Discord to IRC and back.

config.json

{
  "token": "",
  "irc": {
    "channel": "",
    "username": "",
    "pass": ""
  },
  "discord": {
    "guild": "",
    "channel": ""
  }

ircbridge.js

const Carp = require("carp-irc")
const Discord = require('discord.js')
const Config = require('./config.json')
const Client = new Carp.Client({
    username: Config.irc.username, 
    pass: Config.irc.pass
})
const Bot = new Discord.Client()

Client.on("ready", () => {
    console.log("IRC Client online.")

    Client.join("#discorddungeons")
})
Bot.on('ready', () => {
    console.log("Discord Client online.")
})

Client.on("join", joinData => {
    let channel = joinData.channel
    let guild = Bot.guilds.get('346385992674050058').channels.get('347057875702775811')
    channel.on("message", (from, message) => {
        if(from.info.nickname === Client.info.username) {return}
        guild.send(`**<${from.info.nick}>** ${message}`)
        console.log(`[IRC] ${channel.name} | ${from.info.nick}: ${message}`)
    })
    channel.on('join', (user) => {
        guild.send(`**${user.info.nick}** joined #discorddungeons`)
        console.log(`[IRC] ${user.info.nick} joined ${channel.name}`)
    })
    channel.on('part', (user, message) => {
        guild.send(`**${user.info.nick}** left ${channel.name}`)
        console.log(`[IRC] ${user.info.nick} left ${channel.name}`)
    })
    channel.on('+mode', (user, from, modes) => {
        guild.send(`**${from} gives **${user}** the flag(s) ${modes.join(', ')}`)
        console.log(`${from} gives ${user} the flag(s) ${modes.join(', ')}`)
    })
    channel.on('-mode', (user, from ,modes) => {
        guild.send(`**${from}** removes **${user}** the flag(s) ${modes.join(', ')}`)
        console.log(`${from} removes ${user} the flag(s) ${modes.join(', ')}`)
    })
    Bot.on('message', msg => {
        if(msg.author.bot) {return}
        if(msg.channel.id !== '347057875702775811') {return}
        channel.sendMessage(`${msg.author.tag}: ${msg.content}`)
        console.log(`[Discord] ${msg.guild.name} | ${msg.channel.name} | ${msg.author.tag}: ${msg.content}`)
    })
})

Client.connect("irc.freenode.net")
Bot.login(Config.token)