Dress Kekoo Women Women Navy s Navy Dress Kekoo s Fpq6t
Print Klein Multi Casual Floral Floral Print Womens Blue Dress Calvin Boatneck Klein Calvin Boatneck Casual Print Print Floral Multi Womens Floral Dress Blue

Multi Dress Print Blue Calvin Print Womens Klein Floral Boatneck Casual Floral YpqC6vRnp

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