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// app.module.ts
...
import { elephantMockRepositoryFactory } from './data/repository/elephant-mock-repository/elephant-mock.repository';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    DataModule,
    CoreModule.forRoot(elephantMockRepositoryFactory),
    PresentationModule
  ], 
  bootstrap: [AppComponent]
})
export class AppModule { }


// core.module.ts

CoreModule {
   static forRoot(factory: () => ElephantRepository ) {
      return {
         ngModule: CoreModule ,
         providers: {
            provide: ElephantRepository, useFactory: factory
         }
      }
   }
}

// app.module.ts
...
import { elephantMockRepositoryFactory } from './data/repository/elephant-mock-repository/elephant-mock.repository';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    DataModule,
    CoreModule,
    PresentationModule,
    MockModule
  ], 
  bootstrap: [AppComponent]
})
export class AppModule { }


// mock.module.ts

@NgModule({
...
 providers: [
    {provide: ElephantRepository, useClass: ElephantMockRepository}
 ]
...
})
MockModule {  ... }

// environment.ts
export const environment = {
 ...
 modules: [
    MockModule
 ] 
 ...
}

// environment.prod.ts
export const environment = {
 ...
 modules: [
    ConcreteImplementationModule
 ] 
 ...
}

// app.module.ts

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    DataModule,
    CoreModule,
    PresentationModule,
    ...environment.modules
  ], 
  bootstrap: [AppComponent]
})
export class AppModule { }