Focus.js

const mineflayer = require('mineflayer');

if (process.argv.length < 2 || process.argv.length > 2) {
  console.log('Usage : node Focus.js [<name>]');
  process.exit(1);
}

const bot = mineflayer.createBot({
  host: 'play.totalfreedom.me',
  username: process.argv[2] ? process.argv[4] : 'echo',
  verbose: true
});

bot.on('chat', (username, message) => {
  if (username === bot.username) return;
  bot.chat(message);
});

teach me how to use it ;-;