diff --git a/animations/step_01/analysis_options.yaml b/animations/step_01/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_01/analysis_options.yaml
+++ b/animations/step_01/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_02_a/analysis_options.yaml b/animations/step_02_a/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_02_a/analysis_options.yaml
+++ b/animations/step_02_a/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_02_b/analysis_options.yaml b/animations/step_02_b/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_02_b/analysis_options.yaml
+++ b/animations/step_02_b/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_02_c/analysis_options.yaml b/animations/step_02_c/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_02_c/analysis_options.yaml
+++ b/animations/step_02_c/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_02_d/analysis_options.yaml b/animations/step_02_d/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_02_d/analysis_options.yaml
+++ b/animations/step_02_d/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_02_e/analysis_options.yaml b/animations/step_02_e/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_02_e/analysis_options.yaml
+++ b/animations/step_02_e/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_03_a/analysis_options.yaml b/animations/step_03_a/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_03_a/analysis_options.yaml
+++ b/animations/step_03_a/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_03_b/analysis_options.yaml b/animations/step_03_b/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_03_b/analysis_options.yaml
+++ b/animations/step_03_b/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_03_c/analysis_options.yaml b/animations/step_03_c/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_03_c/analysis_options.yaml
+++ b/animations/step_03_c/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_03_d/analysis_options.yaml b/animations/step_03_d/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_03_d/analysis_options.yaml
+++ b/animations/step_03_d/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_04_a/analysis_options.yaml b/animations/step_04_a/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_04_a/analysis_options.yaml
+++ b/animations/step_04_a/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_04_b/analysis_options.yaml b/animations/step_04_b/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_04_b/analysis_options.yaml
+++ b/animations/step_04_b/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_04_c/analysis_options.yaml b/animations/step_04_c/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_04_c/analysis_options.yaml
+++ b/animations/step_04_c/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_04_d/analysis_options.yaml b/animations/step_04_d/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_04_d/analysis_options.yaml
+++ b/animations/step_04_d/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_05_a/analysis_options.yaml b/animations/step_05_a/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_05_a/analysis_options.yaml
+++ b/animations/step_05_a/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_05_b/analysis_options.yaml b/animations/step_05_b/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_05_b/analysis_options.yaml
+++ b/animations/step_05_b/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_05_c/analysis_options.yaml b/animations/step_05_c/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_05_c/analysis_options.yaml
+++ b/animations/step_05_c/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/animations/step_05_d/analysis_options.yaml b/animations/step_05_d/analysis_options.yaml
index b1a042d01e..d2ad3868fe 100644
--- a/animations/step_05_d/analysis_options.yaml
+++ b/animations/step_05_d/analysis_options.yaml
@@ -3,6 +3,14 @@ include: ../../analysis_options.yaml
 analyzer:
   errors:
     unused_field: ignore
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   rules:
diff --git a/google-maps-in-flutter/step_3/test/widget_test.dart b/google-maps-in-flutter/step_3/test/widget_test.dart
index ea8821c024..0d0630e041 100644
--- a/google-maps-in-flutter/step_3/test/widget_test.dart
+++ b/google-maps-in-flutter/step_3/test/widget_test.dart
@@ -21,8 +21,8 @@
 // gestures. You can also use WidgetTester to find child widgets in the widget
 // tree, read text, and verify that the values of widget properties are correct.
 
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:material_ui/material_ui.dart';
 
 import 'package:google_maps_in_flutter/main.dart';
 
diff --git a/in_app_purchases/step_11/dart-backend/pubspec.lock b/in_app_purchases/step_11/dart-backend/pubspec.lock
index 797a21b3ab..38668d5ec9 100644
--- a/in_app_purchases/step_11/dart-backend/pubspec.lock
+++ b/in_app_purchases/step_11/dart-backend/pubspec.lock
@@ -357,10 +357,10 @@ packages:
     dependency: "direct main"
     description:
       name: shelf
-      sha256: e7dd780a7ffb623c57850b33f43309312fc863fb6aa3d276a754bb299839ef12
+      sha256: e75e9cf311d7fd712048038cc17c25199c38536c20330d53e7db058b543d5a48
       url: "https://pub.dev"
     source: hosted
-    version: "1.4.2"
+    version: "1.4.3"
   shelf_packages_handler:
     dependency: transitive
     description: