Womens As Picture Dresses Dress Evening Elegant Sleeveless Jaycargogo Maxi Embroidery xqwdZOx8H
Preferhouse Cap Sleeve Plus Orange Size Of Mother The Length Bride s Women Knee Dress Women Of Plus Bride The Preferhouse Mother Size Sleeve Dress Knee Length Cap s Orange

Dress Cap The Mother Sleeve Length Plus Of s Women Size Orange Preferhouse Bride Knee PYFqUU

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