For Marylin For Flip Wallet S9 Samsung Dress Galaxy Cover Samsung ZR4dwqZ
Facioun Indian Traditonal Women Partywear Multi Ethnic Da Kameez Salwar Designer Partywear Multi Salwar Traditonal Kameez Designer Facioun Da Women Indian Ethnic

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