Knee Women Dress Sexy Lotus Party Above Black Hem Decor Tassels Lace Buedvo Skirt U8U5wr
Button Dress Details Long Swing Floral Strap Spaghetti Pink Cromoncent Womens Waist High High Button Womens Floral Long Pink Dress Details Spaghetti Waist Swing Strap Cromoncent

Details Cromoncent High Waist Long Womens Dress Swing Floral Spaghetti Button Pink Strap wfXxqfp

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