Rose Diesel Dress Water Womens D Diesel Womens Edina Xrr1gYH
Maxi Linen Green Coolred Chinese Style Fake Two Patterned Dress Women Pieces Fake Two Style Maxi Linen Green Coolred Chinese Pieces Women Patterned Dress

Pieces Two Fake Women Dress Chinese Style Patterned Coolred Green Maxi Linen TqPIwwZ

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