Mini Bandage Back White Bodycon s Club Strap Spaghetti Women Sexy Dress Jaycargogo qxYX87pw
Womens Midi Plaid Checkerboard Bodycon Dress Club Cromoncent Sexy Red Womens Dress Sexy Cromoncent Midi Club Red Checkerboard Plaid Bodycon

Plaid Red Checkerboard Club Womens Sexy Cromoncent Midi Bodycon Dress ERwfFTq

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