decorator
Decorator that marks a class as available to be provided and injected as a dependency.
Option | Description |
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providedIn? |
Determines which injectors will provide the injectable, by either associating it with an
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providedIn |
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Determines which injectors will provide the injectable, by either associating it with an
|
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Marking a class with @Injectable
ensures that the compiler will generate the necessary metadata to create the class's dependencies when the class is injected.
The following example shows how a service class is properly marked so that a supporting service can be injected upon creation.
@Injectable() class UsefulService { } @Injectable() class NeedsService { constructor(public service: UsefulService) {} } const injector = Injector.create({ providers: [{provide: NeedsService, deps: [UsefulService]}, {provide: UsefulService, deps: []}] }); expect(injector.get(NeedsService).service instanceof UsefulService).toBe(true);
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https://v10.angular.io/api/core/Injectable