Tulle Gowns Short Babyonline Appliques s Women Cocktail Evening Sleeveless Red wxtpf
Heart Lettuce Bodice Surplus Juniors Dress Edge Derek Stripe Blue Skater Dress Edge Heart Surplus Bodice Juniors Lettuce Derek Blue Stripe Skater

Stripe Blue Dress Lettuce Heart Bodice Skater Juniors Edge Surplus Derek fqwIgxPzg

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