Filter out internal type properties from the new DDC type system (#2348)

Author: elliette

dwds/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 23.3.0-wip
 
+- Filter out internal type properties from the new DDC type system. - [#2348](https://github.com/dart-lang/webdev/pull/2348)
+
 ## 23.2.0
 
 - Send untruncated `dart:developer` logs to debugging clients. - [#2333](https://github.com/dart-lang/webdev/pull/2333)

dwds/lib/src/debugging/dart_scope.dart

@@ -20,11 +20,11 @@ final ddcTemporaryTypeVariableRegExp = RegExp(r'^__t[\$\w*]+$');
 final previousDdcTemporaryVariableRegExp =
     RegExp(r'^(t[0-9]+\$?[0-9]*|__t[\$\w*]+)$');
 
-/// Find the visible Dart properties from a JS Scope Chain, coming from the
+/// Find the visible Dart variables from a JS Scope Chain, coming from the
 /// scopeChain attribute of a Chrome CallFrame corresponding to [frame].
 ///
 /// See chromedevtools.github.io/devtools-protocol/tot/Debugger#type-CallFrame.
-Future<List<Property>> visibleProperties({
+Future<List<Property>> visibleVariables({
   required AppInspectorInterface inspector,
   required WipCallFrame frame,
 }) async {

dwds/lib/src/debugging/debugger.dart

@@ -405,7 +405,7 @@ class Debugger extends Domain {
   Future<List<BoundVariable>> variablesFor(WipCallFrame frame) async {
     // TODO(alanknight): Can these be moved to dart_scope.dart?
     final properties =
-        await visibleProperties(inspector: inspector, frame: frame);
+        await visibleVariables(inspector: inspector, frame: frame);
     final boundVariables = await Future.wait(
       properties.map(_boundVariable),
     );

dwds/lib/src/debugging/inspector.dart

@@ -601,9 +601,18 @@ class AppInspector implements AppInspectorInterface {
     );
     return jsProperties
         .map<Property>((each) => Property(each as Map<String, dynamic>))
+        .where(_isVisibleProperty)
         .toList();
   }
 
+  bool _isVisibleProperty(Property property) {
+    // Filter out any RTI objects from the new DDC type system. See:
+    // https://github.com/dart-lang/webdev/issues/2316
+    final isRtiObject =
+        property.value?.className?.startsWith('dart_rti.Rti') ?? false;
+    return !isRtiObject;
+  }
+
   /// Calculate the number of available elements in the range.
   static int _calculateRangeCount({
     int? count,

dwds/test/inspector_test.dart

@@ -11,7 +11,6 @@ import 'package:dwds/src/debugging/inspector.dart';
 import 'package:dwds/src/utilities/conversions.dart';
 import 'package:test/test.dart';
 import 'package:test_common/test_sdk_configuration.dart';
-import 'package:test_common/utilities.dart';
 import 'package:vm_service/vm_service.dart';
 import 'package:webkit_inspection_protocol/webkit_inspection_protocol.dart';
 
@@ -161,10 +160,6 @@ void main() {
     final names =
         properties.map((p) => p.name).where((x) => x != '__proto__').toList();
     final expected = [
-      if (dartSdkIsAtLeast(
-        newDdcTypeSystemVersion,
-      ))
-        '\$ti',
       '_privateField',
       'abstractField',
       'closure',

dwds/test/variable_scope_test.dart

@@ -9,7 +9,6 @@ import 'package:dwds/src/services/chrome_proxy_service.dart';
 import 'package:test/test.dart';
 import 'package:test_common/logging.dart';
 import 'package:test_common/test_sdk_configuration.dart';
-import 'package:test_common/utilities.dart';
 import 'package:vm_service/vm_service.dart';
 
 import 'fixtures/context.dart';
@@ -208,12 +207,6 @@ void main() {
       expect(
         variableNames,
         [
-          // TODO(https://github.com/dart-lang/webdev/issues/2316): Make sure T
-          // doesn't show up here.
-          if (dartSdkIsAtLeast(
-            newDdcTypeSystemVersion,
-          ))
-            'T',
           'closureLocalInsideMethod',
           'local',
           'parameter',
@@ -229,12 +222,6 @@ void main() {
 
       final variableNames = variables.keys.toList()..sort();
       expect(variableNames, [
-        // TODO(https://github.com/dart-lang/webdev/issues/2316): Make sure T
-        // doesn't show up here.
-        if (dartSdkIsAtLeast(
-          newDdcTypeSystemVersion,
-        ))
-          'T',
         'this',
       ]);
     });

fixtures/_test/example/scopes/main.dart

@@ -93,6 +93,7 @@ class MyTestClass<T> extends MyAbstractClass {
   String hello() => message;
 
   String Function(String) methodWithVariables() {
+    print('Test class is of type $T');
     var local = '$message + something';
     print(local);
     return (String parameter) {