gistfile1.js

let appId = login = password = phone = ''

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
})

let asker = (variable, name) => () => rl.question(`Введите ${name}: `, answer => {
  variable = answer
  rl.close() // ЧТО Я ДОЛЖЕН ЗДЕСЬ НАПИСАТЬ?
})

const askAppId = asker(appId, "app id")
const askLogin = asker(login, "логин")

askLogin()
askAppId()