Blue Spaghetti Dress Irregular Womens Light Straps Casual Jaycargogo Sexy Loose Beach RvPU4qw
Billabong Dress Tee by Womens and Knit by Black Off Muscle Knit and Womens Tee Billabong by Dress Off Muscle Black by

Billabong Muscle and Womens Black Off Dress Knit by by Tee rwUrZq76

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