env-eg

#!/usr/bin/env node
'use strict'

const fs=require('fs')

if(process.argv.length > 3) throw new Error('Too many arguments. Please enter one file name only.')

const file = process.argv[2] || '.env'

fs.readFile(file, (err, data) => {
  if (err) console.error(err.message)
  const dataToArray = data.toString().trim().split('\n')
  const cleanedEnvVars = dataToArray.map(prop => {
    if (prop.trim()[0] === '#') return prop //preserve comment
    return prop.substring(0, prop.indexOf('=')+1)
  }).join('\n')
  const fileData = Buffer.from(cleanedEnvVars)
  fs.writeFile(`${file}.example`, fileData, (err) => {
    if(err) throw err;
    console.log(`${file}.example successfully created.`)
  })
})