84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
import * as React from "react";
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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 { theme } from "../theme";
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import createEmotionCache from "../createEmotionCache";
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export default class MyDocument extends Document {
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render() {
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return (
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<Html lang="en">
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<Head>
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{/* PWA primary color */}
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<meta name="theme-color" content={theme.palette.primary.main} />
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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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// `getInitialProps` belongs to `_document` (instead of `_app`),
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// it's compatible with static-site generation (SSG).
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MyDocument.getInitialProps = async (ctx) => {
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// Resolution order
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//
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// On the server:
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// 1. app.getInitialProps
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// 2. page.getInitialProps
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// 3. document.getInitialProps
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// 4. app.render
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// 5. page.render
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// 6. document.render
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//
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// On the server with error:
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// 1. document.getInitialProps
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// 2. app.render
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// 3. page.render
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// 4. document.render
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//
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// On the client
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// 1. app.getInitialProps
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// 2. page.getInitialProps
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// 3. app.render
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// 4. page.render
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const originalRenderPage = ctx.renderPage;
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// You can consider sharing the same emotion cache between all the SSR requests to speed up performance.
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// However, be aware that it can have global side effects.
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const cache = createEmotionCache();
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const { extractCriticalToChunks } = createEmotionServer(cache);
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ctx.renderPage = () =>
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originalRenderPage({
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// eslint-disable-next-line react/display-name
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enhanceApp: (App) => (props) => <App emotionCache={cache} {...props} />,
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});
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const initialProps = await Document.getInitialProps(ctx);
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// This is important. It prevents emotion to render invalid HTML.
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// See https://github.com/mui-org/material-ui/issues/26561#issuecomment-855286153
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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 fragment is rendered after the app and page rendering finish.
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styles: [
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...React.Children.toArray(initialProps.styles),
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...emotionStyleTags,
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],
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};
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};
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