diff --git a/dwds/CHANGELOG.md b/dwds/CHANGELOG.md
index 674ec5c87..10530c9aa 100644
--- a/dwds/CHANGELOG.md
+++ b/dwds/CHANGELOG.md
@@ -1,6 +1,8 @@
 ## 14.0.1-dev
 - Add `libraryFilters` optional parameter to the vm service implememtation
   of `getSourceReport`.
+- Update temp variable detection heuristics so internal JS type objects do
+  not show in the debugger.
 
 ## 14.0.0
 - Add column information to breakpoints to allow precise breakpoint placement.
diff --git a/dwds/lib/src/debugging/dart_scope.dart b/dwds/lib/src/debugging/dart_scope.dart
index 0c6bc4de4..b27ed50d4 100644
--- a/dwds/lib/src/debugging/dart_scope.dart
+++ b/dwds/lib/src/debugging/dart_scope.dart
@@ -11,7 +11,7 @@ import 'debugger.dart';
 
 // TODO(sdk/issues/44262) - use an alternative way to identify synthetic
 // variables.
-final ddcTemporaryVariableRegExp = RegExp(r'^(t[0-9]+\$?[0-9]*|__t\$\w*)$');
+final ddcTemporaryVariableRegExp = RegExp(r'^(t[0-9]+\$?[0-9]*|__t[\$\w*]+)$');
 
 /// Find the visible Dart properties from a JS Scope Chain, coming from the
 /// scopeChain attribute of a Chrome CallFrame corresponding to [frame].
diff --git a/dwds/test/variable_scope_test.dart b/dwds/test/variable_scope_test.dart
index eb00efe88..390a68cdc 100644
--- a/dwds/test/variable_scope_test.dart
+++ b/dwds/test/variable_scope_test.dart
@@ -39,6 +39,8 @@ void main() {
       expect(ddcTemporaryVariableRegExp.hasMatch(r't10'), isTrue);
       expect(ddcTemporaryVariableRegExp.hasMatch(r'__t$TL'), isTrue);
       expect(ddcTemporaryVariableRegExp.hasMatch(r'__t$StringN'), isTrue);
+      expect(ddcTemporaryVariableRegExp.hasMatch(r'__t$IdentityMapOfString$T'),
+          isTrue);
 
       expect(ddcTemporaryVariableRegExp.hasMatch(r't'), isFalse);
       expect(ddcTemporaryVariableRegExp.hasMatch(r't10foo'), isFalse);