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[system] Explain why AppRouterCacheProvider #40909

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Feb 20, 2024
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[system] Explain why AppRouterCacheProvider #40909

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14 changes: 14 additions & 0 deletions docs/data/material/integrations/nextjs/nextjs.md
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Expand Up @@ -48,6 +48,13 @@ Inside `app/layout.tsx`, import the `AppRouterCacheProvider` and wrap all elemen
}
```

:::info
The `AppRouterCacheProvider` component is responsible for collecting the CSS generated by MUI System on the server, as Next.js is streaming chunks of the .html page to the client.

While it's not required to use the `AppRouterCacheProvider` component, it's recommended to use it to ensure that the styles are appended to the `<head>` and not rendering in the `<body>`.
See https://github.com/mui/material-ui/issues/26561#issuecomment-855286153 for why it's better.
:::

#### Custom cache (optional)

Use the `options` prop to override the default [cache options](https://emotion.sh/docs/@emotion/cache#options)—for example, the code snippet below shows how to change the CSS key to `css` (the default is `mui`):
Expand Down Expand Up @@ -218,6 +225,13 @@ Then, inside `pages/_app.tsx`, import the `AppCacheProvider` component and rende
}
```

:::info
The `AppCacheProvider` component is responsible for collecting the CSS generated by MUI System on the server, as Next.js is rendering the .html page to the client.

While it's not required to use the `AppCacheProvider` component, it's recommended to use it to ensure that the styles are appended to the `<head>` and not rendering in the `<body>`.
See https://github.com/mui/material-ui/issues/26561#issuecomment-855286153 for why it's better.
:::

#### Custom cache (optional)

To use a custom [Emotion cache](https://emotion.sh/docs/@emotion/cache), pass it to the `emotionCache` property in `_document.tsx`:
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