Halter Avril Dress Green Cocktail Exquisite Dress Knee Length Chiffon Homecoming Eqvq7r
Dress 3 Plus Floral AMZ Size Red 4 Pockets PLUS Wine Bohemian Sleeve Women Maxi Women Bohemian AMZ Sleeve Wine Plus Size Dress Red PLUS Pockets 4 3 Maxi Floral

Dress Wine Pockets Women Plus Maxi Bohemian Floral Sleeve 3 PLUS 4 Size Red AMZ x7qwgPf4v0

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