Test fixture for MUI issue 41388

.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

.prettierignore

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+# Ignore artifacts:
+build
+coverage
+
+# Ignore all HTML files:
+**/*.html

.prettierrc

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+{
+  "endOfLine": "lf",
+  "printWidth": 80,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "singleQuote": true
+}

README.md

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 # mui-test-fixture-41388
+
 Test Fixture for https://github.com/mui/material-ui/issues/41388
+
+---
+
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+# or
+bun dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

app/ThemeContainer.tsx

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+import { AppRouterCacheProvider } from '@mui/material-nextjs/v14-appRouter';
+import { ThemeProvider } from '@mui/material/styles';
+import CssBaseline from '@mui/material/CssBaseline';
+
+import theme from './theme';
+
+interface ThemeContainerProps {
+  children: React.ReactNode;
+}
+
+const ThemeContainer: React.FC<ThemeContainerProps> = ({ children }) => {
+  return (
+    <AppRouterCacheProvider>
+      <ThemeProvider theme={theme}>
+        {/* CssBaseline kickstart an elegant, consistent, and simple baseline to build upon. */}
+        <CssBaseline />
+        {children}
+      </ThemeProvider>
+    </AppRouterCacheProvider>
+  );
+};
+
+export default ThemeContainer;