rn-unmount-animation.js

const useAnimationUnmount = (duration = 300, useNativeDriver = true) => {
  const [animation] = useState(() => new Animated.Value(1));
  const [unmount, setUnmount] = useState(false);

  const start = useCallback(
    () =>
      Animated.timing(animation, {
        toValue: 0,
        useNativeDriver,
        duration,
      }).start(function onFinish() {
        setUnmount(true);
      }),
    []
  );
  return [start, unmount, animation];
};