Injectable

A marker metadata that marks a class as available to Injector for creation.

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Option	Description
providedIn

Description

For more details, see the "Dependency Injection Guide".

Options

providedIn
providedIn: Type<any> | 'root' | null

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();