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@angular/corecode
Injectable
decorator
Decorator that marks a class as available to be provided and injected as a dependency.
Introduction to Services and DICreating and using servicesDefining dependency providersUsage Notes
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);Jump to details