Injectable
A marker metadata that marks a class as available to Injector for creation.
| Option | Description |
|---|---|
providedIn
|
Description
For more details, see the "Dependency Injection Guide".
Usage notes
Example
@Injectable()
class UsefulService {
}
@Injectable()
class NeedsService {
constructor(public service: UsefulService) {}
}
const injector = ReflectiveInjector.resolveAndCreate([NeedsService, UsefulService]);
expect(injector.get(NeedsService).service instanceof UsefulService).toBe(true);
Injector will throw an error when trying to instantiate a class that
does not have @Injectable marker, as shown in the example below.
class UsefulService {}
class NeedsService {
constructor(public service: UsefulService) {}
}
expect(() => ReflectiveInjector.resolveAndCreate([NeedsService, UsefulService])).toThrow();