Move app/javascript/hooks to app/javascript/mastodon/hooks (#34077)

app/javascript/mastodon/hooks/useTimeout.ts

@@ -0,0 +1,44 @@
+import { useRef, useCallback, useEffect } from 'react';
+
+export const useTimeout = () => {
+  const timeoutRef = useRef<ReturnType<typeof setTimeout>>();
+  const callbackRef = useRef<() => void>();
+
+  const set = useCallback((callback: () => void, delay: number) => {
+    if (timeoutRef.current) {
+      clearTimeout(timeoutRef.current);
+    }
+
+    callbackRef.current = callback;
+    timeoutRef.current = setTimeout(callback, delay);
+  }, []);
+
+  const delay = useCallback((delay: number) => {
+    if (timeoutRef.current) {
+      clearTimeout(timeoutRef.current);
+    }
+
+    if (!callbackRef.current) {
+      return;
+    }
+
+    timeoutRef.current = setTimeout(callbackRef.current, delay);
+  }, []);
+
+  const cancel = useCallback(() => {
+    if (timeoutRef.current) {
+      clearTimeout(timeoutRef.current);
+      timeoutRef.current = undefined;
+      callbackRef.current = undefined;
+    }
+  }, []);
+
+  useEffect(
+    () => () => {
+      cancel();
+    },
+    [cancel],
+  );
+
+  return [set, cancel, delay] as const;
+};