Chiffon Gowns Shoulder Prom Orange Botong Party Bridesmaid One Dresses fxqAAg6wT
s Chiffon Dress V AK Women Prom Beauty Gray Deep Length Floor Bridesmaid Chiffon Length Floor AK V s Gray Dress Bridesmaid Beauty Women Deep Prom

Women AK Dress Length s Deep Floor Beauty Prom Gray V Chiffon Bridesmaid B4qrwB5

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