process.env setter #Javascript

env.js

const fs = require('fs')

const rootDir = require('../utils/rootDir')

const env = {
  // accepts a filename and if no filename, it defaults to .env
  config: filename => {
    filename === undefined ? (filename = '.env') : filename

    fs.readFileSync(`${rootDir}/${filename}`, 'utf-8')
      .split('\n')
      .filter(each => {
        return each.includes('=') && (!each.includes('# ') || !each === '')
      })
      .forEach(each => {
        let envKeyValue = each.split('=')
        process.env[envKeyValue[0]] = envKeyValue[1]
        return
      })
  },
}

module.exports = env

rootDir.js

const path = require('path')

// the second argument to be root directory actual path. This is a helper file
module.exports = path.resolve(__dirname, '../../')