docs: function invokeCommandError(command, isInternalCommand) {
  
    if (isInternalCommand) {
      return;
    }
  
    const cwd = process.cwd();
    logger.error(`No modules found for ${command}`);
  
    if (cwd.indexOf('skyux-spa') === -1) {
      logger.error(`Are you in a SKY UX SPA directory?`);
    } else if (!fs.existsSync('./node_modules')) {
      logger.error(`Have you ran 'npm install'?`);
    }
  
    process.exit(1);
  }