Strap Cocktail 5 Spaghetti Jaycargogo s Warp Women Party Bodycon Dress xzttfYqwEF
Kameez Ethnic Facioun Salwar Designer Women Traditonal Partywear Indian Multi Da Multi Facioun Da Designer Indian Ethnic Partywear Kameez Salwar Women Traditonal

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