src/dfcx_scrapi/builders/flows.py [286:302]:
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        self._check_proto_obj_attr_exist()

        # Type error checking
        self._is_type_or_list_of_types(
            transition_routes, TransitionRoute, "transition_routes"
        )

        if not isinstance(transition_routes, list):
            transition_routes = [transition_routes]
        self.proto_obj.transition_routes.extend(transition_routes)

        return self.proto_obj


    def add_event_handler(
        self,
        event_handlers: Union[EventHandler, List[EventHandler]]
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src/dfcx_scrapi/builders/pages.py [355:371]:
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        self._check_proto_obj_attr_exist()

        # Type/Error checking
        self._is_type_or_list_of_types(
            transition_routes, TransitionRoute, "transition_routes"
        )

        if not isinstance(transition_routes, list):
            transition_routes = [transition_routes]
        self.proto_obj.transition_routes.extend(transition_routes)

        return self.proto_obj


    def add_event_handler(
        self,
        event_handlers: Union[EventHandler, List[EventHandler]]
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