Node : Module creation without arguments

exported.js

var EventEmitter = require('events').EventEmitter;

module.exports = new EventEmitter();

setTimeout(function() {
	module.exports.emit('ready');
}, 1000);


exports.toto = function() {
	console.log('Toto called');
}

function longfunction() {
	console.log('Long function called');
}

//module.exports.tata = longfunction;
// SAME as 
exports.tata = longfunction;

//module.exports = {
//	add : function(a, b) {return a + b},
//	sub : function(a, b) {return a - b}
//}

---- index.js :

var exp = require('./exported.js');

console.log(exp);
exp.on('ready', function() {
  console.log('module a is ready');
});
// //console.log(exp.add(2, 4));
// //console.log(exp.sub(10, 2));