init

app/components/Copyright.tsx

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+import * as React from 'react';
+import Typography from '@mui/material/Typography';
+import MuiLink from '@mui/material/Link';
+
+export default function Copyright() {
+  return (
+    <Typography
+      variant="body2"
+      align="center"
+      sx={{
+        color: 'text.secondary',
+      }}
+    >
+      {'Copyright © '}
+      <MuiLink color="inherit" href="https://mui.com/">
+        Your Website
+      </MuiLink>{' '}
+      {new Date().getFullYear()}.
+    </Typography>
+  );
+}

app/components/ProTip.tsx

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+import * as React from 'react';
+import Link from '@mui/material/Link';
+import SvgIcon, { type SvgIconProps } from '@mui/material/SvgIcon';
+import Typography from '@mui/material/Typography';
+
+function LightBulbIcon(props: SvgIconProps) {
+  return (
+    <SvgIcon {...props}>
+      <path d="M9 21c0 .55.45 1 1 1h4c.55 0 1-.45 1-1v-1H9v1zm3-19C8.14 2 5 5.14 5 9c0 2.38 1.19 4.47 3 5.74V17c0 .55.45 1 1 1h6c.55 0 1-.45 1-1v-2.26c1.81-1.27 3-3.36 3-5.74 0-3.86-3.14-7-7-7zm2.85 11.1l-.85.6V16h-4v-2.3l-.85-.6C7.8 12.16 7 10.63 7 9c0-2.76 2.24-5 5-5s5 2.24 5 5c0 1.63-.8 3.16-2.15 4.1z" />
+    </SvgIcon>
+  );
+}
+
+export default function ProTip() {
+  return (
+    <Typography sx={{ mt: 6, mb: 3, color: 'text.secondary' }}>
+      <LightBulbIcon sx={{ mr: 1, verticalAlign: 'middle' }} />
+      {'Pro tip: See more '}
+      <Link href="https://mui.com/material-ui/getting-started/templates/">templates</Link>
+      {' in the Material UI documentation.'}
+    </Typography>
+  );
+}

app/createCache.ts

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+import createCache from '@emotion/cache';
+
+export default function createEmotionCache(options?: Parameters<typeof createCache>[0]) {
+  const emotionCache = createCache({ key: 'mui', ...options });
+  const prevInsert = emotionCache.insert;
+  emotionCache.insert = (...args) => {
+    // ignore styles that contain layer order (`@layer ...` without `{`)
+    if (!args[1].styles.match(/^@layer\s+[^{]*$/)) {
+      args[1].styles = `@layer mui {${args[1].styles}}`;
+    }
+    return prevInsert(...args);
+  };
+
+  return emotionCache;
+}

app/entry.client.tsx

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+import * as React from 'react';
+import * as ReactDOM from 'react-dom/client';
+import { HydratedRouter } from 'react-router/dom';
+
+React.startTransition(() => {
+  ReactDOM.hydrateRoot(
+    document,
+    <React.StrictMode>
+      <HydratedRouter />
+    </React.StrictMode>,
+  );
+});

app/entry.server.tsx

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+import { Transform } from 'node:stream';
+
+import * as React from 'react';
+import * as ReactDOMServer from 'react-dom/server';
+import type { EntryContext } from 'react-router';
+import { ServerRouter } from 'react-router';
+import { createReadableStreamFromReadable } from '@react-router/node';
+import { isbot } from 'isbot';
+import createEmotionServer from '@emotion/server/create-instance';
+import { CacheProvider } from '@emotion/react';
+import createEmotionCache from './createCache';
+
+export const streamTimeout = 5_000;
+
+export default function handleRequest(
+  request: Request,
+  responseStatusCode: number,
+  responseHeaders: Headers,
+  routerContext: EntryContext,
+) {
+  const cache = createEmotionCache();
+  const { extractCriticalToChunks, constructStyleTagsFromChunks } = createEmotionServer(cache);
+
+  return new Promise((resolve, reject) => {
+    let shellRendered = false;
+    const userAgent = request.headers.get('user-agent');
+
+    // Ensure requests from bots and SPA Mode renders wait for all content to load before responding
+    // https://react.dev/reference/react-dom/server/renderToPipeableStream#waiting-for-all-content-to-load-for-crawlers-and-static-generation
+    const readyOption: keyof ReactDOMServer.RenderToPipeableStreamOptions =
+      (userAgent && isbot(userAgent)) || routerContext.isSpaMode ? 'onAllReady' : 'onShellReady';
+
+    const { pipe, abort } = ReactDOMServer.renderToPipeableStream(
+      <CacheProvider value={cache}>
+        <ServerRouter context={routerContext} url={request.url} />
+      </CacheProvider>,
+      {
+        [readyOption]() {
+          shellRendered = true;
+
+          // Collect the HTML chunks
+          const chunks: Buffer[] = [];
+
+          // Create transform stream to collect HTML and inject styles
+          const transformStream = new Transform({
+            transform(chunk, _encoding, callback) {
+              // Collect chunks, don't pass them through yet
+              chunks.push(chunk);
+              callback();
+            },
+            flush(callback) {
+              // Combine all chunks into HTML string
+              const html = Buffer.concat(chunks).toString();
+
+              // Extract emotion styles from the collected HTML
+              const styles = constructStyleTagsFromChunks(extractCriticalToChunks(html));
+
+              if (styles) {
+                const injectedHtml = html.replace('</head>', `${styles}</head>`);
+                this.push(injectedHtml);
+              } else {
+                this.push(html);
+              }
+
+              callback();
+            },
+          });
+
+          const stream = createReadableStreamFromReadable(transformStream);
+
+          responseHeaders.set('Content-Type', 'text/html');
+
+          resolve(
+            new Response(stream, {
+              headers: responseHeaders,
+              status: responseStatusCode,
+            }),
+          );
+
+          pipe(transformStream);
+        },
+        onShellError(error: unknown) {
+          reject(error);
+        },
+        onError(error: unknown) {
+          responseStatusCode = 500;
+          // Log streaming rendering errors from inside the shell.  Don't log
+          // errors encountered during initial shell rendering since they'll
+          // reject and get logged in handleDocumentRequest.
+          if (shellRendered) {
+            console.error(error);
+          }
+        },
+      },
+    );
+
+    // Abort the rendering stream after the `streamTimeout` so it has time to
+    // flush down the rejected boundaries
+    setTimeout(abort, streamTimeout + 1000);
+  });
+}

app/root.tsx

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+import * as React from 'react';
+import {
+  isRouteErrorResponse,
+  Links,
+  Meta,
+  Outlet,
+  Scripts,
+  ScrollRestoration,
+} from 'react-router';
+import { CacheProvider } from '@emotion/react';
+import Box from '@mui/material/Box';
+import AppTheme from './theme';
+import createEmotionCache from './createCache';
+
+import type { Route } from './+types/root';
+
+export const links: Route.LinksFunction = () => [
+  { rel: 'preconnect', href: 'https://fonts.googleapis.com' },
+  {
+    rel: 'preconnect',
+    href: 'https://fonts.gstatic.com',
+    crossOrigin: 'anonymous',
+  },
+  {
+    rel: 'stylesheet',
+    href: 'https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap',
+  },
+];
+
+export function Layout({ children }: { children: React.ReactNode }) {
+  return (
+    <html lang="en" suppressHydrationWarning>
+      <head>
+        <meta charSet="utf-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <Meta />
+        <Links />
+      </head>
+      <body>
+        {children}
+        <ScrollRestoration />
+        <Scripts />
+      </body>
+    </html>
+  );
+}
+
+const cache = createEmotionCache();
+
+export default function App() {
+  if (typeof window !== 'undefined') {
+    return (
+      <CacheProvider value={cache}>
+        <AppTheme>
+          <Outlet />
+        </AppTheme>
+      </CacheProvider>
+    );
+  }
+  return (
+    <AppTheme>
+      <Outlet />
+    </AppTheme>
+  );
+}
+
+export function ErrorBoundary({ error }: Route.ErrorBoundaryProps) {
+  let message = 'Oops!';
+  let details = 'An unexpected error occurred.';
+  let stack: string | undefined;
+
+  if (isRouteErrorResponse(error)) {
+    message = error.status === 404 ? '404' : 'Error';
+    details =
+      error.status === 404 ? 'The requested page could not be found.' : error.statusText || details;
+  } else if (import.meta.env.DEV && error && error instanceof Error) {
+    details = error.message;
+    stack = error.stack;
+  }
+
+  return (
+    <Box component="main" sx={{ pt: 8, p: 2, maxWidth: 'lg', mx: 'auto' }}>
+      <h1>{message}</h1>
+      <p>{details}</p>
+      {stack && (
+        <Box component="pre" sx={{ width: '100%', p: 2, overflowX: 'auto' }}>
+          <code>{stack}</code>
+        </Box>
+      )}
+    </Box>
+  );
+}

app/routes.ts

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+import { type RouteConfig, index, route } from '@react-router/dev/routes';
+
+export default [
+  index('routes/home.tsx'),
+  route('/about', 'routes/about.tsx'),
+] satisfies RouteConfig;

app/routes/about.tsx

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+import * as React from 'react';
+import Container from '@mui/material/Container';
+import Typography from '@mui/material/Typography';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import { Link as ReactRouterLink } from 'react-router';
+import ProTip from '~/components/ProTip';
+import Copyright from '~/components/Copyright';
+
+export function meta() {
+  return [
+    { title: 'About' },
+    {
+      name: 'description',
+      content: 'About the project',
+    },
+  ];
+}
+
+export default function About() {
+  return (
+    <Container maxWidth="lg">
+      <Box
+        sx={{
+          my: 4,
+          display: 'flex',
+          flexDirection: 'column',
+          justifyContent: 'center',
+          alignItems: 'center',
+        }}
+      >
+        <Typography variant="h4" component="h1" sx={{ mb: 2 }}>
+          Material UI - Next.js example in TypeScript
+        </Typography>
+        <Box sx={{ maxWidth: 'sm' }}>
+          <Button variant="contained" component={ReactRouterLink} to="/">
+            Go to the home page
+          </Button>
+        </Box>
+        <ProTip />
+        <Copyright />
+      </Box>
+    </Container>
+  );
+}

app/routes/home.tsx

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+import * as React from 'react';
+import Container from '@mui/material/Container';
+import Typography from '@mui/material/Typography';
+import Box from '@mui/material/Box';
+import Link from '@mui/material/Link';
+import { Link as ReactRouterLink } from 'react-router';
+import ProTip from '~/components/ProTip';
+import Copyright from '~/components/Copyright';
+
+export function meta() {
+  return [
+    { title: 'Material UI - React Router example in TypeScript' },
+    {
+      name: 'description',
+      content: 'Welcome to Material UI - React Router example in TypeScript!',
+    },
+  ];
+}
+
+export default function Home() {
+  return (
+    <Container maxWidth="lg">
+      <Box
+        sx={{
+          my: 4,
+          display: 'flex',
+          flexDirection: 'column',
+          justifyContent: 'center',
+          alignItems: 'center',
+        }}
+      >
+        <Typography variant="h4" component="h1" sx={{ mb: 2 }}>
+          Material UI - Next.js App Router example in TypeScript
+        </Typography>
+        <Link to="/about" color="secondary" component={ReactRouterLink}>
+          Go to the about page
+        </Link>
+        <ProTip />
+        <Copyright />
+      </Box>
+    </Container>
+  );
+}

app/theme.tsx

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+import * as React from 'react';
+import { createTheme, ThemeProvider } from '@mui/material/styles';
+import CssBaseline from '@mui/material/CssBaseline';
+
+const theme = createTheme({
+  cssVariables: true,
+  colorSchemes: {
+    light: true,
+    dark: true,
+  },
+});
+
+interface AppThemeProps {
+  children: React.ReactNode;
+}
+
+export default function AppTheme({ children }: AppThemeProps) {
+  return (
+    <ThemeProvider theme={theme}>
+      <CssBaseline />
+      {children}
+    </ThemeProvider>
+  );
+}