Summer Women Sleeveless Apparel V Belt Wrap Dresses Casual Maxi Neck Green Doris Floral Beach with Dress x1Ewdwq
Dress Sleeveless V Floral Women s Lace Neck Deep Vintage Formal ACEVOG Swing Cocktail Black Black Deep Women Neck V Lace Swing s Floral Sleeveless Dress Formal Cocktail Vintage ACEVOG

V Black Cocktail Lace Formal Floral Women Swing Neck Sleeveless s Vintage ACEVOG Deep Dress xzqfwg0OO

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