Strapless s Women Cocktail Coral Dress Prom Short ANTS Gown Chiffon Party f1w4qnfE
White White White Acevog Acevog White White Acevog Acevog Acevog Acevog White Acevog Acevog White White Acevog White White Acevog

Acevog Acevog White White Acevog White White Acevog White Acevog qPUTApn

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