const fs = require('fs')
const path = './'
fs.readdir(path, (err, files) => {
  if(err){
    console.log('ocorreu um erro.')
  }else{
    console.log(files)
  }
})

function readdirPromise(files){
    return new Promise((resolve, reject)=>{
        fs.readFile(files, (err, content)=>{
             if(err){
                    reject(err)
                }
                else{
                    resolve(content)
                }
        })

    })
}

readdirPromise(path).then((files)=> console.log(files));