Pinkdose Accessories Flower Flower Free Wedding Hair Artifical 50Pcs Ball Light Imitation Shipping Big Flowers Rose Pink DIY Heads 8Cm Dress for rRzErCqw
Women Club Bandage s Chest Cami Bodycon Dress Comfy Wrapped Back Sexy Open Black Wrapped Cami s Open Dress Comfy Black Chest Sexy Bandage Bodycon Back Women Club

Bodycon Black Cami Club Women Back Comfy Dress Open Chest s Sexy Wrapped Bandage wqtxnO7R

A constructor parameter decorator that marks a dependency as optional.

See also

Description

The DI framework provides null if the dependency is not found. For example, the following code allows the possibility of a null result:

class Engine {} @ Injectable() class Car { constructor(@ Optional() public engine: Engine) {} } const injector = ReflectiveInjector.resolveAndCreate([Car]); expect(injector.get(Car).engine).toBeNull();
      
      class Engine {}

@Injectable()
class Car {
  constructor(@Optional() public engine: Engine) {}
}

const injector = ReflectiveInjector.resolveAndCreate([Car]);
expect(injector.get(Car).engine).toBeNull();
    

Options