irc bot written in javascript for nodejs

config.json

{
    "nickname": "xnodeuser",
    "username": "xnodeuser",
    "hostname": "myhost",
    "servername": "myserver",
    "realname": "xnodeuser",
    "channel": "#xnodeuser"
}

main.js

const net = require('net');
const config = require('./config.json');
const protocol = require('./protocol.js');


const [host, port] = process.argv.slice(2);
const user = [
    config.username,
    config.hostname,
    config.servername,
    config.realname
].join(' ');

const client = net.createConnection({host, port}, () => {
    client.write(`USER ${user}\r\n`);
    client.write(`NICK ${config.nickname}\r\n`);
    client.write(`JOIN ${config.channel}\r\n`);
});

const send = text => client.write(`${text}\r\n`);

const handle = function handle (message) {
    protocol
        .filter((handler) => message.match(handler.pattern))
        .forEach((handler) => {
            console.log(`==> Found: ${handler.pattern}`);
            const groups = message.match(handler.pattern);
            for (let text of handler.action(...groups)) {
                send(text);
            }
        });
};

client.on('data', (data) => {
    const message = data.toString();
    console.log(message);
    handle(message);
});

protocol.js

function* ping (raw, target) {
    yield `PONG ${target}`;
}

function* greet (raw, user, target) {
    yield `PRIVMSG ${target} :hello ${user}!`;
    yield `PRIVMSG ${target} :I've missed you!`;
}

module.exports = [
    { pattern: /^PING :(.+)/, action: ping},
    { pattern: /^:(.+)!.+@.+ PRIVMSG (.+) :hello/, action: greet},
];