Coolred Sexy Khaki Nightclub Skinny Dress Womens Solid Mid Stretchy Fashion TvxwnT7qrR
Black Rope Shorts Belt for Waistband Braid Womens Candy Girdle Color Thin Dress Color Shorts Braid Candy Thin for Womens Dress Rope Belt Girdle Waistband Black

Rope Dress for Womens Waistband Belt Shorts Color Braid Candy Thin Black Girdle 1ZAqxaTw

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