Utilizing Lazy Loading for the search HomeComponent, which is not being utilized within the module

I'm facing an issue with Lazy Loading in Angular. I have a module called ShopCartModule that needs to be implemented using Lazy Loading.

In addition to the ShopCartModule, I also have the AppModule and the CoreModule.

This is my AppModule:

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    CoreModule,
    ShopCartModule,
    HttpClientModule,
    FormsModule,
    SharedModule,
    AboutModule,
    ContactModule,
    NgbModule.forRoot()
  ],
  providers: [
    NgbActiveModal
  ],
  bootstrap: [AppComponent],
})

export class AppModule {
}

And this is my CoreModule:

@NgModule({


    imports: [
        CommonModule,
        AppRoutingModule,
        CarouselModule.forRoot(),
        SharedModule,
        SlickCarouselModule,
        BrowserModule,
        AppRoutingModule,
        HttpClientModule,
        FormsModule,
        BrowserModule
    ],
    exports: [
        AppRoutingModule,
        HeaderComponent,
        FooterComponent

    ],
    declarations: [
        HeaderComponent,
        HomeComponent,
        FooterComponent,
        LogoutComponent
    ],
    providers: [
        DataStorageService,
        ProductsService,
        ShopCartService,
        AdminSerivice,
        MessageService,
        CategoryService,
        ProductService,
        EmailService,
        AuthenticationService,
        BasicAuthHtppInterceptorService,
        ProductModelOrder,
        {provide: HTTP_INTERCEPTORS, useClass: BasicAuthHtppInterceptorService, multi: true}
    ]
})
export class CoreModule {
}

I've set up the main router module named app-routing.module:

const appRoutes: Routes = [
  { path: '', redirectTo: 'home', pathMatch: 'full'},
  { path: 'home', component: HomeComponent },
  { path: 'o-nama', component: AboutComponent},
  { path: 'kontakt', component: ContactComponent},
  { path: 'shopCart', loadChildren:'./shop-cart/shop-cart.module#ShopCartModule' },
  { path: 'administration', loadChildren: './admin/admin.module#AdminModule', canActivate: [AuthGaurdService] },
  { path: 'productsList', loadChildren: './products/products.module#ProductsModule' },
  { path: 'not-found', component: PageNotFoundComponent },
  { path: '**', redirectTo: '/not-found' }
];

@NgModule({
  imports: [
    RouterModule.forRoot(appRoutes, { preloadingStrategy: PreloadAllModules }),
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Lastly, here's my router module for shop-cart:

const shopCartRoutes: Routes = [
    {
        path: '', component: ShopCartComponent
    },

]
@NgModule({
    imports: [
        RouterModule.forChild(shopCartRoutes)
    ],
    exports: [
        RouterModule
    ]
})
export class ShopCartRoutingModule{}

I encountered the following error message:

ERROR Error: Uncaught (in promise): Error: Component HomeComponent is not part of any NgModule or the module has not been imported into your module.

Despite not using HomeComponent in the module, I am unsure of what the problem might be. Everything works fine when lazy loading is not implemented.

Answer №1

It seems like the issue may be related to the loading order of files. You can try adjusting the code as shown below:

....
imports: [
    BrowserModule,
    CoreModule,    // I've swapped the order here to ensure HomeComponent is available before the routing file.
    AppRoutingModule,
    ShopCartModule,
    HttpClientModule,
    FormsModule,
    SharedModule,
    AboutModule,
    ContactModule,
    NgbModule.forRoot()
  ],
.....

Update -

imports: [
  ....
  // Make sure to add your library as an import
  SlickCarouselModule   // Add SlickCarousel Module here before using it
  ....
]

Answer №2

Upon careful review, the first issue noticed is the order of imports in the modules. The Angular modules should be prioritized (CommonModule, BrowserModule, FormsModule). Additionally, if "moduleA" depends on "moduleB", ensure that the order of import is [moduleB, moduleA].

Secondly, avoid importing the AppRoutingModule Module multiple times; it should be imported only once (either in the AppModule or CoreModule).

Lastly, make sure to import HttpClientModule only once to prevent reinitializing the interceptors. This import should ideally be placed in either the AppModule or CoreModule.

**AppModule**

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    FormsModule,
    SharedModule,
    CoreModule,
    ShopCartModule,
    AboutModule,
    ContactModule,
    NgbModule.forRoot(),
    AppRoutingModule
  ],
  providers: [
    NgbActiveModal
  ],
  bootstrap: [AppComponent],
})

export class AppModule {
}

CoreModule :

@NgModule({

imports: [
    BrowserModule,
    CommonModule,
    FormsModule,
    CarouselModule.forRoot(),
    SharedModule,
    SlickCarouselModule
],
exports: [
    AppRoutingModule,
    HeaderComponent,
    FooterComponent

],
declarations: [
    HeaderComponent,
    HomeComponent,
    FooterComponent,
    LogoutComponent
],
providers: [
    DataStorageService,
    ProductsService,
    ShopCartService,
    AdminSerivice,
    MessageService,
    CategoryService,
    ProductService,
    EmailService,
    AuthenticationService,
    BasicAuthHtppInterceptorService,
    ProductModelOrder,
    {provide: HTTP_INTERCEPTORS, useClass: BasicAuthHtppInterceptorService, multi: true}
]
})
export class CoreModule {
}

Give it a try now.

Answer №3

If you intend to utilize the HomeComponent beyond the confines of the CoreModule, remember to include it in the exports.

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