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Emotion extractCritical() with NextJS
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| import React from "react"; | |
| import App from "next/app"; | |
| import Head from "next/head"; | |
| import createCache from '@emotion/cache' | |
| import { CacheProvider } from '@emotion/core' | |
| const cache = createCache() | |
| class MyApp extends App { | |
| render() { | |
| const { Component, pageProps } = this.props; | |
| return ( | |
| <CacheProvider value={cache}> | |
| <Head /> | |
| <Component {...pageProps} /> | |
| </CacheProvider> | |
| ); | |
| } | |
| } | |
| export default MyApp; |
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| import Document, { Html, Head, Main, NextScript } from 'next/document' | |
| import { CacheProvider } from '@emotion/core' | |
| import createEmotionServer from 'create-emotion-server' | |
| import createCache from '@emotion/cache' | |
| class MyDocument extends Document { | |
| static async getInitialProps(ctx) { | |
| const originalRenderPage = ctx.renderPage | |
| const cache = createCache() | |
| const { extractCritical } = createEmotionServer(cache) | |
| // rebuild the renderPage with the provider | |
| ctx.renderPage = () => | |
| originalRenderPage({ | |
| enhanceApp: App => props => <CacheProvider value={cache}><App {...props} /></CacheProvider> | |
| }) | |
| const { html, head } = ctx.renderPage() | |
| let { css, ids } = extractCritical(html); | |
| return { | |
| html, | |
| head, | |
| // styles will automatically be added in the <head/> by next | |
| styles: ( | |
| <> | |
| <style data-emotion-css={ids.join(' ')}>{css}</style> | |
| </> | |
| ) | |
| } | |
| } | |
| render() { | |
| return ( | |
| <Html lang="en-US"> | |
| <Head /> | |
| <body> | |
| <Main /> | |
| <NextScript /> | |
| </body> | |
| </Html> | |
| ) | |
| } | |
| } | |
| export default MyDocument |
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