app.js

function showMenu (menu) {

    const args = process.argv


    const items = menu
    .map((item, i) => `${i}. ${item}`)
    .join('\n')


    console.log(`
    ===============================
            what you choice ? 
    ===============================
     
            ${items}
    
    ===============================
            you choice ${menu[args[2] - 1]}
    ===============================
    `)

}

module.exports = {
    showMenu: showMenu
}

index.js

const app = require('./app.js')
const fs = require('fs')

const menu = fs.readFile('./items.txt', 'utf8', (error, item) => {
    console.log(item)
}) 

// app.showMenu(menu)