This gist is used in this medium article: When React Native Reanimated nodes get evaluated

MyOpacityComponent.tsx

const MyOpacityComponent = () => {
  const [toggled, setToggled] = useState(false)
  const opacity = useRef<Value<number>>(new Value(0))

  useCode(() => [set(opacity.current, runOpacityTimer())], [])

  return (
    <Animated.View style={{ opacity: opacity.current }}>
      <Text>Hello World</Text>
    </Animated.View>
  )
}