error when var is given something not a str (#5164)

pyi_hashes.json

@@ -57,7 +57,7 @@
   "reflex/components/radix/primitives/slider.pyi": "10196fb967c9cde3860a930a526b6c51",
   "reflex/components/radix/themes/__init__.pyi": "a15f9464ad99f248249ffa8e6deea4cf",
   "reflex/components/radix/themes/base.pyi": "a3c3c3b72fd3d8f1e38990e5c461b682",
-  "reflex/components/radix/themes/color_mode.pyi": "435a51382eab6111aae1b26e79e9a473",
+  "reflex/components/radix/themes/color_mode.pyi": "e18fe42952d10f5733f3baf4789c4bb5",
   "reflex/components/radix/themes/components/__init__.pyi": "87bb9ffff641928562da1622d2ca5993",
   "reflex/components/radix/themes/components/alert_dialog.pyi": "8e1dde62450296310a116ed066bd51e3",
   "reflex/components/radix/themes/components/aspect_ratio.pyi": "1845813a034adfc1f5db8e0f6ffc1118",

reflex/components/radix/themes/color_mode.py

@@ -205,5 +205,5 @@ class ColorModeNamespace(Var):
 color_mode = color_mode_var_and_namespace = ColorModeNamespace(
     _js_expr=color_mode._js_expr,
     _var_type=color_mode._var_type,
-    _var_data=color_mode._get_default_value(),
+    _var_data=color_mode._get_all_var_data(),
 )

reflex/vars/base.py

@@ -483,7 +483,21 @@ class Var(Generic[VAR_TYPE]):
             _var_subclasses.append(VarSubclassEntry(cls, ToVarOperation, python_types))
 
     def __post_init__(self):
-        """Post-initialize the var."""
+        """Post-initialize the var.
+
+        Raises:
+            TypeError: If _js_expr is not a string.
+        """
+        if not isinstance(self._js_expr, str):
+            raise TypeError(
+                f"Expected _js_expr to be a string, got value {self._js_expr!r} of type {type(self._js_expr).__name__}"
+            )
+
+        if self._var_data is not None and not isinstance(self._var_data, VarData):
+            raise TypeError(
+                f"Expected _var_data to be a VarData, got value {self._var_data!r} of type {type(self._var_data).__name__}"
+            )
+
         # Decode any inline Var markup and apply it to the instance
         _var_data, _js_expr = _decode_var_immutable(self._js_expr)