Halter Shorts Size Cytree Tankini S Swimdress 5XL Back Womens Womens Waist and Swimsuit Black High Open wEfx7qfn0
Tassel Blouses Off Shoulder Aliven Shirt s Sleeve Top One White White Women Long Off Shoulder White Long Blouses Shirt Tassel White Top s Aliven Women One Sleeve

Blouses Top s One Aliven Off Shirt Sleeve Tassel Women White Shoulder White Long 1qZHvAPw

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