security.txt + bugfixes

react/shared/hooks/before-unload.js

@@ -0,0 +1,16 @@
+import {useCallback, useEffect} from "react";
+
+export default function useBeforeUnload(modified) {
+
+    const capture = useCallback((event) => {
+        if (modified) {
+            event.preventDefault();
+        }
+    }, [modified]);
+
+    useEffect(() => {
+        window.addEventListener("beforeunload", capture, {capture: true});
+        return () => window.removeEventListener("beforeunload", capture, { capture: true });
+    }, []);
+
+}