我执行了以下操作来安装react-webcam，
sudo npm install -g --save react-webcam
npm WARN react-webcam@3.0.1 requires a peer of react@>=15.3.0 but none is installed. You must install peer dependencies yourself.
npm WARN react-webcam@3.0.1 requires a peer of react-dom@>=15.3.0 but none is installed. You must install peer dependencies yourself.
+ react-webcam@3.0.1
added 1 package from 1 contributor in 0.351s
但是它没有添加到package.json中的依赖项中，那么如何将其添加到节点模块中呢？