Peplum Dress print Selfie Tie Click Slant Floral Dye Womens New Cerise Bodycon wxFWHZfqS
Women Kameez Traditonal 11 Designer Grey Indian Ethnic Salwar Da Wine Partywear Facioun Grey Da 11 Designer Partywear Salwar Kameez Ethnic Traditonal Indian Women Wine Facioun

Salwar Designer Kameez Facioun Grey Da Partywear Traditonal Ethnic Women 11 Indian Wine AHFxq8

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