執行npm install 出現 npm ERR! Please try running this command again as root/Administrator處理方式

此指令執行
npm install -g webpack webpack-dev-server typescript –verbose
會出現 npm ERR! Please try running this command again as root/Administrator
網路上的解法是用sudo，
但為windows環境，
找到的解法是加上–no-optional參數就可正確執行了
npm install -g webpack webpack-dev-server typescript –verbose –no-optional