Enable pkg:lints recommended lints (dart-lang#1444)

Author: kevmoo

analysis_options.yaml

@@ -40,6 +40,7 @@ linter:
     - empty_catches
     - empty_constructor_bodies
     - empty_statements
+    - exhaustive_cases
     - file_names
     - hash_and_equals
     - implementation_imports
@@ -66,18 +67,23 @@ linter:
     - prefer_equal_for_default_values
     - prefer_final_fields
     - prefer_for_elements_to_map_fromIterable
+    - prefer_function_declarations_over_variables
     - prefer_generic_function_type_aliases
     - prefer_if_null_operators
     - prefer_initializing_formals
+    - prefer_inlined_adds
     - prefer_interpolation_to_compose_strings
     - prefer_is_empty
     - prefer_is_not_empty
+    - prefer_is_not_operator
     - prefer_iterable_whereType
     - prefer_null_aware_operators
     - prefer_relative_imports
     - prefer_single_quotes
     - prefer_spread_collections
     - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
     - recursive_getters
     - slash_for_doc_comments
     - test_types_in_equals
@@ -91,8 +97,11 @@ linter:
     - unnecessary_new
     - unnecessary_null_aware_assignments
     - unnecessary_null_in_if_null_operators
+    - unnecessary_overrides
     - unnecessary_parenthesis
     - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
     - unnecessary_this
     - unrelated_type_equality_checks
     - use_function_type_syntax_for_parameters

dwds/lib/src/debugging/debugger.dart

@@ -181,7 +181,7 @@ class Debugger extends Domain {
     return debugger;
   }
 
-  Future<Null> _initialize() async {
+  Future<void> _initialize() async {
     // We must add a listener before enabling the debugger otherwise we will
     // miss events.
     // Allow a null debugger/connection for unit tests.

dwds/lib/src/debugging/inspector.dart

@@ -140,7 +140,7 @@ class AppInspector extends Domain {
         isolateFlags: [])
       ..extensionRPCs = [];
     AppInspector appInspector;
-    var provider = () => appInspector;
+    AppInspector provider() => appInspector;
     var libraryHelper = LibraryHelper(provider);
     var classHelper = ClassHelper(provider);
     var instanceHelper = InstanceHelper(provider);

dwds/lib/src/handlers/injector.dart

@@ -82,7 +82,7 @@ class DwdsInjector {
               var requestedUri = request.requestedUri;
               var appId = base64
                   .encode(md5.convert(utf8.encode('$requestedUri')).bytes);
-              var scheme = '${request.requestedUri.scheme}';
+              var scheme = request.requestedUri.scheme;
               if (!_useSseForInjectedClient) {
                 // Switch http->ws and https->wss.
                 scheme = scheme.replaceFirst('http', 'ws');

dwds/lib/src/services/debug_service.dart

@@ -154,7 +154,7 @@ class DebugService {
         scheme: 'http',
         host: hostname,
         port: port,
-        path: '$authToken',
+        path: authToken,
       ),
       serviceUri: Uri(
         scheme: 'http',
@@ -180,7 +180,7 @@ class DebugService {
                 scheme: 'ws',
                 host: hostname,
                 port: port,
-                path: '$authToken',
+                path: authToken,
               ))
         .toString();
   }

dwds/lib/src/utilities/conversions.dart

@@ -5,7 +5,6 @@
 // @dart = 2.9
 
 /// Functions for converting between the different object references we use.
-
 import 'package:webkit_inspection_protocol/webkit_inspection_protocol.dart';
 
 /// Convert [argument] to a form usable in WIP evaluation calls.
@@ -81,7 +80,7 @@ RemoteObject remoteObjectFor(String dartId) {
 /// RemoteObjects.
 String dartIdFor(Object argument) {
   if (argument == null) {
-    return '$_nullId';
+    return _nullId;
   }
   if (argument is double) {
     return '$_prefixForDoubleIds$argument';

dwds/lib/src/utilities/dart_uri.dart

@@ -78,8 +78,7 @@ class DartUri {
       // Both currentDirectoryUri and the libraryUri path should have '/'
       // separators, so we can join them as url paths to get the absolute file
       // url.
-      var libraryPath =
-          p.url.join('$currentDirectoryUri', uri.path.substring(1));
+      var libraryPath = p.url.join(currentDirectoryUri, uri.path.substring(1));
       _libraryNamesByPath[libraryPath] = libraryUri;
     } else if (uri.scheme == 'package') {
       var libraryPath = _packageConfig.resolve(uri);

dwds/test/events_test.dart

@@ -41,10 +41,10 @@ void main() {
     });
 
     test('emits HTTP_REQUEST_EXCEPTION event', () async {
-      final throwAsyncException = () async {
+      Future<void> throwAsyncException() async {
         await Future.delayed(const Duration(milliseconds: 100));
         throw Exception('async error');
-      };
+      }
 
       // The events stream is a broadcast stream so start listening
       // before the action.

dwds/test/expression_compiler_service_test.dart

@@ -59,7 +59,7 @@ void main() async {
       var port = server.port;
 
       // start expression compilation service
-      final assetHandler = (request) =>
+      Response assetHandler(request) =>
           Response(200, body: File.fromUri(kernel).readAsBytesSync());
       service =
           ExpressionCompilerService('localhost', port, assetHandler, false);

dwds/test/fixtures/context.dart

@@ -343,7 +343,7 @@ class TestContext {
     webkitDebugger = WebkitDebugger(WipDebugger(tabConnection));
   }
 
-  Future<Null> tearDown() async {
+  Future<void> tearDown() async {
     await webDriver?.quit(closeSession: true);
     chromeDriver?.kill();
     DartUri.currentDirectory = p.current;