The deps setting in inversion of control in Angular 7.

Imagine the first bit of code I have here for IoC at an Angular module:

providers: [
   Configuration,
   {provide: IpContract, useClass: IpService}
]

 
 

What if IpService itself needs some stuff handed into it to make it work? Well, we could have a variant of what is above like this:

providers: [
   Configuration,
   {provide: IpContract, useFactory: IpService, deps: [Yin, Yang]}
]

 
 

Here is a trick to moreover refer to references in this ilk which are declared but not yet defined. The details may be filled in later.

providers: [
   Configuration,
   {provide: IpContract, useFactory: IpService, deps: forwardRef(() => IpMagic)}
]