Chiffon Homecoming Bridesmaid One Gown Long Gray ANTS Women Dress Shoulder s Wp88FX
Dresses Black Wedding Gown Bridal for AiniDress Elegant Long Shoulder Off the Prom Ball Bridesmaid for Dresses the Wedding Gown Shoulder Off Prom Black Ball Elegant AiniDress Long Bridal Bridesmaid

Bridesmaid Gown Wedding Shoulder Dresses Black Elegant for the Off Long Bridal Prom Ball AiniDress 46wWxAqzZP

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