Bridesmaid Women Long Tulle Prom Dress Sleeveless Purple BessWedding Sexy Sweetheart 1 s BR0qC
Color Square Stain Neckline Dresses Blush dresses Prom Bridesmaid Dress Long e Luxury Dress Square Stain Blush Long Neckline Prom e Dresses Color Bridesmaid Luxury dresses

Color Square Dress Neckline Luxury dresses Bridesmaid Stain Prom Dresses Blush e Long wrx7wtR

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