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docs: remove the section "Using components vs services from other modules" (#41835)

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This section states that "Importing a module with services means that you will have a new instance of that service". This is only true for lazy-loaded `NgModules`. For non-lazy-loaded modules, my understanding is that the providers arrays are flattened into the root injector meaning that importing a module with a service doesn't create a new instance of that service.

PR Close #41835
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Amadou Sall 2021-04-27 12:27:34 +02:00 committed by Jessica Janiuk
parent 01d1c46b16
commit 3783976543
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aio/content/guide/sharing-ngmodules.md
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@ -41,18 +41,6 @@ to import `FormsModule`, `SharedModule` can still export
way, you can give other modules access to `FormsModule` without way, you can give other modules access to `FormsModule` without
having to import it directly into the `@NgModule` decorator. having to import it directly into the `@NgModule` decorator.
### Using components vs services from other modules
There is an important distinction between using another module's component and
using a service from another module. Import modules when you want to use
directives, pipes, and components. Importing a module with services means that you will have a new instance of that service, which typically is not what you need (typically one wants to reuse an existing service). Use module imports to control service instantiation.
The most common way to get a hold of shared services is through Angular
[dependency injection](guide/dependency-injection), rather than through the module system (importing a module will result in a new service instance, which is not a typical usage).
To read about sharing services, see [Providers](guide/providers).
## More on NgModules ## More on NgModules
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