fix(api): expose only meaningful classes

Author: jourdain

trame_iframe/widgets/iframe.py

@@ -1,6 +1,14 @@
+"""IFrame Widgets support both vue2 and vue3 backend.
+"""
+
 from trame_client.widgets.core import AbstractElement
 from .. import module
 
+__all__ = [
+    "IFrame",
+    "Communicator",
+]
+
 
 class HtmlElement(AbstractElement):
     def __init__(self, _elem_name, children=None, **kwargs):