waist Inclined Simple Mid Coolred Shoulder Light Solid Dresses Women Career Green Hi Xxgwptq
Size 4 Dress Maxi Blue Floral Casual Girls 14 Caitefaso Pockets Light Waisted High Pleated Dress 4 Size High Waisted Blue Pockets Pleated Casual Girls 14 Floral Light Maxi Caitefaso

Size Light Floral 4 14 Casual Pockets Pleated Blue Waisted Caitefaso High Dress Maxi Girls zxZv5Pwq7B

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