fix(dataclass): Update frozen_dataclass implementation for type safety

why: Ensure custom frozen_dataclass is fully type-checker compatible

what:

- Added type ignore directives for method assignment in frozen_dataclass

- Added global mypy directive to silence inheritance errors in tests

- Fixed variable naming for exception handling in tests

- Ensured tests properly handle both AttributeError and NotImplementedError

refs: Completes full type checking compatibility for frozen dataclasses

Author: tony

src/libtmux/_internal/frozen_dataclass.py

@@ -69,8 +69,9 @@ def __delattr__(self: t.Any, name: str) -> None:
         object.__delattr__(self, name)
 
     # F. Inject into the class
-    cls.__init__ = __init__
-    cls.__setattr__ = __setattr__
-    cls.__delattr__ = __delattr__
+    # Add type ignore directives to silence mypy "Cannot assign to a method" errors
+    cls.__init__ = __init__  # type: ignore[method-assign]
+    cls.__setattr__ = __setattr__  # type: ignore[method-assign]
+    cls.__delattr__ = __delattr__  # type: ignore[method-assign]
 
     return cls

tests/_internal/test_frozen_dataclass.py

@@ -25,6 +25,10 @@ def resize(self, width: int, height: int) -> None:
         self.height = height
 
 
+# Silence specific mypy errors with a global disable
+# mypy: disable-error-code="misc"
+
+
 # 2. Subclass the mutable BasePane, but freeze it with our custom decorator
 @frozen_dataclass
 class PaneSnapshot(BasePane):
@@ -93,7 +97,7 @@ def test_immutability() -> None:
 
     # Attempting to modify a field should raise AttributeError
     with pytest.raises(AttributeError) as excinfo:
-        snapshot.width = 200
+        snapshot.width = 200  # type: ignore
     assert "immutable" in str(excinfo.value)
 
     # Attempting to add a new field should raise AttributeError
@@ -107,9 +111,10 @@ def test_immutability() -> None:
     assert "immutable" in str(excinfo.value)
 
     # Calling a method that tries to modify state should fail
-    with pytest.raises(NotImplementedError) as excinfo:
+    # Use separate variable for the NotImplementedError exception info
+    with pytest.raises(NotImplementedError) as resize_excinfo:
         snapshot.resize(200, 50)
-    assert "immutable" in str(excinfo.value)
+    assert "immutable" in str(resize_excinfo.value)
 
 
 def test_nested_references() -> None: