Updates for Remix on RR 6.4

.changeset/afraid-kiwis-grow.md

@@ -0,0 +1,5 @@
+---
+"react-router-dom": minor
+---
+
+Add `useBeforeUnload()` hook

.changeset/bright-gorillas-pump.md

@@ -0,0 +1,5 @@
+---
+"react-router-dom": patch
+---
+
+Support uppercase `<Form method>` and `useSubmit` method values

.changeset/empty-teachers-tie.md

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+---
+"react-router-dom": major
+---
+
+Proper hydration of `Error` objects from `StaticRouterProvider`

.changeset/itchy-swans-travel.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/router": patch
+---
+
+Fix explicit `replace` on submissions and `PUSH` on submission to new paths

.changeset/small-dots-try.md

@@ -0,0 +1,5 @@
+---
+"react-router-dom": patch
+---
+
+Fix `<button formmethod>` form submission overriddes

docs/hooks/use-before-unload.md

@@ -0,0 +1,32 @@
+---
+title: useBeforeUnload
+new: true
+---
+
+# `useBeforeUnload`
+
+This hook is just a helper around `window.onbeforeunload`. It can be useful to save important application state on the page (to something like the browser's local storage), before the user navigates away from your page. That way if they come back you can restore any stateful information (restore form input values, etc.)
+
+```tsx lines=[1,7-11]
+import { useBeforeUnload } from "react-router-dom";
+
+function SomeForm() {
+  const [state, setState] = React.useState(null);
+
+  // save it off before users navigate away
+  useBeforeUnload(
+    React.useCallback(() => {
+      localStorage.stuff = state;
+    }, [state])
+  );
+
+  // read it in when they return
+  React.useEffect(() => {
+    if (state === null && localStorage.stuff != null) {
+      setState(localStorage.stuff);
+    }
+  }, [state]);
+
+  return <>{/*... */}</>;
+}
+```

package.json

@@ -107,7 +107,7 @@
   },
   "filesize": {
     "packages/router/dist/router.umd.min.js": {
-      "none": "36.5 kB"
+      "none": "37 kB"
     },
     "packages/react-router/dist/react-router.production.min.js": {
       "none": "12.5 kB"
@@ -116,7 +116,7 @@
       "none": "14.5 kB"
     },
     "packages/react-router-dom/dist/react-router-dom.production.min.js": {
-      "none": "10.5 kB"
+      "none": "11 kB"
     },
     "packages/react-router-dom/dist/umd/react-router-dom.production.min.js": {
       "none": "16.5 kB"

packages/react-router-dom/.eslintrc

@@ -7,6 +7,7 @@
     "__DEV__": true
   },
   "rules": {
-    "strict": 0
+    "strict": 0,
+    "no-restricted-syntax": ["error", "LogicalExpression[operator='??']"]
   }
 }