[Vue] Vuelidate object property에 validation 적용 방법

public class Exaplme extends Vue {
  private signupInfo: ISignupInfo = {
    email: "",
    password: "",
    name: ""
  };

  @Validations()
  validations = {
    signupInfo: {
      email: { required, email },
      password: { required, minLength: minLength(4) },
      name: { required }
    },
    passwordCheck: { required, minLength: minLength(4) }
  };
}