Lace Vintage Neck Wine Pleated Dress Party Short Cocktail Sleeve Dress Boat Women Lingjiu Summer Red nTwxEE
Long Line Piece Two Dress Evening Bridesmaid Prom With Pocket A Dressylady Champagne Keyhole Champagne Long Dress Prom Evening Line Bridesmaid With A Pocket Two Piece Dressylady Keyhole

Evening Two Bridesmaid Line Pocket Dressylady Keyhole A With Prom Champagne Long Piece Dress 8Hdxwq

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