s Long Simplee Wine Women Dress Up Lace Backless Apparel Maxi Satin Sequin Dress 7qEEOInZ
Dress Bess Bridal Short Sky Blue Women s Party Sexy Cocktail Lace Mini Lace Bess Sexy Dress Bridal Cocktail Short Mini Blue Women s Sky Party

Blue Dress Short Cocktail s Women Party Bridal Sky Mini Sexy Lace Bess nZqPgwOx

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