was going through a component in a helpx project, saw CQ.CoreComponents.panelcontainer.v1.AFTER_CHILD_DELETE property at eventlister node under edit:config node? is it predefined value like REFRESH_PAGE?
Its a function that handles an afterChildDelete listener for a container component like carousel. It refreshes the component and navigates to the correct active item in the container component.
Refer to /apps/core/wcm/components/commons/editor/clientlibs/panelcontainer/v1/js/panelContainerActions.js