// myCardValidator.ts

const MyCardValidatorType = new CardValidatorType(
  '9a32e86b-7c82-4413-9c83-882a516abada',
  'MyCardValidator'
);

const MyValidationKey = new ValidationKey(
  'd57ef1a1-cfcd-0852-8a2c-ce527bc02aac',
  'MyValidationKey',
  'Card is not valid'
);

@injectable()
export class MyCardValidator implements ICardValidator {
  async validate(context: CardValidationContext, validator: CardTypeValidator): Promise<void> {
    if (/*some expr*/) {
      ValidationSequence
        .begin(context.getCardValidator())
        .setObjectType('MyCardValidator')
        .error(MyValidationKey)
        .end();
    }
  }
}

// registrator.ts

export const Registrator: ExtensionRegistrator = {
  async registerTypes(container) {
    CardValidatorTypeRegistry.instance.register(MyCardValidatorType);
    ValidationKeyRegistry.instance.register(key);
    container
      .bind(ICardValidator$)
      .to(MyCardValidator)
      .whenTargetNamed(MyCardValidatorType.id);
  }
}