code: function decrypt(passwd) {
    let decipher = crypto.createDecipher(algor, passwd),
      encryptedFileLocation = findFileLocation(ENCRYPTED_FILENAME),
      encryptedFileFullPath = encryptedFileLocation + ENCRYPTED_FILENAME,
      decryptedFileFullPath = encryptedFileLocation + DECRYPTED_FILENAME, // we write decrypted file at same location as where we found encrypted file
      decBuff;
    if (!passwd) {
      throw new Error('decryption requires a password');
    }
    decBuff = Buffer.concat([decipher.update(readFile(encryptedFileFullPath)), decipher.final()]);
    writeFile(decryptedFileFullPath, decBuff);
    return md5FileSync(decryptedFileFullPath);
  }
docs: Write to disk decrypted file (.env) from encrypted file (.env.enc)
  Does not load the variables into process.env
  @param     {String}    passwd      the key used to encrypt the .env into .env.enc we'll use now for decrpypting
  @returns   {String}                writes the decrypted file to disk at same location where the decrypted file was found and returns its md5 checksum