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Length 4XLF19279 Dress Bridesmaid Length Marine Strapless Extra Extra Mikado Style Extra Length Mikado Dress Extra Marine Style 4XLF19279 Bridesmaid Strapless Length

Dress Strapless Extra Style Bridesmaid Length Marine Length 4XLF19279 Mikado Extra wYOH7

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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