Custom getters with freezed throw errors with dartz about reactive_forms_generator HOT 22 CLOSED

import 'package:flutter/material.dart';
import 'package:reactive_forms/reactive_forms.dart';
import 'package:reactive_forms/src/widgets/inherited_streamer.dart';
import 'package:dartz/dartz.dart' as dartz;
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:reactive_forms_annotations/reactive_forms_annotations.dart';

part 'test.freezed.dart';
part 'test.gform.dart';

@freezed
@ReactiveFormAnnotation()
class Test with _$Test {
  const Test._();
  const factory Test({
    @FormControlAnnotation() required String title,
    @FormControlAnnotation() String? description,
  }) = _Test;

  factory Test.empty() => Test(
        title: '',
        description: '',
      );
  // The error occurs with this grrr
  dartz.Option<String> get failureOption {
    if (title.isEmpty) {
      return dartz.some('Cannot be empty');
    } else {
      return dartz.none();
    }
  }
}

// GENERATED CODE - DO NOT MODIFY BY HAND

// **************************************************************************
// ReactiveFormsGenerator
// **************************************************************************

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:reactive_forms/reactive_forms.dart';
import 'package:reactive_forms/src/widgets/inherited_streamer.dart';
import 'package:dartz/dartz.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:reactive_forms_annotations/reactive_forms_annotations.dart';
import 'dart:core';
part 'test.dart';

class ReactiveTestFormConsumer extends StatelessWidget {
  ReactiveTestFormConsumer({Key? key, required this.builder, this.child}) : super(key: key);

  final Widget? child;

  final Widget Function(BuildContext context, TestForm formModel, Widget? child) builder;

  @override
  Widget build(BuildContext context) {
    final formModel = ReactiveTestForm.of(context);

    if (formModel is! TestForm) {
      throw FormControlParentNotFoundException(this);
    }
    return builder(context, formModel, child);
  }
}

class TestFormInheritedStreamer extends InheritedStreamer<dynamic> {
  TestFormInheritedStreamer({Key? key, required this.form, required Stream<dynamic> stream, required Widget child}) : super(stream, child, key: key);

  final TestForm form;
}

class ReactiveTestForm extends StatelessWidget {
  ReactiveTestForm({Key? key, required this.form, required this.child, this.onWillPop}) : super(key: key);

  final Widget child;

  final TestForm form;

  final WillPopCallback? onWillPop;

  static TestForm? of(BuildContext context, {bool listen = true}) {
    if (listen) {
      return context.dependOnInheritedWidgetOfExactType<TestFormInheritedStreamer>()?.form;
    }

    final element = context.getElementForInheritedWidgetOfExactType<TestFormInheritedStreamer>();
    return element == null ? null : (element.widget as TestFormInheritedStreamer).form;
  }

  @override
  Widget build(BuildContext context) {
    return TestFormInheritedStreamer(
      form: form,
      stream: form.form.statusChanged,
      child: WillPopScope(
        onWillPop: onWillPop,
        child: child,
      ),
    );
  }
}

class TestFormBuilder extends StatefulWidget {
  TestFormBuilder({Key? key, required this.model, this.child, this.onWillPop, required this.builder}) : super(key: key);

  final Test model;

  final Widget? child;

  final WillPopCallback? onWillPop;

  final Widget Function(BuildContext context, TestForm formModel, Widget? child) builder;

  @override
  _TestFormBuilderState createState() => _TestFormBuilderState();
}

class _TestFormBuilderState extends State<TestFormBuilder> {
  late FormGroup _form;

  late TestForm _formModel;

  @override
  void initState() {
    _form = FormGroup({});
    _formModel = TestForm(widget.model, _form, null);

    _form.addAll(_formModel.formElements().controls);

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return ReactiveTestForm(
      form: _formModel,
      onWillPop: widget.onWillPop,
      child: ReactiveForm(
        formGroup: _form,
        onWillPop: widget.onWillPop,
        child: widget.builder(context, _formModel, widget.child),
      ),
    );
  }
}

class TestForm {
  TestForm(this.test, this.form, this.path) {}

  static String titleControlName = "title";

  final Test test;

  final FormGroup form;

  final String? path;

  String titleControlPath() => pathBuilder(titleControlName);
  String get titleValue => titleControl.value as String;
  bool get containsTitle => form.contains(titleControlPath());
  Object? get titleErrors => titleControl.errors;
  void get titleFocus => form.focus(titleControlPath());
  void titleRemove({bool updateParent = true, bool emitEvent = true}) =>
      form.removeControl(titleControlPath(), updateParent: updateParent, emitEvent: emitEvent);
  void titleValueUpdate(String value, {bool updateParent = true, bool emitEvent = true}) =>
      titleControl.updateValue(value, updateParent: updateParent, emitEvent: emitEvent);
  void titleValuePatch(String value, {bool updateParent = true, bool emitEvent = true}) =>
      titleControl.patchValue(value, updateParent: updateParent, emitEvent: emitEvent);
  void titleValueReset(String value, {bool updateParent = true, bool emitEvent = true, bool removeFocus = false, bool? disabled}) =>
      titleControl.reset(value: value, updateParent: updateParent, emitEvent: emitEvent);
  FormControl<String> get titleControl => form.control(titleControlPath()) as FormControl<String>;
  Test get model => Test(title: titleValue, description: test.description);
  void updateValue(Test value, {bool updateParent = true, bool emitEvent = true}) =>
      form.updateValue(TestForm(value, FormGroup({}), null).formElements().rawValue, updateParent: updateParent, emitEvent: emitEvent);
  void resetValue(Test value, {bool updateParent = true, bool emitEvent = true}) =>
      form.reset(value: TestForm(value, FormGroup({}), null).formElements().rawValue, updateParent: updateParent, emitEvent: emitEvent);
  void reset({bool updateParent = true, bool emitEvent = true}) =>
      form.reset(value: this.formElements().rawValue, updateParent: updateParent, emitEvent: emitEvent);
  String pathBuilder(String? pathItem) => [path, pathItem].whereType<String>().join(".");
  FormGroup formElements() => FormGroup({
        titleControlName: FormControl<String>(
            value: test.title, validators: [], asyncValidators: [], asyncValidatorsDebounceTime: 250, disabled: false, touched: false)
      }, validators: [], asyncValidators: [], asyncValidatorsDebounceTime: 250, disabled: false);
}

// coverage:ignore-file
// GENERATED CODE - DO NOT MODIFY BY HAND
// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target

part of 'test.dart';

// **************************************************************************
// FreezedGenerator
// **************************************************************************
[...]

import 'package:flutter/material.dart';
import 'package:reactive_forms/reactive_forms.dart';
import 'package:reactive_forms/src/widgets/inherited_streamer.dart';

import 'package:reactive_forms_annotations/reactive_forms_annotations.dart';

import 'package:dartz/dartz.dart' as dartz;
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:reactive_forms_annotations/reactive_forms_annotations.dart';

part 'group.freezed.dart';
part 'group.gform.dart';