// sandwich.js
function getCheese(msg) {
  return new Promise(function(resolve, reject) {
    setTimeout(function(){ resolve(`cheese from ${msg}`) }, 1000);
  })
}

exports.makeSandwich = async function() {
  return new Promise(function(resolve, reject) {
    let response = await getCheese("Walmart")
    resolve(`sandwich from ${response}`)
  })
}

t = require('./sandwich.js')

async function eat() {
  let sandwich = await t.makeSandwich()
  console.log("ate", sandwich)
}

eat()

let response = await getCheese("Walmart")
                     ^^^^^^^^^