新しいページの作成に対応

app/src/app.tsx

@@ -2,6 +2,7 @@ import "./app.css";
 import { createSignal } from "solid-js";
 import Index from "./pages/index";
 import Page from "./pages/page";
+import random from "./helpers/random";
 
 const routes = {
   "/": Index,
@@ -36,7 +37,9 @@ export default () => {
         </h1>
         <a href="/new">📄</a>
       </header>
-      {routes[pathname()] ?? <Page id={Number(pathname().slice(1))} />}
+      {routes[pathname()] ?? (
+        <Page id={Number(pathname().slice(1)) || random()} />
+      )}
     </>
   );
 };

app/src/helpers/random.ts

@@ -0,0 +1,5 @@
+function random(): number {
+  return window.crypto.getRandomValues(new Uint16Array(1))[0]!;
+}
+
+export default random;

app/src/pages/page.tsx

@@ -37,6 +37,7 @@ export default (props: { id: number }) => {
       if (await updatePage(id, content)) {
         unblock();
         refetch();
+        window.history.replaceState({}, "", `/${id}`);
       }
     },
     intervalMs