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This tells Angular to provide the service in the application root. import { Injectable } from '@angular/core'; @Injectable({ providedIn: 'root', }) export class UserService { } If you provide a service by setting {providedIn: 'root'} the service should be created according to the docs. When you provide the service at the root level, Angular creates a single, shared instance of HeroService and injects into any class that asks for it. These come with services without the providedIn: "root" decorator. However the services consuming these libraries use the providedIn: "root" method. Only providing the service without the providedIn decorator, doesn't help. The only workaround I could find, is to manually provide the outer service and the ionic-native service.
The problem of working with lazy loaded module is that if we use providedIn: 'root' even though we think we should get a new instance of a service, it gives the same instance and that might not be the behavior … 2020-10-09 2020-02-19 2019-12-15 2018-10-11 The providedIn: string metadata of @Injectable specifies which injector to register with. Using this method, and depending on if the service gets used, the service may or may not register with the injector. Angular calls this tree-shaking. By default the value is set to ‘root’. The @Injectable decorator together with the ‘providedIn’ option means the service should not be added within the providers’ array of a module. The correct answers are 2 and 4. To find out why, keep reading this guide, where we will discuss the @Injectable decorator and its effect on DI in Angular.
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This dataset provides demographic information from the American Community Survey about residents of Virginia Beach. This data was originally provided in the
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Determines which injectors will provide the injectable, by either associating it with an @NgModule or other InjectorType, or by specifying that this injectable should be provided in one of the following injectors: 'root' : The application-level injector in most apps.
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providedIn: ‘root’ tells Angular to register the service as a singleton in the application … providedIn tells Angular that the root injector is responsible for creating an instance of the your Service. Services that are provided this way are automatically made available to the entire application and don't need to be listed in any module. What is providedIn? The Injectable decorator takes a property called provideIn that have by default the root value. The providedIn property tells the Angular dependency injection with the "scope" of our service in the application i.e where it can be provided.
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