[in_app_purchase] Fix most failing pedantic lints (#2317)

None of these fixes should affect functionality. There are dozens of
undocumented public API members that still need to be documented to
completely remove the analysis_options for this package.

Author: Michael Klimushyn

packages/in_app_purchase/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.2.2+3
+
+* Fix failing pedantic lints. None of these fixes should have any change in
+  functionality.
+
 ## 0.2.2+2
 
 * Include lifecycle dependency as a compileOnly one on Android to resolve

packages/in_app_purchase/analysis_options.yaml

@@ -7,10 +7,4 @@ include: ../../analysis_options.yaml
 
 analyzer:
   errors:
-    avoid_init_to_null: ignore
-    prefer_is_empty: ignore
-    prefer_is_not_empty: ignore
     public_member_api_docs: ignore
-    type_init_formals: ignore
-    unnecessary_new: ignore
-    unawaited_futures: ignore

packages/in_app_purchase/example/lib/main.dart

@@ -36,7 +36,7 @@ class _MyAppState extends State<MyApp> {
   bool _isAvailable = false;
   bool _purchasePending = false;
   bool _loading = true;
-  String _queryProductError = null;
+  String _queryProductError;
 
   @override
   void initState() {
@@ -149,12 +149,12 @@ class _MyAppState extends State<MyApp> {
       stack.add(
         Stack(
           children: [
-            new Opacity(
+            Opacity(
               opacity: 0.3,
               child: const ModalBarrier(dismissible: false, color: Colors.grey),
             ),
-            new Center(
-              child: new CircularProgressIndicator(),
+            Center(
+              child: CircularProgressIndicator(),
             ),
           ],
         ),
@@ -213,7 +213,7 @@ class _MyAppState extends State<MyApp> {
         title: Text('Products for Sale',
             style: Theme.of(context).textTheme.headline));
     List<ListTile> productList = <ListTile>[];
-    if (!_notFoundIds.isEmpty) {
+    if (_notFoundIds.isNotEmpty) {
       productList.add(ListTile(
           title: Text('[${_notFoundIds.join(", ")}] not found',
               style: TextStyle(color: ThemeData.light().errorColor)),
@@ -375,10 +375,12 @@ class _MyAppState extends State<MyApp> {
           }
         }
         if (Platform.isIOS) {
-          InAppPurchaseConnection.instance.completePurchase(purchaseDetails);
+          await InAppPurchaseConnection.instance
+              .completePurchase(purchaseDetails);
         } else if (Platform.isAndroid) {
           if (!kAutoConsume && purchaseDetails.productID == _kConsumableId) {
-            InAppPurchaseConnection.instance.consumePurchase(purchaseDetails);
+            await InAppPurchaseConnection.instance
+                .consumePurchase(purchaseDetails);
           }
         }
       }

packages/in_app_purchase/example/test_driver/test/in_app_purchase_e2e_test.dart

@@ -10,6 +10,6 @@ Future<void> main() async {
   final FlutterDriver driver = await FlutterDriver.connect();
   final String result =
       await driver.requestData(null, timeout: const Duration(minutes: 1));
-  driver.close();
+  await driver.close();
   exit(result == 'pass' ? 0 : 1);
 }

packages/in_app_purchase/lib/src/billing_client_wrappers/purchase_wrapper.dart

@@ -101,8 +101,7 @@ class PurchaseWrapper {
 @BillingResponseConverter()
 class PurchasesResultWrapper {
   PurchasesResultWrapper(
-      {@required BillingResponse this.responseCode,
-      @required List<PurchaseWrapper> this.purchasesList});
+      {@required this.responseCode, @required this.purchasesList});
 
   factory PurchasesResultWrapper.fromJson(Map<String, dynamic> map) =>
       _$PurchasesResultWrapperFromJson(map);

packages/in_app_purchase/lib/src/in_app_purchase/app_store_connection.dart

@@ -154,7 +154,7 @@ class AppStoreConnection implements InAppPurchaseConnection {
           .toList();
     }
     List<String> invalidIdentifiers = response.invalidProductIdentifiers ?? [];
-    if (productDetails.length == 0) {
+    if (productDetails.isEmpty) {
       invalidIdentifiers = identifiers.toList();
     }
     ProductDetailsResponse productDetailsResponse = ProductDetailsResponse(

packages/in_app_purchase/lib/src/in_app_purchase/google_play_connection.dart

@@ -238,7 +238,7 @@ class GooglePlayConnection
         ..status = status
         ..error = error);
     }).toList();
-    if (!purchases.isEmpty) {
+    if (purchases.isNotEmpty) {
       return Future.wait(purchases);
     } else {
       return [

packages/in_app_purchase/lib/src/in_app_purchase/in_app_purchase_connection.dart

@@ -249,7 +249,7 @@ class IAPError {
       {@required this.source,
       @required this.code,
       @required this.message,
-      this.details = null});
+      this.details});
 
   /// Which source is the error on.
   final IAPSource source;

packages/in_app_purchase/lib/src/in_app_purchase/product_details.dart

@@ -17,8 +17,8 @@ class ProductDetails {
       @required this.title,
       @required this.description,
       @required this.price,
-      this.skProduct = null,
-      this.skuDetail = null});
+      this.skProduct,
+      this.skuDetail});
 
   /// The identifier of the product, specified in App Store Connect or Sku in Google Play console.
   final String id;
@@ -67,9 +67,7 @@ class ProductDetails {
 /// A list of [ProductDetails] can be obtained from the this response.
 class ProductDetailsResponse {
   ProductDetailsResponse(
-      {@required this.productDetails,
-      @required this.notFoundIDs,
-      this.error = null});
+      {@required this.productDetails, @required this.notFoundIDs, this.error});
 
   /// Each [ProductDetails] uniquely matches one valid identifier in [identifiers] of [InAppPurchaseConnection.queryProductDetails].
   final List<ProductDetails> productDetails;

packages/in_app_purchase/lib/src/in_app_purchase/purchase_details.dart

@@ -142,8 +142,8 @@ class PurchaseDetails {
     @required this.productID,
     @required this.verificationData,
     @required this.transactionDate,
-    this.skPaymentTransaction = null,
-    this.billingClientPurchase = null,
+    this.skPaymentTransaction,
+    this.billingClientPurchase,
   });
 
   /// Generate a [PurchaseDetails] object based on an iOS [SKTransactionWrapper] object.

packages/in_app_purchase/lib/src/store_kit_wrappers/sk_payment_queue_wrapper.dart

@@ -35,7 +35,7 @@ class SKPaymentQueueWrapper {
     return _singleton;
   }
 
-  static final SKPaymentQueueWrapper _singleton = new SKPaymentQueueWrapper._();
+  static final SKPaymentQueueWrapper _singleton = SKPaymentQueueWrapper._();
 
   SKPaymentQueueWrapper._() {
     callbackChannel.setMethodCallHandler(_handleObserverCallbacks);

packages/in_app_purchase/pubspec.yaml

@@ -2,7 +2,7 @@ name: in_app_purchase
 description: A Flutter plugin for in-app purchases. Exposes APIs for making in-app purchases through the App Store and Google Play.
 author:  Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/in_app_purchase
-version: 0.2.2+2
+version: 0.2.2+3
 
 
 dependencies: