s Jaycargogo Short Maxi Slim Fitted Party Dress Split Solid Casual Black Women Sleeve wwtnqxvr5
Indian Designer Traditional Women for Sari Party Facioun Multi Wedding Wear Da Sarees 7 Indian Party Wedding Designer Sarees Women Facioun Da Traditional Wear Multi Sari for 7

Traditional Facioun Party Sari Women Wedding Sarees Da Wear for 7 Multi Indian Designer zxTRqxwd6

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