build: replace null safety dart style package (#110)

Author: lcdsmao

example/pubspec.lock

@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.6.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -222,14 +222,14 @@ packages:
       name: flutter_gen_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.0"
+    version: "3.1.1"
   flutter_gen_runner:
     dependency: "direct dev"
     description:
       path: "../packages/runner"
       relative: true
     source: path
-    version: "3.1.0"
+    version: "3.1.1"
   flutter_svg:
     dependency: "direct main"
     description:
@@ -407,7 +407,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.1"
   stack_trace:
     dependency: transitive
     description:
@@ -449,7 +449,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.3.0"
   time:
     dependency: transitive
     description:

packages/command/pubspec.lock

@@ -78,6 +78,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.0"
+  dart_style:
+    dependency: transitive
+    description:
+      name: dart_style
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   dartx:
     dependency: transitive
     description:

packages/core/lib/flutter_generator.dart

@@ -1,12 +1,12 @@
 import 'dart:io';
 
+import 'package:dart_style/dart_style.dart';
 import 'package:path/path.dart';
 
 import 'generators/assets_generator.dart';
 import 'generators/colors_generator.dart';
 import 'generators/fonts_generator.dart';
 import 'settings/config.dart';
-import 'utils/dart_style/dart_style.dart';
 import 'utils/error.dart';
 import 'utils/file.dart';
 

packages/core/lib/generators/assets_generator.dart

@@ -2,13 +2,13 @@ import 'dart:collection';
 import 'dart:io';
 
 import 'package:collection/collection.dart';
+import 'package:dart_style/dart_style.dart';
 import 'package:dartx/dartx.dart';
 import 'package:path/path.dart';
 
 import '../settings/asset_type.dart';
 import '../settings/config.dart';
 import '../settings/pubspec.dart';
-import '../utils/dart_style/dart_style.dart';
 import '../utils/error.dart';
 import '../utils/string.dart';
 import 'generator_helper.dart';

packages/core/lib/generators/colors_generator.dart

@@ -1,13 +1,13 @@
 import 'dart:io';
 
+import 'package:dart_style/dart_style.dart';
 import 'package:dartx/dartx.dart';
 import 'package:path/path.dart';
 import 'package:xml/xml.dart';
 
 import '../settings/color_path.dart';
 import '../settings/pubspec.dart';
 import '../utils/color.dart';
-import '../utils/dart_style/dart_style.dart';
 import '../utils/error.dart';
 import '../utils/string.dart';
 import 'generator_helper.dart';

packages/core/lib/generators/fonts_generator.dart

@@ -1,7 +1,7 @@
+import 'package:dart_style/dart_style.dart';
 import 'package:dartx/dartx.dart';
 
 import '../settings/pubspec.dart';
-import '../utils/dart_style/dart_style.dart';
 import '../utils/error.dart';
 import '../utils/string.dart';
 import 'generator_helper.dart';