blue s JONES Business Men 5248 Casual PAUL Dress Long Shirts Sleeves Rqv1xnw
Carven Asymmetrical Navy Hem Carven Dress Asymmetrical 34 Navy Carven Hem 34 Dress Hem Navy Carven Dress 34 Navy Asymmetrical 34 Hem Carven Dress Carven Asymmetrical

Dress Asymmetrical Navy Navy Carven Carven Hem Asymmetrical 34 34 Hem Carven Dress g7pZq

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