Plain Front Irregular Dress Casual Womens Cruiize Chiffon Grey Solid Button txqfOPAw0
Chiffon Low Gowns Short of Bridesmaid Wedding Halter Honor Maid High Fuchsia Cdress Dresses High Short Gowns Halter Chiffon Maid of Dresses Fuchsia Wedding Bridesmaid Low Honor Cdress

Short High Bridesmaid Halter Wedding Fuchsia Chiffon Dresses Low Gowns Honor Cdress of Maid XpFfW

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