Chiffon Dress Jack Bright Crinkle Dakota White Maxi Joyner s Printed by Women BB URU48va
Cromoncent Neck Long Sleeve Fit Baggy Women Red Cartoon Crew Wine Dress Casual Print Mini s Cartoon s Wine Baggy Mini Sleeve Women Red Crew Cromoncent Dress Neck Fit Print Casual Long

Crew Cartoon Red Wine Baggy Print Long Dress Sleeve Cromoncent Mini Women s Neck Fit Casual Hqw8OTUE

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