moves frontend decorator into decorators module

src/pydase/utils/decorators.py

@@ -0,0 +1,27 @@
+from collections.abc import Callable
+from typing import Any
+
+from pydase.utils.helpers import function_has_arguments
+
+
+class FunctionDefinitionError(Exception):
+    pass
+
+
+def frontend(func: Callable[..., Any]) -> Callable[..., Any]:
+    """
+    Decorator to mark a DataService method for frontend rendering. Ensures that the
+    method does not contain arguments, as they are not supported for frontend rendering.
+    """
+
+    if function_has_arguments(func):
+        raise FunctionDefinitionError(
+            "The @frontend decorator requires functions without arguments. Function "
+            f"'{func.__name__}' has at least one argument. "
+            "Please remove the argument(s) from this function to use it with the "
+            "@frontend decorator."
+        )
+
+    # Mark the function for frontend display.
+    func._display_in_frontend = True  # type: ignore
+    return func

src/pydase/utils/helpers.py

@@ -209,3 +209,17 @@ def function_has_arguments(func: Callable[..., Any]) -> bool:
     if len(parameters) > 0:
         return True
     return False
+
+
+def render_in_frontend(func: Callable[..., Any]) -> bool:
+    """Determines if the method should be rendered in the frontend.
+
+    It checks if the "@frontend" decorator was used or the method is a coroutine."""
+
+    if inspect.iscoroutinefunction(func):
+        return True
+
+    try:
+        return func._display_in_frontend  # type: ignore
+    except AttributeError:
+        return False

src/pydase/utils/serializer.py

@@ -9,11 +9,11 @@ import pydase.units as u
 from pydase.data_service.abstract_data_service import AbstractDataService
 from pydase.data_service.task_manager import TaskStatus
 from pydase.utils.helpers import (
-    function_has_arguments,
     get_attribute_doc,
     get_component_classes,
     get_data_service_class_reference,
     parse_list_attr_and_index,
+    render_in_frontend,
 )
 
 logger = logging.getLogger(__name__)
@@ -27,43 +27,6 @@ class SerializationValueError(Exception):
     pass
 
 
-class FunctionDefinitionError(Exception):
-    pass
-
-
-def frontend(func: Callable[..., Any]) -> Callable[..., Any]:
-    """
-    Decorator to mark a DataService method for frontend rendering. Ensures that the
-    method does not contain arguments, as they are not supported for frontend rendering.
-    """
-
-    if function_has_arguments(func):
-        raise FunctionDefinitionError(
-            "The @frontend decorator requires functions without arguments. Function "
-            f"'{func.__name__}' has at least one argument. "
-            "Please remove the argument(s) from this function to use it with the "
-            "@frontend decorator."
-        )
-
-    # Mark the function for frontend display.
-    func._display_in_frontend = True  # type: ignore
-    return func
-
-
-def render_in_frontend(func: Callable[..., Any]) -> bool:
-    """Determines if the method should be rendered in the frontend.
-
-    It checks if the "@frontend" decorator was used or the method is a coroutine."""
-
-    if inspect.iscoroutinefunction(func):
-        return True
-
-    try:
-        return func._display_in_frontend  # type: ignore
-    except AttributeError:
-        return False
-
-
 class Serializer:
     @staticmethod
     def serialize_object(obj: Any) -> dict[str, Any]: