code: function Parser(options) {
    options = options || {};
  
    // env storage
    this._env = Object.create(null);
  
    // current env
    this._currEnv = options.currEnv || process.env;
  
    // enable/disable booleans
    this._allowBool = has.call(options, 'booleans')
      ? options.booleans
      : false;
  
    // enable/disable numbers
    this._allowNum = has.call(options, 'numbers')
      ? options.numbers
      : false;
  }
docs: .env file parser.
  
  @constructor