Party Wine Red Sleeveless Dovetail Coolred Evening Dress Lacework Delicate s Women qvxxwPzX
Carven 34 Dress Asymmetrical Carven Navy Hem 34 Hem Asymmetrical Dress Navy Carven Dress 34 Asymmetrical 34 Navy Hem Carven Carven Carven Hem Asymmetrical Dress Navy

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