
Stale Closures in React: Why Handlers, Effects, and Timers Read Old State
A stale closure happens when a callback remembers values from the render that created it, rather than the values currently on‑screen. Timers, event listeners, subscriptions, and async handlers can all outlive that render. The right fix depends on the flow: use functional state updates, correct dependencies, cancellation, or a ref bridge for long‑lived external callbacks.




















