90 lines
2.4 KiB
TypeScript
90 lines
2.4 KiB
TypeScript
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import createEmotionServer from "@emotion/server/create-instance";
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import { AppType } from "next/app";
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import Document, {
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DocumentContext,
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DocumentProps,
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Head,
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Html,
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Main,
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NextScript,
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} from "next/document";
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import createEmotionCache from "../lib/createEmotionCache";
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import { MyAppProps } from "./_app";
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interface MyDocumentProps extends DocumentProps {
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emotionStyleTags: JSX.Element[];
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}
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export default function MyDocument({ emotionStyleTags }: MyDocumentProps) {
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return (
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<Html lang="en">
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<Head>{emotionStyleTags}</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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// `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: DocumentContext) => {
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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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enhanceApp: (
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App: React.ComponentType<React.ComponentProps<AppType> & MyAppProps>,
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) =>
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function EnhanceApp(props) {
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return <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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// This is important. It prevents Emotion to render invalid HTML.
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// See https://github.com/mui/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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emotionStyleTags,
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};
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};
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