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docs: add section for FOUC bug in next js 13 #971

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bcd9bc1
docs: add section for FOUC bug in next js
bunmi-oye Jun 11, 2024
45abf21
MOVE: FOUC fix notes to SSR section
bunmi-oye Jul 4, 2024
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3 changes: 3 additions & 0 deletions pages/docs.json
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,9 @@
{
"title": "How do I use styled-components with create-react-app?"
},
{
"title": "Why do I see a flash of unstyled content (FOUC) in my Next.js 13 app?"
},
{
"title": "How can I fix issues when using npm link or yarn link?"
},
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2 changes: 2 additions & 0 deletions pages/docs/faqs.mdx
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Expand Up @@ -13,6 +13,7 @@ import MigrationV4 from '../../sections/faqs/migration-v4.mdx'
import MigrationV5 from '../../sections/faqs/migration-v5.mdx'
import MigrationV6 from '../../sections/faqs/migration-v6.mdx'
import CRA from '../../sections/faqs/create-react-app.mdx'
import NextJs13 from '../../sections/faqs/nextjs-13-issues.mdx'
import NPMLink from '../../sections/faqs/npm-link.mdx'
import FlickeringText from '../../sections/faqs/flickering-text.mdx'
import DeclareComponentsInRenderMethod from '../../sections/faqs/declare-components-in-render-method.mdx'
Expand All @@ -39,6 +40,7 @@ export default ({ children }) => (
<HTMLAttributeWarnings />
<BrowserSupport />
<CRA />
<NextJs13 />
<NPMLink />
<FlickeringText />
<MissingNativeImport />
73 changes: 73 additions & 0 deletions sections/faqs/nextjs-13-issues.mdx
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@@ -0,0 +1,73 @@
## Why do I see a flash of unstyled content (FOUC) in my Next.js 13 app?

When using Next.js 13 with styled-components, you may experience a flash of unstyled content (FOUC) due to "delay bugs" in client-side rendering. This happens because styled-components' styles are not immediately applied when the page is rendered, causing unstyled elements to appear for a split second.

To resolve this issue, follow these steps:

1. Add the following to your next.config.js file.

```js
/** @type {import('next').NextConfig} */
const nextConfig = {
reactStrictMode: true,
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Strict mode required?

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That's there because I copy-pasted the solution from #927. I can delete it if unnecessary.

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Also, let me know if I should take out strict mode

compiler: {
styledComponents: true,
},
}

module.exports = nextConfig
```
2. Create the registry.tsx file with the following code:
```tsx
'use client'

import React, { useState } from 'react';
import { useServerInsertedHTML } from 'next/navigation';
import { ServerStyleSheet, StyleSheetManager } from 'styled-components';

export default function StyledComponentsRegistry({
children,
}: {
children: React.ReactNode
}) {
// Only create stylesheet once with lazy initial state
// x-ref: https://reactjs.org/docs/hooks-reference.html#lazy-initial-state
const [styledComponentsStyleSheet] = useState(() => new ServerStyleSheet())

useServerInsertedHTML(() => {
const styles = styledComponentsStyleSheet.getStyleElement()
styledComponentsStyleSheet.instance.clearTag()
return styles
})

if (typeof window !== 'undefined') return <>{children}</>

return (
<StyleSheetManager sheet={styledComponentsStyleSheet.instance}>
{children}
</StyleSheetManager>
)
};
```

3. Add the ```'use client'``` directive to your layout.tsx file and wrap all the children components on your layout with the StyledComponentsRegistry component.
```tsx
'use client'
import StyledComponentsRegistry from './registry';

export default function RootLayout({
children,
}: {
children: React.ReactNode
}) {
return (
<html lang="en">
<StyledComponentsRegistry>
<body>
{children}
</body>
</StyledComponentsRegistry>
</html>
)
};
```