vmarcosp/_document.js

## _document.js
import React from "react";
import createEmotionServer from "@emotion/server/create-instance";
import NextDocument, { Html, Main, Head, NextScript } from "next/document";
import { cache } from "@emotion/css";

class Document extends NextDocument {
  static async getInitialProps(ctx) {
    const page = await ctx.renderPage();
    const initialProps = await NextDocument.getInitialProps(ctx);
    const { css, ids } = renderStatic(page.html);

    return {
      ...initialProps,
      styles: (
        <>
          {initialProps.styles}
          <style
            data-emotion={`css ${ids.join(" ")}`}
            dangerouslySetInnerHTML={{ __html: css }}
          />
        </>
      ),
    };
  }

  render() {
    return (
      <Html lang="pt-br">
				<Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}

export const renderStatic = (html) => {
  if (html === undefined) {
    throw new Error("did you forget to return html from renderToString?");
  }
  const { extractCritical } = createEmotionServer(cache);
  const { ids, css } = extractCritical(html);

  return { html, ids, css };
};

export default Document;
	import React from "react";
	import createEmotionServer from "@emotion/server/create-instance";
	import NextDocument, { Html, Main, Head, NextScript } from "next/document";
	import { cache } from "@emotion/css";

	class Document extends NextDocument {
	static async getInitialProps(ctx) {
	const page = await ctx.renderPage();
	const initialProps = await NextDocument.getInitialProps(ctx);
	const { css, ids } = renderStatic(page.html);

	return {
	...initialProps,
	styles: (
	<>
	{initialProps.styles}
	<style
	data-emotion={`css ${ids.join(" ")}`}
	dangerouslySetInnerHTML={{ __html: css }}
	/>
	</>
	),
	};
	}

	render() {
	return (
	<Html lang="pt-br">
	<Head />
	<body>
	<Main />
	<NextScript />
	</body>
	</Html>
	);
	}
	}

	export const renderStatic = (html) => {
	if (html === undefined) {
	throw new Error("did you forget to return html from renderToString?");
	}
	const { extractCritical } = createEmotionServer(cache);
	const { ids, css } = extractCritical(html);

	return { html, ids, css };
	};

	export default Document;