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

@@ -0,0 +1,5 @@
+---
+"react-router-dom": major
+---
+
+Proper hydration of `Error` objects from `StaticRouterProvider`

.changeset/shiny-pants-decide.md

@@ -0,0 +1,6 @@
+---
+"react-router-dom": patch
+"@remix-run/router": patch
+---
+
+Skip initial scroll restoration for SSR apps with hydrationData

.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='??']"]
   }
 }

packages/react-router-dom/__tests__/data-browser-router-test.tsx

@@ -287,14 +287,59 @@ function testDomRouter(
 
       function Boundary() {
         let error = useRouteError();
-        return isRouteErrorResponse(error) ? <h1>Yes!</h1> : <h2>No :(</h2>;
+        return isRouteErrorResponse(error) ? (
+          <pre>{JSON.stringify(error)}</pre>
+        ) : (
+          <p>No :(</p>
+        );
       }
 
       expect(getHtml(container)).toMatchInlineSnapshot(`
         "<div>
-          <h1>
-            Yes!
-          </h1>
+          <pre>
+            {\\"status\\":404,\\"statusText\\":\\"Not Found\\",\\"internal\\":false,\\"data\\":{\\"not\\":\\"found\\"}}
+          </pre>
+        </div>"
+      `);
+    });
+
+    it("deserializes Error instances from the window", async () => {
+      window.__staticRouterHydrationData = {
+        loaderData: {},
+        actionData: null,
+        errors: {
+          "0": {
+            message: "error message",
+            __type: "Error",
+          },
+        },
+      };
+      let { container } = render(
+        <TestDataRouter window={getWindow("/")}>
+          <Route path="/" element={<h1>Nope</h1>} errorElement={<Boundary />} />
+        </TestDataRouter>
+      );
+
+      function Boundary() {
+        let error = useRouteError();
+        return error instanceof Error ? (
+          <>
+            <pre>{error.toString()}</pre>
+            <pre>stack:{error.stack}</pre>
+          </>
+        ) : (
+          <p>No :(</p>
+        );
+      }
+
+      expect(getHtml(container)).toMatchInlineSnapshot(`
+        "<div>
+          <pre>
+            Error: error message
+          </pre>
+          <pre>
+            stack:
+          </pre>
         </div>"
       `);
     });
@@ -1523,6 +1568,157 @@ function testDomRouter(
       `);
     });
 
+    it("allows a button to override the <form method>", async () => {
+      let loaderDefer = createDeferred();
+
+      let { container } = render(
+        <TestDataRouter window={getWindow("/")} hydrationData={{}}>
+          <Route
+            path="/"
+            action={async ({ request }) => {
+              throw new Error("Should not hit this");
+            }}
+            loader={() => loaderDefer.promise}
+            element={<Home />}
+          />
+        </TestDataRouter>
+      );
+
+      function Home() {
+        let data = useLoaderData();
+        let navigation = useNavigation();
+        return (
+          <div>
+            <Form
+              method="post"
+              onSubmit={(e) => {
+                // jsdom doesn't handle submitter so we add it here
+                // See https://github.com/jsdom/jsdom/issues/3117
+                // @ts-expect-error
+                e.nativeEvent.submitter =
+                  e.currentTarget.querySelector("button");
+              }}
+            >
+              <input name="test" value="value" />
+              <button type="submit" formMethod="get">
+                Submit Form
+              </button>
+            </Form>
+            <div id="output">
+              <p>{navigation.state}</p>
+              <p>{data}</p>
+            </div>
+            <Outlet />
+          </div>
+        );
+      }
+
+      expect(getHtml(container.querySelector("#output")))
+        .toMatchInlineSnapshot(`
+        "<div
+          id=\\"output\\"
+        >
+          <p>
+            idle
+          </p>
+          <p />
+        </div>"
+      `);
+
+      fireEvent.click(screen.getByText("Submit Form"));
+      await waitFor(() => screen.getByText("loading"));
+      expect(getHtml(container.querySelector("#output")))
+        .toMatchInlineSnapshot(`
+        "<div
+          id=\\"output\\"
+        >
+          <p>
+            loading
+          </p>
+          <p />
+        </div>"
+      `);
+
+      loaderDefer.resolve("Loader Data");
+      await waitFor(() => screen.getByText("idle"));
+      expect(getHtml(container.querySelector("#output")))
+        .toMatchInlineSnapshot(`
+        "<div
+          id=\\"output\\"
+        >
+          <p>
+            idle
+          </p>
+          <p>
+            Loader Data
+          </p>
+        </div>"
+      `);
+    });
+
+    it("supports uppercase form method attributes", async () => {
+      let loaderDefer = createDeferred();
+      let actionDefer = createDeferred();
+
+      let { container } = render(
+        <TestDataRouter window={getWindow("/")} hydrationData={{}}>
+          <Route
+            path="/"
+            action={async ({ request }) => {
+              let resolvedValue = await actionDefer.promise;
+              let formData = await request.formData();
+              return `${resolvedValue}:${formData.get("test")}`;
+            }}
+            loader={() => loaderDefer.promise}
+            element={<Home />}
+          />
+        </TestDataRouter>
+      );
+
+      function Home() {
+        let data = useLoaderData();
+        let actionData = useActionData();
+        let navigation = useNavigation();
+        return (
+          <div>
+            <Form method="POST">
+              <input name="test" value="value" />
+              <button type="submit">Submit Form</button>
+            </Form>
+            <div id="output">
+              <p>{navigation.state}</p>
+              <p>{data}</p>
+              <p>{actionData}</p>
+            </div>
+            <Outlet />
+          </div>
+        );
+      }
+
+      fireEvent.click(screen.getByText("Submit Form"));
+      await waitFor(() => screen.getByText("submitting"));
+      actionDefer.resolve("Action Data");
+      await waitFor(() => screen.getByText("loading"));
+      loaderDefer.resolve("Loader Data");
+      await waitFor(() => screen.getByText("idle"));
+      expect(getHtml(container.querySelector("#output")))
+        .toMatchInlineSnapshot(`
+        "<div
+          id=\\"output\\"
+        >
+          <p>
+            idle
+          </p>
+          <p>
+            Loader Data
+          </p>
+          <p>
+            Action Data:value
+          </p>
+        </div>"
+      `);
+    });
+
     describe("<Form action>", () => {
       function NoActionComponent() {
         return (

packages/react-router-dom/__tests__/data-static-router-test.tsx

@@ -321,6 +321,50 @@ describe("A <StaticRouterProvider>", () => {
     );
   });
 
+  it("serializes Error instances", async () => {
+    let routes = [
+      {
+        path: "/",
+        loader: () => {
+          throw new Error("oh no");
+        },
+      },
+    ];
+    let { query } = createStaticHandler(routes);
+
+    let context = (await query(
+      new Request("http://localhost/", {
+        signal: new AbortController().signal,
+      })
+    )) as StaticHandlerContext;
+
+    let html = ReactDOMServer.renderToStaticMarkup(
+      <React.StrictMode>
+        <StaticRouterProvider
+          router={createStaticRouter(routes, context)}
+          context={context}
+        />
+      </React.StrictMode>
+    );
+
+    // stack is stripped by default from SSR errors
+    let expectedJsonString = JSON.stringify(
+      JSON.stringify({
+        loaderData: {},
+        actionData: null,
+        errors: {
+          "0": {
+            message: "oh no",
+            __type: "Error",
+          },
+        },
+      })
+    );
+    expect(html).toMatch(
+      `<script>window.__staticRouterHydrationData = JSON.parse(${expectedJsonString});</script>`
+    );
+  });
+
   it("supports a nonce prop", async () => {
     let routes = [
       {
@@ -355,7 +399,10 @@ describe("A <StaticRouterProvider>", () => {
 
     let expectedJsonString = JSON.stringify(
       JSON.stringify({
-        loaderData: {},
+        loaderData: {
+          0: null,
+          "0-0": null,
+        },
         actionData: null,
         errors: null,
       })

packages/react-router-dom/dom.ts

@@ -245,5 +245,5 @@ export function getFormSubmissionInfo(
   let { protocol, host } = window.location;
   let url = new URL(action, `${protocol}//${host}`);
 
-  return { url, method, encType, formData };
+  return { url, method: method.toLowerCase(), encType, formData };
 }