Configure linter

analysis_options.yaml

@@ -13,15 +13,27 @@
 
 include: package:lints/recommended.yaml
 
-# Uncomment the following section to specify additional rules.
+analyzer:
+  strong-mode:
+    implicit-casts: false
+  exclude: [build/**]
+  language:
+    strict-casts: true
+    strict-inference: true
+    strict-raw-types: true
+  errors:
+    todo: ignore
+    missing_return: error
+    dead_code: info
 
-# linter:
-#   rules:
-#     - camel_case_types
-
-# analyzer:
-#   exclude:
-#     - path/to/excluded/files/**
+linter:
+  rules:
+    - camel_case_types
+    - always_declare_return_types
+    - comment_references
+    - await_only_futures
+    - avoid_slow_async_io
+    - discarded_futures
 
 # For more information about the core and recommended set of lints, see
 # https://dart.dev/go/core-lints

lib/dart_isolates/echo_isolates_example.dart

@@ -13,7 +13,7 @@ Future<String> echoIsolate(String message) async {
   sendPort.send([message, answer.sendPort]);
 
   // Wait for the response.
-  final response = await answer.first;
+  final response = await answer.first as Future<String>;
 
   return response;
 }
@@ -26,7 +26,7 @@ Future<SendPort> createIsolate() async {
   await Isolate.spawn(echo, receivePort.sendPort);
 
   // The 'echo' isolate sends its SendPort as the first message.
-  final sendPort = await receivePort.first;
+  final sendPort = await receivePort.first as Future<SendPort>;
 
   return sendPort;
 }
@@ -41,8 +41,8 @@ void echo(SendPort sendPort) {
 
   port.listen((message) {
     // Parse the message.
-    final String data = message[0];
-    final SendPort replyTo = message[1];
+    final String data = message[0] as String;
+    final SendPort replyTo = message[1] as SendPort;
 
     // Send a message back.
     replyTo.send('Echo: $data');

lib/dart_isolates/parallel_data_processing/large_list_of_numbers.dart

@@ -50,11 +50,12 @@ Future<List<int>> calculateSquaresParallel(List<int> data) async {
   return squares;
 }
 
-/// The function executed by each isolate to calculate the squares of the numbers in the given [chunk].
-/// The calculated squares are sent back to the main isolate using the [sendPort].
+/// Function to be executed in an isolate.
+/// It receives a message containing a chunk of data and a send port.
+/// It squares each number in the chunk and sends the squared chunk back through the send port.
 void isolateFunction(Map<String, dynamic> message) {
-  final List<int> chunk = message['data'];
-  final SendPort sendPort = message['sendPort'];
+  final List<int> chunk = message['data'] as List<int>;
+  final SendPort sendPort = message['sendPort'] as SendPort;
   final List<int> squaredChunk =
       chunk.map((number) => number * number).toList();
   sendPort.send(squaredChunk);

pubspec.yaml

@@ -1,5 +1,5 @@
 name: dart_concurrency
-description: A sample command-line application.
+description: A is a sample command-line application that demonstrates the use of concurrency in Dart.
 version: 1.0.0
 # repository: https://github.com/my_org/my_repo