When you declaratively add or remove a child element, all Animations call specific hooks during the entering or exiting of the element.
Each time you add a component to an entering animation, the Animations call the following hooks:
onEnter—Called before the animation starts.
onEntering—Called after the animation started.
onEntered—Called when the animation completes.
Each time you remove a component from an existing animation, the Animations call the following hooks:
onExit—Called before the animation starts.
onExiting—Called after the animation started.
onExited—Called when the animation completes.
At this point, the animated child is not available in the DOM. For DOM operations, pass a