Disposal of injections into another service (singleton), Angular2

Question

I have two services, both @Injectable. ServiceA is provided to components through the Providers array and is ubiquitous. ServiceB is a singleton and is located in the Providers array of its module and works great everywhere. ServiceA should not remain anything, and ServiceB should remain single.

My problem is that now I need to access ServiceA from ServiceB, but I don’t know how to access it. It seems that I cannot enter non-single service into a singleton.

Everything that I encounter tells me that I have to put the service in bootstrap or in the module declaration, but, as I said, I can’t do this, because I need ServiceA to behave as not a single one.

// module setup
... providers: [ServiceB]

// non-singleton
@Injectable()
export class ServiceA

// singleton
@Injectable()
export class ServiceB {
  constructor(ServiceA)  // <-- this is the problem area, need to get ServiceA here

- (Inject (ServiceA) serviceA), ,

: DI ServiceA!

• "" , singleton, , @Injectable?

Answer 1

ServiceA @Component.providers, @NgModule.providers:

• ServiceA ( @Component.providers).
• ServiceA ( : ServiceA ServiceB) ( @NgModule.providers).

, (@Component.providers), "" , @NgModule.providers.

:

• ServiceA ServiceB AND ServiceC, B C A.
• Seaal , .