This article explains what npm Peer Dependencies are and when you should use them.
https://medium.com/angular-in-depth/npm-peer-dependencies-f843f3ac4e7f
* AngularInDepth
* This article
* inDepth.dev
* npm
* npm Registry
* dependencies
* peerDependencies
* lodash
* request
* moment
* Angular
* React
* Moment.js