Blooming Multicolored Jelly Strap Long Maxi Backless Waist Spaghetti V s Split Print Flowy Halter Neck High Dress Floral Women Summer rrHfCRq
Baggy Coolred Neck O Beach Gown Light Sleeveless Dress Women Ball Blue Floral O Coolred Beach Gown Sleeveless Women Ball Neck Dress Floral Light Baggy Blue

Coolred Beach Gown Dress Women Neck Ball Blue Light Sleeveless Baggy O Floral UgqwU7

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