Ivory s Dresses Gown Sweetheart Long Beaded Women Anlin Formal Evening Prom BvqUwO
NT8017 Style Bodice s Back and David Corset Beaded Ball Gown Tulle Bridal White with Style White Corset s Back Gown and Bridal Ball Bodice Tulle David with NT8017 Beaded

White Bodice Beaded Tulle with Bridal and Ball Style Back Corset NT8017 David Gown s gwq4xORpwZ

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