482fccb922
### Update
We removed the `<head>` element checking for root layout in #41621. Since we also need `<head>` for preload in the future, and also css-in-js will require that. We're adding back the `head` element checking to make sure user always provide valid root layout including it.
### Issue
An issue was reported [here](https://github.com/mui/material-ui/issues/34905#issuecomment-1331945868) that the Emotion/MUI site was suffering from FOUC.
After an inspection, I noticed that the SSRed HTML didn't contain the inserted styles at all - despite them being inserted through `useServerInsertedHTML`. I managed to debug it down and discovered that their layout was missing `<head></head>` and thus the stream transformer skipped the insertion altogether cause of this check:
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| build | ||
| bundles | ||
| cli | ||
| client | ||
| compat | ||
| compiled | ||
| export | ||
| font | ||
| image-types | ||
| legacy | ||
| lib | ||
| pages | ||
| server | ||
| shared/lib | ||
| telemetry | ||
| trace | ||
| types | ||
| amp.d.ts | ||
| amp.js | ||
| app.d.ts | ||
| app.js | ||
| babel.d.ts | ||
| babel.js | ||
| client.d.ts | ||
| client.js | ||
| config.d.ts | ||
| config.js | ||
| constants.d.ts | ||
| constants.js | ||
| document.d.ts | ||
| document.js | ||
| dynamic.d.ts | ||
| dynamic.js | ||
| error.d.ts | ||
| error.js | ||
| head.d.ts | ||
| head.js | ||
| headers.d.ts | ||
| headers.js | ||
| image.d.ts | ||
| image.js | ||
| index.d.ts | ||
| jest.d.ts | ||
| jest.js | ||
| license.md | ||
| link.d.ts | ||
| link.js | ||
| navigation.d.ts | ||
| navigation.js | ||
| package.json | ||
| README.md | ||
| router.d.ts | ||
| router.js | ||
| script.d.ts | ||
| script.js | ||
| server.d.ts | ||
| server.js | ||
| taskfile-ncc.js | ||
| taskfile-swc.js | ||
| taskfile.js | ||
| tsconfig.json | ||
Next.js
Getting Started
Visit https://nextjs.org/learn to get started with Next.js.
Documentation
Visit https://nextjs.org/docs to view the full documentation.
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Contributing
Please see our contributing.md.
Good First Issues
We have a list of good first issues that contain bugs that have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Authors
- Tim Neutkens (@timneutkens)
- Naoyuki Kanezawa (@nkzawa)
- Guillermo Rauch (@rauchg)
- Arunoda Susiripala (@arunoda)
- Tony Kovanen (@tonykovanen)
- Dan Zajdband (@impronunciable)
Security
If you believe you have found a security vulnerability in Next.js, we encourage you to responsibly disclose this and not open a public issue. We will investigate all legitimate reports. Email security@vercel.com to disclose any security vulnerabilities.