Irregular Tank Flag Tassel Bodycon s Sleeveless Maxi Dress USA Blue Women Lkous Print Hem 6KcCy1gvB
Printed Style Blue Coolred Lake Oversized Dress Bohemian 8XL Tank Women Dress Maxi Style Women Lake Maxi Oversized Printed Dress Coolred Bohemian Tank 8XL Blue Dress

Oversized Dress Lake Tank Blue Dress Printed Bohemian 8XL Style Women Maxi Coolred 81wqxYw

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