Angular 15: Dependency Injection guide with Nested Services in a Lazy Loaded Module
I've spent hours debugging this and I'm having trouble with I've looked through the documentation and I'm still confused about I'm working with an scenario with dependency injection in Angular 15 where a service that is supposed to be provided in a lazy-loaded module is failing to inject correctly into a component. I've defined a service called `UserService` that fetches user data from an API and is provided in the `UserModule`. However, when I navigate to the route that uses this module, I get the following behavior: ``` NullInjectorError: No provider for UserService! ``` I have structured my application with lazy loading, and my `UserModule` is set up like this: ```typescript @NgModule({ declarations: [UserComponent], imports: [CommonModule, RouterModule.forChild(routes)], providers: [UserService] }) export class UserModule {} ``` And in my main `AppRoutingModule`, I have: ```typescript const routes: Routes = [ { path: 'user', loadChildren: () => import('./user/user.module').then(m => m.UserModule) } ]; ``` In `UserComponent`, I'm attempting to inject the service: ```typescript @Component({ selector: 'app-user', templateUrl: './user.component.html' }) export class UserComponent { constructor(private userService: UserService) { this.userService.getUserData().subscribe(data => { console.log(data); }); } } ``` I've double-checked that the `UserService` is indeed exported from its file and that the module is being loaded correctly. I also tried importing the `UserService` directly in the `AppModule`, but that didn’t resolve the scenario. Could there be something wrong with how lazy loading is affecting the injector or the module's provider scope? Any insights or solutions would be greatly appreciated! This is part of a larger CLI tool I'm building. I'm working on a CLI tool that needs to handle this. Thanks in advance! This is part of a larger microservice I'm building.