Dress Women Straps Out Coolred Solid Yellow Lapel Maxi Buckle Cut 81wFq4
Strapless Biscotti Style Bridesmaid Mikado Extra 4XLOC290026 Length David Bridal Long s Tulle Dress Mikado Length Bridesmaid David Dress Tulle Biscotti Bridal Strapless Extra Style s Long 4XLOC290026

Bridesmaid s Tulle Strapless Extra 4XLOC290026 David Bridal Biscotti Length Long Mikado Style Dress R8TxZwq

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