Angel Pleated Formal Gown Dress Bridesmaid Grape 2015 Chiffon Bride New rw0qUCrx
Coolred Sexy Shoulder Party Evening Color Black Pure Word Women One Dress Flounced Sexy Shoulder Color Flounced Dress Evening Black One Women Coolred Word Pure Party

One Evening Sexy Pure Black Coolred Flounced Dress Color Party Women Word Shoulder Z7XznxqBTW

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