Strap Spaghetti Dress Womens Mini Stripe Bodycon Jaycargogo 1 Irregular qE75ddw
Off the Shoulder Prom Fuchsia Gorgeous Evening Dress Dress Avril Mermaid Beading Satin Gorgeous Fuchsia Beading Shoulder Avril Off Evening Prom Mermaid Satin Dress the Dress

Fuchsia Gorgeous Shoulder Mermaid Avril Dress Prom the Off Satin Evening Dress Beading B5qwPS

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