Women Neck TM Swing BetterGirl Fall Sleeve Long Dress Winter Cowl Dress White Maxi Casual FRYaq5
Dress Homecoming Dress Bridesmay Keyhole Tulle Beading Short Prom Coral Bridesmaid Short Bridesmaid Prom Bridesmay Homecoming Dress Dress Coral Beading Keyhole Tulle

Beading Dress Keyhole Bridesmay Tulle Prom Bridesmaid Coral Dress Short Homecoming wEXqRxSWqI

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