chore: added proper lints and fixed some warnings

- reapplied plugin template

.metadata

@@ -1,10 +1,30 @@
 # This file tracks properties of this Flutter project.
 # Used by Flutter tool to assess capabilities and perform upgrades etc.
 #
-# This file should be version controlled and should not be manually edited.
+# This file should be version controlled.
 
 version:
-  revision: adc687823a831bbebe28bdccfac1a628ca621513
+  revision: f1875d570e39de09040c8f79aa13cc56baab8db1
   channel: stable
 
 project_type: plugin
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: f1875d570e39de09040c8f79aa13cc56baab8db1
+      base_revision: f1875d570e39de09040c8f79aa13cc56baab8db1
+    - platform: android
+      create_revision: f1875d570e39de09040c8f79aa13cc56baab8db1
+      base_revision: f1875d570e39de09040c8f79aa13cc56baab8db1
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

analysis_options.yaml

@@ -0,0 +1,15 @@
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  rules:
+    # doc-style related: https://dart.dev/guides/language/effective-dart/documentation
+    - package_api_docs
+    - public_member_api_docs
+    - comment_references
+    - slash_for_doc_comments
+    # pub related: https://dart.dev/tools/linter-rules#pub-rules
+    - depend_on_referenced_packages
+    - secure_pubspec_urls
+    # import related
+    - always_use_package_imports
+    - implementation_imports

example/lib/main.dart

@@ -4,12 +4,14 @@ import 'package:flutter/material.dart' hide Intent;
 import 'package:receive_intent/receive_intent.dart';
 
 void main() {
-  runApp(MyApp());
+  runApp(const MyApp());
 }
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> {

example/pubspec.yaml

@@ -27,6 +27,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_lints: ^2.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec

example/test/widget_test.dart

@@ -7,19 +7,18 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-
 import 'package:receive_intent_example/main.dart';
 
 void main() {
   testWidgets('Verify Platform version', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(MyApp());
+    await tester.pumpWidget(const MyApp());
 
     // Verify that platform version is retrieved.
     expect(
       find.byWidgetPredicate(
-        (Widget widget) => widget is Text &&
-                           widget.data.startsWith('Running on:'),
+        (Widget widget) =>
+            widget is Text && widget.data.startsWith('Running on:'),
       ),
       findsOneWidget,
     );

lib/receive_intent.dart

@@ -64,10 +64,9 @@ class Intent {
 }
 
 class ReceiveIntent {
-  static const MethodChannel _methodChannel =
-      const MethodChannel('receive_intent');
+  static const MethodChannel _methodChannel = MethodChannel('receive_intent');
   static const EventChannel _eventChannel =
-      const EventChannel("receive_intent/event");
+      EventChannel("receive_intent/event");
 
   static Future<Intent?> getInitialIntent() async {
     final renameMap = await _methodChannel.invokeMapMethod('getInitialIntent');
@@ -80,7 +79,7 @@ class ReceiveIntent {
       .map<Intent?>((event) => Intent.fromMap(event as Map?));
 
   static Future<void> setResult(int resultCode,
-      {Map<String, Object?>? data, bool shouldFinish: false}) async {
+      {Map<String, Object?>? data, bool shouldFinish = false}) async {
     await _methodChannel.invokeMethod('setResult', <String, dynamic>{
       "resultCode": resultCode,
       if (data != null) "data": json.encode(data),

pubspec.yaml

@@ -14,6 +14,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_lints: ^2.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec