code: function validate(cosmiconfig) {
    if (!cosmiconfig) {
      printColumns(
        chalk.red(
          `Oops, no stylelint config found, we support cosmiconfig...${EOL}` +
            chalk.cyan('https://github.com/davidtheclark/cosmiconfig')
        )
      );
  
      return process.exit(1);
    }
  
    if (!argv.unused && !argv.deprecated && !argv.invalid && !argv.current && !argv.available) {
      printColumns(chalk.red(`Oops, one of the command line Options must be set...${EOL}`));
      yargs.showHelp();
  
      return process.exit(1);
    }
  
    return cosmiconfig;
  }
docs: Check we got everything we need:
  - stylelint config (by comiconfig)
  - CLI arguments