add dart project to repo and add equatable options

dart-result/.gitignore

@@ -0,0 +1,6 @@
+# Files and directories created by pub.
+.dart_tool/
+.packages
+
+# Conventional directory for build output.
+build/

dart-result/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 1.0.0
+
+- Initial version.

dart-result/README.md

@@ -0,0 +1,2 @@
+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.

dart-result/analysis_options.yaml

@@ -0,0 +1,30 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

dart-result/lib/dart_result.dart

@@ -0,0 +1 @@
+void main() {}

output_serialization.dart → dart-result/lib/output_serialization.dart

@@ -2,7 +2,7 @@ import 'package:json_annotation/json_annotation.dart';
 
 part 'filename.g.dart';
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class MyClass {
     MyClass({
         required this.valInt,
@@ -61,14 +61,19 @@ class MyClass {
 
     factory MyClass.fromJson(Map<String, dynamic> json) => _$MyClassFromJson(json);
 
+    Map<String, dynamic> toJson() => _$MyClassToJson(this);
+
     @override
     String toString(){
     return '$valInt, $valBool, $valDate, $valString, $valNull, $valDouble, $valArrInt, $valueArrEmpty, $valueObjEmpty, $valArrString, $valObj, $valObjInObj, $valArrObj';
     }
 
+    @override
+    List<Object?> get props => [
+    valInt, valBool, valDate, valString, valNull, valDouble, valArrInt, valueArrEmpty, valueObjEmpty, valArrString, valObj, valObjInObj, valArrObj, ];
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ValArrObj {
     ValArrObj({
         required this.dog,
@@ -84,14 +89,19 @@ class ValArrObj {
 
     factory ValArrObj.fromJson(Map<String, dynamic> json) => _$ValArrObjFromJson(json);
 
+    Map<String, dynamic> toJson() => _$ValArrObjToJson(this);
+
     @override
     String toString(){
     return '$dog, $cat, $hehe, $test';
     }
 
+    @override
+    List<Object?> get props => [
+    dog, cat, hehe, test, ];
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ValObj {
     ValObj({
         required this.street,
@@ -103,14 +113,19 @@ class ValObj {
 
     factory ValObj.fromJson(Map<String, dynamic> json) => _$ValObjFromJson(json);
 
+    Map<String, dynamic> toJson() => _$ValObjToJson(this);
+
     @override
     String toString(){
     return '$street, $city';
     }
 
+    @override
+    List<Object?> get props => [
+    street, city, ];
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ValObjInObj {
     ValObjInObj({
         required this.street,
@@ -124,14 +139,19 @@ class ValObjInObj {
 
     factory ValObjInObj.fromJson(Map<String, dynamic> json) => _$ValObjInObjFromJson(json);
 
+    Map<String, dynamic> toJson() => _$ValObjInObjToJson(this);
+
     @override
     String toString(){
     return '$street, $city, $province';
     }
 
+    @override
+    List<Object?> get props => [
+    street, city, province, ];
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Province {
     Province({
         required this.country,
@@ -145,22 +165,32 @@ class Province {
 
     factory Province.fromJson(Map<String, dynamic> json) => _$ProvinceFromJson(json);
 
+    Map<String, dynamic> toJson() => _$ProvinceToJson(this);
+
     @override
     String toString(){
     return '$country, $population, $something';
     }
 
+    @override
+    List<Object?> get props => [
+    country, population, something, ];
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ValueObjEmpty {
     ValueObjEmpty();
 
     factory ValueObjEmpty.fromJson(Map<String, dynamic> json) => _$ValueObjEmptyFromJson(json);
 
+    Map<String, dynamic> toJson() => _$ValueObjEmptyToJson(this);
+
     @override
     String toString(){
     return '';
     }
 
+    @override
+    List<Object?> get props => [
+    ];
 }