feat: add ReadOnly qualifier support for NewTypedDict

- Handle ReadOnly qualifier in addition to NotRequired
- Support multiple qualifiers (ReadOnly + NotRequired)
- Add tests for ReadOnly functionality

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: codewizdave

packages/typemap/src/typemap/type_eval/_eval_operators.py

@@ -1304,11 +1304,15 @@ def _eval_NewTypedDict(*etyps: Member, ctx):
         typ = _eval_types(typ, ctx)
         tquals = _eval_types(quals, ctx)
 
-        # Handle NotRequired qualifier for TypedDict
+        # Handle qualifiers for TypedDict fields
+        annotations = []
         if type_eval.issubtype(typing.Literal["NotRequired"], tquals):
-            # NotRequired means the field is optional
-            # In TypedDict, this is handled differently
-            annos[name] = typing.Annotated[typ, typing.NotRequired]
+            annotations.append(typing.NotRequired)
+        if type_eval.issubtype(typing.Literal["ReadOnly"], tquals):
+            annotations.append(typing.ReadOnly)
+
+        if annotations:
+            annos[name] = typing.Annotated[typ, *annotations]
         else:
             annos[name] = typ
 

packages/typemap/tests/test_type_eval.py

@@ -3306,6 +3306,34 @@ def test_newtypeddict_optional_field():
     assert hasattr(result.__annotations__["optional_field"], "__metadata__")
 
 
+def test_newtypeddict_readonly_field():
+    """Test NewTypedDict with ReadOnly qualifier marks field as read-only."""
+
+    result = eval_typing(
+        NewTypedDict[
+            Member[Literal["id"], int],
+            Member[Literal["name"], str, Literal["ReadOnly"]],
+        ]
+    )
+    assert result.__annotations__["id"] is int
+    # ReadOnly fields should be wrapped with Annotated
+    assert hasattr(result.__annotations__["name"], "__metadata__")
+
+
+def test_newtypeddict_multiple_qualifiers():
+    """Test NewTypedDict with both NotRequired and ReadOnly qualifiers."""
+
+    result = eval_typing(
+        NewTypedDict[
+            Member[Literal["id"], int, Literal["ReadOnly"]],
+            Member[Literal["optional_name"], str, Literal["NotRequired", "ReadOnly"]],
+        ]
+    )
+    # Both should have metadata
+    assert hasattr(result.__annotations__["id"], "__metadata__")
+    assert hasattr(result.__annotations__["optional_name"], "__metadata__")
+
+
 def test_newtypeddict_with_iter_attrs():
     """Test NewTypedDict using Iter and Attrs to create from existing class."""