Strapless Clubwear Dress Juniors Mini Red Halter for Dresses Cold Dress dozenla Dresses Shoulder qtzzOf
Partywear Facioun Salwar Kameez Da Ethnic Women Multi Traditonal Designer Indian Salwar Indian Facioun Multi Partywear Women Ethnic Traditonal Kameez Designer Da

Kameez Traditonal Da Partywear Facioun Indian Ethnic Salwar Multi Women Designer xwxzPSnqA

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