[in_app_purchase] Update to the latest pkg:json_serializable (flutter#4434)

- Remove unneeded class now that enum helpers can be generated without one
- Code reorganization
- Remove superflous JsonKey values

Author: kevmoo

packages/in_app_purchase/in_app_purchase/build.yaml

@@ -1,6 +1,12 @@
+## 0.1.6
+
+* Require Dart SDK >= 2.14.
+* Update `json_annotation` dependency to `^4.3.0`.
+
 ## 0.1.5+1
 
 * Fix a broken link in the README.
+
 ## 0.1.5
 
 * Introduced the `SkuDetailsWrapper.introductoryPriceAmountMicros` field of the correct type (`int`) and deprecated the `SkuDetailsWrapper.introductoryPriceMicros` field.

packages/in_app_purchase/in_app_purchase_android/CHANGELOG.md

@@ -1,7 +1,8 @@
+# See https://pub.dev/packages/build_config
 targets:
   $default:
     builders:
       json_serializable:
         options:
           any_map: true
-          create_to_json: true
+          create_to_json: false

packages/in_app_purchase/in_app_purchase_android/build.yaml

@@ -3,14 +3,17 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'package:flutter/services.dart';
+
 import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
 import 'package:json_annotation/json_annotation.dart';
+
 import '../../billing_client_wrappers.dart';
 import '../channel.dart';
 import 'purchase_wrapper.dart';
 import 'sku_details_wrapper.dart';
-import 'enum_converters.dart';
+
+part 'billing_client_wrapper.g.dart';
 
 /// Method identifier for the OnPurchaseUpdated method channel method.
 @visibleForTesting
@@ -364,6 +367,7 @@ typedef void OnBillingServiceDisconnected();
 /// [`BillingClient.BillingResponse`](https://developer.android.com/reference/com/android/billingclient/api/BillingClient.BillingResponse).
 /// See the `BillingResponse` docs for more explanation of the different
 /// constants.
+@JsonEnum(alwaysCreate: true)
 enum BillingResponse {
   // WARNING: Changes to this class need to be reflected in our generated code.
   // Run `flutter packages pub run build_runner watch` to rebuild and watch for
@@ -418,11 +422,32 @@ enum BillingResponse {
   itemNotOwned,
 }
 
+/// Serializer for [BillingResponse].
+///
+/// Use these in `@JsonSerializable()` classes by annotating them with
+/// `@BillingResponseConverter()`.
+class BillingResponseConverter implements JsonConverter<BillingResponse, int?> {
+  /// Default const constructor.
+  const BillingResponseConverter();
+
+  @override
+  BillingResponse fromJson(int? json) {
+    if (json == null) {
+      return BillingResponse.error;
+    }
+    return $enumDecode(_$BillingResponseEnumMap, json);
+  }
+
+  @override
+  int toJson(BillingResponse object) => _$BillingResponseEnumMap[object]!;
+}
+
 /// Enum representing potential [SkuDetailsWrapper.type]s.
 ///
 /// Wraps
 /// [`BillingClient.SkuType`](https://developer.android.com/reference/com/android/billingclient/api/BillingClient.SkuType)
 /// See the linked documentation for an explanation of the different constants.
+@JsonEnum(alwaysCreate: true)
 enum SkuType {
   // WARNING: Changes to this class need to be reflected in our generated code.
   // Run `flutter packages pub run build_runner watch` to rebuild and watch for
@@ -437,13 +462,34 @@ enum SkuType {
   subs,
 }
 
+/// Serializer for [SkuType].
+///
+/// Use these in `@JsonSerializable()` classes by annotating them with
+/// `@SkuTypeConverter()`.
+class SkuTypeConverter implements JsonConverter<SkuType, String?> {
+  /// Default const constructor.
+  const SkuTypeConverter();
+
+  @override
+  SkuType fromJson(String? json) {
+    if (json == null) {
+      return SkuType.inapp;
+    }
+    return $enumDecode(_$SkuTypeEnumMap, json);
+  }
+
+  @override
+  String toJson(SkuType object) => _$SkuTypeEnumMap[object]!;
+}
+
 /// Enum representing the proration mode.
 ///
 /// When upgrading or downgrading a subscription, set this mode to provide details
 /// about the proration that will be applied when the subscription changes.
 ///
 /// Wraps [`BillingFlowParams.ProrationMode`](https://developer.android.com/reference/com/android/billingclient/api/BillingFlowParams.ProrationMode)
 /// See the linked documentation for an explanation of the different constants.
+@JsonEnum(alwaysCreate: true)
 enum ProrationMode {
 // WARNING: Changes to this class need to be reflected in our generated code.
 // Run `flutter packages pub run build_runner watch` to rebuild and watch for
@@ -477,7 +523,28 @@ enum ProrationMode {
   deferred,
 }
 
+/// Serializer for [ProrationMode].
+///
+/// Use these in `@JsonSerializable()` classes by annotating them with
+/// `@ProrationModeConverter()`.
+class ProrationModeConverter implements JsonConverter<ProrationMode, int?> {
+  /// Default const constructor.
+  const ProrationModeConverter();
+
+  @override
+  ProrationMode fromJson(int? json) {
+    if (json == null) {
+      return ProrationMode.unknownSubscriptionUpgradeDowngradePolicy;
+    }
+    return $enumDecode(_$ProrationModeEnumMap, json);
+  }
+
+  @override
+  int toJson(ProrationMode object) => _$ProrationModeEnumMap[object]!;
+}
+
 /// Features/capabilities supported by [BillingClient.isFeatureSupported()](https://developer.android.com/reference/com/android/billingclient/api/BillingClient.FeatureType).
+@JsonEnum(alwaysCreate: true)
 enum BillingClientFeature {
   // WARNING: Changes to this class need to be reflected in our generated code.
   // Run `flutter packages pub run build_runner watch` to rebuild and watch for
@@ -504,3 +571,24 @@ enum BillingClientFeature {
   @JsonValue('subscriptionsUpdate')
   subscriptionsUpdate
 }
+
+/// Serializer for [BillingClientFeature].
+///
+/// Use these in `@JsonSerializable()` classes by annotating them with
+/// `@BillingClientFeatureConverter()`.
+class BillingClientFeatureConverter
+    implements JsonConverter<BillingClientFeature, String> {
+  /// Default const constructor.
+  const BillingClientFeatureConverter();
+
+  @override
+  BillingClientFeature fromJson(String json) {
+    return $enumDecode<BillingClientFeature, dynamic>(
+        _$BillingClientFeatureEnumMap.cast<BillingClientFeature, dynamic>(),
+        json);
+  }
+
+  @override
+  String toJson(BillingClientFeature object) =>
+      _$BillingClientFeatureEnumMap[object]!;
+}