Halter Club Dress Bodycon Sequin Cromoncent Midi Red Sexy Sleeveless Sparkle Women EqcF0w
Sleeve Neck Solid Deep Dress A Front Womens Line Slim Long Fit V Blue Color Jaycargogo Tie Mini Blue Mini Dress Line Fit Front Tie Solid Long V Jaycargogo Deep Color Neck Sleeve Womens Slim A

Mini Long Blue Solid Color Fit Womens Front A Neck Tie Jaycargogo Deep Slim Sleeve V Line Dress 4gwn6

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