Sleeve Package Dresses Hip Neck Women Slim Apricot Pure V Jaycargogo Short Fitted Color Metallic Z4nIW7g
Coolred Dress Length Slim Plaid Blue Stripe Color Irregular Mid Women Spell Dress Women Plaid Mid Coolred Slim Blue Color Irregular Length Spell Stripe

Coolred Plaid Color Length Mid Dress Blue Irregular Women Spell Stripe Slim 8rYrOIq

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();
    

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