index.js

//keeping the bot online
const http = require('http');
const express = require('express');
const app = express();
app.get("/", (request, response) => {
  console.log(Date.now() + " Ping Received");
  response.sendStatus(200);
});
app.listen(process.env.PORT);
setInterval(() => {
  http.get(`http://${process.env.PROJECT_DOMAIN}.glitch.me/`);
}, 280000);

//bot
const Discord = require('discord.js');
const client = new Discord.Client();
const fs = require('fs');
const { prefix, token } = require('./config.json');


client.once('ready', () => {
	console.log('Ready!');
});

/*╔═══════════════════════════════════════╗
    Command handler
  ╚═══════════════════════════════════════╝*/
client.commands = new Discord.Collection();

const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

for (const file of commandFiles) {
	const command = require(`./commands/${file}`);
	client.commands.set(command.name, command);
}

client.on('message', async message => {
	if (!message.content.startsWith(prefix) || message.author.bot) return;

	const args = message.content.slice(prefix.length).split(/ +/);
	const command = args.shift().toLowerCase();

	if (!client.commands.has(command)) return;

	try {
		client.commands.get(command).execute(message, args);
	}
	catch (error) {
		console.error(error);
		message.reply('there was an error trying to execute that command!');
	}
});

/*╔═══════════════════════════════════════╗
    Reaction Role
  ╚═══════════════════════════════════════╝*/
//initial message
const initialMessage = "React with a game emoji to assign yourself the associated role";

//send initialMessage and add reactions
client.on('message', message => {
if (message.content === '!rr'&& message.member.permissions.has('ADMINISTRATOR')) {
    message.channel.send(initialMessage).then(async msg => {
      await msg.react('👍')
      await msg.react('👎');
      await msg.react('531436404203585536')
      await msg.react('527157017807159324')
    });
   }
});

//track event
const events = {
	MESSAGE_REACTION_ADD: 'messageReactionAdd',
	MESSAGE_REACTION_REMOVE: 'messageReactionRemove',
};

client.on('raw', async event => {
	if (!events.hasOwnProperty(event.t)) return;
	
	const user = client.users.get(event.d.user_id);
	const channel = client.channels.get(event.d.channel_id) || await user.createDM();

	if (channel.messages.has(event.d.message_id)) return; 
  
	const message = await channel.fetchMessage(event.d.message_id); 
	const emojiKey = (event.d.emoji.id) ? `${event.d.emoji.name}:${event.d.emoji.id}` : event.d.emoji.name;
	let reaction = message.reactions.get(emojiKey);

	if (!reaction) {
		const emoji = new Discord.Emoji(client.guilds.get(event.d.guild_id), event.d.emoji);
		reaction = new Discord.MessageReaction(message, emoji, 1, event.d.user_id === client.user.id);
	}

	client.emit(events[event.t], reaction, user, message);
});


//add role based on reaction
client.on('messageReactionAdd', (reaction, user) => {
        
        if (!user.bot) {  
          
          let Member = reaction.message.guild.roles.find(Member => Member.name === "Member");    
          console.log(`${user.username} reacted with "${reaction.emoji.name}".`)
           
            switch (reaction.emoji.id || reaction.emoji.name) {

            case '👍':
              reaction.message.guild.member(user).addRole("527071813692293121");
                break;
            case '👎':
              reaction.message.guild.member(user).addRole("527071837050634240");
                break;
            case '531436404203585536':
              reaction.message.guild.member(user).addRole("530004472856969229");
                break;
            case '527157017807159324':
              reaction.message.guild.member(user).addRole("530004514896478209");
                break;
            }
        }
});

client.on('messageReactionRemove', (reaction, user) => {
  
	    if (!user.bot) {
        
        let Member = reaction.message.guild.roles.find(Member => Member.name === "Member");       
          console.log(`${user.username} removed their "${reaction.emoji.name}reaction".`)

          switch (reaction.emoji.id || reaction.emoji.name) {
            case '👍':
              reaction.message.guild.member(user).removeRole("527071813692293121");
                break;
            case '👎':
              reaction.message.guild.member(user).removeRole("527071837050634240");
                break;
            case '531436404203585536':
              reaction.message.guild.member(user).removeRole("530004472856969229");
                break;
            case '527157017807159324':
              reaction.message.guild.member(user).removeRole("530004514896478209");
                break;
             }
      }
});  
client.login(token);