message](${newMessage.url})`)
           .addField('Before', oldM, false)
           .addField('After', newM, false)
@@ -99,7 +115,7 @@ client.on('messageUpdate', (oldMessage, newMessage) => {
           .setColor('GREEN');
 
         state.msglogChannel.send(editedEmbed);
-        logger.info(`${oldMessage.author.username} ${oldMessage.author} edited message from: ${oldM} to: ${newM}.`);
+        logger.info(`${oldMessage.author?.username} ${oldMessage.author} edited message from: ${oldM} to: ${newM}.`);
       }
     }
   }
@@ -118,9 +134,15 @@ client.on('message', message => {
 
   logger.verbose(`${message.author.username} ${message.author} [Channel: ${(message.channel as discord.TextChannel).name} ${message.channel}]: ${message.content}`);
 
+  let authorRoles = message.member?.roles?.cache?.map(x => x.name);
+
   if (message.channel.id === process.env.DISCORD_MEDIA_CHANNEL && !message.author.bot) {
     const AllowedMediaRoles = ['Administrators', 'Moderators', 'Team', 'VIP'];
-    if (!findArray(message.member.roles.cache.map(x => x.name), AllowedMediaRoles)) {
+    if (!authorRoles) {
+      logger.error(`Unable to get the roles for ${message.author}`);
+      return;
+    }
+    if (!findArray(authorRoles, AllowedMediaRoles)) {
       const urlRegex = new RegExp(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_+.~#?&//=]*)/gi);
       if (message.attachments.size > 0 || message.content.match(urlRegex)) {
         mediaUsers.set(message.author.id, true);
@@ -135,10 +157,10 @@ client.on('message', message => {
 
   // Check if the channel is #rules, if so we want to follow a different logic flow.
   if (message.channel.id === process.env.DISCORD_RULES_CHANNEL) {
-    if (message.content.toLowerCase().includes(process.env.DISCORD_RULES_TRIGGER)) {
+    if (message.content.toLowerCase().includes(rulesTrigger)) {
       // We want to remove the 'Unauthorized' role from them once they agree to the rules.
       logger.verbose(`${message.author.username} ${message.author} has accepted the rules, removing role ${process.env.DISCORD_RULES_ROLE}.`);
-      message.member.roles.remove(process.env.DISCORD_RULES_ROLE, 'Accepted the rules.');
+      message.member?.roles.remove(rluesRole, 'Accepted the rules.');
     }
 
     // Delete the message in the channel to force a cleanup.
@@ -155,7 +177,11 @@ client.on('message', message => {
     if (!cachedModule && !quoteResponse) return; // Not a valid command.
 
     // Check access permissions.
-    if (cachedModule && cachedModule.roles && !findArray(message.member.roles.cache.map(x => x.name), cachedModule.roles)) {
+    if (!authorRoles) {
+      logger.error(`Unable to get the roles for ${message.author}`);
+      return;
+    }
+    if (cachedModule && cachedModule.roles && !findArray(authorRoles, cachedModule.roles)) {
       state.logChannel.send(`${message.author.toString()} attempted to use admin command: ${message.content}`);
       logger.info(`${message.author.username} ${message.author} attempted to use admin command: ${message.content}`);
       return;
@@ -168,7 +194,7 @@ client.on('message', message => {
       if (!!cachedModule) {
         cachedModule.command(message);
       } else if (cachedModules['quote']) {
-        cachedModules['quote'].command(message, quoteResponse.reply);
+        cachedModules['quote'].command(message, quoteResponse?.reply);
       }
     } catch (err) { logger.error(err); }
 

src/state.ts

@@ -13,13 +13,13 @@ class State {
   stats: { joins: number; ruleAccepts: number; leaves: number; warnings: number; };
   lastGameDBUpdate: number;
   gameDB: IGameDBEntry[];
-  gameDBPromise: Promise<void>;
+  gameDBPromise: Promise<void> | null;
 
   constructor () {
-    this.logChannel = null;
-    this.msglogChannel = null;
+    this.logChannel;
+    this.msglogChannel;
     this.warnings = [];
-    this.responses = null;
+    this.responses;
     this.bans = [];
     this.stats = {
       joins: 0,

tsconfig.json

@@ -2,6 +2,7 @@
     "compilerOptions": {
         "module": "CommonJS",
         "noImplicitAny": true,
+        "strictNullChecks": true,
         "removeComments": true,
         "preserveConstEnums": true,
         "outDir": "dist/",