module.exports vs exports in Node.js

Question

I\'ve found the following contract in a Node.js module:

module.exports = exports = nano = function database_module(cfg) {...}

I wonder what

Answer 1

var a = {},md={};

//Firstly,the exports and module.exports point the same empty Object

exp = a;//exports =a;
md.exp = a;//module.exports = a;

exp.attr = "change";

console.log(md.exp);//{attr:"change"}

//If you point exp to other object instead of point it's property to other object. The md.exp will be empty Object {}

var a ={},md={};
exp =a;
md.exp =a;

exp = function(){ console.log('Do nothing...'); };

console.log(md.exp); //{}