Iterate through files in dir

srpt.js

const fs = require('fs')

var walk = function (dir, done) {
  fs.readdir(dir, (error, list) => {
    if (error) {
      return done(error)
    }

    let i = 0;

    (function next () {
      let file = list[i++]

      if (!file) {
        return done(null)
      }

      file = `${dir}/${file}`

      fs.stat(file, (error, stat) => {
        if (stat && stat.isDirectory()) {
          walk(file, error => {
            next()
          })
        } else {

          if (typeof file !== 'undefined') {
            console.log(file)
          }
          next()
        }
      })
    }())
  })
}