code: function installSyncSaveDev(packages) {
      const packageList = Array.isArray(packages) ? packages : [packages];
      const npmProcess = spawn.sync("npm", ["i", "--save-dev"].concat(packageList),
          { stdio: "inherit" });
      const error = npmProcess.error;
  
      if (error && error.code === "ENOENT") {
          const pluralS = packageList.length > 1 ? "s" : "";
  
          log.error(`Could not execute npm. Please install the following package${pluralS} with a package manager of your choice: ${packageList.join(", ")}`);
      }
  }
docs: ------------------------------------------------------------------------------ Private ------------------------------------------------------------------------------ 
  Install node modules synchronously and save to devDependencies in package.json
  @param   {string|string[]} packages Node module or modules to install
  @returns {void}