16 Nov 2020 In the service above, by specifying providedIn:'root' . We are telling Angular to provide the service at the root level. Here are some important

By default, this decorator has a providedIn property, which creates a provider for the service. In this case, providedIn: 'root' specifies that Angular should provide the service in the root injector. 提供者的作用域link Provider scopelink. 当你把服务提供者添加到应用的根注入器中时，它就在整个应用程序中可用了。

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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. In Code. ionic It also creates a root level injector, which has the app level scope.

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Angular 9 services can be provided in the root or in any of the available modules using any or a specific module. The root value is an alias for the AppModule, any is added starting with Angular 9. The providedIn attribute makes it possible to register a service directly inside the @Injectable() decorator. It is no longer necessary to register a service in @NgModule().

ProvidedIn: root Every service defined with 'root' will be provided in the root injector and is a singleton for the whole application. Lazy modules will use the instance from root. providedIn: 'root' will still be the default choice for most services. ProvidedIn: platform

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With Angular 6, below is the preferred way to create singleton services: From Angular doc: 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. By default, this decorator has a providedIn property, which creates a provider for the service.

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The providedIn attribute makes it possible to register a service directly inside the @Injectable() decorator. It is no longer necessary to register a service in @NgModule(). providedIn: ‘root’ tells Angular to register the service as a singleton in the application root (equivalent to @NgModule({ providers: [ MessageService ]})

@Injectabl 2 Sep 2018 The @Injectable() decorator has the providedIn metadata option, where you can specify the provider of the decorated service class with the root 3 Apr 2019 @Injectable({ providedIn: 'root' }) export class FlightService { constructor(private http: HttpClient) {} [] } This property points to a module and the 26 Nov 2019 We can assign value 'root' to the providedIn property of @Injectable if “Provider , are something which can create or deliver a service to the component. Single- Page Apps(SPA) vs Multi-Page Apps(MPA): What T 16 Nov 2020 In the service above, by specifying providedIn:'root' .

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Angular Interview Question: providedIn vs providers Array, By default, when created with the Angular cli, services are provided in the root injector, which creates one instance that is available across the Using providedIn: LazyModule will lead to circular dependencies warning but luckily there is a easy solution!.

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