Ethnic Gajari Da 5 Partywear Women Indian Choli Facioun Lehenga Traditional Designer wOaq7xX1P
Sleeve s Cromoncent Black Midi Summer Long See Dress Women Through Lace Sexy Splice Summer Women Cromoncent Midi See Splice Dress s Sexy Sleeve Black Through Lace Long

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