Node.js Unicode IRC Bot. Requires the node irc library.

unibot.js

// Unibot - IRC Bot that enforces non Unicode communication in #NoBasicLatin on Esper.NET
// Copyright (c) 2016 Dorian Stoll
// Licensed as MIT

// Messages for kicking
var messages = [
    'This channel is Unicode only.',
    'No basic Latin here!',
    'Learn your Unicode.',
    'Down with American Mainstream!'
];

var irc = require('irc')
var client = new irc.Client('irc.esper.net',
    'Unibot',
    {
        debug: true,
        autoRejoin: true,
        channels: ['#NoBasicLatin']
    });

// Register handlers
var authed = false;
client.addListener('names',
    function (from, message) {
        if (!authed) {
            client.say('NickServ', "identify ##PASSWORD##");
            authed = true;
        }
    });

function checkASCII(from, to, message) {
    console.log(from + ' => ' + message);
    if (isASCII(message)) {
        client.send('KICK', '#NoBasicLatin', from, messages[Math.floor(Math.random() * messages.length)]);
        console.warn(from + ' got kicked for using ASCII!');
    }
}

client.addListener('message', checkASCII);
client.addListener('action', checkASCII);

function isASCII(str) {
    if (typeof (str) !== 'string') {
        return false;
    }
    for (var i = 0; i < str.length; i++) {
        if (str.charCodeAt(i) > 127) {
            return false;
        }
    }
    return true;
}