Deep Long Dress Bridal V Watermelon Bess Evening Prom Formal Chiffon s Women Neck qAcyfRpy
Neck Womens Solid Scoop Slim Dress Midi Club 2 Bodycon Fit Domple Sleeve Short Neck Dress Fit Womens Sleeve Short Domple Scoop Solid Midi Club Slim 2 Bodycon

Club 2 Solid Fit Slim Bodycon Scoop Womens Midi Domple Dress Short Sleeve Neck U8pyaq

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