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'use strict'

const fs = require('fs')
const path = require('path')

/*
 * Parses a string or buffer into an object
 * @param {(string|Buffer)} src - source to be parsed
 * @returns {Object} keys and values from src
*/
function parse (src) {
  const obj = {}

// convert Buffers before splitting into lines and processing
  src.toString().split('\n').forEach(function (line) {
    // matching "KEY' and 'VAL' in 'KEY=VAL'
    const keyValueArr = line.match(/^\s*([\w\.\-]+)\s*=\s*(.*)?\s*$/)
    // matched?
    if (keyValueArr != null) {
      const key = keyValueArr[1]

// default undefined or missing values to empty string
      let value = keyValueArr[2] || ''

// expand newlines in quoted values
      const len = value ? value.length : 0
      if (len > 0 && value.charAt(0) === '"' && value.charAt(len - 1) === '"') {
        value = value.replace(/\\n/gm, '\n')
      }

// remove any surrounding quotes and extra spaces
      value = value.replace(/(^['"]|['"]$)/g, '').trim()

obj[key] = value
    }
  })

return obj
}

/*
 * Main entry point into dotenv. Allows configuration before loading .env
 * @param {Object} options - options for parsing .env file
 * @param {string} [options.path=.env] - path to .env file
 * @param {string} [options.encoding=utf8] - encoding of .env file
 * @returns {Object} parsed object or error
*/
function config (options) {
  let dotenvPath = path.resolve(process.cwd(), '.env')
  let encoding = 'utf8'

if (options) {
    if (options.path) {
      dotenvPath = options.path
    }
    if (options.encoding) {
      encoding = options.encoding
    }
  }

try {
    // specifying an encoding returns a string instead of a buffer
    const parsed = parse(fs.readFileSync(dotenvPath, { encoding }))

Object.keys(parsed).forEach(function (key) {
      if (!process.env.hasOwnProperty(key)) {
        process.env[key] = parsed[key]
      }
    })

return { parsed }
  } catch (e) {
    return { error: e }
  }
}

module.exports.config = config
module.exports.load = config
module.exports.parse = parse

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✏️ main.js