node-job.js

const fs   = require('fs')
const jimp = require('jimp')
const log  = require('./log')

module.exports = function runJob() {

  return new Promise(async (resolve, reject) => {

    const randomNumber = () => Math.floor(Math.random() * 1995) * 15
    const destFileName = `${__dirname}/../imgs/dest/${randomNumber()}-img.jpg`

    log(`Copying ${destFileName}`)
    fs.copyFileSync(`${__dirname}/../imgs/landscape.jpg`, destFileName)

    log(`Flipping ${destFileName}`)
    const image = await jimp.read(destFileName)
    image.flip(true, false)

    log(`Deleting ${destFileName}`)
    fs.unlink(destFileName, (err) => {
      return err ? reject(err) : resolve('success')
    })
    
  })

}