initial convert to TS. No major logic changes, just type safety.

.eslintrc.js

@@ -0,0 +1,29 @@
+module.exports = {
+  root: true,
+  env: {
+    node: true
+  },
+  extends: [
+    'airbnb-base',
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended',
+  ],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: './tsconfig.json',
+    sourceType: 'module'
+  },
+  plugins: ['@typescript-eslint'],
+  settings: {
+    'import/extensions': ['.js', '.ts',],
+    'import/parsers': {
+      '@typescript-eslint/parser': ['.ts']
+    },
+    'import/resolver': {
+      node: {
+        extensions: ['.js', '.ts',]
+      }
+    }
+  }
+}

.gitignore

@@ -65,5 +65,3 @@ config.json
 # error output file
 error.json
 markovDB.json
-.vscode/launch.json
-.vscode/settings.json

.prettierrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+    printWidth: 100,
+    singleQuote: true,
+    trailingComma: 'es5'
+}

.vscode/settings.json

@@ -0,0 +1,18 @@
+{
+    "eslint.validate": [
+        "javascript",
+        "typescript"
+    ],
+    "editor.codeActionsOnSave": {
+        "source.fixAll.eslint": true
+    },
+    "editor.formatOnSave": true,
+    "[javascript]": {
+        "editor.formatOnSave": false,
+    },
+    "[typescript]": {
+        "editor.formatOnSave": false,
+    },
+    "eslint.enable": true,
+    "typescript.tsdk": "node_modules\\typescript\\lib",
+}

index.ts

@@ -1,8 +1,27 @@
-const Discord = require('discord.js'); // https://discord.js.org/#/docs/main/stable/general/welcome
-const fs = require('fs');
-const Markov = require('markov-strings');
-const schedule = require('node-schedule');
-const { version } = require('./package.json');
+/* eslint-disable no-console */
+import * as Discord from 'discord.js';
+// https://discord.js.org/#/docs/main/stable/general/welcome
+import * as fs from 'fs';
+
+import Markov, { MarkovGenerateOptions, MarkovResult } from 'markov-strings';
+
+import * as schedule from 'node-schedule';
+
+interface MessageRecord {
+  id: string;
+  string: string;
+  attachment?: string;
+}
+
+interface MarkbotMarkovResult extends MarkovResult {
+  refs: Array<MessageRecord>;
+}
+
+interface MessagesDB {
+  messages: MessageRecord[];
+}
+
+const version: string = JSON.parse(fs.readFileSync('./package.json', 'utf8')).version || '0.0.0';
 
 const client = new Discord.Client();
 // const ZEROWIDTH_SPACE = String.fromCharCode(parseInt('200B', 16));
@@ -14,15 +33,15 @@ const PAGE_SIZE = 100;
 let GAME = 'GAME';
 let PREFIX = '! ';
 const inviteCmd = 'invite';
-const errors = [];
+const errors: string[] = [];
 
-let fileObj = {
+let fileObj: MessagesDB = {
   messages: [],
 };
 
-let markovDB = [];
-let messageCache = [];
-let deletionCache = [];
+let markovDB: MessageRecord[] = [];
+let messageCache: MessageRecord[] = [];
+let deletionCache: string[] = [];
 const markovOpts = {
   stateSize: 2,
   maxLength: 2000,
@@ -32,27 +51,33 @@ const markovOpts = {
   minScorePerWord: 0,
   maxTries: 10000,
 };
-let markov;
+let markov: Markov;
 // let markov = new Markov(markovDB, markovOpts);
 
-function uniqueBy(arr, propertyName) {
-  const unique = [];
-  const found = {};
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function uniqueBy<Record extends { [key: string]: any }, K extends keyof Record>(
+  arr: Record[],
+  propertyName: K
+): Record[] {
+  const unique: Record[] = [];
+  const found: { [key: string]: boolean } = {};
 
-  for (let i = 0; i < arr.length; i++) {
+  for (let i = 0; i < arr.length; i += 1) {
+    if (arr[i][propertyName]) {
       const value = arr[i][propertyName];
       if (!found[value]) {
         found[value] = true;
         unique.push(arr[i]);
       }
     }
+  }
   return unique;
 }
 
 /**
  * Regenerates the corpus and saves all cached changes to disk
  */
-function regenMarkov() {
+function regenMarkov(): void {
   console.log('Regenerating Markov corpus...');
   try {
     fileObj = JSON.parse(fs.readFileSync('config/markovDB.json', 'utf8'));
@@ -69,20 +94,20 @@ function regenMarkov() {
   }
   // console.log("MessageCache", messageCache)
   markovDB = fileObj.messages;
-  markovDB = uniqueBy(markovDB.concat(messageCache), 'id');
-  deletionCache.forEach((id) => {
+  markovDB = uniqueBy<MessageRecord, 'id'>(markovDB.concat(messageCache), 'id');
+  deletionCache.forEach(id => {
     const removeIndex = markovDB.map(item => item.id).indexOf(id);
     // console.log('Remove Index:', removeIndex)
     markovDB.splice(removeIndex, 1);
   });
   deletionCache = [];
   markov = new Markov(markovDB, markovOpts);
-  markov.buildCorpusSync();
+  markov.buildCorpusAsync();
   fileObj.messages = markovDB;
   // console.log("WRITING THE FOLLOWING DATA:")
   // console.log(fileObj)
   fs.writeFileSync('config/markovDB.json', JSON.stringify(fileObj), 'utf-8');
-  fileObj = null;
+  fileObj.messages = [];
   messageCache = [];
   console.log('Done regenerating Markov corpus.');
 }
@@ -90,7 +115,7 @@ function regenMarkov() {
 /**
  * Loads the config settings from disk
  */
-function loadConfig() {
+function loadConfig(): void {
   // Move config if in legacy location
   if (fs.existsSync('./config.json')) {
     console.log('Copying config.json to new location in ./config');
@@ -102,15 +127,15 @@ function loadConfig() {
     fs.renameSync('./markovDB.json', './config/markovDB.json');
   }
 
-
   try {
-  // eslint-disable-next-line global-require
-    const cfg = require('./config/config.json');
+    const cfg = JSON.parse(fs.readFileSync('./config/config.json', 'utf8'));
     PREFIX = cfg.prefix;
     GAME = cfg.game;
     client.login(cfg.token);
   } catch (e) {
-    console.warn('Failed to use config.json. using default configuration with token environment variable');
+    console.warn(
+      'Failed to use config.json. using default configuration with token environment variable'
+    );
     PREFIX = '!mark';
     GAME = '"!mark help" for help';
     client.login(process.env.TOKEN);
@@ -122,12 +147,14 @@ function loadConfig() {
  * @param {Message} message Message object to get the sender of the message.
  * @return {Boolean} True if the sender is a moderator.
  */
-function isModerator(message) {
+function isModerator(message: Discord.Message): boolean {
   const { member } = message;
-  return member.hasPermission('ADMINISTRATOR')
-  || member.hasPermission('MANAGE_CHANNELS')
-  || member.hasPermission('KICK_MEMBERS')
-  || member.hasPermission('MOVE_MEMBERS');
+  return (
+    member.hasPermission('ADMINISTRATOR') ||
+    member.hasPermission('MANAGE_CHANNELS') ||
+    member.hasPermission('KICK_MEMBERS') ||
+    member.hasPermission('MOVE_MEMBERS')
+  );
 }
 
 /**
@@ -135,7 +162,7 @@ function isModerator(message) {
  * @param {Message} message Message to be interpreted as a command
  * @return {String} Command string
  */
-function validateMessage(message) {
+function validateMessage(message: Discord.Message): string | null {
   const messageText = message.content.toLowerCase();
   let command = null;
   const thisPrefix = messageText.substring(0, PREFIX.length);
@@ -166,20 +193,24 @@ function validateMessage(message) {
  * @param {Message} message Message initiating the command, used for getting
  * channel data
  */
-async function fetchMessages(message) {
-  let historyCache = [];
+async function fetchMessages(message: Discord.Message): Promise<void> {
+  let historyCache: MessageRecord[] = [];
   let keepGoing = true;
-  let oldestMessageID = null;
+  let oldestMessageID;
 
   while (keepGoing) {
+    const messages: Discord.Collection<
+      string,
+      Discord.Message
       // eslint-disable-next-line no-await-in-loop
-    const messages = await message.channel.fetchMessages({
+    > = await message.channel.fetchMessages({
       before: oldestMessageID,
       limit: PAGE_SIZE,
     });
     const nonBotMessageFormatted = messages
-      .filter(elem => !elem.author.bot).map((elem) => {
-        const dbObj = {
+      .filter(elem => !elem.author.bot)
+      .map(elem => {
+        const dbObj: MessageRecord = {
           string: elem.content,
           id: elem.id,
         };
@@ -200,7 +231,6 @@ async function fetchMessages(message) {
   message.reply(`Finished training from past ${historyCache.length} messages.`);
 }
 
-
 /**
  * General Markov-chain response function
  * @param {Message} message The message that invoked the action, used for channel info.
@@ -209,12 +239,17 @@ async function fetchMessages(message) {
  * invoking message.
  * @param {Array<String>} filterWords Array of words that the message generated will be filtered on.
  */
-function generateResponse(message, debug = false, tts = message.tts, filterWords) {
+function generateResponse(
+  message: Discord.Message,
+  debug = false,
+  tts = message.tts,
+  filterWords?: string[]
+): void {
   console.log('Responding...');
-  const options = {};
+  const options: MarkovGenerateOptions = {};
   if (filterWords) {
-    options.filter = (result) => {
-      for (let i = 0; i < filterWords.length; i++) {
+    options.filter = (result): boolean => {
+      for (let i = 0; i < filterWords.length; i += 1) {
         if (result.string.includes(filterWords[i])) {
           return true;
         }
@@ -223,24 +258,31 @@ function generateResponse(message, debug = false, tts = message.tts, filterWords
     };
     options.maxTries = 5000;
   }
-  markov.generateSentence(options).then((result) => {
-    console.log('Generated Result:', result);
-    const messageOpts = { tts };
-    const attachmentRefs = result.refs.filter(ref => Object.prototype.hasOwnProperty.call(ref, 'attachment'));
+  markov
+    .generateAsync(options)
+    .then(result => {
+      const myResult = result as MarkbotMarkovResult;
+      console.log('Generated Result:', myResult);
+      const messageOpts: Discord.MessageOptions = { tts };
+      const attachmentRefs = myResult.refs
+        .filter(ref => Object.prototype.hasOwnProperty.call(ref, 'attachment'))
+        .map(ref => ref.attachment as string);
       if (attachmentRefs.length > 0) {
-      const randomRef = attachmentRefs[Math.floor(Math.random() * attachmentRefs.length)];
-      messageOpts.files = [{ attachment: randomRef.attachment }];
+        const randomRefAttachment =
+          attachmentRefs[Math.floor(Math.random() * attachmentRefs.length)];
+        messageOpts.files = [randomRefAttachment];
       } else {
         const randomMessage = markovDB[Math.floor(Math.random() * markovDB.length)];
-      if (Object.prototype.hasOwnProperty.call(randomMessage, 'attachment')) {
+        if (randomMessage.attachment) {
           messageOpts.files = [{ attachment: randomMessage.attachment }];
         }
       }
 
-    result.string.replace(/@everyone/g, '@everyοne'); // Replace @everyone with a homoglyph 'o'
+      myResult.string.replace(/@everyone/g, '@everyοne'); // Replace @everyone with a homoglyph 'o'
       message.channel.send(result.string, messageOpts);
-    if (debug) message.channel.send(`\`\`\`\n${JSON.stringify(result, null, 2)}\n\`\`\``);
-  }).catch((err) => {
+      if (debug) message.channel.send(`\`\`\`\n${JSON.stringify(myResult, null, 2)}\n\`\`\``);
+    })
+    .catch(err => {
       console.log(err);
       if (debug) message.channel.send(`\n\`\`\`\nERROR${err}\n\`\`\``);
       if (err.message.includes('Cannot build sentence with current corpus')) {
@@ -249,25 +291,24 @@ function generateResponse(message, debug = false, tts = message.tts, filterWords
     });
 }
 
-
 client.on('ready', () => {
   console.log('Markbot by Charlie Laabs');
   client.user.setActivity(GAME);
   regenMarkov();
 });
 
-client.on('error', (err) => {
+client.on('error', err => {
   const errText = `ERROR: ${err.name} - ${err.message}`;
   console.log(errText);
   errors.push(errText);
-  fs.writeFile('./config/error.json', JSON.stringify(errors), (fsErr) => {
+  fs.writeFile('./config/error.json', JSON.stringify(errors), fsErr => {
     if (fsErr) {
       console.log(`error writing to error file: ${fsErr.message}`);
     }
   });
 });
 
-client.on('message', (message) => {
+client.on('message', message => {
   if (message.guild) {
     const command = validateMessage(message);
     if (command === 'help') {
@@ -275,14 +316,26 @@ client.on('message', (message) => {
         .setAuthor(client.user.username, client.user.avatarURL)
         .setThumbnail(client.user.avatarURL)
         .setDescription('A Markov chain chatbot that speaks based on previous chat input.')
-        .addField('!mark', 'Generates a sentence to say based on the chat database. Send your '
-        + 'message as TTS to recieve it as TTS.')
-        .addField('!mark train', 'Fetches the maximum amount of previous messages in the current '
-        + 'text channel, adds it to the database, and regenerates the corpus. Takes some time.')
-        .addField('!mark regen', 'Manually regenerates the corpus to add recent chat info. Run '
-        + 'this before shutting down to avoid any data loss. This automatically runs at midnight.')
-        .addField('!mark invite', 'Don\'t invite this bot to other servers. The database is shared '
-        + 'between all servers and text channels.')
+        .addField(
+          '!mark',
+          'Generates a sentence to say based on the chat database. Send your ' +
+            'message as TTS to recieve it as TTS.'
+        )
+        .addField(
+          '!mark train',
+          'Fetches the maximum amount of previous messages in the current ' +
+            'text channel, adds it to the database, and regenerates the corpus. Takes some time.'
+        )
+        .addField(
+          '!mark regen',
+          'Manually regenerates the corpus to add recent chat info. Run ' +
+            'this before shutting down to avoid any data loss. This automatically runs at midnight.'
+        )
+        .addField(
+          '!mark invite',
+          "Don't invite this bot to other servers. The database is shared " +
+            'between all servers and text channels.'
+        )
         .addField('!mark debug', 'Runs the !mark command and follows it up with debug info.')
         .setFooter(`Markov Discord v${version} by Charlie Laabs`);
       message.channel.send(richem).catch(() => {
@@ -314,7 +367,7 @@ client.on('message', (message) => {
     if (command === null) {
       console.log('Listening...');
       if (!message.author.bot) {
-        const dbObj = {
+        const dbObj: MessageRecord = {
           string: message.content,
           id: message.id,
         };
@@ -331,17 +384,19 @@ client.on('message', (message) => {
       const richem = new Discord.RichEmbed()
         .setAuthor(`Invite ${client.user.username}`, client.user.avatarURL)
         .setThumbnail(client.user.avatarURL)
-        .addField('Invite', `[Invite ${client.user.username} to your server](https://discordapp.com/oauth2/authorize?client_id=${client.user.id}&scope=bot)`);
+        .addField(
+          'Invite',
+          `[Invite ${client.user.username} to your server](https://discordapp.com/oauth2/authorize?client_id=${client.user.id}&scope=bot)`
+        );
 
-      message.channel.send(richem)
-        .catch(() => {
+      message.channel.send(richem).catch(() => {
         message.author.send(richem);
       });
     }
   }
 });
 
-client.on('messageDelete', (message) => {
+client.on('messageDelete', message => {
   // console.log('Adding message ' + message.id + ' to deletion cache.')
   deletionCache.push(message.id);
   console.log('deletionCache:', deletionCache);

package.json

@@ -23,38 +23,29 @@
   "license": "MIT",
   "dependencies": {
     "bufferutil": "^4.0.1",
-    "discord.js": "^11.4.2",
+    "discord.js": "^11.5.1",
     "erlpack": "github:discordapp/erlpack",
-    "markov-strings": "^1.5.2",
+    "markov-strings": "^2.1.0",
     "node-schedule": "^1.3.2",
-    "zlib-sync": "^0.1.4"
+    "zlib-sync": "^0.1.6"
   },
   "engines": {
     "node": ">=8.0.0"
   },
   "devDependencies": {
-    "eslint": "^5.16.0",
-    "eslint-config-airbnb-base": "^13.1.0",
-    "eslint-plugin-import": "^2.17.2"
+    "@types/node": "^12.12.21",
+    "@types/node-schedule": "^1.3.0",
+    "@typescript-eslint/eslint-plugin": "^2.12.0",
+    "@typescript-eslint/parser": "^2.12.0",
+    "eslint": "^6.8.0",
+    "eslint-config-airbnb-base": "^14.0.0",
+    "eslint-config-prettier": "^6.7.0",
+    "eslint-plugin-import": "^2.19.1",
+    "eslint-plugin-prettier": "^3.1.2",
+    "prettier": "^1.19.1",
+    "typescript": "^3.7.4"
   },
-  "eslintConfig": {
-    "parserOptions": {
-      "ecmaVersion": 2017
-    },
-    "env": {
-      "node": true
-    },
-    "extends": [
-      "airbnb-base"
-    ],
-    "rules": {
-      "no-console": 0,
-      "no-plusplus": [
-        "error",
-        {
-          "allowForLoopAfterthoughts": true
-        }
+  "eslintIgnore": [
+    "**/*.js"
   ]
-    }
-  }
 }

tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ES2019", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "outDir": "./dist", /* Redirect output structure to the directory. */
+    "removeComments": true, /* Do not emit comments to output. */
+    "strict": true, /* Enable all strict type-checking options. */
+    "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    "typeRoots": [
+      "node_modules/@types"
+    ], /* List of folders to include type definitions from. */
+    "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
+    "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
+  },
+  "include": [
+    "**/*.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "dist"
+  ]
+}