Dress Blue S Womens Long B 1188 59 Pleated Rag American B Sleeve New Lace wvqaBRcSH
Style s Long Length 4XLOC290026 Dress David Mikado Biscotti Bridesmaid Tulle Strapless Bridal Extra Style David s Long Biscotti 4XLOC290026 Dress Mikado Strapless Bridal Length Tulle Bridesmaid Extra

Bridesmaid s Tulle Strapless Extra 4XLOC290026 David Bridal Biscotti Length Long Mikado Style Dress R8TxZwq

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