require.cache

magic.js

const path = require('path')

const libPath = path.join(require.resolve('./my-library/another'), '..')
// console.log('libPath :: ', libPath)

const anotherPath = path.join(libPath, 'another')
const another = require(anotherPath)

// console.log('anotherPath ::', anotherPath)
// console.log('another ::', another)

// console.log(require.cache)
// console.log(require.cache[require.resolve(anotherPath)])

require.cache[require.resolve(anotherPath)].exports = {
  ...another,
  message: 'I am superman'
}

// execute my-libary
require(libPath)

my-library\another.js

module.exports = {
  message: 'I am another.js',
  say: function () {
    return 'Hi! how are you :)'
  },
  end: function () {
    return '-----------------'
  }
}

my-library\index.js

const another = require('./another')

console.clear()
console.log(another.message)
console.log(another.say())
console.log(another.end())

console.log('i am called from my-libary/index.js')
console.log('I am my-libary')