Bridesmaid Anlin s Long AN269 Waist Maxi Burgundy Gown Strapless Women Empire Dress Evening wrpYqRw5n
Long Cromoncent Women s Dress Black See Through Splice Midi Sexy Summer Lace Sleeve s Midi Dress Cromoncent Sexy Lace Long See Women Through Splice Black Summer Sleeve

Through Splice Sexy Lace Women s Long Dress Black Cromoncent Midi See Sleeve Summer OZxqyTw

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