have the pyi here as well

reflex/utils/pyi_generator.py

@@ -372,6 +372,53 @@ def _extract_class_props_as_ast_nodes(
     return kwargs
 
 
+def type_to_ast(typ) -> ast.AST:
+    """Converts any type annotation into its AST representation.
+    Handles nested generic types, unions, etc.
+
+    Args:
+        typ: The type annotation to convert.
+
+    Returns:
+        The AST representation of the type annotation.
+    """
+    if typ is type(None):
+        return ast.Name(id="None")
+
+    origin = get_origin(typ)
+
+    # Handle plain types (int, str, custom classes, etc.)
+    if origin is None:
+        if hasattr(typ, "__name__"):
+            return ast.Name(id=typ.__name__)
+        elif hasattr(typ, "_name"):
+            return ast.Name(id=typ._name)
+        return ast.Name(id=str(typ))
+
+    # Get the base type name (List, Dict, Optional, etc.)
+    base_name = origin._name if hasattr(origin, "_name") else origin.__name__
+
+    # Get type arguments
+    args = get_args(typ)
+
+    # Handle empty type arguments
+    if not args:
+        return ast.Name(id=base_name)
+
+    # Convert all type arguments recursively
+    arg_nodes = [type_to_ast(arg) for arg in args]
+
+    # Special case for single-argument types (like List[T] or Optional[T])
+    if len(arg_nodes) == 1:
+        slice_value = arg_nodes[0]
+    else:
+        slice_value = ast.Tuple(elts=arg_nodes, ctx=ast.Load())
+
+    return ast.Subscript(
+        value=ast.Name(id=base_name), slice=ast.Index(value=slice_value), ctx=ast.Load()
+    )
+
+
 def _get_parent_imports(func):
     _imports = {"reflex.vars": ["Var"]}
     for type_hint in inspect.get_annotations(func).values():
@@ -439,12 +486,24 @@ def _generate_component_create_functiondef(
                 for argument in arguments
             ]
 
-            return ast.Name(
-                id=f"Optional[EventType[{', '.join(
-                    [arg.__name__ for arg in arguments_without_var]
-                )}]]"
+            # Convert each argument type to its AST representation
+            type_args = [type_to_ast(arg) for arg in arguments_without_var]
+
+            # Join the type arguments with commas for EventType
+            args_str = ", ".join(ast.unparse(arg) for arg in type_args)
+
+            # Create EventType using the joined string
+            event_type = ast.Name(id=f"EventType[{args_str}]")
+
+            # Wrap in Optional
+            optional_type = ast.Subscript(
+                value=ast.Name(id="Optional"),
+                slice=ast.Index(value=event_type),
+                ctx=ast.Load(),
             )
 
+            return ast.Name(id=ast.unparse(optional_type))
+
         if isinstance(annotation, str) and annotation.startswith("Tuple["):
             inside_of_tuple = annotation.removeprefix("Tuple[").removesuffix("]")