In this blog post I want to describe how to use the useClass, useValue, useFactory, useExisting providers in the new treeshakable providers from Angular.
After this blog post you should have an example how to use those four providers and have an idea what to do with it in case they are a solution to some problems you might face when developing Angular applications.
Introduction Everybody is talking about the providedIn property of the configuration object which can be passed to the Injectable() decorator of the Angular services.