App: add helper hooks

src/hooks/useUnmount.ts

@@ -0,0 +1,12 @@
+import { useRef, useEffect } from "react";
+
+const useUnmount = (fn: () => any): void => {
+  const fnRef = useRef(fn);
+
+  // update the ref each render so if it change the newest callback will be invoked
+  fnRef.current = fn;
+
+  useEffect(() => () => fnRef.current(), []);
+};
+
+export default useUnmount;