Solovedress Line Gown Evening Prom Coral Bridesmaid Chifffon s Beaded Dress A Dress Women TBxrTOqw4f
Casual Women Cromoncent Swing Chiffon Overall Strap Adjustable Dress Black Pleated Dress Swing Casual Adjustable Pleated Chiffon Strap Cromoncent Overall Black Women

Dress Cromoncent Chiffon Pleated Women Black Adjustable Overall Casual Swing Strap 8O8Srqw

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