angular5-course/src/app/core/core.module.ts

import { NgModule } from "@angular/core";
import { HTTP_INTERCEPTORS } from "@angular/common/http";

import { HeaderComponent } from "./header/header.component";
import { HomeComponent } from "./home/home.component";
import { SharedModule } from "../shared/shared.module";
import { AppRoutingModule } from "../app-routing.module";
import { RecipeService } from "../recipes/recipe.service";
import { DataStorageService } from "../shared/data-storage.service";
import { AuthInterceptor } from "../shared/auth.interceptor";
import { LoggingInterceptor } from "../shared/logging.interceptor";

@NgModule({
    declarations: [
        HeaderComponent,
        HomeComponent
    ],
    imports: [
        SharedModule,
        AppRoutingModule
    ],
    exports: [
        AppRoutingModule,
        HeaderComponent
    ],
    providers: [
      RecipeService, 
      DataStorageService, 
      {provide: HTTP_INTERCEPTORS, useClass: AuthInterceptor, multi: true},
      {provide: HTTP_INTERCEPTORS, useClass: LoggingInterceptor, multi: true}
    ],
})
export class CoreModule {}