app.js

// Load up the discord.js library
const Discord = require("discord.js");

const self = ["my", "i"];
const negatives = ["don't", "can't", "doesn't", "aren't"];
const matches = ["matches", "games", "stats"];

// This is your client. Some people call it `bot`, some people call it `self`, 
// some might call it `cootchie`. Either way, when you see `client.something`, or `bot.something`,
// this is what we're refering to. Your client.
const client = new Discord.Client();

// Here we load the config.json file that contains our token and our prefix values. 
const config = require("./config.json");
// config.token contains the bot's token
// config.prefix contains the message prefix.

client.on("ready", () => {
  // This event will run if the bot starts, and logs in, successfully.
  console.log(`Bot has started, with ${client.users.size} users, in ${client.channels.size} channels of ${client.guilds.size} guilds.`); 
  // Example of changing the bot's playing game to something useful. `client.user` is what the
  // docs refer to as the "ClientUser".
  client.user.setGame(`on ${client.guilds.size} servers`);
});

client.on("guildCreate", guild => {
  // This event triggers when the bot joins a guild.
  console.log(`New guild joined: ${guild.name} (id: ${guild.id}). This guild has ${guild.memberCount} members!`);
  client.user.setGame(`on ${client.guilds.size} servers`);
});

client.on("guildDelete", guild => {
  // this event triggers when the bot is removed from a guild.
  console.log(`I have been removed from: ${guild.name} (id: ${guild.id})`);
  client.user.setGame(`on ${client.guilds.size} servers`);
});

client.on("message", async message => {
  // This event will run on every single message received, from any channel or DM.
  
  // It's good practice to ignore other bots. This also makes your bot ignore itself
  // and not get into a spam loop (we call that "botception").
  if(message.author.bot) return;
  if(self.some(s => message.content.includes(s)) && negatives.some(negative => message.content.includes(negative)) && matches.some(match => message.content.includes(match))) {
    console.log(message.content, 'replying');
    message.reply('have you enabled Expose Public Match Data in the Dota 2 client?');
  } else {
    console.log(message.content, 'not replying');
  }
});

client.login(config.token);