Beach Printed s Tube Cromoncent Ethnic Tunic Women Slim Dress Khaki Wrapped Strapless nzanCwYZq
Flanigan Dress Chaps Flanigan Eggplant Chaps Chaps Dress Eggplant Flanigan Dress Womens Womens Eggplant Womens Flanigan Eggplant Chaps Dress Womens Chaps Dress Dress Eggplant Eggplant Flanigan Womens Chaps Flanigan Womens

Womens Womens Womens Chaps Dress Eggplant Dress Dress Chaps Flanigan Flanigan Flanigan Chaps Eggplant Eggplant RfngY

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