AnimationHandle

A handle that controls when an animation begins receiving frame callbacks.

Created by the animation hooks (useAnimatedValue, useAnimationGroup) and passed to AnimationTrigger.onReady. The AnimationTrigger strategy decides when to call start — either immediately (AnimationTrigger.Immediate) or at a later time (AnimationTrigger.Lazy).

The onStart action is generic: it is not tied to a single AnimatedValue, so it works for both single-value hooks and multi-value transitions.