code: function (env) {
  
      console.log('Stubbatti server version %s.', Stubbatti.version);
  
      // If `-h` or `--help` option is specified then it shows the help messages and exits.
      if (argv.help || argv.h) {
          showHelp();
  
          return;
      }
  
      if (!env.configPath) {
          console.log('Error: `stubbatti` file not found.');
          console.log('see %s', homepage);
  
          return;
      }
  
      console.log('Loading %s.', env.configPath);
  
      // load user defined stubbatti file
      require(env.configPath);
  
      // If `--kill` option is specified then it doesn't launch a stub server but kills the existing sevrer.
      if (argv.kill) {
          stubbatti.killExistingServer();
  
          return;
      }
  
      // launch a stub server
      stubbatti.start();
  }
docs: main