code: function uninstalledVer(name, ver, dir) {
          var _child$spawnSync4 = _child_process2['default'].spawnSync(npmCommand, ['uninstall', ver.length === 0 ? name : name + '@' + ver], { cwd: dir });
  
          var error = _child$spawnSync4.error;
  
          if (error) throw error;
      }
docs: uninstall package via npm
  
  @param {String} [name] published package name
  @param {String} [ver] install version
  @param {String} [dir] uninstall directory
  @public