Added private constructors, and small arg tweaks

lib/src/commands/install_command.dart

@@ -34,7 +34,7 @@ class InstallCommand extends BaseCommand {
   @override
   Future<int> run() async {
     CacheVersion cacheVersion;
-    final skipSetup = argResults['skip-setup'] == true;
+    final skipSetup = boolArg('skip-setup');
     String version;
 
     // If no version was passed as argument check project config.

lib/src/runner.dart

@@ -17,7 +17,6 @@ import 'commands/spawn_command.dart';
 import 'commands/use_command.dart';
 import 'commands/which_command.dart';
 import 'utils/logger.dart';
-import 'utils/logger.dart' show logger;
 import 'utils/pubdev.dart';
 import 'version.dart';
 

lib/src/services/cache_service.dart

@@ -10,9 +10,10 @@ import 'context.dart';
 import 'flutter_tools.dart';
 import 'git_tools.dart';
 
-// ignore: avoid_classes_with_only_static_members
 /// Service to interact with FVM Cache
 class CacheService {
+  CacheService._();
+
   /// Directory where local versions are cached
 
   /// Returns a [CacheVersion] from a [versionName]

lib/src/services/config_service.dart

@@ -8,6 +8,8 @@ import '../utils/helpers.dart';
 
 /// Helpers and tools for the FVM config within a project
 class ConfigService {
+  ConfigService._();
+
   /// Returns a [FvmConfig] from within a [directory]
   static Future<FvmConfig> read(Directory directory) async {
     final configDir = Directory(join(directory.path, kFvmDirName));

lib/src/services/flutter_tools.dart

@@ -11,6 +11,8 @@ import 'releases_service/releases_client.dart';
 
 /// Helpers and tools to interact with Flutter sdk
 class FlutterTools {
+  FlutterTools._();
+
   /// Upgrades a cached channel
   static Future<void> upgradeChannel(CacheVersion version) async {
     if (version.isChannel) {

lib/src/services/git_tools.dart

@@ -10,9 +10,10 @@ import '../utils/logger.dart';
 import 'context.dart';
 import 'settings_service.dart';
 
-// ignore: avoid_classes_with_only_static_members
 /// Tools  and helpers used for interacting with git
 class GitTools {
+  GitTools._();
+
   /// Check if Git is installed
   static Future<void> canRun() async {
     try {

lib/src/services/project_service.dart

@@ -11,6 +11,8 @@ import 'config_service.dart';
 /// Flutter Project Services
 /// APIs for interacting with local Flutter projects
 class ProjectService {
+  ProjectService._();
+
   /// Returns projects by providing a [directory]
   static Future<Project> getByDirectory(Directory directory) async {
     final pubspec = await _getPubspec(directory);

lib/src/services/settings_service.dart

@@ -1,9 +1,9 @@
 import '../../fvm.dart';
 import 'context.dart';
 
-// ignore: avoid_classes_with_only_static_members
 /// Service for FVM settings
 class SettingsService {
+  SettingsService._();
   static FvmSettings _settings;
 
   /// Returns [FvmSettings]

pubspec.yaml

@@ -1,5 +1,6 @@
 name: fvm
-description: A simple cli to manage Flutter SDK versions per project. Support channels, releases, and local cache for fast switching between versions.
+description: A simple cli to manage Flutter SDK versions per project. Support
+  channels, releases, and local cache for fast switching between versions.
 version: 2.0.0-dev.4
 homepage: https://github.com/leoafarias/fvm
 
@@ -10,28 +11,25 @@ executables:
   fvm: main
 
 dependencies:
-  meta: ^1.3.0
-  pubspec_yaml: ^2.0.1+1
   args: ^1.6.0
   cli_util: ^0.3.0
   console: ^3.1.0
+  date_format: ^2.0.2
+  http: ^0.12.2
   io: ^0.3.4
+  meta: ^1.3.0
   path: ^1.7.0
   process_run: ^0.11.2+8
-  http: ^0.12.2
-  date_format: ^2.0.2
-  version: ^2.0.0
   pub_api_client: ^1.0.9
-
+  pubspec_yaml: ^2.0.1+1
+  version: ^2.0.0
+
 dev_dependencies:
-  effective_dart: ^1.3.1
-  test: ^1.15.7
-  test_coverage: ^0.5.0
   build_runner: ^1.10.0
-  build_version: ^2.0.2
   build_test: ^1.2.2
-  grinder: ^0.8.6
+  build_version: ^2.0.2
   cli_pkg: ^1.2.0
-
-
-
+  effective_dart: ^1.3.1
+  grinder: ^0.8.6
+  test: ^1.15.7
+  test_coverage: ^0.5.0