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import React from 'react'; |
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import type { DocumentContext } from 'next/document'; |
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import Document, { Html, Head, Main, NextScript } from 'next/document'; |
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import createEmotionServer from '@emotion/server/create-instance'; |
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import { ServerStyleSheet } from 'styled-components'; |
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import createEmotionCache from '../utils/createEmotionCache'; |
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export default class MyDocument extends Document { |
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static async getInitialProps(ctx: DocumentContext) { |
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const styledComponentsSheet = new ServerStyleSheet(); |
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const originalRenderPage = ctx.renderPage; |
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const cache = createEmotionCache(); |
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const { extractCriticalToChunks } = createEmotionServer(cache); |
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try { |
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ctx.renderPage = () => |
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originalRenderPage({ |
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enhanceApp: (App: any) => (props: any) => |
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styledComponentsSheet.collectStyles( |
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<App emotionCache={cache} {...props} /> |
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), |
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}); |
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const initialProps = await Document.getInitialProps(ctx); |
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const emotionStyles = extractCriticalToChunks(initialProps.html); |
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const emotionStyleTags = emotionStyles.styles.map((style) => ( |
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<style |
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data-emotion={`${style.key} ${style.ids.join(' ')}`} |
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key={style.key} |
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// eslint-disable-next-line react/no-danger |
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dangerouslySetInnerHTML={{ __html: style.css }} |
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/> |
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)); |
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return { |
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...initialProps, |
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styles: [ |
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...React.Children.toArray(initialProps.styles), |
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styledComponentsSheet.getStyleElement(), |
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...emotionStyleTags, |
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], |
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}; |
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} finally { |
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styledComponentsSheet.seal(); |
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} |
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} |
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render() { |
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return ( |
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<Html> |
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<Head> |
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<link |
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href="https://fonts.googleapis.com/css?family=Open+Sans" |
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rel="stylesheet" |
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/> |
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</Head> |
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<body> |
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<Main /> |
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<NextScript /> |
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</body> |
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</Html> |
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); |
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} |
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} |
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