Cromoncent Sexy High Midi Dress Waist Club Bodycon Womens Green Shoulder One Blackish fprwnZqp
Mischka Mischka Skirted Back Dress Badgley Green Floral Sleeveless Open Badgley Dress Mischka Green Back Badgley Skirted Floral Open Badgley Mischka Sleeveless

Badgley Skirted Floral Back Open Sleeveless Dress Mischka Mischka Green Badgley 6nvpw06dq

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