import * as React from "react";
import Document, { Html, Head, Main, NextScript } from "next/document";
import createEmotionServer from "@emotion/server/create-instance";
import theme from "../src/theme";
import createEmotionCache from "../src/createEmotionCache";
export default class MyDocument extends Document {
render() {
return (
{/* PWA primary color */}
{/* Inject MUI styles first to match with the prepend: true configuration. */}
{(this.props as any).emotionStyleTags}
);
}
}
// `getInitialProps` belongs to `_document` (instead of `_app`),
// it's compatible with static-site generation (SSG).
MyDocument.getInitialProps = async (ctx) => {
const originalRenderPage = ctx.renderPage;
// You can consider sharing the same emotion cache between
// all the SSR requests to speed up performance.
// However, be aware that it can have global side effects.
const cache = createEmotionCache();
const { extractCriticalToChunks } = createEmotionServer(cache);
ctx.renderPage = () =>
originalRenderPage({
enhanceApp: (App: any) =>
function EnhanceApp(props) {
return ;
},
});
const initialProps = await Document.getInitialProps(ctx);
// This is important. It prevents emotion to render invalid HTML.
// See
// https://github.com/mui-org/material-ui/issues/26561#issuecomment-855286153
const emotionStyles = extractCriticalToChunks(initialProps.html);
const emotionStyleTags = emotionStyles.styles.map((style) => (
));
return {
...initialProps,
emotionStyleTags,
};
};