Women Dress Lace Lilac Bridal Organza Short s Prom Homecoming Bess Graduation Party Zw5vHqxnw
Plus Short Dresses Cold Sleeve Size Women Sexy Light Shoulder Blue Glitter Lace Long Coolred Cold Shoulder Size Glitter Lace Short Light Sleeve Blue Coolred Dresses Long Sexy Plus Women

Dresses Light Women Lace Sexy Shoulder Long Plus Blue Size Glitter Cold Coolred Short Sleeve 1dAPq7wx7

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