I believe you're confusing react-native-reanimated (https://github.com/software-mansion/react-native-reanimated) with the Animated API from React Native. react-native-reanimated allows JS code to run on a UI thread that is able to synchronously modify layout, providing alternative synchronous ways for you to hook into the layouting. For instance, as opposed to the asynchronous `measure()` method provided by React Native to measure layouts, react-native-reanimated allows one to call their version of `measure()` (https://docs.swmansion.com/react-native-reanimated/docs/api/...) to perform the same operation on the UI thread, synchronously.