Vue3 Tree dnd events

[smz440]

I used to use jquery easyui.
It supports dnd related events.

To deny the drop, simply return false in onBeforeDrop event.
This is useful when a leaf node is dropped onto another leaf node.
Normally only folder nodes should be accepted.

In my opinion there is no dnd rerlated event in Easyui-Vue3.
How can i prevent dropping to leaf nodes if there are no events on dnd?