React useInterval Hook Solves the Classic setInterval Stale Closure Bug

A common React pitfall involves using setInterval inside useEffect with an empty dependency array, causing the interval callback to read stale state and produce incorrect results. The underlying issue is a mismatch between setInterval's imperative, render-agnostic nature and React's closure-based state model. Dan Abramov's 2019 essay proposed a declarative useInterval hook that stores the latest callback in a ref, preventing stale closures without restarting the timer on every render. The @reactuses/core library implements this pattern with added real-world features such as null-based pausing, manual pause and resume controls, an immediate execution option, and StrictMode-safe cleanup. The article walks through the hook's internals and covers practical use cases including dynamic polling intervals and background-tab handling.