fail on using rxcond on event handlers or event spec

Author: adhami3310

reflex/event.py

@@ -14,6 +14,7 @@
     Annotated,
     Any,
     Generic,
+    NoReturn,
     Protocol,
     TypedDict,
     TypeVar,
@@ -1683,6 +1684,16 @@ def get_fn_signature(fn: Callable) -> inspect.Signature:
 class EventVar(ObjectVar, python_types=(EventSpec, EventHandler)):
     """Base class for event vars."""
 
+    def bool(self) -> NoReturn:
+        """Get the boolean value of the var.
+
+        Raises:
+            TypeError: EventVar cannot be converted to a boolean.
+        """
+        raise TypeError(
+            f"Cannot convert {self._js_expr} of type {type(self).__name__} to bool."
+        )
+
 
 @dataclasses.dataclass(
     eq=False,
@@ -1759,6 +1770,16 @@ def no_args():
 class EventChainVar(BuilderFunctionVar, python_types=EventChain):
     """Base class for event chain vars."""
 
+    def bool(self) -> NoReturn:
+        """Get the boolean value of the var.
+
+        Raises:
+            TypeError: EventChainVar cannot be converted to a boolean.
+        """
+        raise TypeError(
+            f"Cannot convert {self._js_expr} of type {type(self).__name__} to bool."
+        )
+
 
 @dataclasses.dataclass(
     eq=False,