How to use the inquirer.initialize function in inquirer

SimpleShell.registerCommand({
      name: 'help',
      help: 'Show this help menu',
      handler: helpHandler
    });

    SimpleShell.registerCommand({
      name: 'exit',
      help: 'Exit the console',
      handler: function() {
        rl.close();
      }
    });
  }

  SimpleShell.initialize = initialize;
  SimpleShell.registerCommand = registerCommand;
  SimpleShell.startConsole = startConsole;
  SimpleShell.log = log;
  SimpleShell.info = info;
  SimpleShell.warn = warn;
  SimpleShell.error = error;
  SimpleShell.success = success;

  module.exports = SimpleShell;

})(module);