Is there any function looking like unity 's "EditorWindow.OnGUI()" in playcanvas

Is there any function that is automatically called every frame in playcanvas when the editor is editing?just like unity 's “EditorWindow.OnGUI()”;

The Editor is not officially extendable unfortunately. There are a few users that have created a number of extensions and some threads on the forum about how to do so.

do you have any links about those extensions?my friend.