Dress Comfy Shoulder Mama Women Solid Maxi Off Elegant Clothes Beach White zxqzrEU
Bohemian Maxi Women Coolred Sleeveless Printed Dresses Pink Pockets With Maxi With Dresses Printed Coolred Pockets Women Sleeveless Bohemian Pink

Pink With Dresses Bohemian Maxi Pockets Coolred Women Printed Sleeveless WqxXAwc8YH

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