A command bot example

index.js

const tmi = require('tmi.js'),
	request = require('request'),
	countdown = require('countdown'),
	
	kraken = request.defaults({
			baseUrl: 'https://api.twitch.tv/kraken/',
			json: true,
			headers: {
				'Client-ID': '',
				Accept: 'application/vnd.twitchtv.v3+json'
			}
		});

let client = new tmi.client({
		options: {
			debug: true
		},
		connection: {
			reconnect: true,
			secure: true
		},
		channels: [
			'alca'
		],
    identity: {
      username: '',
      password: ''
    }
	});

client.on('message', (channel, userstate, message, fromSelf) => {
	if(fromSelf || message[0] !== '!') {
		return;
	}
	
	userstate.name = userstate['display-name'] || userstate.username;
	
	let chan = channel.slice(1),
		params = message.split(' '),
		commandName = params.shift().slice(1).toLowerCase(),
		hasParams = params.length > 0,
		perms = {
			mod: userstate.mod,
			broadcaster: userstate['user-id'] === userstate['room-id']
			//broadcaster: 'broadcaster' in userstate.badges
		},
		reply = msg => client.say(channel, msg);
	
	perms.modUp = perms.mod || perms.broadcaster;
	
	if(commandName === 'time') {
		let d = new Date();
		reply(d.toLocaleString());
	}
	else if(commandName === 'created') {
		let target = userstate.username;
		if(hasParams && perms.modUp) {
			target = params[0];
		}
		
		kraken({
			url: `users/${target}`,
			qs: {
				_: Math.random() * 1000000
			}
		}, (err, res, body) => {
			if(err) {
				console.log('ERROR', err);
				reply('Errror');
				return;
			}
			else if(res.statusCode !== 200) {
				reply('User not found');
				return;
			}
			
			let timestamp = new Date(body.created_at).getTime(),
				created = countdown(timestamp, Date.now(), 158),
				name = body.display_name || body.name,
				message = `${userstate.name}, ${name} was created ` +
					`${created.toString()} ago.`;
			
			reply(message);
		});
	}
	else if(commandName === 'uptime') {
		let target = chan;
		if(hasParams && perms.modUp) {
			target = params[0];
		}
		
		kraken({
			url: `streams/${target}`,
			qs: {
				_: Math.random() * 1000000
			}
		}, (err, res, body) => {
			if(err) {
				console.log('ERROR', err);
				reply('Errror');
				return;
			}
			else if(res.statusCode !== 200) {
				reply('User not found');
				return;
			}
			
			if(body.stream === null) {
				reply(`${target} is offline. :(`);
				return;
			}
			
			let timestamp = new Date(body.stream.created_at).getTime(),
				uptime = countdown(timestamp, Date.now(), 158),
				name = body.stream.channel.display_name,
				message = `${name} has been live for ${uptime}!`;
			
			reply(message);
		});
	}
});

client.connect();

I know this is old. But I can't seem to find the correct "countdown" to install? Keeps saying cannot find module.
Using Windows 8.1