Nodejs: module.exports vs exports

greet1.js

// module.exports

module.exports = function greet () {
    console.log('greet1 [module.exports]')
}

console.log(exports)
console.log(module.exports)

greet2.js

// exports

exports.greet = function greet () {
    console.log('greet2 [exports]')
}

console.log(exports)
console.log(module.exports)

index.js

// module.exports (ME) vs exports (E)
var greetME = require('./greet1')
var greetE = require('./greet2')

// you can modify the `requre`'s return value
greet1()
// you ALWAYS get back an object, you can ONLY mutate it
greet2.greet()