React 19 Unleashes useEffectEvent: Finally, Track Your Cart Without useEffect Yelling About Missing Dependencies Every Damn Time

ReactJS has introduced a new hook pattern called useEffectEvent in version 19, aimed at resolving the issue of unnecessary re-rendering caused by dependency arrays. This problem commonly occurs when the Effect is re-run due to changes in the dependency array, even if the values are not relevant to the Effect. The useEffectEvent hook enables access to the latest values of other props or state without triggering the Effect to re-run. In a demonstration, a trackPage function logs the current URL and item count in a cart, showcasing the effectiveness of the new hook. The example code illustrates how the onVisit function, created using useEffectEvent, can track page visits without including the itemCount in the dependency array, thus preventing unnecessary re-renders. This update is significant for ReactJS developers, as it improves the efficiency and performance of their applications, particularly those with complex state management and frequent re-renders, starting with ReactJS 19.