diff --git a/packages/android_alarm_manager/lib/android_alarm_manager.dart b/packages/android_alarm_manager/lib/android_alarm_manager.dart
index b90823e..76994b9 100644
--- a/packages/android_alarm_manager/lib/android_alarm_manager.dart
+++ b/packages/android_alarm_manager/lib/android_alarm_manager.dart
@@ -39,8 +39,10 @@
       exit(-1);
     }
 
+    // ignore: inference_failure_on_function_return_type
     if (closure is Function()) {
       closure();
+      // ignore: inference_failure_on_function_return_type
     } else if (closure is Function(int)) {
       final int id = args[1];
       closure(id);
@@ -182,6 +184,7 @@
     bool wakeup = false,
     bool rescheduleOnReboot = false,
   }) async {
+    // ignore: inference_failure_on_function_return_type
     assert(callback is Function() || callback is Function(int));
     assert(id.bitLength < 32);
     final int startMillis = time.millisecondsSinceEpoch;
@@ -245,6 +248,7 @@
     bool wakeup = false,
     bool rescheduleOnReboot = false,
   }) async {
+    // ignore: inference_failure_on_function_return_type
     assert(callback is Function() || callback is Function(int));
     assert(id.bitLength < 32);
     final int now = DateTime.now().millisecondsSinceEpoch;
diff --git a/packages/camera/lib/camera.dart b/packages/camera/lib/camera.dart
index ee1892c..cc12b90 100644
--- a/packages/camera/lib/camera.dart
+++ b/packages/camera/lib/camera.dart
@@ -38,6 +38,7 @@
   max,
 }
 
+// ignore: inference_failure_on_function_return_type
 typedef onLatestImageAvailable = Function(CameraImage image);
 
 /// Returns the resolution preset as a String.
diff --git a/packages/in_app_purchase/lib/src/in_app_purchase/google_play_connection.dart b/packages/in_app_purchase/lib/src/in_app_purchase/google_play_connection.dart
index 32f8fc7..d64467e 100644
--- a/packages/in_app_purchase/lib/src/in_app_purchase/google_play_connection.dart
+++ b/packages/in_app_purchase/lib/src/in_app_purchase/google_play_connection.dart
@@ -186,8 +186,10 @@
     } on PlatformException catch (e) {
       exception = e;
       responses = [
+        // ignore: invalid_use_of_visible_for_testing_member
         SkuDetailsResponseWrapper(
             responseCode: BillingResponse.error, skuDetailsList: []),
+        // ignore: invalid_use_of_visible_for_testing_member
         SkuDetailsResponseWrapper(
             responseCode: BillingResponse.error, skuDetailsList: [])
       ];