Substitute `dynamic` for type parameters when inferring types for JS(...)

pkg/analyzer/lib/src/generated/static_type_analyzer.dart

Index: pkg/analyzer/lib/src/generated/static_type_analyzer.dart
diff --git a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
index 4a2362f7558f8eee6c78c44139bf845d6d7ce445..8ec251bef4edfbcaca5b1e11583da322bd94de0d 100644
--- a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
+++ b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
@@ -1600,6 +1600,12 @@ class StaticTypeAnalyzer extends SimpleAstVisitor<Object> {
       }
       ClassElement returnType = library.getType(elementName);
       if (returnType != null) {
+        if (returnType.typeParameters.isNotEmpty) {
+          // Caller can't deal with unbound type parameters, so substitute
+          // `dynamic`.
+          return returnType.type.substitute4(
+              returnType.typeParameters.map((_) => _dynamicType).toList());
+        }
         return returnType.type;
       }
     }