feat(platform_helper): created a platform helper package to detect web vs mobile

packages/platform_helper/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# VSCode related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json

packages/platform_helper/README.md

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+# platform_helper
+
+[![style: very good analysis][very_good_analysis_badge]][very_good_analysis_link]
+[![License: MIT][license_badge]][license_link]
+
+A Very Good Project created by Very Good CLI.
+
+[license_badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[license_link]: https://opensource.org/licenses/MIT
+[very_good_analysis_badge]: https://img.shields.io/badge/style-very_good_analysis-B22C89.svg
+[very_good_analysis_link]: https://pub.dev/packages/very_good_analysis

packages/platform_helper/analysis_options.yaml

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+include: package:very_good_analysis/analysis_options.2.4.0.yaml

packages/platform_helper/lib/platform_helper.dart

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+library platform_helper;
+
+export 'src/platform_helper.dart';

packages/platform_helper/lib/src/platform_helper.dart

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+import 'package:flutter/foundation.dart';
+
+/// {@template platform_helper}
+/// Returns whether the current platform is running on a mobile device.
+/// {@endtemplate}
+class PlatformHelper {
+  /// {@macro platform_helper}
+  bool get isMobile {
+    return defaultTargetPlatform == TargetPlatform.iOS ||
+        defaultTargetPlatform == TargetPlatform.android;
+  }
+}

packages/platform_helper/pubspec.yaml

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+name: platform_helper
+description: A Very Good Project created by Very Good CLI.
+version: 1.0.0+1
+publish_to: none
+
+environment:
+  sdk: ">=2.16.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  very_good_analysis: ^2.4.0

packages/platform_helper/test/src/platform_helper_test.dart

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+// ignore_for_file: prefer_const_constructors
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:platform_helper/platform_helper.dart';
+
+void main() {
+  group('PlatformHelper', () {
+    test('can be instantiated', () {
+      expect(PlatformHelper(), isNotNull);
+    });
+
+    group('isMobile', () {
+      tearDown(() async {
+        debugDefaultTargetPlatformOverride = null;
+      });
+
+      test('returns true when defaultTargetPlatform is iOS', () async {
+        debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+        expect(PlatformHelper().isMobile, isTrue);
+        debugDefaultTargetPlatformOverride = null;
+      });
+
+      test('returns true when defaultTargetPlatform is android', () async {
+        debugDefaultTargetPlatformOverride = TargetPlatform.android;
+        expect(PlatformHelper().isMobile, isTrue);
+        debugDefaultTargetPlatformOverride = null;
+      });
+
+      test(
+        'returns false when defaultTargetPlatform is niether iOS nor android',
+        () async {
+          debugDefaultTargetPlatformOverride = TargetPlatform.macOS;
+          expect(PlatformHelper().isMobile, isFalse);
+          debugDefaultTargetPlatformOverride = null;
+        },
+      );
+    });
+  });
+}