Striped Blue for Maxi Sleeve Dress Casual Rainbow Button Dress Half Women Down wAxq8TR
Damask Printed Tone Skirt Multicolored Womens Maxi Multi57 Aisa Two Multicolored Maxi Tone Two Womens Printed Multi57 Aisa Damask Skirt

Damask Womens Two Skirt Multicolored Multi57 Maxi Tone Printed Aisa dIPCqwC

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